pi-mono/packages/coding-agent
Petr Houška 6454d07ec3
fix(coding-agent): start WSL interop helpers from / and report external editor failures (#11627)
Fixes #11592.

## Problem

WSL starts Windows programs in the current directory, translated to
`\\wsl.localhost\<distro>\<cwd>`. When that path exceeds MAX_PATH, every
Windows program fails to start with `Invalid argument`. pi inherits its
cwd when spawning `powershell.exe`, so in a deep directory:

- clipboard image paste returns `null` (the PowerShell backend fails,
stderr is discarded)
- copy via `powershell.exe` (WSL without WSLg) fails
- opening the browser for sign-in fails (`xdg-open` on WSL runs
`explorer.exe`)

Reproduced on WSL (FedoraLinux-44): `powershell.exe` and `cmd.exe` work
from a 225-char cwd and fail from 230. With an image on the Windows
clipboard, `readClipboardImage()` returns the PNG from `/tmp` and `null`
from a 245-char cwd; with this change it returns the PNG from both.
`LongPathsEnabled=1` does not help.

## Changes

- `runClipboardCommand` and `openBrowser` run from `/` on POSIX. These
tools never use the cwd (temp files are passed by absolute path), and
`/` is always the shortest UNC path. `tmpdir()` was not used because
`$TMPDIR` can itself be deep.
- The external editor keeps pi's cwd on purpose, so project-relative
paths and integrated terminals keep working. A Windows editor such as
`code` can still fail from a deep WSL directory, as with git's
`core.editor`. A comment documents this.
- External editor failures were silent: the UI redrew over the error
immediately. pi now shows `Failed to launch external editor: <cmd>`,
`External editor exited with code N; prompt unchanged`, or the signal
name. This shows in the status line for the main editor and inline in
the extension editor dialog.

## Testing

- New tests: clipboard commands run from `/` (POSIX); an editor that
cannot be launched is reported (POSIX); the existing failure test checks
the message.
- Verified on WSL by running the real modules: clipboard image paste
from a deep cwd, and editor success, exit code 1, launch failure, and
SIGTERM.
- On Windows, the 3 existing `external-editor.test.ts` tests already
fail on `main`: the editor command is split on spaces, so `C:\Program
Files\nodejs\node.exe` breaks. Not addressed here.

This PR is AI-generated.
2026-10-30 21:47:58 +01:00
..
docs docs(coding-agent): document which working directory resumed sessions use (#11617) 2026-10-30 17:22:05 +00:00
examples fix(tui,coding-agent): handle selection page keys in all scrolling lists 2026-10-28 19:05:21 +01:00
install-lock fix(coding-agent): update undici to 8.12.3 for security advisories 2026-10-26 13:50:55 +01:00
schemas feat(coding-agent): extensions changelog (#8790) 2026-10-28 11:25:04 +01:00
scripts docs(ai,coding-agent): generate models.json reference from schemas (#11038) 2026-10-16 21:53:00 +01:00
src fix(coding-agent): start WSL interop helpers from / and report external editor failures (#11627) 2026-10-30 21:47:58 +01:00
test fix(coding-agent): start WSL interop helpers from / and report external editor failures (#11627) 2026-10-30 21:47:58 +01:00
.gitignore Fix tool call ID normalization for cross-provider switches to Anthropic/GitHub Copilot 2026-01-13 04:07:10 +01:00
CHANGELOG.md fix(coding-agent): start WSL interop helpers from / and report external editor failures (#11627) 2026-10-30 21:47:58 +01:00
package.json fix(coding-agent): update undici to 8.12.3 for security advisories 2026-10-26 13:50:55 +01:00
README.md feat(coding-agent): add Nix flake (#9137) 2026-10-02 18:30:51 +02:00
tsconfig.build.json feat(coding-agent): remove the experimental server stack and the client, protocol, and server packages 2026-10-12 10:41:59 +00:00
tsconfig.examples.json chore: migrate pi packages to earendil works scope 2026-05-07 15:59:42 +02:00
vitest.config.ts fix: use bounded runtime paths for Unix sockets 2026-08-14 17:02:03 +03:00

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