/usr/share/doc/libguestfs-dev/examples/display-icon.c is in libguestfs-dev 1:1.24.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | /* This example inspects a guest using libguestfs inspection (see
* "INSPECTION" in guestfs(3)), and if possible displays a
* representative icon or logo for the guest's operating system.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <guestfs.h>
static int
compare_keys_len (const void *p1, const void *p2)
{
const char *key1 = * (char * const *) p1;
const char *key2 = * (char * const *) p2;
return strlen (key1) - strlen (key2);
}
static size_t
count_strings (char *const *argv)
{
size_t c;
for (c = 0; argv[c]; ++c)
;
return c;
}
int
main (int argc, char *argv[])
{
guestfs_h *g;
const char *disk;
char **roots, *root, **mountpoints, *icon;
size_t i, j, icon_size;
FILE *fp;
if (argc != 2) {
fprintf (stderr, "usage: display-icon disk.img\n");
exit (EXIT_FAILURE);
}
disk = argv[1];
g = guestfs_create ();
if (g == NULL) {
perror ("failed to create libguestfs handle");
exit (EXIT_FAILURE);
}
/* Attach the disk image read-only to libguestfs. */
if (guestfs_add_drive_opts (g, disk,
/* GUESTFS_ADD_DRIVE_OPTS_FORMAT, "raw", */
GUESTFS_ADD_DRIVE_OPTS_READONLY, 1,
-1) /* this marks end of optional arguments */
== -1)
exit (EXIT_FAILURE);
/* Run the libguestfs back-end. */
if (guestfs_launch (g) == -1)
exit (EXIT_FAILURE);
/* Ask libguestfs to inspect for operating systems. */
roots = guestfs_inspect_os (g);
if (roots == NULL)
exit (EXIT_FAILURE);
if (roots[0] == NULL) {
fprintf (stderr, "display-icon: no operating systems found\n");
exit (EXIT_FAILURE);
}
for (j = 0; roots[j] != NULL; ++j) {
root = roots[j];
/* Mount up the disks, like guestfish -i.
*
* Sort keys by length, shortest first, so that we end up
* mounting the filesystems in the correct order.
*/
mountpoints = guestfs_inspect_get_mountpoints (g, root);
if (mountpoints == NULL)
exit (EXIT_FAILURE);
qsort (mountpoints, count_strings (mountpoints) / 2, 2 * sizeof (char *),
compare_keys_len);
for (i = 0; mountpoints[i] != NULL; i += 2) {
/* Ignore failures from this call, since bogus entries can
* appear in the guest's /etc/fstab.
*/
guestfs_mount_ro (g, mountpoints[i+1], mountpoints[i]);
free (mountpoints[i]);
free (mountpoints[i+1]);
}
free (mountpoints);
/* Get the icon.
* This function returns a buffer ('icon'). Normally it is a png
* file, returned as a string, but it can also be a zero length
* buffer which has a special meaning, or NULL which means there
* was an error.
*/
icon = guestfs_inspect_get_icon (g, root, &icon_size, -1);
if (!icon) /* actual libguestfs error */
exit (EXIT_FAILURE);
if (icon_size == 0) /* no icon available */
fprintf (stderr, "%s: %s: no icon available for this operating system\n",
disk, root);
else {
/* Display the icon. */
fp = popen ("display -", "w");
if (fp == NULL) {
perror ("display");
exit (EXIT_FAILURE);
}
if (fwrite (icon, 1, icon_size, fp) != icon_size) {
perror ("write");
exit (EXIT_FAILURE);
}
if (pclose (fp) == -1) {
perror ("pclose");
exit (EXIT_FAILURE);
}
}
free (icon);
/* Unmount everything. */
if (guestfs_umount_all (g) == -1)
exit (EXIT_FAILURE);
free (root);
}
free (roots);
guestfs_close (g);
exit (EXIT_SUCCESS);
}
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