$ git clone -n https://src.fedoraproject.org/rpms/gimp-resynthesizer.git /var/lib/mock/f45-build-11055-426/root/chroot_tmpdir/scmroot/gimp-resynthesizer
Cloning into '/var/lib/mock/f45-build-11055-426/root/chroot_tmpdir/scmroot/gimp-resynthesizer'...
$ git fetch origin 20dc4f3696dd4c13e3d82540652fe663cb50819c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gimp-resynthesizer
 * [new ref]         20dc4f3696dd4c13e3d82540652fe663cb50819c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 20dc4f3 Update to upstream 3.0.1 (rhbz#2453456)