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start: open /dev/null from "host" /dev

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Sometimes, a container doesn't have /dev/null.
For example, I have this problem with Android container.

This fixes #910 (github) for me.

Signed-off-by: Aleksandr Mezin <mezin.alexander@gmail.com>
This commit is contained in:
Aleksandr Mezin 2016-03-24 23:22:32 +06:00
parent f8dd027559
commit c44de748af
1 changed files with 20 additions and 2 deletions
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22
src/lxc/start.c
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@ -710,6 +710,7 @@ static int do_start(void *data)
{
struct lxc_list *iterator;
struct lxc_handler *handler = data;
int devnull_fd = -1;
if (sigprocmask(SIG_SETMASK, &handler->oldmask, NULL)) {
SYSERROR("failed to set sigprocmask");
@ -788,6 +789,13 @@ static int do_start(void *data)
}
#endif
if (handler->backgrounded) {
devnull_fd = open_devnull();
if (devnull_fd < 0)
goto out_warn_father;
}
/* Setup the container, ip, names, utsname, ... */
if (lxc_setup(handler)) {
ERROR("failed to setup the container");
@ -796,7 +804,7 @@ static int do_start(void *data)
/* ask father to setup cgroups and wait for him to finish */
if (lxc_sync_barrier_parent(handler, LXC_SYNC_CGROUP))
return -1;
goto out_error;
/* Set the label to change to when we exec(2) the container's init */
if (lsm_process_label_set(NULL, handler->conf, 1, 1) < 0)
@ -853,9 +861,14 @@ static int do_start(void *data)
close(handler->sigfd);
if (handler->backgrounded && null_stdfds() < 0)
if (handler->backgrounded && set_stdfds(devnull_fd))
goto out_warn_father;
if (devnull_fd >= 0) {
close(devnull_fd);
devnull_fd = -1;
}
if (cgns_supported() && unshare(CLONE_NEWCGROUP) != 0) {
SYSERROR("Failed to unshare cgroup namespace");
goto out_warn_father;
@ -871,6 +884,11 @@ out_warn_father:
/* we want the parent to know something went wrong, so we return a special
* error code. */
lxc_sync_wake_parent(handler, LXC_SYNC_ERROR);
out_error:
if (devnull_fd >= 0)
close(devnull_fd);
return -1;
}