On Fri, Jul 09, 2010 at 06:26:18PM -0600, Eric Blake wrote: >On 07/04/2010 11:17 AM, Christopher Faylor wrote: >> On Sun, Jul 04, 2010 at 04:50:41AM -0500, Yaakov (Cygwin/X) wrote: >>> With tar-1.23-1 and recent snapshot: >>> >>> echo foo > foo >>> ln -s $PWD/foo bar >>> tar cf test.tar bar foo >>> rm -f bar foo >>> tar xf test.tar >>> ls -l bar foo >>> >>> You will see that 'bar' is a 0-byte file with 0000 permissions instead >>> of a symlink. The symlink reference need not be absolute; it also >>> happens with relative links in different directories, but does not >>> happen if I just "ln -s foo bar". >> >> That's because of the way that tar handles symlinks. If you have a >> reference to an absolute path, tar makes a zero-length regular file >> placeholder. Then when it is done extracting, tar is supposed to remove >> this file and create the real symlink. However, the test to make sure >> that it is ok to do this was broken by a recent DLL change. The inode >> returned the first time that the file was created was != the inode when >> the file is checked later. So tar thought that the zero-length file was >> modified and silently decided not to create the symlink. > >For the longest time, I was carrying a cygwin-specific patch that >ignored the inode check. Thinking that it was leftovers from 1.5, I >removed that cygwin-specific patch (that is, re-enabled the inode >check), because I didn't have a test case that would trigger it. It >looks like you have demonstrated the test case, and if cgf fixed the dll >to report the same inode in both situations, then great. But since I'm >on vacation at the moment, with only limited email access, it will be >another week before I can even think about re-building tar to re-enable >the cygwin-specific patch. I'll do that, unless cygwin 1.7.6 is >released first and fixes the problem in the meantime.
AFAIK, this was a problem only in snapshots so there is no reason for a new release. cgf (who's also on vacation) -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
