$ git clone -n https://github.com/xcp-ng-rpms/sm.git /var/lib/mock/v8.3-u-abourgeois2-9442-28185/root/chroot_tmpdir/scmroot/sm
Cloning into '/var/lib/mock/v8.3-u-abourgeois2-9442-28185/root/chroot_tmpdir/scmroot/sm'...
$ git fetch origin cc59d8930e80a8b810c156cfc094b6b07c09dbf1:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sm
 * [new ref]         cc59d8930e80a8b810c156cfc094b6b07c09dbf1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cc59d89 bump release for test build