Use Gnulib ACL implementation, for benefit of Solaris etc.

* configure.ac: Remove -with-acl option, since Gnulib does that for
us now.
(LIBACL_LIBS): Remove; no longer needed.
* lib/Makefile.am (CLEANFILES, SUFFIXES): New (empty) macros,
for the benefit of the new ACL implementation.
* lib/makefile.w32-in (GNULIBOBJS): Add $(BLD)/acl-errno-valid.$(O).
($(BLD)/acl-errno-valid.$(O)): New rule.
* lib/acl-errno-valid.c, lib/acl-internal.h, lib/acl.h:
* lib/acl_entries.c, lib/errno.in.h, lib/file-has-acl.c:
* lib/qcopy-acl.c, lib/qset-acl.c, m4/acl.m4, m4/errno_h.m4:
New files, taken from gnulib.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* admin/merge-gnulib (GNULIB_MODULES): Add qacl.
(GNULIB_TOOL_FLAGS): Do not avoid errno.
* etc/NEWS: Emacs is no longer limited to POSIX ACLs.  --disable-acl,
not --without-acl, since we're now using Gnulib's implementation.
* nt/config.nt (HAVE_ACL_SET_FILE): Rename from HAVE_POSIX_ACL.
* nt/inc/ms-w32.h (EOPNOTSUPP): New macro.
* src/Makefile.in (LIB_ACL): New macro.
(LIBACL_LIBS): Remove.
(LIBES): Use LIB_ACL, not LIBACL_LIBS.
* src/fileio.c: Include <acl.h>.
Use HAVE_ACL_SET_FILE rather than HAVE_POSIX_ACL.
(ACL_NOT_WELL_SUPPORTED): Remove.  All uses replaced by
!acl_errno_valid.
(Fcopy_file) [!WINDOWSNT]: Use qcopy_acl instead of rolling
it ourselves.

Fixes: debbugs:14295

1 files changed, 75 insertions, 0 deletions

diff --git a/lib/acl_entries.c b/lib/acl_entries.c
new file mode 100644
index 00000000000..7ca7b9d5b40
--- /dev/null
+++ b/lib/acl_entries.c
@@ -0,0 +1,75 @@
+/* Return the number of entries in an ACL.
+
+   Copyright (C) 2002-2003, 2005-2013 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+   Written by Paul Eggert and Andreas Gruenbacher.  */
+
+#include <config.h>
+
+#include "acl-internal.h"
+
+/* This file assumes POSIX-draft like ACLs
+   (Linux, FreeBSD, Mac OS X, IRIX, Tru64).  */
+
+/* Return the number of entries in ACL.
+   Return -1 and set errno upon failure to determine it.  */
+
+int
+acl_entries (acl_t acl)
+{
+  int count = 0;
+
+  if (acl != NULL)
+    {
+#if HAVE_ACL_FIRST_ENTRY /* Linux, FreeBSD, Mac OS X */
+# if HAVE_ACL_TYPE_EXTENDED /* Mac OS X */
+      /* acl_get_entry returns 0 when it successfully fetches an entry,
+         and -1/EINVAL at the end.  */
+      acl_entry_t ace;
+      int got_one;
+
+      for (got_one = acl_get_entry (acl, ACL_FIRST_ENTRY, &ace);
+           got_one >= 0;
+           got_one = acl_get_entry (acl, ACL_NEXT_ENTRY, &ace))
+        count++;
+# else /* Linux, FreeBSD */
+      /* acl_get_entry returns 1 when it successfully fetches an entry,
+         and 0 at the end.  */
+      acl_entry_t ace;
+      int got_one;
+
+      for (got_one = acl_get_entry (acl, ACL_FIRST_ENTRY, &ace);
+           got_one > 0;
+           got_one = acl_get_entry (acl, ACL_NEXT_ENTRY, &ace))
+        count++;
+      if (got_one < 0)
+        return -1;
+# endif
+#else /* IRIX, Tru64 */
+# if HAVE_ACL_TO_SHORT_TEXT /* IRIX */
+      /* Don't use acl_get_entry: it is undocumented.  */
+      count = acl->acl_cnt;
+# endif
+# if HAVE_ACL_FREE_TEXT /* Tru64 */
+      /* Don't use acl_get_entry: it takes only one argument and does not
+         work.  */
+      count = acl->acl_num;
+# endif
+#endif
+    }
+
+  return count;
+}