Nice debug work Ronan!
Now up to finding why this would go wrong.
filesystem does, it it's pre-install script:
if not posix.stat("/var/run") then
posix.symlink("/run","/var/run")
end
Which can only mean that when the installation happened, /var/run existed
already (otherwise it would have been symlinked)
So the big question will be to find what was evil enough to create this
directory