$ git clone -n https://src.fedoraproject.org/rpms/firewalk.git /var/lib/mock/f41-build-1020725-18018/root/chroot_tmpdir/scmroot/firewalk
Cloning into '/var/lib/mock/f41-build-1020725-18018/root/chroot_tmpdir/scmroot/firewalk'...
$ git fetch origin 93e3f1ebd0ad6c324991df7c41366547ed0899cd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/firewalk
 * [new ref]         93e3f1ebd0ad6c324991df7c41366547ed0899cd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 93e3f1e Eliminate use of obsolete %patchN syntax (#2283636)