bug#13513: 24.3.50; Going "--non-interactive" is the wrong thing for SVN on OSX

[Stefan Monnier <monnier@iro.umontreal.ca>]

>> So, could someone explain to me when --non-interactive is needed?
>> The report seemed to be for w32, does that mean that it's only ever needed
>> for w32, or is it also sometimes needed under GNU/Linux?
> IIUC on GNU/Linux:
> Semi-recent svn default to using gnome-keyring to store encrypted
> passwords for svn servers that need them. So suppose you are working in
> a svn checkout of a remote repository that needs a password.  You've
> previously stored the password encrypted on your local disk.
> Now you type any command that needs to contact the server (eg svn status
> -u, or svn update). If at the command-line, you get a prompt:
>   Password for 'login' GNOME keyring:
> You enter your normal user password, it decrypts the stored svn password
> and everything then works.

But if DISPLAY is set, gnome-keyring should prompt you via an X11 dialog
box, AFAIK.

> If you call the same svn commands from Emacs VC prior to 24.1, it hangs
> forever with no indication of what's going on (bug#9993).  Using
> --non-interactive makes it abort instantly with a meaningful error
> message.

So I think the right way to go about it is to not use --non-interactive,
but add a process filter in vc-svn.el to detect such situations (and
then do something like query the password and send it to svn, or emit
an error).


        Stefan