$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-incoming-9547-28293/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-incoming-9547-28293/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin e93f452cdf232de2a4b79a82e94e8d321b03c872:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         e93f452cdf232de2a4b79a82e94e8d321b03c872 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e93f452 Merge pull request #113 from xcp-ng-rpms/asv/8.3-fix-vhd-zeroblocks