$ git clone -n https://src.fedoraproject.org/rpms/golang-github-aclements-gg.git /var/lib/mock/f40-build-2245847-53791/root/chroot_tmpdir/scmroot/golang-github-aclements-gg
Cloning into '/var/lib/mock/f40-build-2245847-53791/root/chroot_tmpdir/scmroot/golang-github-aclements-gg'...
$ git fetch origin 5553223dce32d9b86803ce1b08ff801cf56e3906:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-aclements-gg
 * [new ref]         5553223dce32d9b86803ce1b08ff801cf56e3906 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5553223 Remove deprecated %patchN syntax