automatically upload a file when it is put in a given local directory

[davidsarah]

During the Tahoe-LAFS summit, I (David-Sarah) implemented a prototype of a dropbox-like uploader: if you write a file into a given directory, it will upload it to a given Tahoe mutable directory (with the same name as its name in the local filesystem).

Its current limitations are:

• it only handles one directory, not including subdirectories
• the behaviour when multiple files are put in the directory (or the same file more than once) has not been well-tested so far
• it doesn't have unit tests or docs (I will write those)
• it must be given the URI of a mutable directory to upload to; it would be more usable to allow that to be a path that may start with an alias
• it uses the ​twisted.internet.inotify API, which depends on Twisted 10.1 and is only supported on platforms with inotify.

[davidsarah]

Prototype implementation of drop-upload from Tahoe-LAFS summit. No tests or docs. (Corrected to include new file.)