$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v9.0-u-ydi1-11357-29668/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v9.0-u-ydi1-11357-29668/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin cb7c711679c7ddecbd7b8a007469b4b35f836162:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         cb7c711679c7ddecbd7b8a007469b4b35f836162 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cb7c711 bump release for test build