$ git clone -n https://github.com/xcp-ng-rpms/sm.git /var/lib/mock/v8.3-u-dtt1-11613-29903/root/chroot_tmpdir/scmroot/sm
Cloning into '/var/lib/mock/v8.3-u-dtt1-11613-29903/root/chroot_tmpdir/scmroot/sm'...
$ git fetch origin 8723db7da25753dcec27ca6847cf66e7026a85e4:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sm
 * [new ref]         8723db7da25753dcec27ca6847cf66e7026a85e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8723db7 bump release for test build