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Cygwin dll: UID and GID information not shown from remote drive
- From: Jari Aalto <jari dot aalto at cante dot net>
- To: cygwin at cygwin dot com
- Cc: Corinna Vinschen <corinna-cygwin at cygwin dot com>
- Date: Tue, 13 Dec 2011 16:24:22 +0200
- Subject: Cygwin dll: UID and GID information not shown from remote drive
** To CC Emacs BTS, use 10257(at)debbugs.gnu.org
My full original bug report was sent initially to Emacs, because the editor
started considering remotes file as read-only and requiring confirmation
after every save. See:
It appears that Cygwin doesn't show UID and GID on Network drives (Win 7
x64), that are connected with windows "Map Network Drive" to a
$ ls -la /cygdrive/z/tmp/test-epackage.el
-rwxr--r-- 1 ???????? ???????? 437 Dec 9 20:02 /cygdrive/z/tmp/test-epackage.el
Ken Brown <kbrown <at> cornell.edu>, the Cygwin Emacs maintainer, answered
in original bug report suggesting to contact Cygwin mailing list to see if
anything could be done at Cygwin DLL side:
| emacs uses file-writable-p, which calls check_writable() (defined in
| fileio.c), which calls euidaccess(). That explains why emacs thinks
| the file is not writable when Cygwin can't determine the UID. It
| would certainly be possible to make check_writable() use a different
| method of determining writability on Cygwin, as it already does on
| MSDOS. But I still think it would be best to try to fix this in
| Cygwin first.
| >The Disk drive has been mapped with Standard Windows "Map network
| >drive" feature.
| So why don't you ask on the Cygwin list whether access() and
| euidaccess() can be taught to give the "right" answer for files on
| such drives. Or maybe the question is simply whether Cygwin can be
| taught to determine the correct UID.
I'm hoping the Cygwin DLL developer(s) could share their thoughts
on this to thelp the Emacs team.
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