$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v9.0-u-ydi1-11530-29849/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v9.0-u-ydi1-11530-29849/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 9f486d80afa373efbca6ead843a71e80046adb1e:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         9f486d80afa373efbca6ead843a71e80046adb1e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9f486d8 bump release for test build