$ git clone -n https://github.com/xcp-ng-rpms/rsync.git /var/lib/mock/v8.3-u-pcoval2-10380-28941/root/chroot_tmpdir/scmroot/rsync
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10380-28941/root/chroot_tmpdir/scmroot/rsync'...
$ git fetch origin c7317a02a7aa998a09e9cb67aef1fb308e187b9d:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/rsync
 * [new ref]         c7317a02a7aa998a09e9cb67aef1fb308e187b9d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c7317a0 bump release for test build