$ git clone -n https://src.fedoraproject.org/rpms/lookup.git /var/lib/mock/f41-build-1029171-18375/root/chroot_tmpdir/scmroot/lookup
Cloning into '/var/lib/mock/f41-build-1029171-18375/root/chroot_tmpdir/scmroot/lookup'...
$ git fetch origin 177543d5cac6a752d712c421bb2c5f62c22b93ed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lookup
 * [new ref]         177543d5cac6a752d712c421bb2c5f62c22b93ed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 177543d Eliminate use of obsolete %patchN syntax (#2283636)