Public bug reported:
Seen on several versions of glib2 and Ubuntu:
12.10 - amd64
libglib2.0-0:amd64 2.34.1-1ubuntu1
12.04 armhf
libglib2.0-0 2.32.3-0ubuntu1
g_unix_mount_points_get() returns an empty list when run inside an LXC
container. I think this is because it reads /etc/fstab to gather mount
info instead of reading /proc/mounts. This means that for LXC
containers, it will fail using a default container, returning no mount
points. There are other cases where fstab is neither complete up to date
or accurate and I think that reading mounts would make more sense. Below
is a repro case.
/* gcc -g -ggdb -o dt dt.c `pkg-config --cflags --libs glib-2.0
libgtop-2.0 gio-2.0 gio-unix-2.0` */
/* g_unix_mount_points_get() - returns empty set inside a container */
#include <glib.h>
#include <gio/gio.h>
#include <gio/gunixmounts.h>
#include <stdio.h>
#include <stdlib.h>
int main(void) {
GList *points;
GList *p;
points = g_unix_mount_points_get (NULL);
if (points == NULL) {
printf("no mounts found!");
}
for (p = points; p != NULL; p = p->next)
{
GUnixMountEntry *mount = p->data;
const char *mount_path;
mount_path = g_unix_mount_get_mount_path (mount);
printf("Found a mount: %s\n", mount_path);
}
g_list_free (points);
}
** Affects: glib2.0 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1136542
Title:
g_unix_mount_points_get() won't work in a LXC container unless
/etc/fstab is set
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