$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-incoming-8887-27842/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-incoming-8887-27842/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 3df051acdbb7705ec7aedf434c534774c95edbd2:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         3df051acdbb7705ec7aedf434c534774c95edbd2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3df051a Packaging changes for xenopsd.conf