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Populate /dev/std{in,out,err} symlinks in LXC containers

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Some applications expect /dev/std{in,out,err} to exist. Populate
them during container startup as symlinks to /proc/self/fd
This commit is contained in:
Daniel P. Berrange 2012-02-08 14:21:28 +00:00
parent bc6bb3a3e8
commit d474dbadde
1 changed files with 18 additions and 0 deletions
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18
src/lxc/lxc_container.c
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@ -584,6 +584,15 @@ static int lxcContainerPopulateDevices(char **ttyPaths, size_t nttyPaths)
{ LXC_DEV_MAJ_MEMORY, LXC_DEV_MIN_RANDOM, 0666, "/dev/random" },
{ LXC_DEV_MAJ_MEMORY, LXC_DEV_MIN_URANDOM, 0666, "/dev/urandom" },
};
const struct {
const char *src;
const char *dst;
} links[] = {
{ "/proc/self/fd/0", "/dev/stdin" },
{ "/proc/self/fd/1", "/dev/stdout" },
{ "/proc/self/fd/2", "/dev/stderr" },
{ "/proc/self/fd", "/dev/fd" },
};
/* Populate /dev/ with a few important bits */
for (i = 0 ; i < ARRAY_CARDINALITY(devs) ; i++) {
@ -597,6 +606,15 @@ static int lxcContainerPopulateDevices(char **ttyPaths, size_t nttyPaths)
}
}
for (i = 0 ; i < ARRAY_CARDINALITY(links) ; i++) {
if (symlink(links[i].src, links[i].dst) < 0) {
virReportSystemError(errno,
_("Failed to symlink device %s to %s"),
links[i].dst, links[i].src);
return -1;
}
}
if (access("/dev/pts/ptmx", W_OK) == 0) {
/* We have private devpts capability, so bind that */
if (virFileTouch("/dev/ptmx", 0666) < 0)