Re: Git rebase dies with fatal: Unable to create '.../.git/index.lock': File exists.

[Jeff King <peff@peff.net>]

On Mon, Sep 16, 2013 at 12:28:52PM -0600, Jason Gunthorpe wrote:

> I have emacs windows open that have files within the git tree open in
> them. My emacs has vc-git mode loaded and global-auto-revert-mode set.
> 
> During the rebase the files open in emacs are changed by git, when
> emacs notices this (which is random with respect to the ongoing
> rebase) it auto reverts and runs git commands (due to vc-git), which
> causes the rebase to randomly fail.
> 
> Worse, I've noticed that this also randomly seems to cause the rebase
> to loose a commit if you --continue from that point.
> 
> Can git have some retry in the locking so this doesn't happen?

I'm not clear on which git commands are being run. If they are actually
mutating the index, then isn't this more than a lock contention issue?
In other words, "git rebase" is assuming nobody is mucking with the
index while it runs; if emacs is doing so, then the results could be
quite confusing, even if we retried the lock acquisition.

-Peff