$ git clone -n https://src.fedoraproject.org/rpms/python-ndjson-testrunner.git /var/lib/mock/f40-build-2027799-47329/root/chroot_tmpdir/scmroot/python-ndjson-testrunner
Cloning into '/var/lib/mock/f40-build-2027799-47329/root/chroot_tmpdir/scmroot/python-ndjson-testrunner'...
$ git fetch origin c172b45de18d12551482c89fb0a7d9d62979bd2b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-ndjson-testrunner
 * [new ref]         c172b45de18d12551482c89fb0a7d9d62979bd2b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c172b45 Remove old files