$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-abourgeois1-9580-28328/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-abourgeois1-9580-28328/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 0a299aa33224fa9a4f935206372927eaad2fa91e:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         0a299aa33224fa9a4f935206372927eaad2fa91e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0a299aa bump release for test build