$ git clone -n https://src.fedoraproject.org/rpms/lighttpd.git /var/lib/mock/f40-build-746922-112890/root/chroot_tmpdir/scmroot/lighttpd
Cloning into '/var/lib/mock/f40-build-746922-112890/root/chroot_tmpdir/scmroot/lighttpd'...
$ git fetch origin cd13a312ca7abce3ef69e846a14f00eaddc4b87f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lighttpd
 * [new ref]         cd13a312ca7abce3ef69e846a14f00eaddc4b87f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cd13a31 1.4.73