fs-util: Add xopenat()

xopenat() will create directories if O_DIRECTORY and O_CREAT are
specified. Note that this is not an atomic operation.

1 files changed, 25 insertions, 0 deletions

diff --git a/src/test/test-fs-util.c b/src/test/test-fs-util.c
index c009424a2b..065ad3c6e7 100644
--- a/src/test/test-fs-util.c
+++ b/src/test/test-fs-util.c
@@ -1155,6 +1155,31 @@ TEST(openat_report_new) {
         assert_se(b);
 }
 
+TEST(xopenat) {
+        _cleanup_close_ int tfd = -EBADF, fd = -EBADF;
+        _cleanup_(rm_rf_physical_and_freep) char *t = NULL;
+
+        assert_se((tfd = mkdtemp_open(NULL, 0, &t)) >= 0);
+
+        /* Test that xopenat() creates directories if O_DIRECTORY is specified. */
+
+        assert_se((fd = xopenat(tfd, "abc", O_DIRECTORY|O_CREAT|O_EXCL|O_CLOEXEC, 0755)) >= 0);
+        assert_se((fd_verify_directory(fd) >= 0));
+        fd = safe_close(fd);
+
+        assert_se(xopenat(tfd, "abc", O_DIRECTORY|O_CREAT|O_EXCL|O_CLOEXEC, 0755) == -EEXIST);
+
+        assert_se((fd = xopenat(tfd, "abc", O_DIRECTORY|O_CREAT|O_CLOEXEC, 0755)) >= 0);
+        assert_se((fd_verify_directory(fd) >= 0));
+        fd = safe_close(fd);
+
+        /* Test that xopenat() creates regular files if O_DIRECTORY is not specified. */
+
+        assert_se((fd = xopenat(tfd, "def", O_CREAT|O_EXCL|O_CLOEXEC, 0644)) >= 0);
+        assert_se(fd_verify_regular(fd) >= 0);
+        fd = safe_close(fd);
+}
+
 static int intro(void) {
         arg_test_dir = saved_argv[1];
         return EXIT_SUCCESS;