$ git clone -n https://github.com/xcp-ng-rpms/sm /var/lib/mock/v8.3-u-gln1-11336-29651/root/chroot_tmpdir/scmroot/sm
Cloning into '/var/lib/mock/v8.3-u-gln1-11336-29651/root/chroot_tmpdir/scmroot/sm'...
$ git fetch origin b6fec5e8289f2dc909a7a0d7bffc89acced920b8:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sm
 * [new ref]         b6fec5e8289f2dc909a7a0d7bffc89acced920b8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b6fec5e bump release for test build