$ git clone -n https://github.com/xcp-ng-rpms/sm.git /var/lib/mock/v8.3-u-abourgeois2-9769-28487/root/chroot_tmpdir/scmroot/sm
Cloning into '/var/lib/mock/v8.3-u-abourgeois2-9769-28487/root/chroot_tmpdir/scmroot/sm'...
$ git fetch origin 45641a6d0b0ed1c74f4f6a4bc149aabf5969ac42:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sm
 * [new ref]         45641a6d0b0ed1c74f4f6a4bc149aabf5969ac42 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 45641a6 bump release for test build