$ git clone -n https://src.fedoraproject.org/rpms/gstreamer1-plugins-good.git /var/lib/mock/f45-build-13124-446/root/chroot_tmpdir/scmroot/gstreamer1-plugins-good
Cloning into '/var/lib/mock/f45-build-13124-446/root/chroot_tmpdir/scmroot/gstreamer1-plugins-good'...
$ git fetch origin f88e5c83078125c504ce436c00bb86725d5dcb91:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gstreamer1-plugins-good
 * [new ref]         f88e5c83078125c504ce436c00bb86725d5dcb91 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f88e5c8 Rebuilt for libxml-2.5.4