Re: tramp (2.0.28); su protocol changes file permissions

[Kai Großjohann]

tinu <address@hidden> writes:

> Tramp changes the permissions of a file accessed with the su protocol.
> I access the file as /su:address@hidden:/usr/local/bin/myfile, edit
> it and on saving permissions are changed from 755 to 600.

I think this is not a Tramp-specific problem: Emacs changes the
permissions of all files accessed.  This is because of the backup
strategy: before saving the file foo, Emacs will rename the existing
file to foo~ and then it will create a new file foo.  The new file is
of course created subject to the usual umask settings.

I think you can verify this if you create a file with unusual
permissions, then edit it with Emacs.  (You could give it g-rwx
permissions, for example.)

This Emacs behavior is controlled by the variable backup-by-copying
and its friends.  M-x apropos-variable RET backup RET will give you a
list of variables to tweak.

Does this help?  Or do you think that Tramp should still do something?
-- 
Ambibibentists unite!