Phabricator: rP9d051cddd3679d4a580738721624e536b03f6843
OS: FreeBSD-10.2 RELEASE (jailed)

Steps to reproduce:

1. Add an external repository with path like svn+ssh://user@host/svn/project-name.
2. Make sure it's busy, so it syncs every 15s.
3. ls /tmp after minutes, hours, 1 day, 2 days,...

I've had a very huge amount of temporary directories after a few weeks, some of them still containing .passphrase-ssh-key (now tidied up, so I only have 4 days old directories there, that's "only" 88k of them). I noticed that having hundreds of thousands of directory entries in /tmp also affects Phabricator stability, because ExecFuture might fail if it uses setTimeout and /tmp (like in PhabricatorImageTransformer::applyMemeWithImagemagick where the timeout is just set to 10 seconds). The contents of passphrase-ssh-key is the secret key used by phd to sync from my external Subversion repositories.

I also suspect that this is not only caused by the Subversion import, but temporary files are not tidied up somewhere else, too (because of directories that do not contain passphrase-ssh-key and are empty). Maybe they are caused by temporary files while browsing sources in Diffusion. I cannot tell exactly.