Christopher Mühl
c5e8cca867
- Replace --bind ~/.claudebox + --symlink with direct --bind ~/.claude ~/.claude - Add compute_canonical_root() function using git rev-parse --git-common-dir - Add per-project INSTANCE_DIR via sha256sum[:16] of canonical git root - Overlay projects/ with per-project hash dir for isolated conversation history - Overlay history.jsonl and SANDBOX.md as file-level bind mounts - Update credential mount target from ~/.claudebox to ~/.claude - Add CLAUDE_JSON_FILE (~/.claude.json) detection and conditional bind mount - Remove stale CLAUDE.md injection logic (D-06: user's real CLAUDE.md used) - Update dry-run block and print_audit to reflect new mount layout - Update SANDBOX.md heredoc to remove ~/.claudebox reference
95 lines
3.5 KiB
Markdown
95 lines
3.5 KiB
Markdown
---
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phase: 01-minimal-viable-sandbox
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plan: 01
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subsystem: infra
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tags: [nix, bubblewrap, bwrap, sandbox, writeShellApplication, flake, comma-with-db]
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requires: []
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provides:
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- "claudebox command via nix build/run"
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- "bwrap sandbox with clearenv + env allowlist"
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- "filesystem isolation with secret path hiding"
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- "git identity forwarding via generated .gitconfig"
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- "comma/nix tool provisioning inside sandbox"
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affects: [02-verification-and-hardening]
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tech-stack:
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added: [bubblewrap, writeShellApplication, nix-index-database, comma-with-db]
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patterns: [clearenv-allowlist, tmpfs-root-selective-bind, exec-for-signal-passthrough]
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key-files:
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created: [flake.nix, claudebox.sh, flake.lock]
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modified: []
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key-decisions:
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- "Claude Code discovered from host PATH at runtime, not bundled as runtimeInput"
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- "Sandbox-generated vars (TMPDIR, XDG_RUNTIME_DIR) never read from host"
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- "CLAUDEBOX_EXTRA_ENV comma-separated escape hatch for user-added env vars"
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patterns-established:
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- "writeShellApplication + builtins.readFile: keep shell script separate for syntax highlighting and independent shellcheck"
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- "clearenv + setenv: start empty, allowlist explicitly"
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- "tmpfs root + selective bind-mounts: nothing visible unless explicitly mounted"
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- "exec bwrap: no intermediate shell, signals propagate, exit code passes through"
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requirements-completed: [SAND-01, SAND-02, SAND-03, SAND-04, SAND-05, SAND-06, SAND-07, SAND-08, SAND-09, SAND-10, SAND-11, SAND-12, SAND-13, SAND-14, SAND-15, TOOL-01, TOOL-02, TOOL-03, GIT-01, GIT-02, NIX-01, NIX-02, NIX-03, UX-06]
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duration: 1min
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completed: 2026-04-09
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---
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# Phase 1 Plan 01: Nix Flake and Sandbox Script Summary
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**Nix flake with writeShellApplication producing claudebox wrapper that runs Claude Code inside bwrap with clearenv, env allowlist, tmpfs root, secret hiding, git identity forwarding, and comma/nix tool access**
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## Performance
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- **Duration:** ~1 min
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- **Started:** 2026-04-09T09:10:55Z
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- **Completed:** 2026-04-09T09:12:10Z
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- **Tasks:** 2
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- **Files created:** 3 (flake.nix, claudebox.sh, flake.lock)
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## Accomplishments
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- Nix flake with 11 runtimeInputs (bubblewrap, coreutils, git, curl, jq, ripgrep, fd, nix, comma-with-db, bash, nodejs) and nix-index-database flake input
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- Shell script with complete bwrap invocation: clearenv, env allowlist with CLAUDEBOX_EXTRA_ENV escape hatch, tmpfs root, selective bind-mounts, git identity generation, secret path exclusion
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- `nix build` succeeds -- derivation builds and passes shellcheck
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Create flake.nix** - `0ed2d33` (feat)
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2. **Task 2: Create claudebox.sh** - `51dba04` (feat)
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3. **flake.lock generated by nix flake check** - `26bdf36` (chore)
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## Files Created/Modified
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- `flake.nix` - Nix flake with writeShellApplication, all runtimeInputs, nix-index-database input
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- `claudebox.sh` - bwrap sandbox script with clearenv, env allowlist, filesystem isolation, git identity
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- `flake.lock` - Pinned nixpkgs and nix-index-database versions
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## Decisions Made
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None - followed plan as specified.
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## Deviations from Plan
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None - plan executed exactly as written.
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## Issues Encountered
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None.
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## User Setup Required
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None - no external service configuration required.
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## Next Phase Readiness
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- claudebox builds successfully via `nix build`
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- Ready for 01-02 (verification and manual testing)
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- Requires `claude` to be available on host PATH for runtime use
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## Self-Check: PASSED
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All 3 files exist. All 3 commits verified.
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---
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*Phase: 01-minimal-viable-sandbox*
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*Completed: 2026-04-09*
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