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Date:	Wed, 16 Sep 2009 13:13:33 +0100
From:	Dave Korn <dave DOT korn DOT cygwin AT googlemail DOT com>
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To:	cygwin AT cygwin DOT com
Subject:	Re: Bug or feature missing in rsync.
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Lapo Luchini wrote:

> The real reason is the following test:
> 
>   configure:8272: checking whether to support extended attributes
>   configure:8321: result: No extended attribute support found
> 
> ...well, judging from configure lines 8272-8321 it seems rsync xattr
> support is only available in linux, darwin and freebsd.
> 
> So, yes, that isn't "activating a switch" but rater "write a feature",
> which could be easy or difficult - I don't know enough about it right
> now to be the judge of that; definitely needs some more RTFM regarding
> xattrs on my side (and that needs time, which I have little on my hands,
> right now).
> As usual, the PTC principle applies there to have results faster.
> http://www.cygwin.com/acronyms/#PTC

  It appears that cygwin has the xattr functions implemented and exported:

> $ grep setxattr /gnu/winsup/src/winsup/cygwin/cygwin.din
> fsetxattr SIGFE
> lsetxattr SIGFE
> setxattr SIGFE

  So it could be as simple as using the existing linux support on cygwin too,
by doing something like:

$ diff -pu configure.in.orig configure.in
--- configure.in.orig   2009-09-16 13:10:53.125000000 +0100
+++ configure.in        2009-09-16 13:11:41.437500000 +0100
@@ -933,7 +933,7 @@ if test x"$enable_xattr_support" = x"no"
     AC_MSG_RESULT(no)
 else
     case "$host_os" in
-    *linux*)
+    *linux* | *cygwin*)
        AC_MSG_RESULT(Using Linux xattrs)
        AC_DEFINE(HAVE_LINUX_XATTRS, 1, [True if you have Linux xattrs])
        AC_DEFINE(SUPPORT_XATTRS, 1)

admin AT ubik /usr/src/rsync/rsync-3.0.5

... followed of course by regenerating configure.sh.

  I haven't tested this (my cpu usage is already 100% and likely to stay that
way for the next day or two!), but maybe you'd like to give it a whirl?

    cheers,
      DaveK


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