Refs #7756, #5607.
Problem: when a wrapper or another package manager provides Pi (mise, a
`PNPM_HOME` wrapper such as nub, Nix), `pi update` cannot update it and
prints "pi cannot self-update this installation." Users with several
machines have to remember which tool updates Pi on which machine.
Example:
```sh
export PI_SELF_UPDATE_COMMAND="mise use -g npm:{packageName}@{version}"
pi update
# Updating pi with mise use -g npm:@earendil-works/pi-coding-agent@1.4.0...
# Updated pi from 1.3.0 to 1.4.0
```
or in `~/.pi/agent/settings.json`:
```json
{ "selfUpdateCommand": ["nix", "profile", "upgrade", "pi"] }
```
Behavior:
- `pi update` still checks pi.dev first. The command runs only when a
newer release exists, or with `--force`, and the release note prints
first.
- Placeholders come from that release: `{packageName}`, `{version}`,
`{installSpec}` (`<packageName>@<version>`). A package rename announced
by pi.dev flows into them.
- `PI_SELF_UPDATE_COMMAND` takes precedence and is split on whitespace
(no quoting). The setting is argv, for arguments with spaces, and is
read only from global settings, so a project's `.pi/settings.json`
cannot inject a command.
- The configured command replaces Pi's own update logic for every
install method, including installer-managed installs: it is explicit
user intent.
- Exit code 0 does not prove an update. Pi reports "Updated pi from X to
Y" when its own `package.json` now shows Y (in-place updates) or when
`pi --version` from PATH reports Y (wrappers such as mise or Nix that
install each version into a new directory). Otherwise it warns: ``Ran
<cmd>, but `pi --version` reports X, not Y.``
- "cannot self-update this installation" now mentions the env var and
setting.
Docs: `docs/cli.md` (new "Custom update command" section),
`docs/settings.md`, `docs/environment-variables.md`, `--help` env list,
regenerated `schemas/settings.schema.json`.
Tests: unit tests for argv resolution and placeholders in
`test/config.test.ts`; CLI tests in `test/package-command-paths.test.ts`
for env precedence over the setting and the managed install, global-only
setting gated by the version check, and command failure. `npm run check`
passes.
Manual end-to-end check with real mise 2026.10.23 in a sandboxed HOME,
running this branch as the mise-installed 1.3.0 (`PI_PACKAGE_DIR`
pointing at mise's install):
| Scenario | Result |
|---|---|
| `mise use -g npm:{packageName}@{version}` | mise installs 1.4.0;
`Updated pi from 1.3.0 to 1.4.0` |
| Already 1.4.0 | `pi is already up to date (v1.4.0)`, mise not run |
| In-place `npm install -g --prefix <dir> {installSpec}` via the setting
| `Updated pi from 1.3.0 to 1.4.0` |
| Command `true` (exit 0, installs nothing) | ``Ran true, but `pi
--version` reports 1.3.0, not 1.4.0.`` |
This PR is AI-generated.
Fixes#7756.
Problem: `detectInstallMethod()` classifies any path containing `/pnpm/`
as pnpm. An install that only lives under `PNPM_HOME`, for example a
wrapper under `$PNPM_HOME/global-nub/5/node_modules/...`, is detected as
pnpm. `pi update` then correctly refuses to self-update (the path is not
under `pnpm root -g`), but `getSelfUpdateUnavailableInstruction()`
printed:
```
This installation is not managed by a global pnpm install. Update it with the package manager, wrapper, or source checkout that provides it.
```
Fix: name the package manager only when it owns the install (managed but
not writable). All other cases fall through to the neutral message:
```
Update @earendil-works/pi-coding-agent using the package manager, wrapper, or source checkout that provides this installation.
```
`detectInstallMethod()` is unchanged: every user-facing path already
goes through the ownership check, and returning `unknown` would trip the
Windows "only supported for npm and pnpm" guard with a worse message.
The update banner already says `Run pi update` and no longer suggests
`pnpm install -g`.
The pi.dev installer is not affected: it verifies npm ownership with
`npm ls -g` and never infers pnpm from paths.
Tests: regression test in `test/config.test.ts` (fails without the fix).
`npm run check` passes.
This PR is AI-generated.
Resolve the QuickJS wasm path once and spawn the bundled codemode worker
from an in-memory data: URL. Show a restart hint when errors occur after
the install changed on disk.
closes#10439
