$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-incoming-11500-29805/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-incoming-11500-29805/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 8dd4101049b84ce30300ed95906f34f24b0b7d9e:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         8dd4101049b84ce30300ed95906f34f24b0b7d9e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8dd4101 Merge pull request #125 from xcp-ng-rpms/asv/proper-fix-snap-export-qcow2