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bug#10257: 23.3.1 Cygwin: network drives - file is write protected (fals


From: Ken Brown
Subject: bug#10257: 23.3.1 Cygwin: network drives - file is write protected (false positive)
Date: Fri, 09 Dec 2011 15:33:46 -0500
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:8.0) Gecko/20111105 Thunderbird/8.0

On 12/9/2011 1:23 PM, Jari Aalto wrote:
Package: emacs
Version: 23.3+1-4
Severity: normal

TEST CASE

     - OS: Windows 7 64 bit
     - Start Cygwin X server:
       XWin :0 -unixkill -multiwindow
     - Start Cygwin Emacs:
       DISPLAY=:0 emacs-X11&
     - C-x C-f any network drive file

Is there really a problem on *any* network drive, or is the issue that you have some particular file system on that drive for which Cygwin can't get reliable permission information?

I would think that you should try to get help on the Cygwin list before talking about making emacs bypass permission checks on Cygwin. I don't use network drives myself, but I know that plenty of people do, and the Cygwin maintainers are very accommodating in trying to teach Cygwin to recognize problematic file systems.

And if that fails, can't you solve the problem by mounting your drive with the noacl option?

     Emacs marks the file as read-only (%%) and asks every time a question
     after pressing C-x C-s:

         File<name here>  is write-protected; try to save anyway? (y or n)

PROBLEM

     The constant prompting "Y/N" makes writing to a network drive location
     exessively hard. It's nuissance to have to be able to confirm every
     save action.

     There doens't seem to be way to turn of this prompting.

SUGGESTION

     The logic of checking if file is write protedted or not does not seem
     to be reliable under Cygwin regarding network drives. The Permissions
     probably don't come through correctly for Emacs to examine them.

     A) Offer option to turn of confirmation
     B) or bypass write protection checks under Cygwin

TEST DATA

Here is an example under Cygwin Emacs:

     (file-attributes "/cygdrive/z/tmp/test-epackage.el")
     =>  (nil 1 4294967295.0 4294967295.0 (20194 11100) (20194 19792) (20194
     19792) 437 "-rwxr--r--" t (-1735557 1952988 . 8890) (30147 . 13405))

Under Cygwin Bash shell it looks like this:

     $ ls -la /cygdrive/z/tmp/test-epackage.el
     -rwxr--r-- 1 ???????? ???????? 437 Dec  9 20:02 
/cygdrive/z/tmp/test-epackage.el

Note: the uid and gid information is not available from this non-domain
network drive.






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