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Opencode bash tool spawn user commands using /bin/sh what is not bash :-) #3479
Description
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I'm expecting from bash tools to execute at least bash, or default process.env.SHELL but sh feels pretty outdated for me.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
Reacted by Bernat Pericàs, Simon Spiridonov and Pablo De Tezanos-Pinto
Activity
[-]Opencode bash tool spawn user commands using `/bin/sh` what is not bash!!!![/-][+]Opencode bash tool spawn user commands using `/bin/sh` what is not bash :-)[/+]github-actions commentedon Oct 27, 2025
This issue might be a duplicate of existing issues. Please check:
Feel free to ignore if none of these address your specific case.
rekram1-node commentedon Oct 27, 2025
yeah this is good point
feat: use default shell on nix env (anomalyco#3479)
SamSpiri commentedon Nov 18, 2025
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.
LankyMoose commentedon Oct 6, 2026
windows user here - still not solved T.T