$ git clone -n https://src.fedoraproject.org/rpms/telepathy-gabble.git /var/lib/mock/f40-build-2368254-60387/root/chroot_tmpdir/scmroot/telepathy-gabble
Cloning into '/var/lib/mock/f40-build-2368254-60387/root/chroot_tmpdir/scmroot/telepathy-gabble'...
$ git fetch origin f325b6846c4b85bfcfe9f19c0d511ee58bedc08e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/telepathy-gabble
 * [new ref]         f325b6846c4b85bfcfe9f19c0d511ee58bedc08e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f325b68 Patch for libxml2 2.12.0 API constness change