$ git clone -n https://src.fedoraproject.org/rpms/nanovna-saver.git /var/lib/mock/f39-build-1819696-41839/root/chroot_tmpdir/scmroot/nanovna-saver
Cloning into '/var/lib/mock/f39-build-1819696-41839/root/chroot_tmpdir/scmroot/nanovna-saver'...
$ git fetch origin 90ed19d7e6df2210d9336a426fce8b3e6069bdab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nanovna-saver
 * [new ref]         90ed19d7e6df2210d9336a426fce8b3e6069bdab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 90ed19d New version