chattr-util: Make chattr_full() an openat() style function

src/basic/chattr-util.c

@@ -9,29 +9,29 @@
 #include "chattr-util.h"
 #include "errno-util.h"
 #include "fd-util.h"
+#include "fs-util.h"
 #include "macro.h"
 #include "string-util.h"
 
-int chattr_full(const char *path,
-                int fd,
-                unsigned value,
-                unsigned mask,
-                unsigned *ret_previous,
-                unsigned *ret_final,
-                ChattrApplyFlags flags) {
+int chattr_full(
+              int dir_fd,
+              const char *path,
+              unsigned value,
+              unsigned mask,
+              unsigned *ret_previous,
+              unsigned *ret_final,
+              ChattrApplyFlags flags) {
 
-        _cleanup_close_ int fd_will_close = -EBADF;
+        _cleanup_close_ int fd = -EBADF;
         unsigned old_attr, new_attr;
         int set_flags_errno = 0;
         struct stat st;
 
-        assert(path || fd >= 0);
+        assert(dir_fd >= 0 || dir_fd == AT_FDCWD);
 
-        if (fd < 0) {
-                fd = fd_will_close = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
-                if (fd < 0)
-                        return -errno;
-        }
+        fd = xopenat(dir_fd, path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, /* xopen_flags = */ 0, /* mode = */ 0);
+        if (fd < 0)
+                return -errno;
 
         if (fstat(fd, &st) < 0)
                 return -errno;

src/basic/chattr-util.h

@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 #pragma once
 
+#include <fcntl.h>
 #include <linux/fs.h>
 #include <stdbool.h>
 #include <stddef.h>
@@ -39,13 +40,15 @@ typedef enum ChattrApplyFlags {
         CHATTR_WARN_UNSUPPORTED_FLAGS = 1 << 1,
 } ChattrApplyFlags;
 
-int chattr_full(const char *path, int fd, unsigned value, unsigned mask, unsigned *ret_previous, unsigned *ret_final, ChattrApplyFlags flags);
-
+int chattr_full(int dir_fd, const char *path, unsigned value, unsigned mask, unsigned *ret_previous, unsigned *ret_final, ChattrApplyFlags flags);
+static inline int chattr_at(int dir_fd, const char *path, unsigned value, unsigned mask, unsigned *previous) {
+        return chattr_full(dir_fd, path, value, mask, previous, NULL, 0);
+}
 static inline int chattr_fd(int fd, unsigned value, unsigned mask, unsigned *previous) {
-        return chattr_full(NULL, fd, value, mask, previous, NULL, 0);
+        return chattr_full(fd, NULL, value, mask, previous, NULL, 0);
 }
 static inline int chattr_path(const char *path, unsigned value, unsigned mask, unsigned *previous) {
-        return chattr_full(path, -1, value, mask, previous, NULL, 0);
+        return chattr_full(AT_FDCWD, path, value, mask, previous, NULL, 0);
 }
 
 int read_attr_fd(int fd, unsigned *ret);
@@ -57,5 +60,5 @@ int read_attr_path(const char *p, unsigned *ret);
 #define CHATTR_SECRET_FLAGS (FS_SECRM_FL|FS_NODUMP_FL|FS_SYNC_FL|FS_NOCOW_FL)
 
 static inline int chattr_secret(int fd, ChattrApplyFlags flags) {
-        return chattr_full(NULL, fd, CHATTR_SECRET_FLAGS, CHATTR_SECRET_FLAGS, NULL, NULL, flags|CHATTR_FALLBACK_BITWISE);
+        return chattr_full(fd, NULL, CHATTR_SECRET_FLAGS, CHATTR_SECRET_FLAGS, NULL, NULL, flags|CHATTR_FALLBACK_BITWISE);
 }