1 files changed, 55 insertions, 0 deletions
diff --git a/src/shared/acl-util.h b/src/shared/acl-util.h
new file mode 100644
index 0000000..6f70e28
--- /dev/null
+++ b/src/shared/acl-util.h
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <errno.h>
+#include <unistd.h>
+
+int fd_acl_make_read_only_fallback(int fd);
+int fd_acl_make_writable_fallback(int fd);
+
+#if HAVE_ACL
+#include <acl/libacl.h>
+#include <stdbool.h>
+#include <sys/acl.h>
+
+#include "macro.h"
+
+int acl_find_uid(acl_t acl, uid_t uid, acl_entry_t *entry);
+int calc_acl_mask_if_needed(acl_t *acl_p);
+int add_base_acls_if_needed(acl_t *acl_p, const char *path);
+int acl_search_groups(const char* path, char ***ret_groups);
+int parse_acl(const char *text, acl_t *acl_access, acl_t *acl_default, bool want_mask);
+int acls_for_file(const char *path, acl_type_t type, acl_t new, acl_t *acl);
+int fd_add_uid_acl_permission(int fd, uid_t uid, unsigned mask);
+
+int fd_acl_make_read_only(int fd);
+int fd_acl_make_writable(int fd);
+
+/* acl_free takes multiple argument types.
+ * Multiple cleanup functions are necessary. */
+DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(acl_t, acl_free, NULL);
+#define acl_free_charp acl_free
+DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(char*, acl_free_charp, NULL);
+#define acl_free_uid_tp acl_free
+DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(uid_t*, acl_free_uid_tp, NULL);
+#define acl_free_gid_tp acl_free
+DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(gid_t*, acl_free_gid_tp, NULL);
+
+#else
+#define ACL_READ    0x04
+#define ACL_WRITE   0x02
+#define ACL_EXECUTE 0x01
+
+static inline int fd_add_uid_acl_permission(int fd, uid_t uid, unsigned mask) {
+        return -EOPNOTSUPP;
+}
+
+static inline int fd_acl_make_read_only(int fd) {
+        return fd_acl_make_read_only_fallback(fd);
+}
+
+static inline int fd_acl_make_writable(int fd) {
+        return fd_acl_make_writable_fallback(fd);
+}
+
+#endif