$ git clone -n https://github.com/xcp-ng-rpms/xapi /var/lib/mock/v8.3-incoming-10698-29246/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-incoming-10698-29246/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 41899cb425c4ec9b424cfe5ac34d820800ef85a7:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         41899cb425c4ec9b424cfe5ac34d820800ef85a7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 41899cb Merge pull request #117 from xcp-ng-rpms/pcoval/review/master