test-oomd-util: fix running in mkosi

When this test is run in mkosi, the previously tested cgroup that we write
xattrs into and the root cgroup are the same.

Since the root cgroup is a live cgroup anyways (vs. the test cgroups which are
remade each time) let's generate the expected preference values from reading
the xattrs instead of assuming it will be NONE.

diff --git a/src/oom/test-oomd-util.c b/src/oom/test-oomd-util.c
index bd1c574ca7fa02cabb24d155edcf9f541d190625..278fc305b3e518fee696c0ae7c7aa8c9d4d87a6e 100644 (file)
--- a/src/oom/test-oomd-util.c
+++ b/src/oom/test-oomd-util.c
@@ -88,9 +88,10 @@ static void test_oomd_cgroup_context_acquire_and_insert(void) {
         _cleanup_hashmap_free_ Hashmap *h1 = NULL, *h2 = NULL;
         _cleanup_(oomd_cgroup_context_freep) OomdCGroupContext *ctx = NULL;
         _cleanup_free_ char *cgroup = NULL;
+        ManagedOOMPreference root_pref;
         OomdCGroupContext *c1, *c2;
         bool test_xattrs;
-        int r;
+        int root_xattrs, r;
 
         if (geteuid() != 0)
                 return (void) log_tests_skipped("not root");
@@ -140,10 +141,16 @@ static void test_oomd_cgroup_context_acquire_and_insert(void) {
         ctx = oomd_cgroup_context_free(ctx);
 
         /* Test the root cgroup */
+        /* Root cgroup is live and not made on demand like the cgroup the test runs in. It can have varying
+         * xattrs set already so let's read in the booleans first to get the final preference value. */
+        root_xattrs = cg_get_xattr_bool(SYSTEMD_CGROUP_CONTROLLER, "", "user.oomd_omit");
+        root_pref = root_xattrs > 0 ? MANAGED_OOM_PREFERENCE_OMIT : MANAGED_OOM_PREFERENCE_NONE;
+        root_xattrs = cg_get_xattr_bool(SYSTEMD_CGROUP_CONTROLLER, "", "user.oomd_avoid");
+        root_pref = root_xattrs > 0 ? MANAGED_OOM_PREFERENCE_AVOID : MANAGED_OOM_PREFERENCE_NONE;
         assert_se(oomd_cgroup_context_acquire("", &ctx) == 0);
         assert_se(streq(ctx->path, "/"));
         assert_se(ctx->current_memory_usage > 0);
-        assert_se(ctx->preference == MANAGED_OOM_PREFERENCE_NONE);
+        assert_se(ctx->preference == root_pref);
 
         /* Test hashmap inserts */
         assert_se(h1 = hashmap_new(&oomd_cgroup_ctx_hash_ops));