$ git clone -n https://src.fedoraproject.org/rpms/GraphicsMagick.git /var/lib/mock/f38-build-side-42-init-devel-594117-26158/root/chroot_tmpdir/scmroot/GraphicsMagick
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-594117-26158/root/chroot_tmpdir/scmroot/GraphicsMagick'...
$ git fetch origin d6a93355a5e4141f8a5f042e3f20226c3253c81f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/GraphicsMagick
 * [new ref]         d6a93355a5e4141f8a5f042e3f20226c3253c81f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d6a9335 1.3.40