File ownership changes with save

File ownership changes with save

[arguellodw]

When I edit and save a file that is owned by somebody else, emacs gives me
ownership of the newly edited file (say file1.dat) and retains ownership of
the backup file (file1.dat~) for the original owner.

How do I configure emacs to give ownership of the new file to the original
owner?
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Re: File ownership changes with save

[Lowell Gilbert]

arguellodw <arguellodw@yahoo.com> writes:

> When I edit and save a file that is owned by somebody else, emacs gives me
> ownership of the newly edited file (say file1.dat) and retains ownership of
> the backup file (file1.dat~) for the original owner.
>
> How do I configure emacs to give ownership of the new file to the original
> owner?

    I'd suggest setting `backup-by-copying-when-mismatch'.

    I got the information from the documentation for make-backup-files:
    make-backup-files is a variable defined in `files.el'.
    Its value is t


    Documentation:
    Non-nil means make a backup of a file the first time it is saved.
    This can be done by renaming the file or by copying.

    Renaming means that Emacs renames the existing file so that it is a
    backup file, then writes the buffer into a new file.  Any other names
    that the old file had will now refer to the backup file.  The new file
    is owned by you and its group is defaulted.

    Copying means that Emacs copies the existing file into the backup
    file, then writes the buffer on top of the existing file.  Any other
    names that the old file had will now refer to the new (edited) file.
    The file's owner and group are unchanged.

    The choice of renaming or copying is controlled by the variables
    `backup-by-copying', `backup-by-copying-when-linked',
    `backup-by-copying-when-mismatch' and
    `backup-by-copying-when-privileged-mismatch'.  See also
    `backup-inhibited'.

    You can customize this variable.