$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-psafont1-8859-27820/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-psafont1-8859-27820/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 17ca106a48158bc6ca41852ff0fcbb657f759ae0:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         17ca106a48158bc6ca41852ff0fcbb657f759ae0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 17ca106 bump release for test build