$ git clone -n https://github.com/xcp-ng-rpms/rsync.git /var/lib/mock/v8.3-u-pcoval2-10549-29104/root/chroot_tmpdir/scmroot/rsync
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10549-29104/root/chroot_tmpdir/scmroot/rsync'...
$ git fetch origin 5df59bfd4b132a8ed43f20c3609f89bdd2b1dd18:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/rsync
 * [new ref]         5df59bfd4b132a8ed43f20c3609f89bdd2b1dd18 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5df59bf bump release for test build