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xbps-uunshare: do not fail if /proc/self/setgroups does not exist.

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3.16 supports user_namespaces(7) but does not have /proc/self/setgroups.

Found by @cheneukirchen.
This commit is contained in:
Juan RP
2015-03-09 12:34:57 +01:00
parent be363d93f5
commit 1597727814
2 changed files with 8 additions and 6 deletions
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11
bin/xbps-uunshare/main.c
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@ -147,12 +147,11 @@ main(int argc, char **argv)
close(fd);
if ((fd = open("/proc/self/setgroups", O_RDWR)) == -1)
die("failed to open /proc/self/setgroups rw");
if (write(fd, "deny", 4) == -1)
die("failed to write to /proc/self/setgroups");
close(fd);
if ((fd = open("/proc/self/setgroups", O_RDWR)) == 0) {
if (write(fd, "deny", 4) == -1)
die("failed to write to /proc/self/setgroups");
close(fd);
}
if ((fd = open("/proc/self/gid_map", O_RDWR)) == -1)
die("failed to open /proc/self/gid_map rw");