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, 52 insertions, 0 deletions

diff --git a/lib/acl-errno-valid.c b/lib/acl-errno-valid.c
new file mode 100644
index 00000000000..a391d077f5c
--- /dev/null
+++ b/lib/acl-errno-valid.c
@@ -0,0 +1,52 @@
+/* Test whether ACLs are well supported on this system.
+
+   Copyright 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.  */
+
+#include <config.h>
+
+#include <acl.h>
+
+#include <errno.h>
+
+/* Return true if errno value ERRNUM indicates that ACLs are well
+   supported on this system.  ERRNUM should be an errno value obtained
+   after an ACL-related system call fails.  */
+bool
+acl_errno_valid (int errnum)
+{
+  /* Recognize some common errors such as from an NFS mount that does
+     not support ACLs, even when local drives do.  */
+  switch (errnum)
+    {
+    case EBUSY: return false;
+    case EINVAL: return false;
+#if defined __APPLE__ && defined __MACH__
+    case ENOENT: return false;
+#endif
+    case ENOSYS: return false;
+
+#if defined ENOTSUP && ENOTSUP != EOPNOTSUPP
+# if ENOTSUP != ENOSYS /* Needed for the MS-Windows port of GNU Emacs.  */
+    case ENOTSUP: return false;
+# endif
+#endif
+
+    case EOPNOTSUPP: return false;
+    default: return true;
+    }
+}