$ git clone -n https://github.com/xcp-ng-rpms/rsync.git /var/lib/mock/v8.3-incoming-10626-29180/root/chroot_tmpdir/scmroot/rsync
Cloning into '/var/lib/mock/v8.3-incoming-10626-29180/root/chroot_tmpdir/scmroot/rsync'...
$ git fetch origin ecca3772abbcc98f867a3a7d87d6edb0b8dce327:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/rsync
 * [new ref]         ecca3772abbcc98f867a3a7d87d6edb0b8dce327 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ecca377 Merge pull request #4 from xcp-ng-rpms/pcoval/review/master