From: Junio C Hamano <gitster@pobox.com>
Date: Mon, 07 Dec 2015 19:54:43 GMT
Subject: Re: Post-receive hook for "git pull"
Message-ID: <xmqqio4am3uk.fsf@gitster.mtv.corp.google.com>
In-Reply-To: <jwv4mful6nu.fsf-monnier+gmane.comp.version-control.git@gnu.org>

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> I have a system here where it can be quite common to have thousands of
> branches in the remote repository, and where I'd like to update some
> local state according to the appearance of new branches (or updates of
> pre-existing ones).
>
> Currently, I use a "git for-each-ref" after pulling and then check (for
> each one of those refs) if an update is warranted, but this can get slow
> with that many branches.  Is there some way to get something like the
> post-receive hook to be run for "git pull", so that the script gets told
> directly which (remote tracking) branches have been modified/created?

I do not think there is.  But you could easily script along the
lines of...

    #!/bin/sh
    git for-each-ref | sort >prestate
    git pull "$@"
    git for-each-ref | sort >poststate
    comm -12 prestate poststate

... or something like that, no?