summaryrefslogtreecommitdiffstats
path: root/loader/linuxrc.s390
blob: d9ccca67161ee07b679e3c7e6c03b0f6a218d871 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
#! /bin/bash

# linuxrc.s390: init process of Red Hat's installer initrd for s390(x)
# Copyright (C) 2000-2004 by
#        Bernhard Rosenkraenzer <bero@redhat.com>
#        Oliver Paukstadt <opaukstadt@millenux.com>
#        Karsten Hopp <karsten@redhat.de>
#        Florian La Roche <laroche@redhat.com>
#        Nils Philippsen <nils@redhat.de>
#        Helge Deller <hdeller@redhat.de>
#        David Sainty <dsainty@redhat.com>
# Copyright (C) IBM Corp. 2008,2009
#        Author: Steffen Maier <maier@de.ibm.com>
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program; if not, write to the Free Software
#    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

# prerequisites of this script to run inside the RHEL5.3 installer initrd:
# - copy udevsettle and udevd to initrd
# - copy lsznet.raw to initrd as /sbin/lsznet
# - create /etc/udev/udev.conf with at least one comment line as content

VERSION=1.2

export TEXTDOMAIN=s390installer
export TEXTDOMAINDIR=/usr/lib/locale

# helper function to execute command in arguments and print command on stdout
function debug() {
    # uncomment the following echo "$*" to enable debug output
    #echo "$*"
    $*
}

# FIXME: maybe change to "$$" for production use, in case it wouldn't be init
declare -r INITPID="1"

unset testing
[ "$$" != "$INITPID" ] && testing="1"
# uncomment the following test="1" to never execute sensitive commands
#testing="1"

# helper function to disable commands while running outside the initrd
function tv() {
    if [ -z "$testing" ]; then
        $*
    else
        return 0
    fi
}

function checkipv6()
{
    local ip=$1
    [ -z "$ip" ] && return 1
    /sbin/ipcalc -c -6 "$ip" >/dev/null 2>&1
    return $?
}

function checkipv4()
{
    local ip=$1
    [ -z "$ip" ] && return 1
    /sbin/ipcalc -c -4 "$ip" >/dev/null 2>&1
    return $?
}

function doshutdown()
{
    exec /sbin/shutdown
    exit 0
}

function doreboot()
{
    # find out the location of /boot and use it to re-ipl
    boot="$(cat /proc/mounts | grep " /mnt/sysimage/boot " | awk -F" " '{print $1}')"
    if [ -z $boot ]; then
        # use root if /boot not used
        boot="$(cat /proc/mounts | grep " /mnt/sysimage " | awk -F" " '{print $1}')"
    fi

    # lookup dasd disk
    echo $boot | grep "dasd" > /dev/null
    if [ $? -eq 0 ]; then
        type="ccw"
        boot="$(basename $boot)"
        # strip partition number from dasd device
        boot="$(echo ${boot%[0-9]})"
        id="$(basename $(readlink /sys/block/$boot/device))"
        echo $type > /sys/firmware/reipl/reipl_type
        echo $id > /sys/firmware/reipl/$type/device
    else
        # scsi re-ipl only supported on newer machines
        doshutdown
        exit 0
    fi

    echo $"about to exec shutdown -r"
    exec /sbin/shutdown -r
    exit 0
}

function sysecho () {
    file=$1
    shift
    local i=1
    while [ $i -le 10 ] ; do
        if [ ! -f "$file" ]; then
            sleep 1
            i=$((i+1))
        else
            break
        fi
    done
    [ -f "$file" ] && echo $* > $file
}

function startinetd()
{
    echo
    echo $"Starting telnetd and sshd to allow login over the network."
    if [ -z "$testing" ]; then
        echo $"Welcome to the anaconda install environment $VERSION for $S390ARCH" > /etc/issue.net
        echo $"Welcome to the anaconda install environment $VERSION for $S390ARCH" > /etc/motd
        echo >> /etc/motd
    fi # testing

    /sbin/xinetd -stayalive -reuse -pidfile /tmp/xinetd.pid
    /sbin/sshd
    if [ -z "$RUNKS" ]; then
        echo
        echo $"Connect now to $IPADDR and login as user root to start the installation."
        echo $"E.g. using: ssh -X root@$IPADDR"
        read
        while : ; do
            /bin/sh --login
            [ $? = 0 ] || break
        done
    fi
}

# read file from CMS and write it to /tmp
function readcmsfile() # $1=dasdport $2=filename
{
    local dev
    if [ $# -ne 2 ]; then return; fi
    mknod /dev/dasda b 94 0
    if ! sysecho /proc/cio_ignore "free $1"; then
        echo $"DASD $1 could not be cleared from device blacklist"
        return 1
    fi
    # /proc/cio_ignore won't block on freeing devices until resensing
    # has been completed, so wait until the udev event queue depletes
    # (without udevsettle we could wait 2 seconds unconditionally)
    #debug ls -laF /dev/.udev
    udevsettle
    sleep 1
    insmod dasd_mod$LO dasd=$1
    insmod dasd_eckd_mod$LO
    if ! cmsfscat -d /dev/dasda -a $2 > /tmp/$2; then
        echo $"Could not read conf file $2 on CMS DASD $1."
    fi
    # maybe replace with a more robust: dev=$(printf "0.0.%04x" $((0x${1})))
    if [ ${#1} == 3 ]; then
        dev="0.0.0${1}"
    elif [ ${#1} == 4 ]; then
        dev="0.0.${1}"
    fi
    sysecho /sys/bus/ccw/drivers/dasd-eckd/$dev/online 0
    rmmod dasd_eckd_mod
    rmmod dasd_mod
}

function createDevices()
{
    awk '{ printf("mknod /dev/%s %s %s %s\n", $1, $2, $3, $4);
      printf("chmod %s /dev/%s\n", $5, $1);
      printf("chown %s /dev/%s\n", $6, $1);
    }' <<EOF | sh
console c 5 1 600 root:root
null c 1 3 666 root:root
zero c 1 5 666 root:root
mem c 1 1 600 root:root
ptmx c 5 2 666 root:root
tty  c 5 0 666 root:root
tty0 c 4 0 600 root:tty
tty1 c 4 1 600 root:tty
random c 1 8 644 root:root
urandom c 1 9 644 root:root
rtc c 10 135 644 root:root
EOF
    for i in 2 3 4 5 6 7 8 9 ; do
        ln -s console /dev/tty$i
    done
    mkdir /dev/pts
    ln -s /proc/self/fd /dev/fd
}

# from here on accesses to sysfs try to follow
# linux/Documentation/sysfs-rules.txt

### lsznet.raw integration

declare -a nettable

function read_lsznet_output() {
    #local lsznet_output=/tmp/lsznet.raw
    #lsznet.raw > $lsznet_output
    count=0
    local line
    while read line; do
        nettable[$count]="$line"
        count=$((count + 1))
    #done < $lsznet_output
    #rm -f $lsznet_output
    # using the more sophisticated process substitution instead of temp file
    # requires the symlink /dev/fd -> /proc/self/fd => createDevices
    done < <(lsznet)
}

function print_nettable() {
    local fmtstring="%3s %-14s %-7s %-5s %-4s %-6s %-7s %s\n"
    printf "$fmtstring" \
        "NUM" "CARD" "CU" "CHPID" "TYPE" "DRIVER" "IF" "DEVICES"
    local i
    for ((i=0; i < count; i++)); do
        local item cutype chp chpidtype devdrv devname chlist cardtype
        read item cutype chp chpidtype devdrv devname chlist cardtype <<< ${nettable[$i]}
        printf "$fmtstring" \
            $item "$cardtype" $cutype $chp "$chpidtype" $devdrv $devname $chlist
    done
}

function clear_screen() {
    # FIXME: find a way to clear screen despite 3215 line mode terminal
    echo
}

function dialog_network_table() {
    while : ; do
        echo $"Scanning for available network devices..."
        # This may take a long time so we show "progress":
        #( while true; do echo -n "."; sleep 1; done ) &
        #local childpid=$!
        read_lsznet_output
        #kill $childpid
        #echo
        echo $"Autodetection found ${count} devices."
        # count==0: there might still be a blacklist the user wants to clear.
        # do not flood user with long list if there are many devices
        if [ "$count" -le 15 ]; then
            # Show list
            answer=s
        else # [ $count -gt 15 ]
            echo
            while : ; do
                echo $"s) show all, m) manual config:"
                local answer
                read answer
                case $answer in
                    s|m) break ;;
                esac
            done
        fi
        [ "$answer" = "m" ] && break
        # show network table to select network hardware configuration from
        if [ "$count" -gt 0 ]; then
            clear_screen
            print_nettable
            echo
        fi
        # account for possibly ignored common I/O devices
        # cio_wc_bytes is NOT local so it can be re-used outside this function
        cio_wc_bytes=0
        local cio_wc_filename cio_wc_foo
        if [ -f /proc/cio_ignore ]; then
            local cio_wc=$(wc -c /proc/cio_ignore)
            read cio_wc_bytes cio_wc_filename cio_wc_foo <<< "$cio_wc"
            if [ "$cio_wc_bytes" != "0" ]; then
                echo $"Note: There is a device blacklist active! (Clearing might take long)"
                #cat /proc/cio_ignore | tr '\n' ','
                #echo
            else
                if [ "$count" -eq 0 ]; then
                    # count==0 AND no device blacklist => manual mode
                    echo $"Entering manual configuration mode."
                    break
                fi
            fi
        fi
        # selection dialog
        while : ; do
            [ "$count" -gt 0 ] && echo -n $"<num>) use config, "
            [ "$cio_wc_bytes" != "0" ] && echo -n $"c) clear blacklist, "
            echo $"m) manual config, r) rescan, s) shell:"
            local choice
            read choice
            [ -z "$choice" ] && continue
            if [ "$choice" = "s" ]; then
                echo $"Enter 'exit' at the shell prompt to get back to the installation dialog."
                /bin/bash
                continue 2
            fi
            [ "$choice" = "m" ] && break
            [ "$choice" = "r" ] && continue 2
            [ "$cio_wc_bytes" != "0" -a "$choice" = "c" ] && break
            [[ "$choice" =~ ^[[:digit:]]+$ ]]
            case $? in
                0)
                    # string matched the pattern
                    [ "$choice" -ge 1 -a "$choice" -le "$count"  ] && break
                    ;;
                1)
                    # string did not match the pattern
                    continue
                    ;;
                2)
                    echo "l.$LINENO: syntax error in regex of match operator =~, code needs to be fixed" 1>&2
                    ;;
                *)
                    echo "l.$LINENO: unexpected return code of regex match operator =~, code needs to be fixed" 1>&2
                    ;;
            esac
        done
        if [ "$choice" = "c" ]; then
            echo $"Clearing device blacklist..."
            if sysecho /proc/cio_ignore "free all"; then
                cio_wc_bytes=0
                # /proc/cio_ignore won't block on freeing devices
                # until resensing has been completed, so wait until
                # the udev event queue depletes.
                # This may take a long time so we show "progress":
                #( while true; do echo -n "."; sleep 3; done ) &
                #local childpid=$!
                #debug ls -laF /dev/.udev
                udevsettle
                # (virtual) CTC/A takes some more time to appear in sysfs
                # FIXME: how long to wait? 3 seconds seems to be enough.
                sleep 3
                #kill $childpid
                #echo
                # udevsettle only works if udevd is running (/dev/.udev/queue)!
                # (without udevsettle we could wait 5-10 seconds uncond.)
                continue
            else
                echo $"Device blacklist could not be cleared"
            fi
        fi
        [ "$choice" = "m" ] && break
        # finally extract config info from selected item
        # array nettable starts at index zero, user input starts at index one
        choice=$((choice - 1))
        local item cutype chp chpidtype devdrv devname chlist cardtype
        read item cutype chp chpidtype devdrv devname chlist cardtype <<< ${nettable[$choice]}
        # $NETTYPE happens to be exactly the network driver name
        NETTYPE=$devdrv
        SUBCHANNELS=$chlist
        break
    done
    echo
}

declare -r PREFIXFORMAT=[[:xdigit:]]*
declare -r SSIDFORMAT=[0-3]
declare -r BUSIDFORMAT=[[:xdigit:]][[:xdigit:]][[:xdigit:]][[:xdigit:]]
declare -r IDFORMAT=$PREFIXFORMAT.$SSIDFORMAT.$BUSIDFORMAT
declare -r SUBCHANNEL_TYPE_IO=0

# The following combinations of control unit type and model were taken from the
# Linux network device drivers for s390 on 2008-06-09 from Linux 2.6.25.4.
# The list (among other things) should be adapted, if any of those device
# drivers start supporting different CU types/models.
# (Alternatively, the list could be generated by reading the modaliases
#  directly out of the device driver modules:
#  modinfo qeth/cu3088 | fgrep 'alias:'
#  However, this would still require a list of device driver modules.)

declare -r -a CU=(
    1731/01
    1731/05
    3088/08
    3088/1f
    3088/1e
    3088/01
    3088/60
)

declare -r -a CU_DEVDRV=(
    qeth
    qeth
    ctc
    ctc
    ctc
    lcs
    lcs
)

# Searches for a match of argument 1 on the array $CU and sets $cu_idx
# to the matched array index on success.
# Returns 0 on success, 1 on failure.
function search_cu() {
    local scu=$1
    local i
    for ((i=0; i < ${#CU[@]}; i++)); do
        if [ "$scu" == "${CU[i]}" ]; then
            cu_idx=$i
            return 0
        fi
    done
    return 1
}

function cardtype2cleartext() {
    local cardtype=$1
    case $cardtype in
        OSD_10GIG)        echo "OSA card in OSD mode, 10 Gigabit Ethernet" ;;
        OSD_1000)         echo "OSA card in OSD mode, Gigabit Ethernet" ;;
        OSD_100)          echo "OSA card in OSD mode, Fast Ethernet" ;;
        OSD_GbE_LANE)     echo "OSA card in OSD mode, Gigabit Ethernet, LAN Emulation" ;;
        OSD_FE_LANE)      echo "OSA card in OSD mode, Fast Ethernet, LAN Emulation" ;;
        OSD_TR_LANE)      echo "OSA card in OSD mode, Token Ring, LAN Emulation" ;;
        OSD_ATM_LANE)     echo "OSA card in OSD mode, ATM, LAN Emulation" ;;
        OSD_Express)      echo "OSA card in OSD mode, unknown link type" ;;
        HSTR)             echo "OSA card in OSD mode, High Speed Token Ring" ;;
        OSN)              echo "OSA for NCP, ESCON/CDLC bridge" ;;
        HiperSockets)     echo "HiperSocket with CHPID type IQD" ;;
        "GuestLAN QDIO")  echo "GuestLAN based on OSA (QDIO)" ;;
        "GuestLAN Hiper") echo "GuestLAN based on HiperSocket" ;;
        unknown)          echo "other" ;;
        *) echo "unknown"
            echo "l.$LINENO: found unknown card_type, code needs to be fixed" 1>&2
            ;;
    esac
}

# returns true iff running under z/VM
function isVM() {
    local cpu_version=$(cat /proc/cpuinfo |grep "^processor " | head -n1 | sed 's/.*version = \([[:xdigit:]][[:xdigit:]]\).*/\1/' | tr '[:lower:]' '[:upper:]')
    if [ "$cpu_version" = "FF" ]; then
        return 0
    else
        return 1
    fi
}

# echos one comparable integer built from 3 arguments in kernel version style
function kernel_version() {
    [ $# -eq 3 ] || return 1
    local krn_ver=$1 krn_patch=$2 krn_sub=$3
    local version=$(( (krn_ver << 16) + (krn_patch << 8) + krn_sub ))
    # <<EOF convince syntax highlighter that above shifts are no here documents
    echo $version
    return 0
}

# echos one comparable integer built from actual running kernel version
function linux_version() {
    local krn_ver krn_patch krn_sub
    local krn_foo krn_extra
    IFS=.
    read krn_ver krn_patch krn_foo < <(uname -r)
    unset IFS
    IFS=-
    read krn_sub krn_extra <<< "$krn_foo"
    unset IFS
    kernel_version $krn_ver $krn_patch $krn_sub
}

# watch out: potential error message as side effect
function isLayer2Default() {
    # Read default from sysfs because according to device
    # drivers book there are differences in the default between
    # OSA (l2), hipersockets (l3).
    # This only works here in installer where nobody has overwritten
    # the default setting with another custom value already!
    if [ ! -f /sys/devices/${NETTYPE}/$SCH_R_DEVBUSID/layer2 ]; then
        echo $"Could not read layer mode from sysfs"
        return 1
    fi
    local layer2
    read layer2 < /sys/devices/${NETTYPE}/$SCH_R_DEVBUSID/layer2
    if [ "$layer2" = "1" ]; then
        return 0
    else
        return 1
    fi
}

# returns true iff either LAYER2 has been set to 1 or is the default
# watch out: potential error message as side effect
function isLayer2() {
    case "x$LAYER2" in
        x0) return 1 ;; # layer 3
        x1) return 0 ;; # layer 2
        x)  # LAYER2 is unset or empty => qeth driver default applies.
            isLayer2Default
            return $?
            ;;
        *) echo "l.$LINENO: unknown value \"$LAYER2\" for LAYER2, code needs to be fixed" 1>&2
            return 2 ;;
    esac
}

# returns true iff qeth device $SCH_R_DEVBUSID and kernel version
# is capable of supporting IPv6
# watch out: potential error message as side effect
function ipv6_capable() {
    [ "$NETTYPE" = "qeth" ] || return 1
    case $cardtype in
        OSD_10GIG|OSD_1000|OSD_100|OSD_Express|"GuestLAN QDIO") return 0 ;;
        HiperSockets)
            if isLayer2; then
                return 0
            elif [ $(linux_version) -ge $(kernel_version 2 6 26) ]; then
                return 0
            else
                return 1
            fi
            ;;
        OSD_GbE_LANE|OSD_FE_LANE|OSD_TR_LANE|OSD_ATM_LANE) return 1 ;;
        HSTR|OSN|unknown) return 1 ;;
        "GuestLAN Hiper") return 1 ;;
        *) echo $"Unknown card_type to determine IPv6 support"
            return 1 ;;
    esac
}

function insert_module() {
    local module=${1}
    if grep "^${module%.ko} .*$" /proc/modules &> /dev/null ; then
        # module has already been loaded => do not try to load again
        return 0
    fi
    if ! insmod $module; then
        echo $"Could not load kernel module $module"
    fi
}

function load_kernel_modules() {
    if [ ":$NETTYPE" = ":ctc" ]; then
        insert_module ccwgroup$LO
        insert_module cu3088$LO
        insert_module fsm$LO
        insert_module ctc$LO
    elif [ ":$NETTYPE" = ":iucv" ]; then
        insert_module fsm$LO
        insert_module iucv$LO
        insert_module netiucv$LO
    elif [ "$NETTYPE" = "lcs" ]; then
        insert_module ccwgroup$LO
        insert_module cu3088$LO
        insert_module lcs$LO
    elif [ "$NETTYPE" = "qeth" ]; then
        insert_module crypto_api$LO
        insert_module xfrm_nalgo$LO
        insert_module ipv6$LO
        insert_module ccwgroup$LO
        insert_module qdio$LO
        insert_module qeth$LO
    fi
}

function remove_module() {
    if ! rmmod $1; then
        #echo $"Could not remove kernel module $1"
        :
    fi
}

function remove_kernel_modules() {
    if [ ":$NETTYPE" = ":ctc" ]; then
        remove_module ctc
        remove_module fsm
        remove_module cu3088
        remove_module ccwgroup
    elif [ ":$NETTYPE" = ":iucv" ]; then
        remove_module netiucv
        remove_module iucv
        remove_module fsm
    elif [ "$NETTYPE" = "lcs" ]; then
        remove_module lcs
        remove_module cu3088
        remove_module ccwgroup
    elif [ "$NETTYPE" = "qeth" ]; then
        remove_module qeth
        remove_module qdio
        remove_module ccwgroup
        # The remaining 3 modules can hardly be unloaded
        # since e.g. loopback holds an inet6 address and thus a reference.
        # But that's no problem as long as the device drivers are removed.
        remove_module ipv6
        remove_module xfrm_nalgo
        remove_module crypto_api
    fi
}

# sets device online _and_ retrieves DEVICE at the same time
# iucv cannot be set online since it's not based on ccw(group)
function set_device_online() {
    echo $"Activating network device..."
    local sysnettype
    case "${NETTYPE}" in
        qeth) sysnettype=${NETTYPE} ;;
        lcs|ctc) sysnettype=cu3088 ;;
    esac
    if ! [ -f /sys/devices/${sysnettype}/$SCH_R_DEVBUSID/online ]; then
        echo $"Sysfs path to set device online does not exist."
        return 1
    fi
    if ! sysecho /sys/devices/${sysnettype}/$SCH_R_DEVBUSID/online "1"; then
        echo $"Could not set device ($SUBCHANNELS) online"
        return 1
    fi
    local i=1
    while : ; do
        local online
        read online < /sys/devices/${sysnettype}/$SCH_R_DEVBUSID/online
        [ "$online" == "1" ] && break
        sleep 1
        i=$((i+1))
        if [ "$i" -gt 10 ]; then
            echo $"Could not set device ($SUBCHANNELS) online within timeout"
            return 1
        fi
    done
    if [ "$NETTYPE" = "lcs" -o "$NETTYPE" = "ctc" ]; then
        # KH FIXME: Workaround for missing sysfs interface
        #   DEVICE=`cat /sys/devices/lcs/${SUBCHANNELS//,*/}/if_name`
        # replaced with flexible solution:
        # https://bugzilla.redhat.com/show_bug.cgi?id=204803#c9
        # "sys/bus/ccwgroup/devices/${SUBCHANNEL}/net\:*
        # for lcs after setting online"
        if [ ! -h /sys/devices/${sysnettype}/$SCH_R_DEVBUSID/net:* ]; then
            echo $"Device $SUBCHANNELS does not have required sysfs attribute 'net:*'"
            return 1
        fi
        DEVICE=$(echo /sys/devices/${sysnettype}/$SCH_R_DEVBUSID/net:*)
        DEVICE=${DEVICE//*:/}
        if [ "$DEVICE" = "" ]; then
            echo $"Could not get device name for $SUBCHANNELS"
            return 1
        fi
    else # qeth
        if [ ! -f /sys/devices/qeth/$SCH_R_DEVBUSID/if_name ]; then
            echo $"Device $SUBCHANNELS does not have required sysfs attribute 'if_name'"
            return 1
        fi
        # (device needs to be online to read if_name from sysfs attribute!)
        read DEVICE < /sys/devices/qeth/$SCH_R_DEVBUSID/if_name
        if [ "$DEVICE" = "" ]; then
            echo $"Could not get device name for $SUBCHANNELS"
            return 1
        fi
        if [ -f /sys/devices/qeth/$SCH_R_DEVBUSID/card_type ]; then
            read cardtype < /sys/devices/qeth/$SCH_R_DEVBUSID/card_type
            #debug echo "$cardtype"
            # device is now online and link type will be known
            echo -n $"Detected: "
            cardtype2cleartext "$cardtype"
        else
            echo $"Could not read qeth network card type from sysfs."
        fi
    fi
}

# sets device up and blocks until device appears to be up
function set_device_up() {
    if [ -z "$DEVICE" ]; then
        echo $"Could not determine interface name to bring up device $SUBCHANNELS"
        return 1
    fi
    # Device does not come up fast enough to use "ip" to configure, so block.
    # While OSA come up themselves after setting online,
    # e.g. HiperSocket won't, so set them up explicitly for the following check
    debug ip link set up $DEVICE
    local i=1
    while : ; do
        local tst=$(ip -o link show up dev $DEVICE)
        [ -n "$tst" ] && break
        sleep 1
        i=$((i+1))
        if [ "$i" -gt 10 ]; then
            echo $"Could not bring up device $DEVICE within timeout"
            return 1
        fi
    done
    return 0
}

function syntax_check_domainname() {
    # - match against regex adopted from RFC1035,sec.2.3.1 or RFC1034,sec.3.5
    #   (Internationalized Domain Names in Applications (IDNA) [RFC4690]
    #    have to be entered after encoding by punycode [RFC3492])
    [[ "$1" =~ ^[[:alpha:]]([[:alnum:]-]{0,61}[[:alnum:]])?(\\.[[:alpha:]]([[:alnum:]-]{0,61}[[:alnum:]])?)*$ ]]
    case $? in
        0)
            # string matched the pattern
            return 0
            ;;
        1)
            # string did not match the pattern
            echo "$2"
            ;;
        2)
            echo "l.$LINENO: syntax error in regex of match operator =~, code needs to be fixed" 1>&2
            ;;
        *)
            echo "l.$LINENO: unexpected return code of regex match operator =~, code needs to be fixed" 1>&2
            ;;
    esac
    return 1
}

function modprobe_alias() {
    if [ ":$NETTYPE" = ":iucv" ]; then
        echo "alias $DEVICE netiucv" >> /tmp/modprobe.conf
    else
        echo "alias $DEVICE $NETTYPE" >> /tmp/modprobe.conf
    fi
    if [ $? -ne 0 ]; then
        echo $"Could not append alias for network device $DEVICE to modprobe.conf"
        return 1
    fi
    return 0
}

function disable_ipv6_autoconf() {
    sysctl -w net.ipv6.conf.all.accept_ra=0 > /dev/null
    sysctl -w net.ipv6.conf.all.accept_redirects=0 > /dev/null
    sysctl -w net.ipv6.conf.all.autoconf=0 > /dev/null
    sysctl -w net.ipv6.conf.default.accept_ra=0 > /dev/null
    sysctl -w net.ipv6.conf.default.accept_redirects=0 > /dev/null
    sysctl -w net.ipv6.conf.default.autoconf=0 > /dev/null
}

function configure_ipv6_address() {
    # device needs to be online
    # arp flag needs to be on for ipv6 over osa because of ndisc.
    # happens automatically by the driver. do NOT mess with default setting.
    #NO#debug ip link set dev $DEVICE arp on
    if ! debug ip -6 address add $IPADDR/$NETMASK dev $DEVICE; then
        echo $"Could net set IPv6 address $IPADDR/$NETMASK for device $DEVICE"
        return 1
    fi
    # network route has been set by above "ip address add" already
    # take care of MTU, which is bundled with ifconfig in the other IPv4 cases
    if [ -n "$MMTU" ]; then
        if ! debug ip link set $DEVICE $MMTU; then
            echo $"Could net set maximum transfer unit ($MMTU) for device $DEVICE"
            return 1
        fi
    fi
    return 0
}

function configure_ipv4_address() {
    # it's IPv4 and we can make use of ipcalc for better usability
    if ipcalc -bmnp $ipcalc_arg > /tmp/ipcalc.$$.out 2> /dev/null; then
        . /tmp/ipcalc.$$.out
    else
        echo $"Could not calculate network address and broadcast address from"
        echo $" IPv4 address $IPADDR and netmask $NETMASK"
        return 1
    fi
    rm /tmp/ipcalc.$$.out
    # device needs to be online
    if ! debug ifconfig $DEVICE $IPADDR $MMTU netmask $NETMASK broadcast $BROADCAST; then
        echo $"Could not set IPv4 address $IPADDR for device $DEVICE"
        echo $" with network mask $NETMASK and broadcast address $BROADCAST"
        [ -n "$MMTU" ] && echo $" and maximum transfer unit: $MMTU"
        return 1
    fi
    # This network route is already there after ifconfig!
    #if ! debug route add -net $NETWORK netmask $NETMASK dev $DEVICE; then
    #    echo $"Could not add network route to $NETWORK/$NETMASK on device $DEVICE"
    #    return 1
    #fi
    return 0
}

function handle_mtu() {
    # don't ask for MTU, but use it if it has been set in the .parm file
    # don't overwrite MMTU if it has been set for CTC
    [ -n "$MTU" -a -z "$MMTU" ] && MMTU="mtu $MTU"
}

function rollback_config() {
    # each transaction to roll back may fail, if previous setup has not
    # made progress that far to reach a certain transation
    # => error output is misleading and should be avoided
    [ -n "$DEVICE" ] && tv ip -4 route flush default dev $DEVICE
    [ -n "$DEVICE" ] && tv ip -6 route flush default dev $DEVICE
    # address flush seems to be effective for all address families
    [ -n "$DEVICE" ] && ip address flush dev $DEVICE
    # iucv device needs to be down before removal
    [ -n "$DEVICE" ] && ip link set down $DEVICE &> /dev/null
    if [ -n "$NETTYPE" ]; then
        if [ "$NETTYPE" = "iucv" ]; then
            if [ -n "$DEVICE" ]; then
                sysecho /sys/bus/iucv/drivers/netiucv/remove $DEVICE
            fi
        else # "$NETTYPE" != "iucv"
            if [ -n "$SCH_R_DEVBUSID" ]; then
                local sysnettype
                case "${NETTYPE}" in
                    qeth) sysnettype=${NETTYPE} ;;
                    lcs|ctc) sysnettype=cu3088 ;;
                esac
                [ -f /sys/devices/${sysnettype}/$SCH_R_DEVBUSID/online ] && \
                    sysecho /sys/devices/${sysnettype}/$SCH_R_DEVBUSID/online "0"
                [ -f /sys/devices/${sysnettype}/$SCH_R_DEVBUSID/ungroup ] && \
                    sysecho /sys/devices/${sysnettype}/$SCH_R_DEVBUSID/ungroup "1"
            fi
        fi
    fi
    [ -z "$mtu_was_set" ] && unset MTU
    [ -z "$mmtu_was_set" ] && unset MMTU
    [ -z "$vswitch_was_set" ] && unset VSWITCH
    # Try to silently unload modules. We ignore failures since
    # load_kernel_modules only tries to load missing modules.
    tv remove_kernel_modules
    # prevent possible reuse of an old DEVICE on restarting dialog
    unset DEVICE
}

### workflow helper functions

# workflow ideas:
# - setting/applying single configuration steps right away save us explicit
#   syntactical & semantic checks PLUS we get direct feedback on error
# - check error level of forked external programs and react on errors

unset reenter
unset redoitem
unset interaction_happened

function reenter() {
    [ -z "$reenter" ] && return 1
    # reenter menu should only be shown if NOT redoing item
    if [ -n "$redoitem" ]; then
        # unset redoitem # wrong => do NOT do this here
        return 1
    fi
    return 0
}

function reenter_menu() {
    local oldvalue=$1
    interaction_happened="yes"
    # unsetting input here is not sufficient, since reenter_menu
    # is not called for predefined parameters
    # which then might get assigned a previous old input of another parameter!
    #unset input
    reenter || return 0
    # don't present reenter menu for empty parameters
    # (currently ignoring parameters that are allowed to be empty!)
    # this could be improved by checking if variable has been set/defined
    #[ -z "$1" ] && return 0
    while : ; do
        if [ -n "$helptext" ]; then
            echo $"0) default is previous \"$oldvalue\", 1) new value, ?) help"
        else
            echo $"0) default is previous \"$oldvalue\", 1) new value"
        fi
        # uncoded alternative: 2) skip parameter
        local answer
        read answer
        [ -z "$answer" ] && return 1
        case $answer in
            0) return 1 ;;
            1)  # Deciding to enter new value gets user out of reenter-mode
                # temporarily for this parameter.
                # To put it differently: redoing does NOT present old values.
                redoitem="yes"
                echo -n $"new value: "
                return 0
                ;;
            "?") input="?"
                return 1
                ;;
        esac
    done
}

function workflow_item_menu() {
    local noredo=$1
    # default is to continue if running kickstart to prevent interaction
    [ -n "$RUNKS" ] && return 0
    interaction_happened="yes"
    while : ; do
        unset redoitem
        if [ "$noredo" = "noredo" ]; then
            echo $"1) continue, 2) restart dialog, 3) halt, 4) shell"
        else
            echo $"0) redo this parameter, 1) continue, 2) restart dialog, 3) halt, 4) shell"
        fi
        local answer
        read answer
        case $answer in
            0) [ "$noredo" = "noredo" ] && continue
                redoitem="yes"
                continue 2
                ;;
            1) return 0 ;; # can be used to break at caller on ignore
            2) reenter="yes"
                rollback_config
                continue 3
                ;;
            3) tv doshutdown
                exit 0
                ;;
            4) echo $"Enter 'exit' at the shell prompt to get back to the installation dialog."
                /bin/bash
                if [ "$noredo" != "noredo" ] && [ -n "$question_prefix" ]; then
                    $question_prefix
                    echo
                fi
                ;; # stay in workflow item menu
        esac
    done
}

# input variables: PARMNAME, question_prefix, question_choices,
#                  "options" ...
# output variables: $question_prefix, $helptext
# modifies: the variable named $PARMNAME, $OPTIND
function ask() {
    [ $# -lt 3 ] && echo "l.$LINENO: too few arguments (<3), please fix calling code." 1>&2
    local PARMNAME=$1
    shift
    question_prefix=$1
    shift
    local question_choices=$1
    shift
    local exception
    local syntax_check
    unset helptext
    local handle
    local finish
    local optname
    OPTIND=1
    while getopts ":e:s:h:c:f:" optname; do
        case $optname in
            e) exception=$OPTARG ;;
            s) syntax_check=$OPTARG ;;
            h) helptext=$OPTARG ;;
            c) handle=$OPTARG ;;
            f) finish=$OPTARG ;;
            "?") ;; # ignore invalid option
            :) echo $"l.$LINENO: Missing parameter to option -$OPTARG" 1>&2 ;;
        esac
    done
    while : ; do
        unset input
        local input
        # actually ask question if one of the following is true:
        # - $PARMNAME parameter has not been set yet, e.g. not in parm file
        # - on 2nd and further attempts, i.e. redoing the parameter
        # - on having restarted the whole dialog
        # describing the same from another viewpoint:
        # - if $PARMNAME has been set, try to check syntax and apply
        # - on redo, $PARMNAME has been set and reenter is false,
        #   but still ask question again
        # - on reenter, $PARMNAME might have been set, but still ask question
        if [ -z "${!PARMNAME}" -o -n "$redoitem" -o -n "$reenter" ]; then
            # one empty line to separate parameter questions from each other
            echo
            $question_prefix
            if reenter; then
                echo
            else
                $question_choices
            fi
            # on reenter, give choice between old value and entering new one
            reenter_menu ${!PARMNAME} && read input \
                && [ "$input" != "?" ] && eval ${PARMNAME}=\$input
            # escaping the $ in the RHS of the eval statement makes it safe
        fi
        if [ -n "$helptext" ] && [ "$input" = "?" ]; then
            $helptext
            continue
        fi
        # optional: default or exceptional handling
        [ -n "$exception" ] && $exception
        if [ -n "$syntax_check" -a -z "$handle" ]; then
            # some parameters have only syntax check (and deferred config):
            if $syntax_check; then
                break
            else
                workflow_item_menu && break
            fi
        elif [ -n "$syntax_check" -a -n "$handle" ]; then
            # most common parameters have syntax and configuration:
            # user might still continue on syntax error
            $syntax_check || workflow_item_menu
            # optional: actual configuration
            if $handle; then
                # parmname has been configured successfully
                break
            else
                # user might still continue on configuration failure
                workflow_item_menu && break
            fi
        elif [ -n "$finish" ]; then
            # few parameters need special handling done by their own function:
            $finish
        else
            echo "Unsupported calling of ask function, please fix calling code"
        fi
    done # PARMNAME
    # disable potential temporary redoing-mode during reenter-mode
    unset redoitem
}

### NETTYPE

function syntax_check_nettype() {
    # - NETTYPE \in {qeth,lcs,ctc,iucv}
    [[ "$NETTYPE" =~ (^qeth$)|(^lcs$)|(^ctc$)|(^iucv$) ]]
    case $? in
        0)
            # string matched the pattern
            if [ "$NETTYPE" = "iucv" ] && ! isVM; then
                echo $"IUCV network type is only available under z/VM (NETTYPE)."
                return 1
            fi
            return 0
            ;;
        1)
            # string did not match the pattern
            ;;
        2)
            echo "l.$LINENO: syntax error in regex of match operator =~, code needs to be fixed" 1>&2
            ;;
        *)
            echo "l.$LINENO: unexpected return code of regex match operator =~, code needs to be fixed" 1>&2
            ;;
    esac
    echo $"Incorrect format or value for network type (NETTYPE): $NETTYPE"
    return 1
}

function question_prefix_nettype() {
    echo -n $"Network type"
}

function question_choices_nettype() {
    if isVM; then
        echo $" (qeth, lcs, ctc, iucv, ? for help). Default is qeth:"
    else
        echo $" (qeth, lcs, ctc, ? for help). Default is qeth:"
    fi
}

function helptext_nettype() {
    echo $" Help text for network type:"
    echo $"  qeth: OSA-Express Fast Ethernet, Gigabit Ethernet (including 1000Base-T),"
    echo $"        High Speed Token Ring, and ATM (running Ethernet LAN emulation)"
    echo $"        features in QDIO mode."
    echo $"        [default]"
    echo $"  lcs:  OSA-2 Ethernet/Token Ring, OSA-Express Fast Ethernet in non-QDIO mode,"
    echo $"        OSA-Express High Speed Token Ring in non-QDIO mode and Gigabit Ethernet"
    echo $"        in non-QDIO mode."
    echo $"  ctc:  Deprecated, useful for migration."
    isVM && echo $"  iucv: Deprecated, useful for migration."
}

function exception_nettype() {
    # - default is qeth since it should be common
    if [ -z "$NETTYPE" ]; then
        NETTYPE=qeth
        break
    fi
}

function finish_nettype() {
    if syntax_check_nettype; then
        break
    else
        # necessary parts which would otherwise be done by workflow_item_menu
        interaction_happened="yes"
        redoitem="yes"
    fi
}

function do_nettype() {
    ask NETTYPE \
        question_prefix_nettype question_choices_nettype \
        -h helptext_nettype -e exception_nettype -f finish_nettype
}

### CHANDEV

function do_chandev() {
    echo
    echo $"The CHANDEV variable isn't used anymore, please update your "
    echo $".parm or the .conf file to use NETTYPE, SUBCHANNELS, etc. instead."
    echo
}

### SUBCHANNELS

function syntax_check_subchannels() {
    SUBCHANNELS=`echo $SUBCHANNELS | tr ABCDEF abcdef`
    # - make subchannel question dependent on NETTYPE (2 vs. 3 subchannels)
    if [ "$NETTYPE" = "qeth" ]; then
        # - match against regex, depending on qeth
        [[ "$SUBCHANNELS" =~ ^[[:xdigit:]]+\\.[0-3]\\.[[:xdigit:]]{4},[[:xdigit:]]+\\.[0-3]\\.[[:xdigit:]]{4},[[:xdigit:]]+\\.[0-3]\\.[[:xdigit:]]{4}$ ]]
    else
        # - match against regex, depending on lcs/ctc
        [[ "$SUBCHANNELS" =~ ^[[:xdigit:]]+\\.[0-3]\\.[[:xdigit:]]{4},[[:xdigit:]]+\\.[0-3]\\.[[:xdigit:]]{4}$ ]]
    fi
    case $? in
        0)
            # string matched the pattern
            return 0
            ;;
        1)
            # string did not match the pattern
            echo $"Incorrect format for channels (SUBCHANNELS): $SUBCHANNELS"
            ;;
        2)
            echo "l.$LINENO: syntax error in regex of match operator =~, code needs to be fixed" 1>&2
            ;;
        *)
            echo "l.$LINENO: unexpected return code of regex match operator =~, code needs to be fixed" 1>&2
            ;;
    esac
    return 1
}

function semantic_check_subchannels() {
    local subch_count
    if [ "$NETTYPE" = "qeth" ]; then
        subch_count=3
    else
        subch_count=2
    fi
    # done: make subchannel handling more robust by not relying on REMATCH
    local -a subch_array
    IFS=,
    read -a subch_array <<< "indexzero,$SUBCHANNELS"
    unset IFS
    local i
    local all_subch_good=0
    for ((i=1; i <= $subch_count; i++)); do
        local devbusid=${subch_array[$i]}
        # remember first subchannel for potential undo of ccwgroup
        # (via /sys/devices/qeth/$SCH_R_DEVBUSID/ungroup)
        [ "$i" -eq 1 ] && SCH_R_DEVBUSID=$devbusid
        local prefix ssid devno foo
        IFS=.
        read prefix ssid devno foo <<< "$devbusid"
        unset IFS
        local dev_p=$(echo /sys/devices/css$prefix/$IDFORMAT/$devbusid)
        # - check for existence of devnos in sysfs
        if [ ! -d "$dev_p" -a "$cio_wc_bytes" != "0" ]; then
            # - try to free from /proc/cio_ignore if they don't exist
            echo $"Device $devbusid not present, trying to clear from blacklist and resense..."
            if sysecho /proc/cio_ignore "free $devbusid"; then
                # /proc/cio_ignore won't block on freeing devices
                # until resensing has been completed, so wait until
                # the udev event queue depletes (without udevsettle we
                # could wait 2 seconds unconditionally)
                #debug ls -laF /dev/.udev
                udevsettle
                # even though the device might now be online, some of its
                # sysfs attributes (e.g. cutype) might not yet be available
                sleep 1
            else
                echo $"Device $devbusid could not be cleared from device blacklist"
            fi
        fi
        # reevaluate since globbing might not have worked before device existed
        dev_p=$(echo /sys/devices/css$prefix/$IDFORMAT/$devbusid)
        if [ ! -d "$dev_p" ]; then
            echo $"Device $devbusid does not exist"
            all_subch_good=1
            continue
        fi
        # devno does exist now
        local subch_p=${dev_p%/*}
        local subch=${subch_p##*/}
        # filter definitely unusable subchannels ...
        # - check for subchannel type I/O
        if [ -f $subch_p/type ]; then
            local type
            read type < $subch_p/type
            if [ "$type" != "$SUBCHANNEL_TYPE_IO" ]; then
                echo $"Channel $subch (device $devbusid) is not of type I/O"
                all_subch_good=1
                continue
            fi
        fi
        # - check for correct CU type/model, depending on qeth/lcs/ctc
        if [ ! -f $dev_p/cutype ]; then
            echo $"Device $devbusid does not have required sysfs attribute 'cutype'"
            all_subch_good=1
            continue
        fi
        local cutype
        read cutype < $dev_p/cutype
        if search_cu $cutype; then
            if [ "${CU_DEVDRV[$cu_idx]}" != "$NETTYPE" ]; then
                echo $"Device $devbusid has control unit type $cutype,"
                echo $" which does not match your selected network type $NETTYPE"
                all_subch_good=1
                continue
            fi
        else
            echo $"Device $devbusid has control unit type $cutype which is unknown"
            all_subch_good=1
            continue
        fi
        # read CHPIDs information about subchannels
        if [ ! -f $subch_p/chpids ]; then
            echo $"Channel $subch (device $devbusid) does not have required sysfs attribute 'chpids'"
            all_subch_good=1
            continue
        fi
        local chpid_list
        read chpid_list < $subch_p/chpids
        local -a chpids
        read -a chpids <<< "$chpid_list"
        if [ ${#chpids[@]} -ne 8 ]; then
            echo $"sysfs reported ${#chpids[@]} CHPIDs instead of expected 8, code needs fix"
        fi
        if [ ! -f $subch_p/pimpampom ]; then
            echo $"Channel $subch (device $devbusid) does not have required sysfs attribute 'pimpampom'"
            all_subch_good=1
            continue
        fi
        local pim pam pom foo
        read pim pam pom foo < $subch_p/pimpampom
        local pimchpidZ=""
        for ((chp=0; chp < 8; chp++)); do
            local mask=$((0x80 >> chp))
            if (( 0x$pim & $mask )); then
                pimchpidZ=${pimchpidZ}${chpids[chp]}
            else
                pimchpidZ=${pimchpidZ}"ZZ"
            fi
        done
        local pimchpids=${pimchpidZ//ZZ/}
        if [ "x$pimchpids" == "x" ]; then
            echo $"Channel $subch (device $devbusid) does not have any installed channel path"
            all_subch_good=1
            continue
        fi
        # compare parts of different subchannels for required matches
        if [ "$i" -eq 1 ]; then
            # remember parts of first subchannel for comparison
            local sch_r_prefix=$prefix
            local sch_r_ssid=$ssid
            local sch_r_devno=$devno
            local sch_r_pimchipidZ=$pimchpidZ
            local sch_r_cutype=$cutype
        else
            local comparison=0
            # $sch_r_... might be empty if first channel was wrong
            # => be sure to quote all variable accesses in test statements.
            # - all subchannels must be of same CU type/model
            if [ "$cutype" != "$sch_r_cutype" ]; then
                echo $"Device $devbusid does not have the same control unit type as device $SCH_R_DEVBUSID"
                comparison=1
            fi
            # - all subchannels must have same CHPIDs
            if [ "$pimchpidZ" != "$sch_r_pimchipidZ" ]; then
                echo $"Device $devbusid does not have the same CHPIDs as device $SCH_R_DEVBUSID"
                comparison=1
            fi
            # - all subchannels should have same prefix & ssid ?
            if [ "$prefix" != "$sch_r_prefix" \
                -o "$ssid" != "$sch_r_ssid" ]; then
                echo $"Device $devbusid does not have the same prefix and subchannel set ID as device $SCH_R_DEVBUSID"
                comparison=1
            fi
            if [ "$i" -eq 2 ]; then
                local sch_w_devbusid=$devbusid
                local sch_w_devno=$devno
                # - write_devbusid == read_devbusid+1
                if [ $((0x$devno)) -ne $((0x$sch_r_devno + 1)) ]; then
                    echo $"Device bus ID of write channel (dev $devbusid) must be one larger than"
                    echo $" that of read channel (dev $SCH_R_DEVBUSID)"
                    comparison=1
                fi
            elif [ "$i" -eq 3 ]; then
                # check data subchannel unequal to read/write subchannel
                # (also seems to be handled by ccwgroup kernel subsystem)
                if [ "$devbusid" = "$sch_w_devbusid" \
                    -o "$devbusid" = "$SCH_R_DEVBUSID" ]; then
                    echo $"Device bus ID of data channel (dev $devbusid) must be different to that of"
                    echo $" read channel ($SCH_R_DEVBUSID) and write channel ($sch_w_devbusid)"
                    comparison=1
                fi
            fi
            if [ "$comparison" != 0 ]; then
                all_subch_good=1
                continue
            fi
        fi
        # filter potentially good subchannels ...
        if [ -h $dev_p/group_device ]; then
            echo $"Device $devbusid is already in a ccwgroup and thus unavailable"
            all_subch_good=1
            continue
        fi
        if [ ! -f $dev_p/online ]; then
            echo $"Device $devbusid does not have required sysfs attribute 'online'"
            all_subch_good=1
            continue
        fi
        local online
        read online < $dev_p/online
        if [ "$online" = "1" ]; then
            echo $"Device $devbusid is already in use and thus unavailable"
            all_subch_good=1
            continue
        fi
        # - check availability
        if [ ! -f $dev_p/availability ]; then
            echo $"Device $devbusid does not have required sysfs attribute 'availability'"
            all_subch_good=1
            continue
        fi
        local availability
        read availability < $dev_p/availability
        if [ "$availability" != "good" ]; then
            echo $"Device $devbusid is not available but '$availiability'"
            all_subch_good=1
            continue
        fi

    done # for ((i=1; i <= $subch_count; i++))
    if [ "$all_subch_good" = "0" ]; then
        return 0
    fi
    return 1
}

function handle_subchannels() {
    # - try to establish ccwgroup right here and fail out on error
    if sysecho /sys/bus/ccwgroup/drivers/${NETTYPE}/group "$SUBCHANNELS"; then
        case "$NETTYPE" in
            qeth)
                # Just preliminary card_type info until device goes online!
                # In fact it seems enough to separate OSA from HiperSocket.
                if [ -f /sys/devices/qeth/$SCH_R_DEVBUSID/card_type ]; then
                    read cardtype < /sys/devices/qeth/$SCH_R_DEVBUSID/card_type
                else
                    echo $"Could not read qeth network card type from sysfs."
                fi
                ;;
            ctc|lcs)
                if [ -f /sys/devices/cu3088/$SCH_R_DEVBUSID/type ]; then
                    local type=$(cat /sys/devices/cu3088/$SCH_R_DEVBUSID/type)
                    [ "$type" = "CTC/A" ] && type="channel-to-channel adapter"
                    echo "Detected: $type"
                else
                    echo $"Could not read ctc network card type from sysfs."
                fi
                ;;
        esac
        return 0
    else
        echo $"Channels $SUBCHANNELS could not be grouped"
    fi
    return 1
}

function question_prefix_subchannels() {
    if [ "$NETTYPE" = "qeth" ]; then
        echo -n $"Read,write,data channel"
    else
        echo -n $"Read,write channel"
    fi
}

function question_choices_subchannels() {
    if [ "$NETTYPE" = "qeth" ]; then
        echo $" (e.g. 0.0.0300,0.0.0301,0.0.0302 or ? for help)."
    else
        echo $" (e.g. 0.0.0600,0.0.0601 or ? for help)"
    fi
}

function helptext_subchannels() {
    if [ "$NETTYPE" = "qeth" ]; then
        echo $" Help text for qeth channels:"
        echo $"  Enter the device bus ID of your CCW devices."
        echo $"  QETH needs three channels for read, write, and data,"
        echo $"  e.g. 0.0.0300,0.0.0301,0.0.0302"
    else
        echo $" Help text for lcs/ctc channels:"
        echo $"  Enter the device bus ID of your CCW devices."
        echo $"  CTC/ESCON and LCS need two channels for read and write,"
        echo $"  e.g. 0.0.0600,0.0.0601 will configure the CTC or ESCON interface"
        echo $"  with the channels 0x600 and 0x601"
    fi
}

function finish_subchannels() {
    syntax_check_subchannels || workflow_item_menu
    # continuing on syntax error is doomed to fail,
    # since handle_subchannels relies on the regex-based strict parsing
    # in syntax_check_subchannels which does not match anything then
    # news: relaxed by splitting semantic check and actual handling
    semantic_check_subchannels || workflow_item_menu
    if handle_subchannels; then
        break
    else
        workflow_item_menu && break
    fi
}

function do_subchannels() {
    ask SUBCHANNELS \
        question_prefix_subchannels question_choices_subchannels \
        -h helptext_subchannels -f finish_subchannels
}

### PORTNAME (qeth)

function syntax_check_portname() {
    # - 1-8 characters, we convert it to upper case
    PORTNAME=`echo $PORTNAME | tr '[:lower:]' '[:upper:]'`
    local portname_len=${#PORTNAME}
    if [ "$portname_len" -ge 1 -a "$portname_len" -le 8 ]; then
        return 0
    fi
    echo $"Incorrect string length [1..8] for portname (PORTNAME): $PORTNAME"
    return 1
}

function handle_portname() {
    [ -n "$PORTNAME" ] || return 0
    # - try to set portname right here w/ error handling
    if sysecho /sys/devices/${NETTYPE}/$SCH_R_DEVBUSID/portname "$PORTNAME"; then
        return 0
    else
        echo $"Portname '$PORTNAME' could not be configured for $SUBCHANNELS"
    fi
    return 1
}

function hint_portname() {
    if [ -f /sys/devices/${NETTYPE}/$SCH_R_DEVBUSID/portname ]; then
        local pname_hint
        read pname_hint < /sys/devices/${NETTYPE}/$SCH_R_DEVBUSID/portname
        if [ "$pname_hint" = "no portname required" ]; then
            echo $"  * Your configuration does not require a portname. *"
        fi
    fi
}

function question_prefix_portname(){
    echo -n $"Portname"
}

function question_choices_portname(){
    echo $" (1..8 characters, or ? for help). Default is no portname:"
}

function helptext_portname(){
    echo $" Help text for portname:"
    # updated text describing when portname is obsolete;
    # taken from:
    # SA22-7935-09, Open Systems Adapter-Express Customer's
    #   Guide and Reference, 10th ed. May 2008, IBM, p.17f.
    # SC33-8411-00, Device Drivers, Features, and Commands,
    #   1st ed. May 2008, IBM, p.116.
    echo $"  Portname of the OSA-Express feature in QDIO mode and z/VM Guest LAN."
    echo $"  This parameter is optional with:"
    echo $"   - z/VM 4.4.0 or z/VM 4.3.0 with APARs VM63308 and PQ73878"
    echo $"   - z800, z900 with >= Driver 3G - EC stream J11204, MCL032 (OSA level 3.33)"
    echo $"   - z890, z990, z9, z10 mainframes"
    hint_portname
    echo $"  If portname is used, all operating systems sharing port must use same name."
    echo $"  Input empty string if you don't want to enter a portname. [default]"
}

function exception_portname(){
    [ -z "$PORTNAME" ] && break
}

function do_portname() {
    ask PORTNAME \
        question_prefix_portname question_choices_portname \
        -h helptext_portname \
        -e exception_portname -s syntax_check_portname -c handle_portname
}

### PORTNO (qeth)

function syntax_check_qeth_portno() {
    case $PORTNO in
        0|1)
            return 0
            ;;
    esac
    echo $"Incorrect format or value for relative port number (PORTNO): $PORTNO"
    return 1
}

function handle_qeth_portno() {
    if sysecho /sys/devices/qeth/$SCH_R_DEVBUSID/portno "$PORTNO"; then
        return 0
    fi
    echo $"Could not configure relative port number $PORTNO for $SUBCHANNELS"
    return 1
}

function question_prefix_portno() {
    echo -n $"Relative port number for OSA"
}

function question_choices_portno() {
    echo $" (0, 1, or ? for help). Default is 0:"
}

function helptext_portno() {
    echo $" Help text for relative port number for OSA with 2 ports per CHPID:"
    echo $"  This applies to:"
    echo $"   - OSA-Express3 Gigabit Ethernet on z10 systems"
    echo $"   - OSA-Express ATM on zSeries 800 and 900 systems"
    echo $"  0 for relative port number 0 [default]"
    echo $"  1 for relative port number 1"
    echo $"  Input empty string to not modify the default configuration."
}

function exception_portno() {
    # Writing portno of e.g. hipersocket device fails.
    # Therefore, do not configure on empty default value.
    [ -z "$PORTNO" ] && break
}

function do_portno() {
    ask PORTNO \
        question_prefix_portno question_choices_portno \
        -h helptext_portno -e exception_portno \
        -s syntax_check_qeth_portno -c handle_qeth_portno
}

### LAYER2

function syntax_check_layer2() {
    # - $LAYER2 \in {0,1}
    case $LAYER2 in
        0|1)
            return 0
            ;;
    esac
    echo $"Incorrect format or value for layer2 mode (LAYER2): $LAYER2"
    return 1
}

function handle_layer2() {
    [ "$NETTYPE" == "qeth" ] || return 0
    [ -n "$LAYER2" ] || return 0
    # - try to set layer2 mode right here w/ error handling
    if sysecho /sys/devices/${NETTYPE}/$SCH_R_DEVBUSID/layer2 "$LAYER2"; then
        return 0
    else
        echo $"Layer2 mode '$LAYER2' could not be configured for $SUBCHANNELS"
    fi
    return 1
}

function question_prefix_layer2() {
    echo -n $"Layer mode"
}

function question_choices_layer2() {
    echo -n $" (0 for layer3, 1 for layer2, or ? for help)."
    if [ "$isLayer2Default" = "yes" ]; then
        echo $" Default is 1:"
    else
        echo $" Default is 0:"
    fi
}

function helptext_layer2() {
    echo $" Help text for OSA mode of operation: layer 2 vs. layer 3"
    if [ "$isLayer2Default" = "yes" ]; then
        echo $"  0 for layer 3 mode (may not work with dhcp, tcpdump, etc.)"
        echo $"  1 for layer 2 mode [default]"
    else
        echo $"  0 for layer 3 mode [default] (may not work with dhcp, tcpdump, etc.)"
        echo $"  1 for layer 2 mode"
    fi
}

function exception_layer2() {
    [ -z "$LAYER2" ] && break
}

function do_layer2() {
    isLayer2Default && isLayer2Default=yes || isLayer2Default=no
    ask LAYER2 \
        question_prefix_layer2 question_choices_layer2 \
        -h helptext_layer2 -e exception_layer2 \
        -s syntax_check_layer2 -c handle_layer2
}

### MACADDR

function syntax_check_macaddr() {
    # - match against regex
    [[ "$MACADDR" =~ ^[[:xdigit:]][[:xdigit:]]:[[:xdigit:]][[:xdigit:]]:[[:xdigit:]][[:xdigit:]]:[[:xdigit:]][[:xdigit:]]:[[:xdigit:]][[:xdigit:]]:[[:xdigit:]][[:xdigit:]]$ ]]
    case $? in
        0)
            # string matched the pattern
            return 0
            ;;
        1)
            # string did not match the pattern
            echo $"Incorrect format for mac address (MACADDR): $MACADDR"
            ;;
        2)
            echo "l.$LINENO: syntax error in regex of match operator =~, code needs to be fixed" 1>&2
            ;;
        *)
            echo "l.$LINENO: unexpected return code of regex match operator =~, code needs to be fixed" 1>&2
            ;;
    esac
    return 1
}

function handle_macaddr() {
    # - try to set macaddr right here w/ error handlg.
    # device needs to be online
    if debug ifconfig $DEVICE hw ether $MACADDR; then
        return 0
    fi
    echo $"MAC address $MACADDR could not be configured for"
    echo $" $SUBCHANNELS (network device $DEVICE)"
    return 1
}

function question_prefix_macaddr() {
    echo -n $"Unique MAC address"
}

function question_choices_macaddr() {
    echo -n $" (e.g. 02:00:00:00:00:00, ? for help)."
    # for virtual OSAs macaddr is optional and defaults to not specifying one
    if [ -z "${cardtype//OSD_*/}" ]; then
        echo
    else
        echo $" Default is automatic:"
    fi
}

function helptext_macaddr() {
    echo $" Help text for MAC address:"
    echo $"  This is required for real OSA in layer 2 mode."
    echo $"  If connecting to a layer 2 VSWITCH, a MAC address is automatically assigned."
    echo -n $"  You may accept the automatic MAC address with an empty input."
    if [ -z "${cardtype//OSD_*/}" ]; then
        echo
    else
        echo $" [default]"
    fi
    echo $"  You may override the automatic MAC address with non-empty input."
    echo $"  An example MAC address would be: 02:00:00:00:00:00"
}

function exception_macaddr() {
    # for real OSAs macaddr is required
    if [ -n "${cardtype//OSD_*/}" ]; then
        # for virtual OSAs macaddr is optional
        if [ -z "$MACADDR" ]; then
            VSWITCH=1
            break
        fi
    fi
}

function do_macaddr() {
    ask MACADDR \
        question_prefix_macaddr question_choices_macaddr \
        -h helptext_macaddr -e exception_macaddr \
        -s syntax_check_macaddr -c handle_macaddr
}

### CTCPROT

function syntax_check_ctcprot() {
    case "x$CTCPROT" in
        x|x0)
            unset CTCPROT
            return 0
            ;;
        x1|x3)
            return 0
            ;;
        x2)
            echo $"CTC tty's are not usable for this installation (CTCPROT)"
            ;;
        *)
            echo $"Incorrect format or value for CTC protocol (CTCPROT): $CTCPROT"
            ;;
    esac
    return 1
}

function handle_ctcprot() {
    [ -n "$CTCPROT" ] || return 0
    if sysecho /sys/devices/cu3088/${SCH_R_DEVBUSID}/protocol "$CTCPROT"; then
        return 0
    fi
    echo $"Could not configure CTC protocol $CTCPROT for $SUBCHANNELS"
    return 1
}

function question_prefix_ctcprot() {
    echo -n $"CTC protocol"
}

function question_choices_ctcprot() {
    echo $" (0, 1, 3, or ? for help). Default is 0:"
}

function helptext_ctcprot() {
    echo $" Help text for CTC protocol:"
    echo $"  Protocol which should be used for the CTC interface"
    echo $"  0 for compatibility with p.e. VM TCP service machine [default]"
    echo $"  1 for enhanced package checking for Linux peers"
    echo $"  3 for compatibility with OS/390 or z/OS peers"
}

function do_ctcprot() {
    ask CTCPROT \
        question_prefix_ctcprot question_choices_ctcprot \
        -h helptext_ctcprot -s syntax_check_ctcprot -c handle_ctcprot
}

### PORTNAME (LCS portno)

function syntax_check_lcs_portno() {
    [[ "$PORTNAME" =~ ^[[:digit:]]+$ ]]
    case $? in
        0)
            # string matched the pattern
            return 0
            ;;
        1)
            # string did not match the pattern
            ;;
        2)
            echo "l.$LINENO: syntax error in regex of match operator =~, code needs to be fixed" 1>&2
            ;;
        *)
            echo "l.$LINENO: unexpected return code of regex match operator =~, code needs to be fixed" 1>&2
            ;;
    esac
    echo $"Incorrect format for LCS port number (PORTNAME): $PORTNAME"
    return 1
}

function handle_lcs_portno() {
    [ -n "$PORTNAME" ] || return 0
    if sysecho /sys/devices/cu3088/$SCH_R_DEVBUSID/portno "$PORTNAME"; then
        return 0
    fi
    echo $"Could not configure relative port number $PORTNAME for $SUBCHANNELS"
    return 1
}

function question_prefix_lcs_portno() {
    echo -n $"Relative port number of your LCS device"
}

function question_choices_lcs_portno() {
    echo $" (number or ? for help). Default is 0:"
}

function helptext_lcs_portno() {
    echo $" Help text for relative port number of LCS device:"
    echo $"  Required for OSA-Express ATM cards only."
}

function exception_lcs_portno() {
    [ -z "$PORTNAME" ] && break
}

function do_lcs_portno() {
    # LCS portno and QETH portname share the parameter variable PORTNAME.
    # For compatibility with existing parm files we keep this scheme.
    ask PORTNAME \
        question_prefix_lcs_portno question_choices_lcs_portno \
        -e exception_lcs_portno \
        -h helptext_lcs_portno -s syntax_check_lcs_portno -c handle_lcs_portno
}

### PEERID

function syntax_check_peerid() {
    if [ "${#PEERID}" -lt 0 -o "${#PEERID}" -gt 8 ]; then
        echo $"Incorrect string length [0..8] for IUCV connection to peer (PEERID): $PEERID"
        return 1
    fi
    PEERID=`echo $PEERID | tr '[:lower:]' '[:upper:]'`
    [[ "$PEERID" =~ ^[[:alnum:]$]{0,8}$ ]]
    case $? in
        0)
            # string matched the pattern
            return 0
            ;;
        1)
            # string did not match the pattern
            ;;
        2)
            echo "l.$LINENO: syntax error in regex of match operator =~, code needs to be fixed" 1>&2
            ;;
        *)
            echo "l.$LINENO: unexpected return code of regex match operator =~, code needs to be fixed" 1>&2
            ;;
    esac
    echo $"Incorrect format for IUCV connection to peer (PEERID): $PEERID"
    return 1
}

function handle_peerid() {
    if ! sysecho /sys/bus/iucv/drivers/netiucv/connection "$PEERID"; then
        echo $"Could not create new IUCV connection to peer $PEERID"
        return 1
    fi
    # find netiucv with proper guest user ID in
    # /sys/bus/iucv/drivers/netiucv/netiucv[0-9]+/user
    local userpath
    while read userpath; do
        local user
        read user < $userpath
        [ "$user" = "$PEERID" ] && break
    done < <(ls -1 /sys/devices/iucv/netiucv[0-9]*/user 2> /dev/null)
    if [ "$user" != "$PEERID" ]; then
        echo $"Could not find configured connection to peer $PEERID"
        return 1
    fi
    local netiucv=${userpath%%/user}
    netiucv=${netiucv##*/}
    if [ "$netiucv" = "" ]; then
        echo $"Could not get netiucv instance for peer $PEERID"
        return 1
    fi
    if [ ! -h /sys/devices/iucv/${netiucv}/net:* ]; then
        echo $"Device $netiucv does not have required sysfs attribute 'net:*'"
        return 1
    fi
    DEVICE=$(echo /sys/devices/iucv/${netiucv}/net:*)
    DEVICE=${DEVICE//*:/}
    if [ "$DEVICE" = "" ]; then
        echo $"Could not get device name for $netiucv"
        return 1
    fi
    return 0
}

function question_prefix_peerid() {
    echo -n $"Peer ID of the VM guest to connect to"
}

function question_choices_peerid() {
    echo $" (0..8 characters or ? for help):"
}

function helptext_peerid() {
    echo $" Help text for the peer ID of the VM guest you want to connect to:"
    echo $"  User ID of a VM guest you want to connect to."
    echo $"  0..8 alphabetic/numeric characters or dollar-signs '$'."
    echo $"  Your input will be converted to uppercase."
}

function do_peerid() {
    ask PEERID \
        question_prefix_peerid question_choices_peerid \
        -h helptext_peerid -s syntax_check_peerid -c handle_peerid
}

### HOSTNAME

function syntax_check_hostname() {
    syntax_check_domainname "$HOSTNAME" $"Incorrect format for hostname (HOSTNAME): $HOSTNAME"
}

function handle_hostname() {
    if ! hostname $HOSTNAME; then
        echo $"Could not configure hostname $HOSTNAME"
        return 1
    fi
    return 0
}

function question_prefix_hostname() {
    echo -n $"Hostname of your new Linux guest"
}

function question_choices_hostname() {
    echo $" (FQDN e.g. s390.redhat.com or ? for help):"
}

function helptext_hostname() {
            echo $" Help text for hostname:"
            echo $"  Enter the full qualified domain name of your host."
}

function do_hostname() {
    ask HOSTNAME \
        question_prefix_hostname question_choices_hostname \
        -h helptext_hostname -s syntax_check_hostname -c handle_hostname
}

### IPADDR

function syntax_check_ipaddr() {
    unset ipv4
    unset ipv6
    if checkipv4 $IPADDR; then
        ipv4="yes"
        return 0
    elif [ "$ipv6_capable" = "yes" ] && checkipv6 $IPADDR; then
        ipv6="yes"
        return 0
    fi
    echo $"Incorrect format for IP address (IPADDR): $IPADDR"
    return 1
}

function question_prefix_ipaddr() {
    echo -n $"IPv4 address"
    [ "$ipv6_capable" = "yes" ] && echo -n $" / IPv6 addr."
}

function question_choices_ipaddr() {
    echo -n $" (e.g. 10.0.0.2"
    [ "$ipv6_capable" = "yes" ] && echo -n $" / 2001:0DB8::"
    echo $" or ? for help)"
}

function helptext_ipaddr() {
    echo $" Help text for IP address:"
    echo $"  Enter a valid IPv4 address of your new Linux guest (e.g. 10.0.0.2)"
    if [ "$ipv6_capable" = "yes" ]; then
        echo $"  or alternatively a valid IPv6 address without CIDR prefix (e.g. 2001:0DB8::)"
        echo $"  IPv6 is supported on:"
        echo $"   - Ethernet interfaces of the OSA-Express adapter running in QDIO mode."
        echo $"   - HiperSockets layer 2 interfaces"
        [ $(linux_version) -ge $(kernel_version 2 6 26) ] && \
            echo $"   - HiperSockets layer 3 interfaces"
        echo $"   - z/VM guest LAN interfaces running in QDIO mode."
        echo $"  IPv6 is not supported on HiperSocket guest LAN, OSA-Express Token Ring, ATM."
    fi
}

function do_ipaddr() {
    ipv6_capable && ipv6_capable=yes || ipv6_capable=no
    ask IPADDR \
        question_prefix_ipaddr question_choices_ipaddr \
        -h helptext_ipaddr -s syntax_check_ipaddr
    # no handling/configuring of IPADDR yet, since more parameters needed
}

### NETMASK (IPv4)

function syntax_check_netmask_v4() {
    # also support CIDR prefix
    if [[ "$NETMASK" =~ ^[[:digit:]]+$ ]]; then
        if [ "$NETMASK" -ge 1 -a "$NETMASK" -le 32 ]; then
            ipcalc_arg="$IPADDR/$NETMASK"
            return 0
        fi
        echo $"Incorrect value for network prefix [1..32] (NETMASK): $NETMASK"
        return 1
    elif checkipv4 $NETMASK; then
        ipcalc_arg="$IPADDR $NETMASK"
        return 0
    fi
    echo $"Incorrect format or value for network mask (NETMASK): $NETMASK"
    return 1
}

function question_prefix_netmask() {
    echo -n $"IPv4 netmask or CIDR prefix"
}

function hint_netmask_v4() {
    # default based on class a/b/c address
    local a b c d
    IFS=.
    read a b c d <<< "$IPADDR"
    unset IFS
    local ip=$(( ( a << 24 ) + ( b << 16 ) + ( c << 8 ) + ( d ) ))
    # <<EOF convince syntax highlighter that above shifts are no here documents
    if   [ $(( ip & 0x80000000 )) -eq $(( 0x00000000 )) ]; then
        # class a
        echo $"255.0.0.0"
    elif [ $(( ip & 0xC0000000 )) -eq $(( 0x80000000 )) ]; then
        # class b
        echo $"255.255.0.0"
    elif [ $(( ip & 0xE0000000 )) -eq $(( 0xC0000000 )) ]; then
        # class c
        echo $"255.255.255.0"
    else
        # some other class that should not be used as host address
        return 1
    fi
    return 0
}

function question_choices_netmask() {
    echo -n $" (e.g. 255.255.255.0 or 1..32 or ? for help)"
    local default=$(hint_netmask_v4)
    if [ -n "$default" ]; then
        echo $". Default is $default:"
    else
        echo $":"
        echo $"The IP address you entered previously should probably not be used for a host."
    fi
}

function helptext_netmask() {
    echo $" Help text for IPv4 netmask or CIDR prefix:"
    echo $"  Enter a valid IPv4 netmask or CIDR prefix (e.g. 255.255.255.0 or 1..32)"
    local default=$(hint_netmask_v4)
    if [ -n "$default" ]; then
        echo $"  Default is $default"
    else
        echo $"The IP address you entered previously should probably not be used for a host."
    fi
}

function exception_netmask() {
    if [ -z "$NETMASK" ]; then
        NETMASK=$(hint_netmask_v4)
    fi
}

function do_netmask() {
    ask NETMASK \
        question_prefix_netmask question_choices_netmask \
        -h helptext_netmask \
        -s syntax_check_netmask_v4 -e exception_netmask
    # no handling/configuring of NETMASK yet, since more parameters needed
}

### NETMASK (IPv6)

function syntax_check_prefix_v6() {
    if [[ "$NETMASK" =~ ^[[:digit:]]+$ ]]; then
        if [ "$NETMASK" -ge 1 -a "$NETMASK" -le 128 ]; then
            return 0
        fi
    fi
    echo $"Incorrect value for network prefix [1..128] (NETMASK): $NETMASK"
    return 1
}

function question_prefix_netmask_v6() {
    echo -n $"CIDR prefix for the IPv6 address"
}

function question_choices_netmask_v6() {
    echo $" (1..128):"
}

function do_netmask_v6() {
    ask NETMASK \
        question_prefix_netmask_v6 question_choices_netmask_v6 \
        -s syntax_check_prefix_v6
    # no handling/configuring of NETMASK yet, since more parameters needed
}

### GATEWAY (IPv4)

function configure_ipv4_gateway() {
    # FIXME:
    # - Strictly speaking we should first check reachability of gateway
    #   and then configure the gateway route.
    #   This would require a new intermediate workflow_item step
    #   so that the user might continue despite unreachable gateway.
    # done: Only adding default route might add multiple undesired default
    # routes on redoing the parameter item, so delete default route
    # before adding a new one.
    ip -4 route del default dev $DEVICE >& /dev/null
    [ -z "$GATEWAY" ] && return 0
    if ! tv route add default gw $GATEWAY dev $DEVICE; then
        echo $"Could net set default route on device $DEVICE via gateway $GATEWAY"
        return 1
    fi
    # BH FIXME: Workaround for manual MACADDR, need ping to update arp table
    echo $"Trying to reach gateway $GATEWAY..."
    if [ "$NETTYPE" = "ctc" ]; then
        # (virtual) CTC(/A) seems to need some time to get functional
        local i=1
        while : ; do
            ping -c 1 $GATEWAY >& /dev/null && break
            i=$((i+1))
            if [ "$i" -gt 3 ]; then
                echo $"Could not reach gateway $GATEWAY within timeout"
                return 1
            fi
        done
    else
        if ! ping -c 1 $GATEWAY >& /dev/null; then
            echo $"Could not reach your default gateway $GATEWAY"
            return 1
        fi
    fi
    return 0
}

function hint_ipv4_gateway() {
    # - provide default suggestion based on network,
    #   for a class C network this would be either .1 or .254 at the end
    local a b c d
    IFS=.
    read a b c d <<< "$NETWORK"
    unset IFS
    local ip=$(( ( a << 24 ) + ( b << 16 ) + ( c << 8 ) + ( d ) ))
    # <<EOF convince syntax highlighter that above shifts are no here documents
    local lo=$(( ip | 1 ))
    local lo_a=$(( (lo & 0xFF000000) >> 24 ))
    local lo_b=$(( (lo & 0x00FF0000) >> 16 ))
    local lo_c=$(( (lo & 0x0000FF00) >> 8 ))
    local lo_d=$(( (lo & 0x000000FF) ))
    local hi=$(( ip | ( (2**(32 - PREFIX)) - 1 ) ))
    local hi_a=$(( (hi & 0xFF000000) >> 24 ))
    local hi_b=$(( (hi & 0x00FF0000) >> 16 ))
    local hi_c=$(( (hi & 0x0000FF00) >> 8 ))
    local hi_d=$(( (hi & 0x000000FE) ))
    echo $"  Depending on your network design patterns, the default gateway"
    echo $"   might be $lo_a.$lo_b.$lo_c.$lo_d or $hi_a.$hi_b.$hi_c.$hi_d"
}

function question_prefix_gateway() {
    echo -n $"IPv4 address of your default gateway"
}

function question_choices_gateway() {
    echo $" or ? for help:"
}

function helptext_gateway() {
    echo $" Help text for IPv4 default gateway:"
    echo $"  For HiperSockets with internal traffic only you may want to leave this empty"
    echo $"  and choose continue afterwards to go on without gateway."
    hint_ipv4_gateway
}

function finish_gateway() {
    if ! checkipv4 $GATEWAY; then
        # above checkipv4 is silent, so make up for syntax error
        echo $"Incorrect format for IPv4 address of gateway (GATEWAY): $GATEWAY"
        workflow_item_menu
    fi
    if configure_ipv4_gateway; then
        break
    else
        workflow_item_menu && break
    fi
}

# FIXME: allow empty/no gateway?

function do_gateway() {
    ask GATEWAY \
        question_prefix_gateway question_choices_gateway \
        -h helptext_gateway -f finish_gateway
}

### GATEWAY (IPv6)

function configure_ipv6_gateway() {
    # FIXME:
    # - Strictly speaking we should first check reachability of gateway
    #   and then configure the gateway route.
    #   This would require a new intermediate workflow_item step
    #   so that the user might continue despite unreachable gateway.
    # done: Only adding default route might add multiple undesired default
    # routes on redoing the parameter item, so delete default route
    # before adding a new one.
    ip -6 route del default dev $DEVICE >& /dev/null
    [ -z "$GATEWAY" ] && return 0
    # IPv6 http://www.ibiblio.org/pub/Linux/docs/HOWTO/other-formats/html_single/Linux+IPv6-HOWTO.html#AEN1147
    #       ip -6 route add ::/0 dev $DEVICE via $GATEWAY
    # (Could also be learned by autoconfiguration on the link:
    #  after IP address setup and device up,
    #   see if default route has been learned
    #   ip -6 route show | grep ^default
    #  However, we currently use manual IPv6 configuration only.)
    if ! debug ip -6 route add ::/0 dev $DEVICE via $GATEWAY; then
        echo $"Could net set default route on device $DEVICE"
        echo $" via gateway $GATEWAY"
        return 1
    fi
    # BH FIXME: Workaround for manual MACADDR, need ping to update arp table
    echo $"Trying to reach gateway $GATEWAY..."
    if ! ping6 -c 1 $GATEWAY >& /dev/null; then
        echo $"Could not reach your default gateway $GATEWAY"
        return 1
    fi
    return 0
}

function question_prefix_gateway_v6() {
    echo -n $"IPv6 address of your default gateway"
}

function question_choices_gateway_v6() {
    echo $":"
}

function helptext_gateway_v6() {
    echo $" Help text for IPv6 default gateway:"
    echo $"  For HiperSockets with internal traffic only you may want to leave this empty"
    echo $"  and choose continue afterwards to go on without gateway."
}

function finish_gateway_v6() {
    if ! checkipv6 $GATEWAY; then
        # above checkipv6 is silent, so make up for syntax error
        echo $"Incorrect format for IPv6 address of gateway (GATEWAY): $GATEWAY"
        workflow_item_menu
    fi
    if configure_ipv6_gateway; then
        break
    else
        workflow_item_menu && break
    fi
}

# FIXME: allow empty/no gateway?

function do_gateway_v6() {
    ask GATEWAY \
        question_prefix_gateway_v6 question_choices_gateway_v6 \
        -h helptext_gateway_v6 -f finish_gateway_v6
}

### GATEWAY (IPv4, point-to-point)

function configure_ipv4_ptp() {
    # device needs to be online
    if debug ifconfig $DEVICE $IPADDR $MMTU pointopoint $GATEWAY; then
        configure_ipv4_gateway
        return $?
    fi
    echo $"Could not set IPv4 address $IPADDR for device $DEVICE"
    echo $" to peer $GATEWAY"
    [ -n "$MMTU" ] && echo $" and maximum transfer unit: $MMTU"
    return 1
}

function question_prefix_ptp_gateway() {
    echo -n $"IPv4 address of your point-to-point partner"
}

function question_choices_ptp_gateway() {
    echo $" or ? for help:"
    # no hinting possible here
}

function helptext_ptp_gateway() {
    echo $" Help text for point-to-point partner:"
    echo $"  IPv4 address of your CTC / ESCON / IUCV point-to-point partner."
}

function finish_ptp_gateway() {
    if checkipv4 $GATEWAY; then
        if [ "$GATEWAY" = "$IPADDR" ]; then
            echo $"IPv4 address of partner should probably be different from the guest's address"
            workflow_item_menu && break
        else
            break
        fi
    else
        # above checkipv4 is silent, so make up for syntax error
        echo $"Incorrect format for IPv4 address of partner (GATEWAY): $GATEWAY"
        workflow_item_menu && break
    fi
    # too early to actually configure gateway
}

function do_ptp_gateway() {
    ask GATEWAY \
        question_prefix_ptp_gateway question_choices_ptp_gateway \
        -h helptext_ptp_gateway -f finish_ptp_gateway
}

### DNS

function syntax_check_dns() {
    if [ -z "$DNS" ]; then
        echo $"You might encounter problems without a nameserver, especially with FTP installs"
        return 1
    fi
    local dnsitem
    local allgood="yes"
    if [ "$ipv6" ]; then
        while read dnsitem; do
            if ! checkipv6 $dnsitem; then
                echo $"Not a valid IPv6 address for DNS server: $dnsitem"
                allgood="no"
            fi
        done < <(echo $DNS | sed 's/,/\n/g')
    else
         while read dnsitem; do
           if ! checkipv4 $dnsitem; then
                echo $"Not a valid IPv4 address for DNS server: $dnsitem"
                allgood="no"
            fi
         done < <(echo $DNS | sed 's/:/\n/g')
    fi
    if [ "$allgood" = "yes" ]; then
        return 0
    else
        return 1
    fi
}

function handle_dns() {
    # - foreach DNS try if server is reachable by one ping
    [ -z "$DNS" ] && return 0
    local dnsitem
    local allgood="yes"
    echo $"Trying to reach DNS servers..."
    if [ "$ipv6" ]; then
        while read dnsitem; do
            if ! ping6 -c 1 $dnsitem >& /dev/null; then
                echo $"Could not ping DNS server (might still serve DNS requests): $dnsitem"
                allgood="no"
                # this should not be a hard failure since some network
                # environments may prevent pings to DNS servers
                # => prevent workflow_item_menu in kickstart mode
            fi
        done < <(echo $DNS | sed 's/,/\n/g')
    else
        while read dnsitem; do
            # Some network environment may prevent a DNS server from being
            # reachable by ping, so it would make sense to use nslookup.
            # However, nslookup fails with "Resolver Error 0 (no error)"
            # at this stage of the setup progress => not useful
            if ! ping -c 1 $dnsitem >& /dev/null; then
                echo $"Could not ping DNS server: $dnsitem"
#                if nslookup $dnsitem $dnsitem >& /dev/null; then
#                    echo $" but could resolve DNS server with itself: $dnsitem"
#                else
#                    echo $"Could not resolve DNS server with itself: $dnsitem"
#                    allgood="no"
#                fi
#            elif ! nslookup $dnsitem $dnsitem >& /dev/null; then
#                echo $"Could not resolve DNS server with itself: $dnsitem"
                allgood="no"
            fi
        done < <(echo $DNS | sed 's/:/\n/g')
    fi
    if [ "$allgood" = "yes" ]; then
        return 0
    else
        return 1
    fi
}

function question_prefix_dns() {
    if [ "$ipv6" ]; then
        echo -n $"IPv6 addresses of DNS servers"
    else
        echo -n $"IPv4 addresses of DNS servers"
    fi
}

function question_choices_dns() {
    if [ "$ipv6" ]; then
        echo $" (separated by commas ',' or ? for help):"
    else
        echo $" (separated by colons ':' or ? for help):"
    fi
}

function helptext_dns() {
    echo $" Help text for DNS servers:"
    if [ "$ipv6" ]; then
        echo $"  Enter IPv6 addresses of DNS servers separated by commas ','"
    else
        echo $"  Enter IPv4 addresses of DNS servers separated by colons ':'"
    fi
    echo $"  Default are no DNS servers at all."
    echo $"  However, you might encounter problems without a nameserver,"
    echo $"   especially with FTP installs."
    if [ "$ipv6" ]; then
        echo $"  An example with 2 servers would be: 2001:0DB8::42,2001:0DB8::BE:AF"
    else
        echo $"  An example with 2 servers would be: 10.0.0.250:10.1.1.1"
    fi
}

function do_dns() {
    ask DNS \
        question_prefix_dns question_choices_dns \
        -h helptext_dns -s syntax_check_dns -c handle_dns
}

### SEARCHDNS

function syntax_check_searchdns() {
    [ -z "$SEARCHDNS" ] && return 0
    local dnsitem
    local allgood="yes"
    while read dnsitem; do
        syntax_check_domainname "$dnsitem" $"Not a valid DNS search domain: $dnsitem" || allgood="no"
    done < <(echo $SEARCHDNS | sed 's/:/\n/g')
    if [ "$allgood" = "yes" ]; then
        return 0
    else
        return 1
    fi
}

function question_prefix_searchdns() {
    echo -n $"DNS search domains"
}

function question_choices_searchdns() {
    echo $" (separated by colons ':' or ? for help):"
}

function helptext_searchdns() {
    echo $" Help text for DNS search domains:"
    echo $"  Enter search domains according to hostname syntax separated by colons."
    echo $"  Default are no DNS search domains at all."
    echo $"  An example would be: subdomain.domain.com:domain.com"
}

function do_searchdns() {
    ask SEARCHDNS \
        question_prefix_searchdns question_choices_searchdns \
        -h helptext_searchdns -s syntax_check_searchdns
}

### DASD

function parse_dasd() {
    local handle
    [ "$1" = "-h" ] && handle=yes || unset handle
    local dasditem
    local allgood="yes"
    while read dasditem; do
        case $dasditem in
            autodetect|probeonly|nopav) continue ;;
            "") continue ;; # empty range
            *)  local range features
                IFS='('
                read range features <<< "$dasditem"
                unset IFS
                # parse: dev OR dev'-'dev
                local lo=${range%%-*}
                [[ "$lo" =~ (^[[:xdigit:]]+\\.[0-3]\\.[[:xdigit:]]{4}$)|(^[[:xdigit:]]{3,4}$) ]]
                case $? in
                    0)  ;; # string matched the pattern
                    1)  # string did not match the pattern
                        if [ -z "$handle" ]; then
                            echo $"Incorrect format for lower bound of DASD range $range: $lo"
                            allgood="no"
                        fi
                        ;;
                    2)  echo "l.$LINENO: syntax error in regex of match operator =~, code needs to be fixed" 1>&2 ;;
                    *)  echo "l.$LINENO: unexpected return code of regex match operator =~, code needs to be fixed" 1>&2 ;;
                esac
                if [ "${range//*-*/}" = "" ]; then
                    local hi=${range##*-}
                    [[ "$hi" =~ (^[[:xdigit:]]+\\.[0-3]\\.[[:xdigit:]]{4}$)|(^[[:xdigit:]]{3,4}$) ]]
                    case $? in
                        0)  ;; # string matched the pattern
                        1)  # string did not match the pattern
                            if [ -z "$handle" ]; then
                                echo $"Incorrect format for upper bound of DASD range $range: $hi"
                                allgood="no"
                            fi
                            ;;
                        2)  echo "l.$LINENO: syntax error in regex of match operator =~, code needs to be fixed" 1>&2 ;;
                        *)  echo "l.$LINENO: unexpected return code of regex match operator =~, code needs to be fixed" 1>&2 ;;
                    esac
                fi
                if [ "$handle" = "yes" ]; then
                    if ! sysecho /proc/cio_ignore "free $range"; then
                        echo $"Could not free DASD device $range from device blacklist"
                        allgood="no"
                    fi
                fi
                if [ "${features//*)/}" != "" ]; then
                    if [ -z "$handle" ]; then
                        echo $"Missing closing parenthesis at features of DASD range $range: ($features"
                        allgood="no"
                    fi
                fi
                [ -z "$features" ] && continue
                features="${features%)}"
                while read feature; do
                    case $feature in
                        ro|diag|erplog) continue ;;
                        *)  if [ -z "$handle" ]; then
                                echo $"Unknown DASD feature for device range $range: $feature"
                                allgood="no"
                            fi
                            ;;
                    esac
                done < <(echo $features | sed 's/:/\n/g')
                ;;
        esac
    done < <(echo $DASD | sed 's/,/\n/g')
    if [ "$handle" = "yes" ]; then
        udevsettle
        sleep 1
    fi
    if [ "$allgood" = "yes" ]; then
        return 0
    else
        return 1
    fi
}

function syntax_check_dasd() {
    parse_dasd
    return $?
}

function handle_dasd() {
    parse_dasd -h
    return $?
}

function question_prefix_dasd() {
    echo -n $"DASD range"
}

function question_choices_dasd() {
    echo $" (e.g. 200-203,205 or ? for help). Default is autoprobing:"
}

function helptext_dasd() {
    echo $" Help text for DASD range:"
    echo $"  Comma separated list of ranges of device bus IDs."
    echo $"  Default is autoprobing (not recommended)."
    echo $"  Examples would be: 200-203 or 200,201,202,203 or 0.0.0200-0.0.0203,0.0.0205"
}

function exception_dasd() {
    [ -z "$DASD" ] && break
}

function do_dasd() {
    ask DASD \
        question_prefix_dasd question_choices_dasd \
        -h helptext_dasd -e exception_dasd -s syntax_check_dasd -c handle_dasd
}

### FCP

function syntax_check_fcp() {
    local allgood="yes"
    local i
    for i in ${!FCP_*}; do
        local -a fcp
        local devno wwpn lun
        read -a fcp <<< "${!i}"
        case ${#fcp[@]} in
            3)
                devno=${fcp[0]}
                wwpn=${fcp[1]}
                lun=${fcp[2]}
                ;;
            5)
                devno=${fcp[0]}
                wwpn=${fcp[2]}
                lun=${fcp[4]}
                echo $"Deprecated number of FCP arguments (5 instead of 3): "
                echo $" $i=\"${!i}\""
                echo $" should instead be: "
                echo $" $i=\"$devno $wwpn $lun\""
                ;;
            *)
                echo $"Unsupported number of FCP arguments (${#fcp[@]} instead of 3) in:"
                echo $" $i=\"${!i}\""
                allgood="no"
                continue
                ;;
        esac
        [[ "$devno" =~ (^[[:xdigit:]]+\\.[0-3]\\.[[:xdigit:]]{4}$)|(^[[:xdigit:]]{3,4}$) ]]
        case $? in
            0)  ;; # string matched the pattern
            1)  # string did not match the pattern
                echo $"Incorrect format for FCP device $devno in:"
                echo $" $i=\"${!i}\""
                allgood="no"
                ;;
            2)
                echo "l.$LINENO: syntax error in regex of match operator =~, code needs to be fixed" 1>&2
                ;;
            *)
                echo "l.$LINENO: unexpected return code of regex match operator =~, code needs to be fixed" 1>&2
                ;;
        esac
        # zfcp.py:class ZFCPDevice would also accept WWPN without leading 0x
        [[ "$wwpn" =~ ^0x[[:xdigit:]]{16}$ ]]
        case $? in
            0)  ;; # string matched the pattern
            1)  # string did not match the pattern
                echo $"Incorrect format for FCP WWPN $wwpn in:"
                echo $" $i=\"${!i}\""
                allgood="no"
                ;;
            2)  echo "l.$LINENO: syntax error in regex of match operator =~, code needs to be fixed" 1>&2 ;;
            *)  echo "l.$LINENO: unexpected return code of regex match operator =~, code needs to be fixed" 1>&2 ;;
        esac
        # zfcp.py:class ZFCPDevice would also accept LUN without leading 0x
        # zfcp.py:class ZFCPDevice would also accept 16 bit LUN and pads with 0
        [[ "$lun" =~ ^0x[[:xdigit:]]{8}0{8}$ ]]
        case $? in
            0)  ;; # string matched the pattern
            1)  # string did not match the pattern
                echo $"Incorrect format for FCP LUN $lun in:"
                echo $" $i=\"${!i}\""
                allgood="no"
                ;;
            2)
                echo "l.$LINENO: syntax error in regex of match operator =~, code needs to be fixed" 1>&2
                ;;
            *)
                echo "l.$LINENO: unexpected return code of regex match operator =~, code needs to be fixed" 1>&2
                ;;
        esac
    done
    if [ "$allgood" = "yes" ]; then
        return 0
    else
        return 1
    fi
}

###

function show_parms() {
    # The only issue with this stateless approach to showing parameters based
    # on their content being non-empty is, that parameters with defaults
    # such as LAYER2, (PORTNAME,) CTCPROT, PORTNO (,MACADDR) won't be shown
    # if the user just hit enter, so the parm file would be "incomplete".
    # However this is not easy to fix in here, since it would require the
    # inter-parameter dependenies coded below in the main part, e.g. an
    # empty LAYER2 should only be printed with default value if $NETTYPE=qeth.
    # For the time being, at least the parameters LAYER2, PORTNAME, and CTCPROT
    # only get asked on being empty if not running in kickstart mode.
    cat << EOF
NETTYPE=$NETTYPE
IPADDR=$IPADDR
NETMASK=$NETMASK
GATEWAY=$GATEWAY
HOSTNAME=$HOSTNAME
EOF
    [ "$SUBCHANNELS" ] && echo "SUBCHANNELS=$SUBCHANNELS"
    [ "$LAYER2" ] && echo "LAYER2=$LAYER2"
    [ "$VSWITCH" ] && echo "VSWITCH=$VSWITCH"
    [ "$MACADDR" ] && echo "MACADDR=$MACADDR"
    [ "$PORTNAME" ] && echo "PORTNAME=$PORTNAME"
    [ "$PORTNO" ] && echo "PORTNO=$PORTNO"
    [ "$PEERID" ] && echo "PEERID=$PEERID"
    [ "$CTCPROT" ] && echo "CTCPROT=$CTCPROT"
    if [ -n "$mmtu_was_set" ]; then
        echo "MMTU=\"$MMTU\""
    elif [ -n "$mtu_was_set" ]; then
        echo "MTU=$MTU"
    fi
    [ "$DNS" ] && echo "DNS=$DNS"
    [ "$SEARCHDNS" ] && echo "SEARCHDNS=$SEARCHDNS"
    [ "$DASD" ] && echo "DASD=$DASD"
}

function final_check() {
    # final check && break
    if [ -z "$interaction_happened" ]; then
        # if parm file was good enough just continue without interaction
        break
        return 0
    fi
    while : ; do
        # optionally consider "continue" as default
        # but then again the user may inadvertently continue
        echo
        echo $"c) continue, p) parm file/configuration, n) network state, r) restart, s) shell"
        local answer
        read answer
        case $answer in
            c) return 0 ;;
            p) echo
                show_parms ;;
            n) # show interfaces and routing table
                ifconfig -a
                if [ "$ipv6" ]; then
                    #route -n -A inet6
                    # the following produces more compact output for 80 columns
                    ip -6 route show | grep -v "^unreachable "
                else
                    route -n
                fi
                ;;
            r) break ;;
            s) echo $"Enter 'exit' at the shell prompt to get back to the installation dialog."
                /bin/bash
                ;;
    esac
    done
    return 1
}

### MAIN ###

S390ARCH=`uname -m`
if [ "$S390ARCH" = "s390" ]; then
    export S390ARCH="S/390"
else
    export S390ARCH="zSeries"
fi

echo
echo $"Starting the $S390ARCH initrd to configure networking. Version is $VERSION"

# set up env vars as we do in init.c
if [ `uname -m` = "s390x" ]; then
    LD_LIBRARY_PATH=/lib64:/usr/lib64:/usr/X11R6/lib64:/usr/kerberos/lib64:/lib:/usr/lib:/usr/X11R6/lib:/usr/kerberos/lib
else
    LD_LIBRARY_PATH=/lib:/usr/lib:/usr/X11R6/lib:/usr/kerberos/lib
fi
export LD_LIBRARY_PATH

PATH="$PATH:/usr/bin:/bin:/sbin:/usr/sbin:/mnt/sysimage/bin:/mnt/sysimage/usr/bin:/mnt/sysimage/usr/sbin:/mnt/sysimage/sbin:/mnt/sysimage/usr/X11R6/bin"
export PATH
HOME=/
export HOME
PYTHONPATH=/tmp/updates
export PYTHONPATH

if [ -z "$testing" ]; then

    mount -t proc none /proc
    mount -t tmpfs none /dev
    createDevices
    mount -t devpts /dev/pts /dev/pts
    mount -t sysfs none /sys
    # remount root fs rw
    mount /dev/root /  -o remount,rw

    # limit output on x3270 console
    # (console_loglevel of 4 is just right to not get driver info, e.g. from qeth,
    #  since that would mix up with the user dialog)
    echo "4 4 1 7" > /proc/sys/kernel/printk

    # make /tmp/ramfs
    mount -t ramfs none /tmp

    ifconfig lo 127.0.0.1 netmask 255.0.0.0
    route add -host 127.0.0.1 dev lo

    echo -e "127.0.0.1\tlocalhost.localdomain localhost" > /etc/hosts
    echo -e "::1\t\tlocalhost6.localdomain6 localhost6" >> /etc/hosts

    LO=""

    [ -L /sbin/insmod ] && LO=".ko"

    # udevd req'd by udevsettle in readcmsfile, dialog_network_table, and
    # semantic_check_subchannels.
    # (important to start udevd at the right time, e.g. after setup of /dev)
    udevd --daemon

    # Parse configuration
    if [ -n "$CMSDASD" -a -n "$CMSCONFFILE" ]; then
        readcmsfile $CMSDASD $CMSCONFFILE
        source /tmp/$CMSCONFFILE #2>/dev/null
    fi

fi # testing

### MAIN (continuation) ###

if [ -r /sys/firmware/ipl/ipl_type ]; then
    if [ "`cat /sys/firmware/ipl/ipl_type`" = "fcp" ]; then
        while [ 1 ]; do
            echo $"Your IPL device is set to FCP."
            echo $"Would you like to perform a CD-ROM/DVD-ROM installation? (y/n)"
            read do_cd_install
            case $do_cd_install in
                y|Y|[Yy][Ee][Ss])
                    insert_module qdio$LO
                    insert_module scsi_mod$LO
                    insert_module scsi_transport_fc$LO
                    insert_module zfcp$LO
                    CD_DEVICE="`cat /sys/firmware/ipl/device`"
                    WWPN="`cat /sys/firmware/ipl/wwpn`"
                    LUN="`cat /sys/firmware/ipl/lun`"
                    if sysecho /proc/cio_ignore "free $CD_DEVICE"; then
                        udevsettle
                        sleep 1
                    else
                        echo $"Device $CD_DEVICE could not be cleared from device blacklist"
                    fi
                    echo 1 > /sys/bus/ccw/drivers/zfcp/$CD_DEVICE/online
                    [ $? == 0 ] || echo $"Could not set FCP device $CD_DEVICE online"
                    echo $WWPN > /sys/bus/ccw/drivers/zfcp/$CD_DEVICE/port_add
                    [ $? == 0 ] || echo $"Could not add WWPN $WWPN on FCP device $CD_DEVICE"
                    echo $LUN > /sys/bus/ccw/drivers/zfcp/$CD_DEVICE/$WWPN/unit_add
                    [ $? == 0 ] || echo $"Could not add LUN $LUN at WWPN $WWPN on FCP device $CD_DEVICE"
                    break
                    ;;
                n|N|[Nn][Oo])
                    break
                    ;;
                *)
                    echo
                    echo $"*** INVALID ANSWER: $do_cd_install"
                    echo
                    unset do_cd_install
                    ;;
            esac
        done
    fi
fi

# Perform a network installation

[ -n "$MTU" ] && mtu_was_set=$MTU
[ -n "$MMTU" ] && mmtu_was_set=$MMTU
[ -n "$VSWITCH" ] && vswitch_was_set=$VSWITCH

# [ -z "${cardtype//OSD_*/}" ] can be used to check for real OSA

# Parse configuration
# Check for missing parameters, prompt for them if necessary
while : ; do

    # do not show list of possible network device configurations, if:
    # - running unattended install with kickstart
    # - relevant parameters have already been specified in parm file
    #   (a possible optimization would be matching those parms to table entry)
    # - dialog has not been restarted
    [ -n "$reenter" \
        -o -z "$RUNKS" -a \( -z "$NETTYPE" -o -z "$SUBCHANNELS" \) ] && \
        dialog_network_table
    if isVM; then
        echo $"* NOTE: To enter default or empty values press enter twice. *"
    fi
    do_nettype
    tv load_kernel_modules
    # only works, if ipv6 kernel module has been loaded before:
    [ "$NETTYPE" = "qeth" ] && tv disable_ipv6_autoconf
    if [ "$NETTYPE" != "iucv" ]; then
        # all interface types except for iucv have ccw config
        [ -n "$CHANDEV" ] && do_chandev
        do_subchannels
        if [ "$NETTYPE" = "qeth" ]; then
            [ -z "$reenter" -a -n "$RUNKS" -a -z "$PORTNAME" ] || \
                [ -n "${cardtype//OSD_*/}" ] || do_portname
            # See also https://bugzilla.redhat.com/show_bug.cgi?id=439461
            #
            # If running in kickstart mode (unattended), we assume no
            # interaction and the user won't get asked for PORTNO.
            # Otherwise the user will be asked for PORTNO.
            # If the user specified PORTNO in parm/conf file, PORTNO gets
            # respected (or the user will be asked if it was wrong).
            if [ -f /sys/devices/qeth/$SCH_R_DEVBUSID/portno ]; then
                # driver support exists since RHEL5.2
                [ -z "$reenter" -a -n "$RUNKS" -a -z "$PORTNO" ] || \
                    [ -n "${cardtype//OSD_*/}" ] || do_portno
            fi
            do_layer2
            # set device online to know the device name
            # and to know if it's OSD/HiperSocket/GuestLAN BUT do not
            # try to ifconfig the device up since that requires
            # setting the mac address before (if applicable).
            set_device_online || workflow_item_menu noredo
            # MAC address handling is not part of
            # https://bugzilla.redhat.com/show_bug.cgi?id=233376
            # Instead the additions come from
            # https://bugzilla.redhat.com/show_bug.cgi?id=248049
            # The new parms VSWITCH and MACADDR are described in
            # the RHEL 5.1 release notes.
            if isLayer2; then
                if [ -z "$VSWITCH" -o "$VSWITCH" == 0 ]; then
                    do_macaddr
                fi
            fi
        elif [ "$NETTYPE" = "ctc" ]; then
            [ -z "$reenter" -a -n "$RUNKS" -a -z "$CTCPROT" ] || do_ctcprot
            set_device_online || workflow_item_menu noredo
        elif [ "$NETTYPE" = "lcs" ]; then
            [ -n "$RUNKS" -a -z "$PORTNAME" ] && PORTNAME=0
            do_lcs_portno
            set_device_online || workflow_item_menu noredo
        fi
    else # iucv
        do_peerid
    fi

    # device needs to be up before configuring with ifconfig/ip in
    # configure_ipv6_address/configure_ipv4_address/configure_ipv4_address
    set_device_up || workflow_item_menu noredo

    [ "$HOSTNAME" = "(none)" ] && unset HOSTNAME
    do_hostname

    # Note: The workflow_item_menu does a rollback_config on restart
    # dialog, i.e. hardware config has been reset and it is impossible to
    # only restart halfway at IPADDR.
    do_ipaddr
    if [ "$ipv6" ]; then
        # this branch is all IPv6 and at the same time also NETTYPE==qeth
        do_netmask_v6
        handle_mtu
        configure_ipv6_address || workflow_item_menu noredo
        do_gateway_v6
    else
        # Consider IPv4 as default, even for unknown IP versions
        # due to invalid input for IPADDR ignored by the user previously
        # (neither ipv6 nor ipv4 is set).
        # Otherwise we would skip things like NETMASK or GATEWAY
        # and jump forward to DNS which is probably not what we want.
        if [ "$NETTYPE" = "qeth" ] || [ "$NETTYPE" = "lcs" ]; then
            do_netmask
            handle_mtu
            configure_ipv4_address || workflow_item_menu noredo
            do_gateway
        else  # ctc0, iucv0
            if [ -z "$NETMASK" ]; then
                # If the user did not supply netmask, we add the right one.
                # Netmask MUST be present,
                # or pumpSetupInterface() blows routes.
                NETMASK="255.255.255.255"
            fi
            # don't ask for MTU, but use it if set in the parm file
            # don't overwrite MMTU if it has been set for CTC
            [ "$NETTYPE" = "ctc" -a -z "$MTU" -a -z "$MMTU" ] && \
                MMTU="mtu 1500"
            do_ptp_gateway
            configure_ipv4_ptp || workflow_item_menu noredo
        fi
    fi

    modprobe_alias
    do_dns
    [ -n "$DNS" ] && do_searchdns

    do_dasd

    echo $"Initial configuration completed."
    final_check && break
    rollback_config
    reenter="yes"

done # outer dialog loop

#echo $"Starting portmap."
#portmap

if [ -z "$testing" ]; then

    # convert to space-separated lists
    if [ -n "$SEARCHDNS" ]; then
        SEARCHDNS=$(echo $SEARCHDNS |sed -e 's/:/ /g')
        for i in "$SEARCHDNS"; do echo "search $i"; done >> /etc/resolv.conf
    fi
    if [ -n "$DNS" ]; then
        if [ "$ipv6" ]; then
            RESOLVDNS=$(echo $DNS |sed -e 's/,/ /g')
        else
            RESOLVDNS=$(echo $DNS |sed -e 's/:/ /g')
        fi
        for i in $RESOLVDNS; do echo "nameserver $i"; done >> /etc/resolv.conf
    fi

    # make sure we have an /etc/hosts file (required for telnetd)
    if [ ! -z "$HOSTNAME" -a ! -z "$IPADDR" ]; then
        echo -e "$IPADDR\t$HOSTNAME `echo $HOSTNAME | cut -d '.' -f 1`" >> /etc/hosts
    fi

fi # testing

if [ -z "$testing" ]; then
    # undo startup of udevd, only needed it for possible calls of udevsettle
    killall udevd
fi # testing

if [ -n "$DASD" ]; then
    echo "DASD=$DASD" > /tmp/dasd_ports
fi

# syntax check to give user early feedback on parameters provided in parm file
# (he probably won't notice the logs written by anaconda later on)
syntax_check_fcp
# currently we ignore failed syntax checks since FCP parms are non-interactive
for i in ${!FCP_*}; do
    echo "${!i}" >> /tmp/fcpconfig
done
# cio_ignore handling for FCP should happen when the content of /tmp/fcpconfig
# will actually be processed which is in anaconda's zfcp.py ZFCP::readConfig()

if [ -z "$testing" ]; then

    grep -q ext3 /proc/filesystems
    if [ "$?" != "0" ]; then
        insmod jbd$LO
        insmod ext3$LO
    fi

fi # testing

# TODO/FIXME: also need to pass IPv6 decision to loader/anaconda
#    [ "$ipv6" ] && echo "IPV6=yes"

# transfer options into install environment
cat > /tmp/install.cfg << EOF
LANG="$LANG"
S390ARCH="$S390ARCH"
TEXTDOMAIN="$TEXTDOMAIN"
TEXTDOMAINDIR="$TEXTDOMAINDIR"
PORTNAME="$PORTNAME"
HOSTNAME="$HOSTNAME"
DEVICE="$DEVICE"
NETTYPE="$NETTYPE"
IPADDR="$IPADDR"
GATEWAY="$GATEWAY"
MTU="$MTU"
NETWORK="$NETWORK"
NETMASK="$NETMASK"
BROADCAST="$BROADCAST"
SEARCHDNS="$SEARCHDNS"
PEERID="$PEERID"
SUBCHANNELS="$SUBCHANNELS"
ONBOOT="yes"
CTCPROT="$CTCPROT"
EOF
if [ "$ipv6" ]; then
    echo DNS=\"`echo $DNS | cut -d ',' -f 1`\" >> /tmp/install.cfg
else
    echo DNS=\"`echo $DNS | cut -d ':' -f 1`\" >> /tmp/install.cfg
fi
cat >> /tmp/install.cfg << EOF
export LANG PORTNAME S390ARCH TEXTDOMAIN TEXTDOMAINDIR
export HOSTNAME DEVICE NETTYPE IPADDR GATEWAY MTU
export NETWORK NETMASK BROADCAST DNS SEARCHDNS
export PEERID ONBOOT SUBCHANNELS CTCPROT
EOF
# immediately read it in again to export these into the shell below
. /tmp/install.cfg
if [ -z "$testing" ]; then
    cat /tmp/install.cfg >> /etc/profile
fi # testing
cat > /tmp/netinfo << EOF
DEVICE=$DEVICE
ONBOOT=yes
BOOTPROTO=static
GATEWAY=$GATEWAY
BROADCAST=$BROADCAST
HOSTNAME=$HOSTNAME
MTU=$MTU
SUBCHANNELS=$SUBCHANNELS
EOF
if [ "$ipv6" ]; then
    [ "$DNS" != "" ] && echo "DNS=`echo $DNS | cut -d ',' -f 1`" >> /tmp/netinfo
else
    [ "$DNS" != "" ] && echo "DNS=`echo $DNS | cut -d ':' -f 1`" >> /tmp/netinfo
fi
[ "$NETTYPE" != "" ] && echo "NETTYPE=$NETTYPE" >> /tmp/netinfo
[ "$PEERID" != "" ] && echo "PEERID=$PEERID" >> /tmp/netinfo
[ "$PORTNAME" != "" ] && echo "PORTNAME=$PORTNAME" >> /tmp/netinfo
[ "$CTCPROT" != "" ] && echo "CTCPROT=$CTCPROT" >> /tmp/netinfo
[ "$LAYER2" != "" ] && echo "LAYER2=$LAYER2" >> /tmp/netinfo
[ "$MACADDR" != "" ] && echo "MACADDR=$MACADDR" >> /tmp/netinfo
[ "$PORTNO" != "" ] && echo "PORTNO=$PORTNO" >> /tmp/netinfo
# also needs support in stage2 to make PORTNO persistent,
# i.e. OPTION="portno=1" in /etc/sysconfig/network-scripts/ifcfg-<netdevname>
# this is done by the loader starting with RHEL 5.3
if [ "$ipv6" ]; then
    cat >> /tmp/netinfo << EOF
IPV6INIT=yes
IPV6_AUTOCONF=no
IPV6ADDR=$IPADDR/$NETMASK
EOF
    # FIXME: /etc/sysconfig/network:IPV6_DEFAULTGW=$GATEWAY
    #        /etc/sysconfig/network:NETWORKING_IPV6=yes
else
    cat >> /tmp/netinfo << EOF
IPADDR=$IPADDR
NETMASK=$NETMASK
EOF
fi

if [ -z "$testing" ]; then

    # so that the vars get propagated into the sshd shells
    mkdir /.ssh
    cat >> /.ssh/environment <<EOF
LD_LIBRARY_PATH=$LD_LIBRARY_PATH
PATH=$PATH
HOME=$HOME
PYTHONPATH=$PYTHONPATH
EOF

    cat >> /etc/profile <<EOF
LD_LIBRARY_PATH=$LD_LIBRARY_PATH
PATH=$PATH
HOME=$HOME
PYTHONPATH=$PYTHONPATH
export LD_LIBRARY_PATH PATH HOME PYTHONPATH
EOF

    if [ -n "$DISPLAY" ]; then
        echo "export DISPLAY=$DISPLAY" >> /etc/profile
    fi

    # I'm tired of typing this out...
    echo "loader" >> /.bash_history

    echo -n $$ > /var/run/init.pid

    # shutdown (halt) on SIGUSR1
    trap doshutdown SIGUSR1
    # reboot on SIGUSR2
    trap doreboot SIGUSR2

    startinetd

    if [ -n "$RUNKS" ]; then
        /sbin/loader
    fi

    doreboot

fi # testing

# ;;; Local Variables: ***
# ;;; mode: sh ***
# ;;; end: ***