[Shalin-Shah-2002]

Issue for this PR

Fixes #50259

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

The global tmp directory is os.tmpdir()/opencode, one fixed name shared by every user of a machine, and the Global layer runs mkdir on it at startup. If anything else already owns that name, startup fails for everyone with EEXIST: file already exists, mkdir '/tmp/opencode', which is the error in the issue (the reporter's /tmp/opencode is a 0-byte file). If another user owns it as a directory, startup passes but later writes into it can fail.

On POSIX the tmp directory is now opencode-<uid>, so it can't collide with another user's or a stray entry. Windows already has a per-user temp directory and keeps opencode. The tmp path is read through Global, so the permission whitelist and the instructions text pick up the new name without other changes.

I don't know what created the stray file in the report, so this fixes the shared name and the crash, not that original cause. Anything that was left in the old /tmp/opencode is not migrated; it is only scratch space.

How did you verify your code works?

Added a test in packages/util/test/global.test.ts that puts a regular file named opencode in TMPDIR and builds the Global layer. Before the change it fails with the issue's EEXIST; after, it passes. The existing tests that pinned …/opencode (global-roots.test.ts, global.test.ts, cli/test/service.test.ts) now expect opencode-<uid>.

packages/util: 91 pass. packages/cli test/service.test.ts: 21 pass. Typecheck is clean in both, and the pre-push check passed. With a stray file at $TMPDIR/opencode, opencode debug paths now exits 0 and reports tmp as …/opencode-501.

I could only test on macOS with one user, so I simulated the occupied name with a file instead of a second Unix user.

Screenshots / recordings

N/A

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

🤖 Generated with Claude Code

https://claude.ai/code/session_01HfXsWoKF5h7tmdmyUEw1rD

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