$ git clone -n https://src.fedoraproject.org/rpms/gnome-builder.git /var/lib/mock/f41-build-side-1-2793371-32695/root/chroot_tmpdir/scmroot/gnome-builder
Cloning into '/var/lib/mock/f41-build-side-1-2793371-32695/root/chroot_tmpdir/scmroot/gnome-builder'...
$ git fetch origin a06586ed9afd662dd21aed1dd5b364875821043b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-builder
 * [new ref]         a06586ed9afd662dd21aed1dd5b364875821043b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a06586e Update to 47.1