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core: set "trusted.delegate" xattr on cgroups that are delegation boundaries

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Let's mark cgroups that are delegation boundaries to us. This can then
be used by tools such as "systemd-cgls" to show where the next manager
takes over.
This commit is contained in:
Lennart Poettering 2019-11-20 17:42:02 +01:00
parent bf25f1657f
commit 3288ea8f32
1 changed files with 20 additions and 8 deletions
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28
src/core/cgroup.c
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@ -617,15 +617,27 @@ static void cgroup_xattr_apply(Unit *u) {
if (!MANAGER_IS_SYSTEM(u->manager))
return;
if (sd_id128_is_null(u->invocation_id))
return;
if (!sd_id128_is_null(u->invocation_id)) {
r = cg_set_xattr(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path,
"trusted.invocation_id",
sd_id128_to_string(u->invocation_id, ids), 32,
0);
if (r < 0)
log_unit_debug_errno(u, r, "Failed to set invocation ID on control group %s, ignoring: %m", u->cgroup_path);
}
r = cg_set_xattr(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path,
"trusted.invocation_id",
sd_id128_to_string(u->invocation_id, ids), 32,
0);
if (r < 0)
log_unit_debug_errno(u, r, "Failed to set invocation ID on control group %s, ignoring: %m", u->cgroup_path);
if (unit_cgroup_delegate(u)) {
r = cg_set_xattr(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path,
"trusted.delegate",
"1", 1,
0);
if (r < 0)
log_unit_debug_errno(u, r, "Failed to set delegate flag on control group %s, ignoring: %m", u->cgroup_path);
} else {
r = cg_remove_xattr(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, "trusted.delegate");
if (r != -ENODATA)
log_unit_debug_errno(u, r, "Failed to remove delegate flag on control group %s, ignoring: %m", u->cgroup_path);
}
}
static int lookup_block_device(const char *p, dev_t *ret) {