$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-incoming-8915-27866/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-incoming-8915-27866/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin f5aae5cc9e0dc76ce9e5a244b94b78138c0d20af:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         f5aae5cc9e0dc76ce9e5a244b94b78138c0d20af -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f5aae5c Merge pull request #109 from xcp-ng-rpms/asv/xenopsd-conf-packaging