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appcast

The value of the appcast stanza is a string, holding the URL for an appcast which provides information on future updates.

Example: atom.rb

There are a few different ways the appcast can be determined:

  • If the app is distributed via GitHub releases, the appcast will be of the form https://github.com/{{user}}/{{project_name}}/releases.atom. (Example: electron.rb)

  • The popular update framework Sparkle generally uses the SUFeedURL property in Contents/Info.plist inside .app bundles. (Example: glyphs.rb)

  • HockeyApp URLs are of the form https://rink.hockeyapp.net/api/2/apps/{{hexadecimal_string}}{{something_else}}. For the appcast, remove {{something_else}} (ending up with https://rink.hockeyapp.net/api/2/apps/{{hexadecimal_string}}. (Example: canary.rb)

  • DevMate appcasts resemble https://updates.devmate.com/{{app_bundle_id}}.xml. (Example: screens.rb)

  • Sourceforge projects follow the form https://sourceforge.net/projects/{{project_name}}/rss. A more specific page can be used as needed, pointing to a specific directory structure: https://sourceforge.net/projects/{{project_name}}/rss?path=/{{path_here}}. (Example: seashore.rb)

  • An appcast can be any URL hosted by the app’s developer that changes every time a new release is out (e.g. a changelog HTML page). (Example: razorsql.rb)

The find_appcast script can automatically identify some of these. You can run it with "$(brew --repository)/Library/Taps/homebrew/homebrew-cask/developer/bin/find_appcast" '{{/path/to/software.app}}' to find the appcast automatically.