$ git clone -n https://github.com/xcp-ng-rpms/sm.git /var/lib/mock/v8.3-u-dtt1-11467-29774/root/chroot_tmpdir/scmroot/sm
Cloning into '/var/lib/mock/v8.3-u-dtt1-11467-29774/root/chroot_tmpdir/scmroot/sm'...
$ git fetch origin 511a7330e1b75ab7e56e09c4fb1aa41a48a8e115:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sm
 * [new ref]         511a7330e1b75ab7e56e09c4fb1aa41a48a8e115 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 511a733 bump release for test build