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, 13 insertions, 0 deletions

diff --git a/src/copy.h b/src/copy.h
index 12b7c2d28..e6604ee71 100644
--- a/src/copy.h
+++ b/src/copy.h
@@ -173,6 +173,19 @@ struct cp_options
      fail if it is unable to do so.  */
   bool require_preserve_context;
 
+  /* If true, attempt to preserve extended attributes using libattr.
+     Ignored if coreutils are compiled without xattr support. */
+  bool preserve_xattr;
+
+  /* Useful only when preserve_xattr is true.
+     If true, a failed attempt to preserve file's extended attributes
+     propagates failure "out" to the caller.  If false, a failure to
+     preserve file's extended attributes does not change the invoking
+     application's exit status.  Give diagnostics for failed syscalls
+     regardless of this setting.  For example, with "cp --preserve=xattr"
+     this flag is "true", while with "cp --preserve=all", it is false. */
+  bool require_preserve_xattr;
+
   /* If true, copy directories recursively and copy special files
      as themselves rather than copying their contents. */
   bool recursive;