$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-gtn1-8881-27834/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-gtn1-8881-27834/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin c24d58a0dc8d9e8f9b1c1524425928370b58bac8:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         c24d58a0dc8d9e8f9b1c1524425928370b58bac8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c24d58a bump release for test build