$ git clone -n https://src.fedoraproject.org/rpms/python-rfc3339-validator.git /var/lib/mock/f40-build-2098787-50439/root/chroot_tmpdir/scmroot/python-rfc3339-validator
Cloning into '/var/lib/mock/f40-build-2098787-50439/root/chroot_tmpdir/scmroot/python-rfc3339-validator'...
$ git fetch origin 3b193cfe1a6f8bcc8112920feccda3b92eee0e74:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-rfc3339-validator
 * [new ref]         3b193cfe1a6f8bcc8112920feccda3b92eee0e74 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3b193cf Do not package a duplicate AUTHORS.rst