opencode auth login crashes on Linux without xdg-open #52548

Description

On a Linux box without xdg-utils (SSH, containers), opencode auth login prints the authorization URL and then exits with Error: Executable not found in $PATH: "xdg-open" and a stack trace, so the login can't be finished.

openUrl in packages/cli/src/ui/prompt.ts wraps the launch in Effect.promise(...).pipe(Effect.ignore). Effect.promise turns the rejection into a defect, and Effect.ignore doesn't catch defects. The compiled binary has no bundled xdg-open, so open falls back to the system one. Someone posted the same trace in #49446 (that issue is about opencode web on v1).

◇  Authorization started
●  Enter code: XXXX-XXXX
●  https://opencode.ai/console/device?user_code=XXXX-XXXX&client_id=opencode-cli
Error: Executable not found in $PATH: "xdg-open"
    at spawn (unknown)
    at spawn (node:child_process:721:35)
    at cli.prompt.open-url (/$bunfs/root/chunk-v0je57yf.js:6:7614)
    at cli.auth.login.oauth (/$bunfs/root/chunk-v0je57yf.js:6:6699)
    at cli.auth.login.authenticate (/$bunfs/root/chunk-v0je57yf.js:6:5199)
    at cli.auth.login.run (/$bunfs/root/chunk-v0je57yf.js:6:4663)

Plugins

No response

OpenCode version

2.0.21 (the same code is on v2 at 4f37be6)

Steps to reproduce

1. On Linux, make sure xdg-open is not on PATH.
2. Run opencode auth login opencode in a terminal.
3. Choose "OpenCode Console account".

Screenshot and/or share link

No response

Operating System

Ubuntu 24.04

Terminal

SSH session