$ git clone -n https://src.fedoraproject.org/rpms/blitz.git /var/lib/mock/f41-build-762805-13458/root/chroot_tmpdir/scmroot/blitz
Cloning into '/var/lib/mock/f41-build-762805-13458/root/chroot_tmpdir/scmroot/blitz'...
$ git fetch origin bb65faebb299b0ecc620b709c65b909fd7e77c7a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/blitz
 * [new ref]         bb65faebb299b0ecc620b709c65b909fd7e77c7a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bb65fae Eliminate use of obsolete %patchN syntax (#2283636)