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nspawn: check env var first, detect second

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If we are going to use the env var to override the detection result
anyway, there is not point in doing the detection, especially that
it can fail.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2016-10-02 20:07:22 +02:00
parent 5a46d55fc8
commit 98afd6af3a
1 changed files with 7 additions and 7 deletions
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14
src/nspawn/nspawn.c
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@ -320,13 +320,6 @@ static int detect_unified_cgroup_hierarchy(void) {
const char *e;
int r, all_unified, systemd_unified;
all_unified = cg_all_unified();
systemd_unified = cg_unified(SYSTEMD_CGROUP_CONTROLLER);
if (all_unified < 0 || systemd_unified < 0)
return log_error_errno(all_unified < 0 ? all_unified : systemd_unified,
"Failed to determine whether the unified cgroups hierarchy is used: %m");
/* Allow the user to control whether the unified hierarchy is used */
e = getenv("UNIFIED_CGROUP_HIERARCHY");
if (e) {
@ -341,6 +334,13 @@ static int detect_unified_cgroup_hierarchy(void) {
return 0;
}
all_unified = cg_all_unified();
systemd_unified = cg_unified(SYSTEMD_CGROUP_CONTROLLER);
if (all_unified < 0 || systemd_unified < 0)
return log_error_errno(all_unified < 0 ? all_unified : systemd_unified,
"Failed to determine whether the unified cgroups hierarchy is used: %m");
/* Otherwise inherit the default from the host system */
if (all_unified > 0)
arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_ALL;