Add support for preserving ACL entries of files.

	* configure.ac (acl): New option.
	(HAVE_POSIX_ACL): Test for POSIX ACL support.  This is typically
	provided by libacl on GNU/Linux.

	* fileio.c (Ffile_acl, Fset_file_acl): New functions.
	(Fcopy_file): Change last arg to `preserve_extended_attributes'
	and copy ACL entries of file in addition to SELinux context if
	set.
	(syms_of_fileio): Add `file-acl' and `set-file-acl'.

	* Makefile.in (LIBACL_LIBS): New macro.
	(LIBES): Use it.

	* files.el (file-extended-attributes)
	(set-file-extended-attributes): New functions.
	(backup-buffer): Use them to handle both SELinux context and ACL
	entries.
	(backup-buffer-copy): Work with an alist of extended attributes,
	rather than an SELinux context.
	(basic-save-buffer-2): Ditto.

	* files.texi (File Attributes): Document ACL support and new
	`file-acl' function.
	(Changing Files): Mention argument name change of `copy-file' and
	document new function `set-file-acl'.

1 files changed, 24 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 0063aedb0db..1c82b760946 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -22,6 +22,12 @@ so we will look at it and add it to the manual.
 
 
 * Installation Changes in Emacs 24.4
+
+** Emacs can be compiled with POSIX ACL support.
+This happens by default if a suitable support library is found at
+build time, like libacl on GNU/Linux.  To prevent this, use the
+configure option `--without-acl'.
+
 * Startup Changes in Emacs 24.4
 * Changes in Emacs 24.4
 
@@ -33,6 +39,14 @@ if there is one.
 This unfinished feature was introduced by accident in Emacs 23.1;
 simply disabling Transient Mark mode does the same thing.
 
+** ACL support has been added.
++++
+*** Emacs preserves the ACL entries of files when backing up.
++++
+*** New functions `file-acl' and `set-file-acl' get and set the ACL
+entries of a file.  On GNU/Linux the POSIX ACL interface is used via
+libacl.
+
 * Editing Changes in Emacs 24.4
 
 ** New commands `toggle-frame-maximized' and `cycle-frame-maximized',
@@ -149,6 +163,12 @@ special-forms any more.
 VAR was bound to nil which was not tremendously useful and just lead to
 spurious warnings about an unused var.
 
+** The return value of `backup-buffer' has changed.
+The second argument is no longer an SELinux context, instead it is an
+alist of extended attributes as returned by the new function
+`file-extended-attributes'.  The attributes can be applied to another
+file using `set-file-extended-attributes'.
+
 * Lisp changes in Emacs 24.4
 
 ** Support for filesystem notifications.
@@ -186,6 +206,10 @@ used in place of the 9th element of `file-attributes'.
 
 ** New functions `group-gid' and `group-real-gid'.
 
+** The 6th argument to `copy-file' has been renamed to
+`preserve-extended-attributes' as it now handles both SELinux context
+and ACL entries.
+
 * Changes in Emacs 24.4 on non-free operating systems
 
 +++