$ git clone -n https://github.com/xcp-ng-rpms/sm.git /var/lib/mock/v8.3-u-dtt2-11520-29837/root/chroot_tmpdir/scmroot/sm
Cloning into '/var/lib/mock/v8.3-u-dtt2-11520-29837/root/chroot_tmpdir/scmroot/sm'...
$ git fetch origin 50537566848828da49eedf2380d4c93581cb5121:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sm
 * [new ref]         50537566848828da49eedf2380d4c93581cb5121 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5053756 bump release for test build