$ git clone -n https://src.fedoraproject.org/rpms/golang-x-exp.git /var/lib/mock/f41-build-1476406-23792/root/chroot_tmpdir/scmroot/golang-x-exp
Cloning into '/var/lib/mock/f41-build-1476406-23792/root/chroot_tmpdir/scmroot/golang-x-exp'...
$ git fetch origin df6df781031c34c6af475916cd86ac2948517757:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-x-exp
 * [new ref]         df6df781031c34c6af475916cd86ac2948517757 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at df6df78 Bump to commit 7f521ea00fb803b5b0afbd67743292096b09056b