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authorLennart Poettering <lennart@poettering.net>2013-03-15 16:41:40 +0100
committerLennart Poettering <lennart@poettering.net>2013-03-15 16:49:08 +0100
commit66e411811b8090d1bfd6620fc84472d83f723fa1 (patch)
tree3762cd014c5bd2b0ba771661ac08975ab43a05dd /src/core/mount-setup.c
parent961e4526925b7b1e1d3582f2fc9fb38035e2b5fb (diff)
sd-booted: update sd_booted() check a bit
Previously we were testing whether /sys/fs/cgroup/systemd/ was a mount point. This might be problematic however, when the cgroup trees are bind mounted into a container from the host (which should be absolutely valid), which might create the impression that the container was running systemd, but only the host actually is. Replace this by a check for the existance of the directory /run/systemd/system/, which should work unconditionally, since /run can never be a bind mount but *must* be a tmpfs on systemd systems, which is flushed at boots. This means that data in /run always reflects information about the current boot, and only of the local container, which makes it the perfect choice for a check like this. (As side effect this is nice to Ubuntu people who now use logind with the systemd cgroup hierarchy, where the old sd_booted() check misdetects systemd, even though they still run legacy Upstart.)
Diffstat (limited to 'src/core/mount-setup.c')
-rw-r--r--src/core/mount-setup.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/src/core/mount-setup.c b/src/core/mount-setup.c
index 42cdc6dc52..ce10be944a 100644
--- a/src/core/mount-setup.c
+++ b/src/core/mount-setup.c
@@ -440,7 +440,11 @@ int mount_setup(bool loaded_policy) {
if (mount(NULL, "/", NULL, MS_REC|MS_SHARED, NULL) < 0)
log_warning("Failed to set up the root directory for shared mount propagation: %m");
- /* Create a few directories we always want around */
+ /* Create a few directories we always want around, Note that
+ * sd_booted() checks for /run/systemd/system, so this mkdir
+ * really needs to stay for good, otherwise software that
+ * copied sd-daemon.c into their sources will misdetect
+ * systemd. */
mkdir_label("/run/systemd", 0755);
mkdir_label("/run/systemd/system", 0755);