$ git clone -n https://src.fedoraproject.org/rpms/njam.git /var/lib/mock/f41-build-772696-13507/root/chroot_tmpdir/scmroot/njam
Cloning into '/var/lib/mock/f41-build-772696-13507/root/chroot_tmpdir/scmroot/njam'...
$ git fetch origin bf0b2858427e2eb987c717da380c7c2cf902b51b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/njam
 * [new ref]         bf0b2858427e2eb987c717da380c7c2cf902b51b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bf0b285 Eliminate use of obsolete %patchN syntax (#2283636)