cp/mv: add xattr support

This patch was originally written by Andreas Grünbacher, nowadays
available at
http://www.suse.de/~agruen/coreutils/5.91/coreutils-xattr.diff

* bootstrap.conf: Add gnulib module verror.
* po/POTFILES.in: Add lib/verror.c.
* m4/xattr.m4: Check for libattr availability, new configure option
--disable-xattr.
* m4/prereq.m4: Require gl_FUNC_XATTR.
* src/Makefile.am: Link cp, mv and ginstall with libattr.
* src/copy.h: Add preserve_xattr and require_preserve_xattr to
cp_options.
* src/copy.c (copy_attr_error): New function to handle errors during
xattr copying.
(copy_attr_quote): New function to quote file name in error messages
printed by libattr.
(copy_attr_free): Empty function requested by libattr to free quoted
string.
(copy_attr_by_fd): New fd-oriented function to copy xattr.
(copy_attr_by_name): New name-oriented function to copy xattr.
(copy_reg, copy_internal): Call copy_extended_attributes function.
* src/cp.c (usage): Mention new --preserve=xattr option.
(decode_preserve_arg): Handle new --preserve=xattr option.
* src/mv.c: Always attempt to preserve xattr.
* src/install.c: Never attempt to preserve xattr.
* tests/misc/xattr: New test for xattr support in cp, mv and install.
* tests/Makefile.am: Add the new test to list.
* doc/coreutils.texi: Mention xattr support, new --preserve=xattr
option.
* NEWS: Mention the change.

1 files changed, 12 insertions, 1 deletions

diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index d8b90876d..7ba872ebb 100644
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -7365,7 +7365,7 @@ symbolic links in the destination are always followed if possible.
 @itemx @w{@kbd{--preserve}[=@var{attribute_list}]}
 @opindex -p
 @opindex --preserve
-@cindex file information, preserving
+@cindex file information, preserving, extended attributes, xattr
 Preserve the specified attributes of the original files.
 If specified, the @var{attribute_list} must be a comma-separated list
 of one or more of the following strings:
@@ -7392,6 +7392,11 @@ Preserve in the destination files
 any links between corresponding source files.
 @c Give examples illustrating how hard links are preserved.
 @c Also, show how soft links map to hard links with -L and -H.
+@itemx xattr
+Preserve extended attributes if @command{cp} is built with xattr support,
+and xattrs are supported and enabled on your file system.
+If SELinux context and/or ACLs are implemented using xattrs,
+they are preserved by this option as well.
 @itemx all
 Preserve all file attributes.
 Equivalent to specifying all of the above.
@@ -7935,6 +7940,9 @@ attributes of destination files.  It is typically used in Makefiles to
 copy programs into their destination directories.  It refuses to copy
 files onto themselves.
 
+@cindex extended attributes, xattr
+@command{install} never preserves extended attributes (xattr).
+
 The program accepts the following options.  Also see @ref{Common options}.
 
 @table @samp
@@ -8083,6 +8091,9 @@ directory succeeded, but the second didn't, the first would be left on
 the destination partition and the second and third would be left on the
 original partition.
 
+@cindex extended attributes, xattr
+@command{mv} always tries to copy extended attributes (xattr).
+
 @cindex prompting, and @command{mv}
 If a destination file exists but is normally unwritable, standard input
 is a terminal, and the @option{-f} or @option{--force} option is not given,