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condition: add a condition that matches against the machine tags

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Lennart Poettering
2026-05-21 18:30:16 +02:00
parent 71eac88e5f
commit 461ec6facc
6 changed files with 123 additions and 0 deletions
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src/test/test-condition.c
+63
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@@ -1414,6 +1414,69 @@ TEST(condition_test_os_release) {
condition_free(condition);
}
TEST(condition_test_machine_tag) {
Condition *condition;
/* etc_machine_info() caches the path on first use, so redirect it before anything reads it and
* rewrite the same file (truncating) for each scenario rather than switching paths. */
_cleanup_free_ char *saved = NULL;
ASSERT_OK(free_and_strdup(&saved, getenv("SYSTEMD_ETC_MACHINE_INFO")));
_cleanup_(rm_rf_physical_and_freep) char *d = NULL;
ASSERT_OK(mkdtemp_malloc(NULL, &d));
_cleanup_free_ char *f = path_join(d, "machine-info");
ASSERT_NOT_NULL(f);
ASSERT_OK_ERRNO(setenv("SYSTEMD_ETC_MACHINE_INFO", f, /* overwrite= */ true));
ASSERT_OK(write_string_file(f, "TAGS=\"webserver:frontend:berlin\"\n",
WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_TRUNCATE));
/* Exact match */
ASSERT_NOT_NULL((condition = condition_new(CONDITION_MACHINE_TAG, "webserver", /* trigger= */ false, /* negate= */ false)));
ASSERT_OK_POSITIVE(condition_test(condition, environ));
condition_free(condition);
/* Glob match */
ASSERT_NOT_NULL((condition = condition_new(CONDITION_MACHINE_TAG, "front*", /* trigger= */ false, /* negate= */ false)));
ASSERT_OK_POSITIVE(condition_test(condition, environ));
condition_free(condition);
/* No match */
ASSERT_NOT_NULL((condition = condition_new(CONDITION_MACHINE_TAG, "database", /* trigger= */ false, /* negate= */ false)));
ASSERT_OK_ZERO(condition_test(condition, environ));
condition_free(condition);
/* Negation matches when the tag is absent, ... */
ASSERT_NOT_NULL((condition = condition_new(CONDITION_MACHINE_TAG, "database", /* trigger= */ false, /* negate= */ true)));
ASSERT_OK_POSITIVE(condition_test(condition, environ));
condition_free(condition);
/* ... and does not match when the tag is present */
ASSERT_NOT_NULL((condition = condition_new(CONDITION_MACHINE_TAG, "webserver", /* trigger= */ false, /* negate= */ true)));
ASSERT_OK_ZERO(condition_test(condition, environ));
condition_free(condition);
/* Invalid tags in the file are ignored (matching the Tags D-Bus property) */
ASSERT_OK(write_string_file(f, "TAGS=\"in valid:good\"\n",
WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_TRUNCATE));
ASSERT_NOT_NULL((condition = condition_new(CONDITION_MACHINE_TAG, "in valid", /* trigger= */ false, /* negate= */ false)));
ASSERT_OK_ZERO(condition_test(condition, environ));
condition_free(condition);
ASSERT_NOT_NULL((condition = condition_new(CONDITION_MACHINE_TAG, "good", /* trigger= */ false, /* negate= */ false)));
ASSERT_OK_POSITIVE(condition_test(condition, environ));
condition_free(condition);
/* No tags configured at all → never matches */
ASSERT_OK(write_string_file(f, "PRETTY_HOSTNAME=\"x\"\n",
WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_TRUNCATE));
ASSERT_NOT_NULL((condition = condition_new(CONDITION_MACHINE_TAG, "webserver", /* trigger= */ false, /* negate= */ false)));
ASSERT_OK_ZERO(condition_test(condition, environ));
condition_free(condition);
ASSERT_OK(set_unset_env("SYSTEMD_ETC_MACHINE_INFO", saved, /* overwrite= */ true));
}
TEST(condition_test_psi) {
Condition *condition;
CGroupMask mask;