$ git clone -n https://github.com/xcp-ng-rpms/mdadm /var/lib/mock/v8.3-u-pcoval2-11486-29788/root/chroot_tmpdir/scmroot/mdadm
Cloning into '/var/lib/mock/v8.3-u-pcoval2-11486-29788/root/chroot_tmpdir/scmroot/mdadm'...
$ git fetch origin 815e43f3f3c52f9d7de5dac246b9d7e9754bdc45:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/mdadm
 * [new ref]         815e43f3f3c52f9d7de5dac246b9d7e9754bdc45 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 815e43f bump release for test build