$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-psafont2-9747-28457/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-psafont2-9747-28457/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 6c0a097d0c6f02c9449b73ea8b03534317f93c1f:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         6c0a097d0c6f02c9449b73ea8b03534317f93c1f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c0a097 bump release for test build