fsade: Refactor the POSIX.1e abstractions

Since we're going to want to abstract more things that aren't part of
POSIX.1e (like xattrs) in a similar way, let's give this a more generic
name.  And while we're at it, give it some more precise error reporting,
and add some tests.

1 files changed, 58 insertions, 0 deletions

diff --git a/fsade.h b/fsade.h
new file mode 100644
index 0000000..d4e97c0
--- /dev/null
+++ b/fsade.h
@@ -0,0 +1,58 @@
+/****************************************************************************
+ * bfs                                                                      *
+ * Copyright (C) 2019 Tavian Barnes <tavianator@tavianator.com>             *
+ *                                                                          *
+ * Permission to use, copy, modify, and/or distribute this software for any *
+ * purpose with or without fee is hereby granted.                           *
+ *                                                                          *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES *
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF         *
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR  *
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES   *
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN    *
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF  *
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.           *
+ ****************************************************************************/
+
+/**
+ * A facade over (file)system features that are (un)implemented differently
+ * between platforms.
+ */
+
+#ifndef BFS_FSADE_H
+#define BFS_FSADE_H
+
+#include "bftw.h"
+#include "util.h"
+#include <stdbool.h>
+
+#define BFS_CAN_CHECK_ACL BFS_HAS_SYS_ACL
+
+#if !defined(BFS_CAN_CHECK_CAPABILITIES) && BFS_HAS_SYS_CAPABILITY && !__FreeBSD__
+#	include <sys/capability.h>
+#	ifdef CAP_CHOWN
+#		define BFS_CAN_CHECK_CAPABILITIES true
+#	endif
+#endif
+
+/**
+ * Check if a file has a non-trvial Access Control List.
+ *
+ * @param ftwbuf
+ *         The file to check.
+ * @return
+ *         1 if it does, 0 if it doesn't, or -1 if an error occurred.
+ */
+int bfs_check_acl(const struct BFTW *ftwbuf);
+
+/**
+ * Check if a file has a non-trvial capability set.
+ *
+ * @param ftwbuf
+ *         The file to check.
+ * @return
+ *         1 if it does, 0 if it doesn't, or -1 if an error occurred.
+ */
+int bfs_check_capabilities(const struct BFTW *ftwbuf);
+
+#endif // BFS_FSADE_H