$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v9.0-u-ydi1-11606-29898/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v9.0-u-ydi1-11606-29898/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 1253447a31349e644c8be3d4ea28975804c7e082:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         1253447a31349e644c8be3d4ea28975804c7e082 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1253447 bump release for test build