Dependencies
itch uses a few external tools to download & manage content.
It installs and keeps them up-to-date automatically, which means you should never have to worry about them. However, in the interest of you knowing what runs on your computer, they're documented here.
Everything is downloaded from our download server at https://dl.itch.ovh.
Third-party programs are built from source. Home-grown programs are continuously built on our CI servers.
Directories
All dependencies are downloaded and extracted into the following folders:
%APPDATA%\itch\brothon Windows~/Library/Application Support/itch/brothon OSX~/.config/itch/brothon Linux
Packages
butler
butler is a homemade (itch.io-made) command-line tool, distributed under the MIT license.
Its source code is available here, for you to audit, debug, and improve at will:
Building your own version is as simple as running:
go get -v github.com/itchio/butler
(assuming you have Go 1.9+ installed on your system)
Implementation
The logic for downloading, extracting and installing itch dependencies can be found in the broth directory.
The authors are aware of the irony of having an ad-hoc, half-baked Implementation of a package manager inside a package managing application, itself installed by various other package managers, and there is no need to point it out!