$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v9.0-u-ydi1-11365-29668/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v9.0-u-ydi1-11365-29668/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin d741b796dc1c332516181fcf4748b45230dd7f7c:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         d741b796dc1c332516181fcf4748b45230dd7f7c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d741b79 bump release for test build