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Both setup workflows died in `brew bundle`, for unrelated reasons.
macOS: homebrew-core deleted tflint on 2026-05-13 over its BUSL relicense,
so `brew 'tflint'` now resolves to nothing ("No available formula"). The
upstream tap only ships a cask, which would be macOS-only and needs
`brew trust` for a third-party tap. Installing it with `go install`
instead keeps tflint on Linux too and matches how terraform-ls and tfsec
are already installed a few lines away.
Ubuntu/WSL: the runners ship a preinstalled Homebrew with auto-update
disabled. When it is older than the formula JSON API's schema it aborts
mid-pour with "unknown install step: run", which took out tmux and gnupg.
The scripts ran `brew upgrade` but never `brew update`, so Homebrew itself
stayed stale; update_homebrew() now does both.
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Summary
macOS / Ubuntu / WSL の setup workflow が揃って
brew bundleで落ちていた。原因は無関係な2つ。Changes
macOS:
tflintが homebrew-core から消えたhomebrew-core が 2026-05-13 に BUSL 再ライセンスを理由に tflint を削除しており、
brew 'tflint'はNo available formula with the name "tflint"になる（formula API も 404）。upstream の
terraform-linters/tapは cask しか提供しておらず、これを使うとRefusing to load cask ... from untrusted tapを確認）。CI は非対話なのでbrew trustを仕込まない限り落ちるそのため
go install github.com/terraform-linters/tflint@latestに変更した。すぐ数行上のterraform-ls/tfsecと同じ方式で、Linux でも tflint が復活する。ローカルで v0.64.0（cask と同版）の動作を確認済み。Ubuntu / WSL: Homebrew 自体が古い
runner にプリインストールされた Homebrew は auto-update が無効で、formula JSON API のスキーマより古いと
unknown install step: runでca-certificatesの pour 中に落ちる。これでtmuxとgnupgが巻き添えになっていた。スクリプトは
brew upgradeは呼ぶがbrew updateを呼んでいなかったため Homebrew 本体が更新されない。update_homebrew()をcommon.shに追加し、3つの platform script から呼ぶようにした。その他
zsh/alias.zshのupdate-allにも tflint を追加（init script のコメントが「このリストと揃えろ」と指示しているため）。Concerns
bin/lint-shell（CI と同じコマンド）とbrew bundle listによるパース確認、およびgo installした tflint の実行確認まで。実際に通るかは CI の結果待ち。tflintformula が残っている可能性がある。go 版を PATH で優先させる前にbrew uninstall tflintが必要。References