Opencode bash tool spawn user commands using `/bin/sh` what is not bash :-)

[istarkov]

Description

The issue seems like is in the following lines

https://github.com/sst/opencode/blob/dev/packages/opencode/src/tool/bash.ts#L149-L154

Here - shell: true

**shell **- If true, runs command inside of a shell. Uses '/bin/sh' on Unix, and process.env.ComSpec on Windows. A different shell can be specified as a string.

I'm expecting from bash tools to execute at least bash, or default process.env.SHELL but sh feels pretty outdated for me.

Something like this feels more suitable (or check bash existance and use it if it exists in the PATH)

const defaultShell = process.platform === "win32"
  ? true // process.env.ComSpec on Windows
  : process.env.SHELL ?? true // $SHELL - *default shell for new sessions* if set, otherwise /bun/sh

const proc = spawn(params.command, {
  // use the user's login shell (or sensible fallback) rather than the system /bin/sh default
  shell: defaultShell,
  cwd: Instance.directory,
  stdio: ["ignore", "pipe", "pipe"],
  detached: process.platform !== "win32",
})

OpenCode version

0.15.18

Steps to reproduce

In opencode write following prompt

---

Run following bash command

pid=$$
echo "$(ps -p "$pid" -o comm=)"

The result is

/bin/sh on linux

---

Screenshot and/or share link

Share links doesn't work for me for unknown reason

Operating System

MacOs

Terminal

ITERM 2

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• PATH is not inherited from invoking shell #2202: PATH is not inherited from invoking shell - addresses the same underlying problem where OpenCode uses /bin/sh instead of respecting the user's shell environment
• [Feature] Allow the user to run their favorite shell in opencode #3228: [Feature] Allow the user to run their favorite shell in opencode - broader feature request that would solve this issue by allowing shell configuration

Feel free to ignore if none of these address your specific case.

[rekram1-node]

yeah this is good point

[SamSpiri]

A tool is called literally "bash". When AI is calling it with bash code it often fails, because it prepares bash code, but it is being executed with sh.