$ git clone -n https://src.fedoraproject.org/rpms/falkon.git /var/lib/mock/f40-build-1915249-25086/root/chroot_tmpdir/scmroot/falkon
Cloning into '/var/lib/mock/f40-build-1915249-25086/root/chroot_tmpdir/scmroot/falkon'...
$ git fetch origin 5e4c656f4639a04dbc3ff72df2b01a80e7ed64ef:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/falkon
 * [new ref]         5e4c656f4639a04dbc3ff72df2b01a80e7ed64ef -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5e4c656 Merge branch 'rawhide' into f40