$ git clone -n https://src.fedoraproject.org/rpms/libkdtree++.git /var/lib/mock/f41-build-750646-13382/root/chroot_tmpdir/scmroot/libkdtree++
Cloning into '/var/lib/mock/f41-build-750646-13382/root/chroot_tmpdir/scmroot/libkdtree++'...
$ git fetch origin 26935104af9f54c17803f26754e8fdd85efce3da:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libkdtree++
 * [new ref]         26935104af9f54c17803f26754e8fdd85efce3da -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2693510 Eliminate use of obsolete %patchN syntax (#2283636)