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
|
/* Demonstrate the use of the 'mount-local' API.
*
* Run this program as (eg) mount-local /tmp/test.img. Note that
* '/tmp/test.img' is created or overwritten. Follow the instructions
* on screen.
*
* See "MOUNT LOCAL" in guestfs(3).
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <guestfs.h>
#ifndef O_CLOEXEC
#define O_CLOEXEC 0
#endif
/* Define a list of filesystem mount options (used on the libguestfs
* side, nothing to do with FUSE). An empty string may be used here
* instead.
*/
#define MOUNT_OPTIONS "acl,user_xattr"
/* Size of the disk (megabytes). */
#define SIZE_MB 512
static void
usage (void)
{
fprintf (stderr,
"Usage: mount-local disk.img\n"
"\n"
"NOTE: disk.img will be created or overwritten.\n"
"\n");
}
int
main (int argc, char *argv[])
{
guestfs_h *g;
int r;
char tempdir[] = "/tmp/mlXXXXXX";
pid_t pid;
char *shell, *p;
if (argc != 2) {
usage ();
exit (EXIT_FAILURE);
}
if (argv[1][0] == '-') {
usage ();
exit (EXIT_FAILURE);
}
printf ("\n"
"This is the 'mount-local' demonstration program. Follow the\n"
"instructions on screen.\n"
"\n"
"Creating and formatting the disk image, please wait a moment ...\n");
fflush (stdout);
/* Guestfs handle. */
g = guestfs_create ();
if (g == NULL) {
perror ("could not create libguestfs handle");
exit (EXIT_FAILURE);
}
/* Create the output disk image: raw sparse. */
if (guestfs_disk_create (g, argv[1], "raw", SIZE_MB * 1024 * 1024, -1) == -1)
exit (EXIT_FAILURE);
/* Create the disk image and format it with a partition and a filesystem. */
if (guestfs_add_drive_opts (g, argv[1],
GUESTFS_ADD_DRIVE_OPTS_FORMAT, "raw",
-1) == -1)
exit (EXIT_FAILURE);
if (guestfs_launch (g) == -1)
exit (EXIT_FAILURE);
if (guestfs_part_disk (g, "/dev/sda", "mbr") == -1)
exit (EXIT_FAILURE);
if (guestfs_mkfs (g, "ext2", "/dev/sda1") == -1)
exit (EXIT_FAILURE);
/* Mount the empty filesystem. */
if (guestfs_mount_options (g, MOUNT_OPTIONS, "/dev/sda1", "/") == -1)
exit (EXIT_FAILURE);
/* Create a file in the new filesystem. */
if (guestfs_touch (g, "/PUT_FILES_AND_DIRECTORIES_HERE") == -1)
exit (EXIT_FAILURE);
/* Create a temporary mount directory. */
if (mkdtemp (tempdir) == NULL) {
perror ("mkdtemp");
exit (EXIT_FAILURE);
}
/* Mount the filesystem. */
if (guestfs_mount_local (g, tempdir, -1) == -1)
exit (EXIT_FAILURE);
/* Fork the shell for the user. */
pid = fork ();
if (pid == -1) {
perror ("fork");
exit (EXIT_FAILURE);
}
if (pid == 0) { /* Child. */
if (chdir (tempdir) == -1) {
perror (tempdir);
_exit (EXIT_FAILURE);
}
printf ("\n"
"The *current directory* is a FUSE filesystem backed by the disk\n"
"image which is managed by libguestfs. Any files or directories\n"
"you copy into here (up to %d MB) will be saved into the disk\n"
"image. You can also delete files, create certain special files\n"
"and so on.\n"
"\n"
"When you have finished adding files, hit ^D or type 'exit' to\n"
"exit the shell and return to the mount-local program.\n"
"\n",
SIZE_MB);
shell = getenv ("SHELL");
if (!shell)
r = system ("/bin/sh");
else {
/* Set a magic prompt. We only know how to do this for bash. */
p = strrchr (shell, '/');
if (p && strcmp (p+1, "bash") == 0) {
const size_t len = 64 + strlen (shell);
char *buf;
buf = malloc (len);
if (buf == NULL) {
perror ("malloc");
_exit (EXIT_FAILURE);
}
snprintf (buf, len, "PS1='mount-local-shell> ' %s --norc -i", shell);
r = system (buf);
free (buf);
} else
r = system (shell);
}
if (r == -1) {
fprintf (stderr, "error: failed to run sub-shell (%s) "
"(is $SHELL set correctly?)\n",
shell);
//FALLTHROUGH
}
if (chdir ("/") == -1)
perror ("chdir: /");
guestfs_umount_local (g, GUESTFS_UMOUNT_LOCAL_RETRY, 1, -1);
_exit (EXIT_SUCCESS);
}
/* Note that we are *not* waiting for the child yet. We want to
* run the FUSE code in parallel with the subshell.
*/
/* We're going to hide libguestfs errors here, but in a real program
* you would probably want to log them somewhere.
*/
guestfs_push_error_handler (g, NULL, NULL);
/* Now run the FUSE thread. */
if (guestfs_mount_local_run (g) == -1)
exit (EXIT_FAILURE);
guestfs_pop_error_handler (g);
waitpid (pid, NULL, 0);
/* Shutdown the handle explicitly so write errors can be detected. */
if (guestfs_shutdown (g) == -1)
exit (EXIT_FAILURE);
guestfs_close (g);
printf ("\n"
"Any files or directories that you copied in have been saved into\n"
"the disk image called '%s'.\n"
"\n"
"Try opening the disk image with guestfish to see those files:\n"
"\n"
" guestfish -a %s -m /dev/sda1\n"
"\n",
argv[1], argv[1]);
exit (EXIT_SUCCESS);
}
|
