$ git clone -n https://github.com/xcp-ng-rpms/livepatch-build-tools.git /var/lib/mock/v8.3-incoming-9981-28645/root/chroot_tmpdir/scmroot/livepatch-build-tools
Cloning into '/var/lib/mock/v8.3-incoming-9981-28645/root/chroot_tmpdir/scmroot/livepatch-build-tools'...
$ git fetch origin efccc89d6e34890f2a02e7ffc419a1b0e670412f:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/livepatch-build-tools
 * [new ref]         efccc89d6e34890f2a02e7ffc419a1b0e670412f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at efccc89 Merge pull request #2 from xcp-ng-rpms/stormi/XSrebase