$ git clone -n https://github.com/xcp-ng-rpms/xcp-emu-manager /var/lib/mock/v8.3-u-lpottier1-10458-29024/root/chroot_tmpdir/scmroot/xcp-emu-manager
Cloning into '/var/lib/mock/v8.3-u-lpottier1-10458-29024/root/chroot_tmpdir/scmroot/xcp-emu-manager'...
$ git fetch origin a673234b3b50423086d6d54e44f50cdcaf0afe3c:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-emu-manager
 * [new ref]         a673234b3b50423086d6d54e44f50cdcaf0afe3c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a673234 pre-build doesn't work because of emu-manager pkg name clash