$ git clone -n https://github.com/xcp-ng-rpms/rsync.git /var/lib/mock/v8.3-u-pcoval1-9911-28613/root/chroot_tmpdir/scmroot/rsync
Cloning into '/var/lib/mock/v8.3-u-pcoval1-9911-28613/root/chroot_tmpdir/scmroot/rsync'...
$ git fetch origin c24870bacd9e16e6528f704bcf96b9b6d76ac6b3:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/rsync
 * [new ref]         c24870bacd9e16e6528f704bcf96b9b6d76ac6b3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c24870b bump release for test build