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647deed2d9
Add misc/install-git-hooks.go and misc/git_hook/ to the OSS repo, adapted from the corp repo. The primary motivation is Change-Id generation in commit messages, which provides a persistent identifier for a change across cherry-picks between branches. The installer uses "git rev-parse --git-common-dir" instead of go-git to find the hooks directory, avoiding a new direct dependency while still supporting worktrees. Hooks included: - commit-msg: adds Change-Id trailer - pre-commit: blocks NOCOMMIT / DO NOT SUBMIT markers - pre-push: blocks local-directory replace directives in go.mod - post-checkout: warns when the hook binary is outdated Also update docs/commit-messages.md to reflect that Change-Id is no longer optional in the OSS repo. Updates tailscale/corp#39860 Change-Id: I09066b889118840c0ec6995cc03a9cf464740ffa Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>