$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-gtn1-9829-28542/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-gtn1-9829-28542/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 1d50cbcdc12c89eaf916ce732ce8d39299d63b70:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         1d50cbcdc12c89eaf916ce732ce8d39299d63b70 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1d50cbc bump release for test build