$ git clone -n https://src.fedoraproject.org/rpms/golang-starlark.git /var/lib/mock/f45-build-20276-569/root/chroot_tmpdir/scmroot/golang-starlark
Cloning into '/var/lib/mock/f45-build-20276-569/root/chroot_tmpdir/scmroot/golang-starlark'...
$ git fetch origin 91517b80af683c7320bb3c4310faaae27147d755:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-starlark
 * [new ref]         91517b80af683c7320bb3c4310faaae27147d755 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 91517b8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild