nix: node_modules hash mismatch and bun version constraint too strict for some nixpkgs-unstable snapshots #27

Description

Environment

• nixpkgs-unstable (mirror: USTC, bun 1.3.13)
• System: x86_64-linux

Problem 1: node_modules hash mismatch

When building from nixpkgs-unstable where bun is at 1.3.13 (vs the expected ^1.3.14 in the project),
the node_modules derivation produces a different hash than the one locked in nix/hashes.json.

Error:
hash mismatch in fixed-output derivation:
specified: sha256-OttgLsPJSYW1b9RGqiYSi7qPdDC3GuD2FE7k5tPe6Iw=
got: sha256-vB4imi5LtCxnDuOaJFQh+asK51RUDCnIVCkIzBQN12o=

Problem 2: bun version check too strict

The build script in packages/script/src/index.ts requires bun@^1.3.14,
but the current nixpkgs-unstable ships bun 1.3.13, causing the build to fail:

error: This script requires bun@^1.3.14, but you are using bun@1.3.13

Workaround

I forked the repo and:

1. Updated nix/hashes.json x86_64-linux hash to the got value
2. Added a patchPhase in nix/deepagent-code.nix to relax the bun version check to ^1.3.13

Suggestion

The hashes.json approach is fragile because it pins a hash tied to a specific
nixpkgs snapshot. Consider either:

• Using a hash derivation approach that tolerates minor bun version differences
• Or documenting how to regenerate hashes.json

Happy to open a PR for the bun version check fix.

Plugins

No response

DeepAgent Code version

No response

Steps to reproduce

No response

Screenshot and/or share link

No response

Operating System

NixOS 26.05 (Yarara)

Terminal

Kitty