basic: add path_equal_filename helper

src/basic/path-util.c

@@ -527,6 +527,27 @@ bool path_equal_or_files_same(const char *a, const char *b, int flags) {
         return path_equal(a, b) || files_same(a, b, flags) > 0;
 }
 
+bool path_equal_filename(const char *a, const char *b) {
+        _cleanup_free_ char *a_basename = NULL, *b_basename = NULL;
+        int r;
+
+        assert(a);
+        assert(b);
+
+        r = path_extract_filename(a, &a_basename);
+        if (r < 0) {
+                log_debug_errno(r, "Failed to parse basename of %s: %m", a);
+                return false;
+        }
+        r = path_extract_filename(b, &b_basename);
+        if (r < 0) {
+                log_debug_errno(r, "Failed to parse basename of %s: %m", b);
+                return false;
+        }
+
+        return path_equal(a_basename, b_basename);
+}
+
 char* path_join_internal(const char *first, ...) {
         char *joined, *q;
         const char *p;

src/basic/path-util.h

@@ -61,6 +61,8 @@ char* path_startswith(const char *path, const char *prefix) _pure_;
 int path_compare(const char *a, const char *b) _pure_;
 bool path_equal(const char *a, const char *b) _pure_;
 bool path_equal_or_files_same(const char *a, const char *b, int flags);
+/* Compares only the last portion of the input paths, ie: the filenames */
+bool path_equal_filename(const char *a, const char *b);
 char* path_join_internal(const char *first, ...);
 #define path_join(x, ...) path_join_internal(x, __VA_ARGS__, POINTER_MAX)
 

src/test/test-path-util.c

@@ -113,6 +113,11 @@ static void test_path(void) {
         assert_se(!path_equal_ptr("/a", "/b"));
         assert_se(!path_equal_ptr("/a", NULL));
         assert_se(!path_equal_ptr(NULL, "/a"));
+
+        assert_se(path_equal_filename("/a/c", "/b/c"));
+        assert_se(path_equal_filename("/a", "/a"));
+        assert_se(!path_equal_filename("/a/b", "/a/c"));
+        assert_se(!path_equal_filename("/b", "/c"));
 }
 
 static void test_path_equal_root(void) {