test: cover DeviceAllow parsing

Add unit coverage for config_parse_device_allow().

Verify valid device paths and subsystem patterns, invalid
specifiers and rights, default permissions, and reset handling.

Follow-up for: 20d52ab60e

TODO.md

@@ -2684,9 +2684,6 @@ SPDX-License-Identifier: LGPL-2.1-or-later
   automatically support reverting back to older OS version images if newer ones
   fail to boot.
 
-- **test/:**
-  - add unit tests for config_parse_device_allow()
-
 - The bind(AF_UNSPEC) construct (for resetting sockets to their initial state)
   should be blocked in many cases because it punches holes in many sandboxes.
 

src/test/test-load-fragment.c

@@ -9,6 +9,7 @@
 #include "all-units.h"
 #include "alloc-util.h"
 #include "capability-util.h"
+#include "cgroup.h"
 #include "conf-parser.h"
 #include "fileio.h"
 #include "format-util.h"
@@ -39,6 +40,15 @@ STATIC_DESTRUCTOR_REGISTER(runtime_dir, rm_rf_physical_and_freep);
 /* For testing type compatibility. */
 _unused_ static ConfigPerfItemLookup unused_lookup = load_fragment_gperf_lookup;
 
+static size_t cgroup_device_allow_count(const CGroupContext *c) {
+        size_t n = 0;
+
+        LIST_FOREACH(device_allow, a, c->device_allow)
+                n++;
+
+        return n;
+}
+
 TEST_RET(unit_file_get_list) {
         int r;
         _cleanup_hashmap_free_ Hashmap *h = NULL;
@@ -878,6 +888,62 @@ TEST(config_parse_memory_limit) {
         }
 }
 
+TEST(config_parse_device_allow) {
+        _cleanup_(cgroup_context_done) CGroupContext c = {};
+        _cleanup_(manager_freep) Manager *m = NULL;
+        _cleanup_(unit_freep) Unit *u = NULL;
+        CGroupDeviceAllow *a;
+        int r;
+
+        r = manager_new(RUNTIME_SCOPE_USER, MANAGER_TEST_RUN_MINIMAL, &m);
+        if (manager_errno_skip_test(r))
+                return (void) log_tests_skipped_errno(r, "manager_new() failed");
+
+        ASSERT_OK(r);
+
+        ASSERT_NOT_NULL(u = unit_new(m, sizeof(Service)));
+        ASSERT_OK_ZERO(unit_add_name(u, "null.service"));
+
+        ASSERT_OK_ZERO(config_parse_device_allow(u->id, "fake", 1, "Service", 1,
+                                                 "DeviceAllow", 0, "/dev/%N rw",
+                                                 &c, u));
+        ASSERT_EQ(cgroup_device_allow_count(&c), 1U);
+        ASSERT_NOT_NULL(a = c.device_allow);
+        ASSERT_STREQ(a->path, "/dev/null");
+        ASSERT_EQ(a->permissions, CGROUP_DEVICE_READ|CGROUP_DEVICE_WRITE);
+
+        ASSERT_OK_ZERO(config_parse_device_allow(u->id, "fake", 2, "Service", 1,
+                                                 "DeviceAllow", 0, "char-pts rwm",
+                                                 &c, u));
+        ASSERT_EQ(cgroup_device_allow_count(&c), 2U);
+        ASSERT_NOT_NULL(a = c.device_allow);
+        ASSERT_STREQ(a->path, "char-pts");
+        ASSERT_EQ(a->permissions, CGROUP_DEVICE_READ|CGROUP_DEVICE_WRITE|CGROUP_DEVICE_MKNOD);
+
+        ASSERT_OK_ZERO(config_parse_device_allow(u->id, "fake", 3, "Service", 1,
+                                                 "DeviceAllow", 0, "%Q rw",
+                                                 &c, u));
+        ASSERT_EQ(cgroup_device_allow_count(&c), 2U);
+
+        ASSERT_OK_ZERO(config_parse_device_allow(u->id, "fake", 4, "Service", 1,
+                                                 "DeviceAllow", 0, "/dev/zero invalid",
+                                                 &c, u));
+        ASSERT_EQ(cgroup_device_allow_count(&c), 2U);
+
+        ASSERT_OK_ZERO(config_parse_device_allow(u->id, "fake", 5, "Service", 1,
+                                                 "DeviceAllow", 0, "/dev/zero",
+                                                 &c, u));
+        ASSERT_EQ(cgroup_device_allow_count(&c), 3U);
+        ASSERT_NOT_NULL(a = c.device_allow);
+        ASSERT_STREQ(a->path, "/dev/zero");
+        ASSERT_EQ(a->permissions, _CGROUP_DEVICE_PERMISSIONS_ALL);
+
+        ASSERT_OK_ZERO(config_parse_device_allow(u->id, "fake", 6, "Service", 1,
+                                                 "DeviceAllow", 0, "",
+                                                 &c, u));
+        ASSERT_NULL(c.device_allow);
+}
+
 TEST(contains_instance_specifier_superset) {
         ASSERT_TRUE(contains_instance_specifier_superset("foobar@a%i"));
         ASSERT_TRUE(contains_instance_specifier_superset("foobar@%ia"));