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
|
/* This inspects a block device and produces an XML representation of
* the partitions, LVM, filesystems that we find there. This could be
* useful as example code of how to do this sort of probing, or to
* feed the XML to other programs.
*
* Usage:
* to-xml guest.img [guest.img ...]
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <inttypes.h>
#include <unistd.h>
#include <ctype.h>
#include <guestfs.h>
/* Note that if any API call fails, we can just exit. The
* standard error handler will have printed the error message
* to stderr already.
*/
#define CALL(call,errcode) \
if ((call) == (errcode)) exit (1);
static void display_partition (guestfs_h *g, const char *dev);
static void display_partitions (guestfs_h *g, const char *dev);
static void display_ext234 (guestfs_h *g, const char *dev, const char *fstype);
int
main (int argc, char *argv[])
{
guestfs_h *g;
int i;
if (argc < 2 || access (argv[1], F_OK) != 0) {
fprintf (stderr, "Usage: to-xml guest.img [guest.img ...]\n");
exit (1);
}
if (!(g = guestfs_create ())) {
fprintf (stderr, "Cannot create libguestfs handle.\n");
exit (1);
}
for (i = 1; i < argc; ++i)
CALL (guestfs_add_drive (g, argv[i]), -1);
CALL (guestfs_launch (g), -1);
printf ("<guestfs-system>\n");
/* list-devices should return the devices that we just attached?
* Better to find out what the kernel thinks are devices anyway ...
*/
char **devices;
CALL (devices = guestfs_list_devices (g), NULL);
printf ("<devices>\n");
for (i = 0; devices[i] != NULL; ++i) {
int64_t size;
CALL (size = guestfs_blockdev_getsize64 (g, devices[i]), -1);
printf ("<device dev=\"%s\" size=\"%" PRIi64 "\">\n", devices[i], size);
display_partitions (g, devices[i]);
free (devices[i]);
printf ("</device>\n");
}
free (devices);
printf ("</devices>\n");
/* Now do the same for VGs and LVs. Note that a VG may span
* multiple PVs / block devices, in arbitrary ways, which is
* why VGs are in a separate top-level XML class.
*/
char **vgs;
char **lvs;
printf ("<volgroups>\n");
CALL (vgs = guestfs_vgs (g), NULL);
CALL (lvs = guestfs_lvs (g), NULL);
for (i = 0; vgs[i] != NULL; ++i) {
printf ("<volgroup name=\"%s\">\n", vgs[i]);
/* Just the LVs in this VG. */
int len = strlen (vgs[i]);
int j;
for (j = 0; lvs[j] != NULL; ++j) {
if (strncmp (lvs[j], "/dev/", 5) == 0 &&
strncmp (&lvs[j][5], vgs[i], len) == 0 &&
lvs[j][len+5] == '/') {
int64_t size;
CALL (size = guestfs_blockdev_getsize64 (g, lvs[j]), -1);
printf ("<logvol name=\"%s\" size=\"%" PRIi64 "\">\n", lvs[j], size);
display_partition (g, lvs[j]);
printf ("</logvol>\n");
free (lvs[j]);
}
}
free (vgs[i]);
printf ("</volgroup>\n");
}
free (vgs);
free (lvs);
printf ("</volgroups>\n");
guestfs_close (g);
printf ("</guestfs-system>\n");
return 0;
}
/* Display a partition or LV. */
static void
display_partition (guestfs_h *g, const char *dev)
{
char *what;
CALL (what = guestfs_file (g, dev), NULL);
if (strcmp (what, "x86 boot sector") == 0)
/* This is what 'file' program shows for Windows/NTFS partitions. */
printf ("<windows/>\n");
else if (strstr (what, "boot sector") != NULL)
display_partitions (g, dev);
else if (strncmp (what, "LVM2", 4) == 0)
printf ("<physvol/>\n");
else if (strstr (what, "ext2 filesystem data") != NULL)
display_ext234 (g, dev, "ext2");
else if (strstr (what, "ext3 filesystem data") != NULL)
display_ext234 (g, dev, "ext3");
else if (strstr (what, "ext4 filesystem data") != NULL)
display_ext234 (g, dev, "ext4");
else if (strstr (what, "Linux/i386 swap file") != NULL)
printf ("<linux-swap/>\n");
else
printf ("<unknown/>\n");
free (what);
}
/* Display an MBR-formatted boot sector. */
static void
display_partitions (guestfs_h *g, const char *dev)
{
/* We can't look into a boot sector which is an LV or partition.
* That's a limitation of sorts of the Linux kernel. (Actually,
* we could do this if we add the kpartx program to libguestfs).
*/
if (strncmp (dev, "/dev/sd", 7) != 0 || isdigit (dev[strlen(dev)-1])) {
printf ("<vm-image dev=\"%s\"/>\n", dev);
return;
}
char **parts;
int i, len;
CALL (parts = guestfs_list_partitions (g), NULL);
printf ("<partitions>\n");
len = strlen (dev);
for (i = 0; parts[i] != NULL; ++i) {
/* Only display partition if it's in the device. */
if (strncmp (parts[i], dev, len) == 0) {
int64_t size;
CALL (size = guestfs_blockdev_getsize64 (g, parts[i]), -1);
printf ("<partition dev=\"%s\" size=\"%" PRIi64 "\">\n", parts[i], size);
display_partition (g, parts[i]);
printf ("</partition>\n");
}
free (parts[i]);
}
free (parts);
printf ("</partitions>\n");
}
/* Display some details on the ext2/3/4 filesystem on dev. */
static void
display_ext234 (guestfs_h *g, const char *dev, const char *fstype)
{
char **sbfields;
int i;
printf ("<fs type=\"%s\">\n", fstype);
CALL (sbfields = guestfs_tune2fs_l (g, dev), NULL);
for (i = 0; sbfields[i] != NULL; i += 2) {
/* Just pick out a few important fields to display. There
* is much more that could be displayed here.
*/
if (strcmp (sbfields[i], "Filesystem UUID") == 0)
printf ("<uuid>%s</uuid>\n", sbfields[i+1]);
else if (strcmp (sbfields[i], "Block size") == 0)
printf ("<blocksize>%s</blocksize>\n", sbfields[i+1]);
free (sbfields[i]);
free (sbfields[i+1]);
}
free (sbfields);
printf ("</fs>\n");
}
|
