mux 0.15.2

[ThomasK33]

Adds the Mux Homebrew cask to this tap.

• New Casks/mux.rb (v0.15.2) with per-arch sha256 values for the GitHub release DMGs.
• CI: run brew audit --cask --strict --online --tap coder/coder mux on macOS PR jobs.
• README: document installation via brew install --cask coder/coder/mux.

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📋 Implementation Plan

Plan: Add mux Homebrew Cask to coder/homebrew-coder

Context / Why

We want brew install --cask coder/coder/mux to work for the Mux macOS DMG releases, and for future Mux release automation to be able to open PRs against this tap that update only version + sha256.

Scope here is only the coder/homebrew-coder (tap) changes (not the Mux repo workflow/script).

Evidence (repo inspection)

• Existing cask conventions + formatting:
  • Casks/coder-desktop.rb
  • Casks/coder-desktop-preview.rb
• Current CI uses brew test-bot --only-tap-syntax and does not have a dedicated “only casks” mode:
  • .github/workflows/test.yml
  • Homebrew test-bot CLI options (no --only-casks): cmd/test-bot.rb from Homebrew/homebrew-test-bot (fetched via functions.web_fetch).
• Tap default branch appears to be master (remote HEAD): remotes/origin/HEAD -> origin/master.

Implementation plan

1) Add the cask: Casks/mux.rb

Create a new cask file modeled after existing casks in this tap, using per-arch sha256 and the Mux release DMG filename convention.

Key decisions to bake in:

• Use arch arm: "arm64", intel: "x64" to match Mux release assets.
• Set auto_updates true (Mux uses in-app update via GitHub releases).
• Be conservative with zap: include only ~/Library/... app data by default; do not delete ~/.mux unless we explicitly decide to make that a supported “nuclear cleanup”.

File shape (fill in real values before merge):

cask "mux" do
  arch arm: "arm64", intel: "x64"

  version "0.15.2" # example; set to the release being bootstrapped
  sha256 arm:   "<sha256-arm64-dmg>",
         intel: "<sha256-x64-dmg>"

  url "https://github.com/coder/mux/releases/download/v#{version}/mux-#{version}-#{arch}.dmg"
  name "Mux"
  desc "Electron desktop app for parallel agent workflows"
  homepage "https://mux.coder.com/"

  auto_updates true

  # Verify exact bundle name inside the DMG (likely "Mux.app")
  app "Mux.app"

  # Verify bundle identifier matches Mux’s `appId` (expected: "com.mux.app")
  uninstall quit: "com.mux.app"

  zap trash: [
    "~/Library/Application Support/mux",
    "~/Library/Caches/mux",
    "~/Library/Preferences/com.mux.app.plist",
    "~/Library/Logs/mux",
    # Optional but commonly correct for macOS apps:
    # "~/Library/Saved Application State/com.mux.app.savedState",
  ]
end

Bootstrapping the initial version + sha256:

• Download both DMGs for the chosen release tag (e.g. v0.15.2):
  • mux-<version>-arm64.dmg
  • mux-<version>-x64.dmg
• Compute SHA-256s and populate the two sha256 values.

2) Validate locally (pre-PR)

On macOS (both architectures if possible):

• brew tap coder/coder
• brew audit --cask --strict --online --tap coder/coder mux
• brew install --cask coder/coder/mux
• Launch the app, confirm it starts.
• brew uninstall --cask mux and (optionally) brew uninstall --zap mux to sanity-check zap paths.

3) Ensure PRs get useful CI signal for cask-only changes

Current workflow runs brew test-bot --only-tap-syntax and --only-formulae on PRs (see .github/workflows/test.yml). brew test-bot doesn’t have an --only-casks mode, so cask changes may only get syntax validation.

Recommended adjustment (small, cask-focused):

• Add a brew audit --cask --strict --online --tap coder/coder mux step on the macOS runner for PRs.
• Keep it scoped to this tap’s casks to avoid auditing everything.

4) (Optional) Documentation tweak

Add a short “Install Mux” snippet to README.md:

brew install --cask coder/coder/mux

Acceptance criteria

• Casks/mux.rb exists and passes brew audit --cask --strict --online --tap coder/coder mux.
• brew install --cask coder/coder/mux installs and launches Mux successfully.
• Tap PR CI provides a meaningful signal for cask updates (at minimum: syntax; ideally: audit).

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Generated with mux • Model: openai:gpt-5.2 • Thinking: xhigh

[aslilac]

having identical linux hashes is definitely incorrect

[aslilac]

we definitely do not own mux.com. is this actually our bundle identifier? it should be com.coder.mux instead

[ThomasK33]

@aslilac, thanks for the review, and I'm sorry, but this wasn’t meant to be reviewed yet. I need to do a few things on the Mux side first, and didn’t realize it had already turned itself into a PR. My bad 😓 .