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## Summary
The local sandbox provider hard-codes `/bin/bash` at three call sites in
`fabro-sandbox/src/local.rs` (`exec_command`, `exec_command_streaming`,
`spawn_stdio_process`). NixOS doesn't ship `/bin/bash` — only `/bin/sh`
and `/usr/bin/env` are managed under `/`, with bash living on `PATH` at
`/run/current-system/sw/bin/bash`. The result: a first run on NixOS dies
on the very first sandbox call (the git probe) with `No such file or
directory (os error 2)`, surfaced as `sandbox git unavailable`.
## Fix
Switch all three sites from `Command::new("/bin/bash")` to
`Command::new("bash")`. `PATH` is already preserved by
`filtered_env_vars` (and explicitly tested at `local.rs:1164`), so
libc's `execvp` lookup resolves bash on every distribution that has it
installed, including NixOS, without forcing users to symlink
`/bin/bash`.
The `/bin/bash` references in `docker.rs` are unaffected — those execute
inside containers where the path always exists.
## Credit
Diagnosis and proposed fix by @allouis in #232 — they ran the
PATH-lookup variant locally on NixOS 26.05 and confirmed workflows ran
cleanly without the symlink workaround.
Closes #232
---
[](https://github.com/EveryInc/compound-engineering-plugin)
🤖 Generated with Claude Opus 4.7 (1M context, extended thinking) via
[Claude Code](https://claude.com/claude-code)
Co-authored-by: Fabien O'Carroll <3218915+allouis@users.noreply.github.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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| .. | ||
| build-support | ||
| fabro-acp | ||
| fabro-agent | ||
| fabro-api | ||
| fabro-auth | ||
| fabro-checkpoint | ||
| fabro-cli | ||
| fabro-client | ||
| fabro-config | ||
| fabro-core | ||
| fabro-dev | ||
| fabro-devcontainer | ||
| fabro-dump | ||
| fabro-github | ||
| fabro-graphviz | ||
| fabro-hooks | ||
| fabro-http | ||
| fabro-install | ||
| fabro-interview | ||
| fabro-llm | ||
| fabro-macros | ||
| fabro-manifest | ||
| fabro-mcp | ||
| fabro-mcp-server | ||
| fabro-model | ||
| fabro-oauth | ||
| fabro-options-metadata | ||
| fabro-proc | ||
| fabro-redact | ||
| fabro-sandbox | ||
| fabro-server | ||
| fabro-slack | ||
| fabro-spa | ||
| fabro-static | ||
| fabro-store | ||
| fabro-telemetry | ||
| fabro-template | ||
| fabro-test | ||
| fabro-tracker | ||
| fabro-types | ||
| fabro-util | ||
| fabro-validate | ||
| fabro-vault | ||
| fabro-workflow | ||