88 lines
3.5 KiB
Markdown
88 lines
3.5 KiB
Markdown
# Phase 1: Minimal Viable Sandbox - Context
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**Gathered:** 2026-04-09
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**Status:** Ready for planning
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<domain>
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## Phase Boundary
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Produce a working `claudebox` command via Nix flake that launches Claude Code inside a bubblewrap sandbox with environment allowlisting, filesystem isolation, secret path hiding, and on-demand tool provisioning via comma/nix. User runs `claudebox` in any project directory and gets a fully functional Claude session with secrets invisible.
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</domain>
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<decisions>
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## Implementation Decisions
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### Argument Passthrough
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- **D-01:** Forward all unknown flags to `claude`. claudebox claims only its own flags (`--yes`, `--dry-run`, `--check`) and passes everything else through. No `--` separator required. `--dangerously-skip-permissions` is always injected.
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### nix-index Database
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- **D-02:** Use `comma-with-db` from the `nix-community/nix-index-database` flake. Self-contained — bundles the package index, no host dependency, no extra bind mount needed. DB updates when the flake input is bumped.
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### Environment Variables
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- **D-03:** Strict allowlist per SAND-03, plus a `CLAUDEBOX_EXTRA_ENV` escape hatch. Core allowlist always passes (HOME, PATH, TERM, EDITOR, LANG, LC_ALL, NIX_SSL_CERT_FILE, SSL_CERT_FILE, ANTHROPIC_API_KEY, USER, SHELL, XDG_RUNTIME_DIR). User can add extras at launch via `CLAUDEBOX_EXTRA_ENV="COLORTERM,NODE_OPTIONS"` — their responsibility to not leak secrets.
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- **D-04:** Sandbox-generated vars (TMPDIR=/tmp, etc.) are set via `--setenv`, never read from host.
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### Git Identity
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- **D-05:** Generate a minimal `.gitconfig` inside the sandbox at launch time. Reads `user.name` and `user.email` from the host's git config, writes them plus `safe.directory = *` into the sandbox's `~/.gitconfig`. No host `.gitconfig` mounted — avoids credential helper, pager, and alias breakage from missing binaries.
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### Claude's Discretion
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- Mount ordering strategy for CWD-under-HOME (bwrap specifics)
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- Exact tmpfs layout and /dev, /proc, /tmp setup
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- How `--clearenv` + `--setenv` are sequenced in the bwrap invocation
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- DNS resolution mount strategy (resolv.conf and its symlink targets)
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- SSL cert bundle path detection
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</decisions>
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<canonical_refs>
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## Canonical References
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**Downstream agents MUST read these before planning or implementing.**
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### Project Docs
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- `.planning/PROJECT.md` — Core value, constraints, key decisions
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- `.planning/REQUIREMENTS.md` — Full requirement list with IDs (SAND-*, TOOL-*, GIT-*, NIX-*, UX-*)
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- `.planning/ROADMAP.md` — Phase 1 success criteria and requirement mapping
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### Stack Research
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- `CLAUDE.md` §Technology Stack — writeShellApplication, bwrap flags, comma/nix-index, flake structure, PATH construction, testing strategy
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</canonical_refs>
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<code_context>
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## Existing Code Insights
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### Reusable Assets
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- None — greenfield project, only CLAUDE.md exists in the repo
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### Established Patterns
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- None yet — Phase 1 establishes all patterns
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### Integration Points
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- Nix flake as entry point (`nix run`, `nix profile install`)
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- `writeShellApplication` produces the claudebox script
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- bwrap is the sole runtime dependency for sandboxing
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</code_context>
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<specifics>
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## Specific Ideas
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- `CLAUDEBOX_EXTRA_ENV` is comma-separated, not space-separated
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- Git identity is read from host at launch time (not build time) so it works across machines
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- `comma-with-db` as flake input, not a nixpkgs package
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</specifics>
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<deferred>
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## Deferred Ideas
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None — discussion stayed within phase scope
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</deferred>
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---
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*Phase: 01-minimal-viable-sandbox*
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*Context gathered: 2026-04-09*
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