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bug#22795: 25.0.91; Can't write read only file on w32

From: Eli Zaretskii
Subject: bug#22795: 25.0.91; Can't write read only file on w32
Date: Thu, 25 Feb 2016 18:47:39 +0200

> Date: Wed, 24 Feb 2016 13:57:49 -0800
> CC: <address@hidden>
> From: "Ota, Takaaki" <address@hidden>
> Wed, 24 Feb 2016 21:09:57 +0200: Eli Zaretskii <address@hidden> wrote:
> > > Date: Wed, 24 Feb 2016 08:44:02 -0800
> > > From: "Ota, Takaaki" <address@hidden>
> > > 
> > > When a file is read only on w32 platform I used to be able to write a
> > > file by toggling the buffer's read-only-mode state and answering yes
> > > to this question "File memo is write-protected; try to save anyway?
> > > (yes or no)" but now the writing fails by an error message "Opening
> > > output file: Permission denied, c:/d/ota/memo"
> > 
> > I cannot reproduce this, neither with today's emacs-25 nor with the
> > last pretest of 25.1.  If I answer yes to that question, the file is
> > saved without any errors.
> > 
> > How did you make the file read-only?  (I used a Windows port of
> > 'chmod' and the 'attrib' command.)
> I used Windows Explorer's GUI to open the file property window and
> placed a check on Read-only attribute.  I am using mingw to build the
> emacs.  I just tried with 24.5 and it works but not on 25.0.90/91.
> They are all build by the same mingw.

This doesn't happen for me even if I use the Explorer.

There's some other factor at work here.  Does this happen with any
file, anywhere on your filesystems?  E.g., can you try on a drive
other than C: ?

Also, do you, as the user, own the directory where this file lives, or
is its owner another user?

And what filesystem is that? NTFS or FAT32?

Finally, does this happen in "emacs -Q", or do you need some
customizations for the problem to happen?


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