$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v9.0-u-ydi1-11571-29876/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v9.0-u-ydi1-11571-29876/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 9dcfd145f6e63034f20f156ca85a0bef86d4ebbe:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         9dcfd145f6e63034f20f156ca85a0bef86d4ebbe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9dcfd14 bump release for test build