$ git clone -n https://src.fedoraproject.org/rpms/golang-starlark.git /var/lib/mock/f39-build-1580313-38062/root/chroot_tmpdir/scmroot/golang-starlark
Cloning into '/var/lib/mock/f39-build-1580313-38062/root/chroot_tmpdir/scmroot/golang-starlark'...
$ git fetch origin c5d3d3ac0a6df0b41813af514c78e9595b00f33a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-starlark
 * [new ref]         c5d3d3ac0a6df0b41813af514c78e9595b00f33a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c5d3d3a Update to 0d7263928a