$ git clone -n https://src.fedoraproject.org/rpms/janet.git /var/lib/mock/f40-build-2241270-53661/root/chroot_tmpdir/scmroot/janet
Cloning into '/var/lib/mock/f40-build-2241270-53661/root/chroot_tmpdir/scmroot/janet'...
$ git fetch origin 53b5c8765a81716990c8382bb056c5d83fe94e9f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/janet
 * [new ref]         53b5c8765a81716990c8382bb056c5d83fe94e9f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 53b5c87 Initial import BZ 2245348