lxc_setup_fs: Create /dev/shm folder if it doesn't exist

When running application containers with lxc-execute, /dev is populated only with device entries. Since /dev is a tmpfs mount in the container environment, the /dev/shm folder not being present is not a sufficient reason for the /dev/shm mount to fail. Create the /dev/shm directory if not present. Signed-off-by: Bogdan Purcareata <bogdan.purcareata@nxp.com> Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>

lxc_setup_fs: Create /dev/shm folder if it doesn't exist
81e3c9cf · Bogdan Purcareata · Stéphane Graber · 01074e5b · 81e3c9cf
Commit 81e3c9cf authored Jan 08, 2016 by Bogdan Purcareata Committed by Stéphane Graber Jan 28, 2016
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initutils.c src/lxc/initutils.c +4 -0

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--- a/src/lxc/initutils.c
+++ b/src/lxc/initutils.c
@@ -47,6 +47,10 @@ extern void lxc_setup_fs(void)
 	if (mount_fs("proc", "/proc", "proc"))
 		INFO("failed to remount proc");

+	/* if /dev has been populated by us, /dev/shm does not exist */
+	if (access("/dev/shm", F_OK) && mkdir("/dev/shm", 0777))
+		INFO("failed to create /dev/shm");
+
 	/* if we can't mount /dev/shm, continue anyway */
 	if (mount_fs("shmfs", "/dev/shm", "tmpfs"))
 		INFO("failed to mount /dev/shm");