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
|
/* libguestfs - the guestfsd daemon
* Copyright (C) 2009-2010 Red Hat Inc.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include "read-file.h"
#include "guestfs_protocol.h"
#include "daemon.h"
#include "actions.h"
#include "optgroups.h"
int
optgroup_xz_available (void)
{
return prog_exists ("xz");
}
/* Redirect errors from the tar command to the error file, then
* provide functions for reading it in. We overwrite the file each
* time, and since it's small and stored on the appliance we don't
* bother to delete it.
*/
static const char *error_file = "/tmp/error";
static char *
read_error_file (void)
{
size_t len;
char *str = read_file (error_file, &len);
if (str == NULL) {
str = strdup ("(no error)");
if (str == NULL) {
perror ("strdup");
exit (EXIT_FAILURE);
}
len = strlen (str);
}
/* Remove trailing \n character if any. */
if (len > 0 && str[len-1] == '\n')
str[--len] = '\0';
return str; /* caller frees */
}
static int
write_cb (void *fd_ptr, const void *buf, size_t len)
{
int fd = *(int *)fd_ptr;
return xwrite (fd, buf, len);
}
/* Has one FileIn parameter. */
static int
do_tXz_in (const char *dir, const char *filter)
{
int err, r;
FILE *fp;
char *cmd;
/* "tar -C /sysroot%s -xf -" but we have to quote the dir. */
if (asprintf_nowarn (&cmd, "tar -C %R -%sxf - 2> %s",
dir, filter, error_file) == -1) {
err = errno;
r = cancel_receive ();
errno = err;
reply_with_perror ("asprintf");
return -1;
}
if (verbose)
fprintf (stderr, "%s\n", cmd);
fp = popen (cmd, "w");
if (fp == NULL) {
err = errno;
r = cancel_receive ();
errno = err;
reply_with_perror ("%s", cmd);
free (cmd);
return -1;
}
free (cmd);
/* The semantics of fwrite are too undefined, so write to the
* file descriptor directly instead.
*/
int fd = fileno (fp);
r = receive_file (write_cb, &fd);
if (r == -1) { /* write error */
cancel_receive ();
char *errstr = read_error_file ();
reply_with_error ("write error on directory: %s: %s", dir, errstr);
free (errstr);
pclose (fp);
return -1;
}
if (r == -2) { /* cancellation from library */
/* This error is ignored by the library since it initiated the
* cancel. Nevertheless we must send an error reply here.
*/
reply_with_error ("file upload cancelled");
pclose (fp);
return -1;
}
if (pclose (fp) != 0) {
char *errstr = read_error_file ();
reply_with_error ("tar subcommand failed on directory: %s: %s",
dir, errstr);
free (errstr);
return -1;
}
return 0;
}
/* Has one FileIn parameter. */
int
do_tar_in (const char *dir)
{
return do_tXz_in (dir, "");
}
/* Has one FileIn parameter. */
int
do_tgz_in (const char *dir)
{
return do_tXz_in (dir, "z");
}
/* Has one FileIn parameter. */
int
do_txz_in (const char *dir)
{
return do_tXz_in (dir, "J");
}
/* Has one FileOut parameter. */
static int
do_tXz_out (const char *dir, const char *filter)
{
int r;
FILE *fp;
char *cmd;
char buf[GUESTFS_MAX_CHUNK_SIZE];
/* "tar -C /sysroot%s -zcf - ." but we have to quote the dir. */
if (asprintf_nowarn (&cmd, "tar -C %R -%scf - .", dir, filter) == -1) {
reply_with_perror ("asprintf");
return -1;
}
if (verbose)
fprintf (stderr, "%s\n", cmd);
fp = popen (cmd, "r");
if (fp == NULL) {
reply_with_perror ("%s", cmd);
free (cmd);
return -1;
}
free (cmd);
/* Now we must send the reply message, before the file contents. After
* this there is no opportunity in the protocol to send any error
* message back. Instead we can only cancel the transfer.
*/
reply (NULL, NULL);
while ((r = fread (buf, 1, sizeof buf, fp)) > 0) {
if (send_file_write (buf, r) < 0) {
pclose (fp);
return -1;
}
}
if (ferror (fp)) {
perror (dir);
send_file_end (1); /* Cancel. */
pclose (fp);
return -1;
}
if (pclose (fp) != 0) {
perror (dir);
send_file_end (1); /* Cancel. */
return -1;
}
if (send_file_end (0)) /* Normal end of file. */
return -1;
return 0;
}
/* Has one FileOut parameter. */
int
do_tar_out (const char *dir)
{
return do_tXz_out (dir, "");
}
/* Has one FileOut parameter. */
int
do_tgz_out (const char *dir)
{
return do_tXz_out (dir, "z");
}
/* Has one FileOut parameter. */
int
do_txz_out (const char *dir)
{
return do_tXz_out (dir, "J");
}
|
