Re: [GSoC] Move ~/.git-credential-cache to ~/.cache/git

[Jonathan Nieder <jrnieder@gmail.com>]

(+cc: npostavs)
Hi Devin,

Devin Lehmacher wrote:

> I started working on this microproject and am not quite sure what is
> necessary for backwards compatibility. Since the socket is recreated
> whenever the credential daemon exits backwards compatibility
> shouldn’t really be a concern with regard to where the socket is
> located in the filesystem.
>
> However, contrib/persistent-https depends on the socket being at
> ~/.git-credential-cache/socket, so changing the default location
> would break this. However, if we need to keep the socket at that
> location for cases like this I don’t understand how this change
> would be helpful in any way.

That's a good question.  If I'm reading contrib/persistent-https/
correctly, it uses the same directory but doesn't rely on the socket
there, so it should not be a problem.

However, that reminded me to search for other tools that might rely on
the socket.  Using
https://codesearch.debian.net/search?q=%5C.git-credential-cache, I
find that magit does rely on the socket path.

 $ git clone https://github.com/magit/magit
 $ git log -S.git-credential-cache
 commit 0f30dfbb0075ac2e99b65a2c7fac360197a989c1
 Author: Noam Postavsky <npostavs@users.sourceforge.net>
 Date:   Sat Oct 24 15:57:54 2015 -0400

    Start credential daemon on magit-credential-hook

    If we let git start the daemon, Emacs will send a SIGHUP when git
    finishes and closes the pty, killing the daemon.  Hence the need to have
    our own daemon running first.

Cc-ing Noam to figure out what a safe transition will look like.

Thanks for noticing,
Jonathan