$ git clone -n https://src.fedoraproject.org/rpms/stunnel.git /var/lib/mock/f40-build-796416-140692/root/chroot_tmpdir/scmroot/stunnel
Cloning into '/var/lib/mock/f40-build-796416-140692/root/chroot_tmpdir/scmroot/stunnel'...
$ git fetch origin 304e4a8ec00dbeece698194c0b4bc29990da7b07:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/stunnel
 * [new ref]         304e4a8ec00dbeece698194c0b4bc29990da7b07 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 304e4a8 New upstream release 5.72