bump-overlay-versions

name	bump-overlay-versions
description	Use when user asks to bump, update, or upgrade claude-code or codex versions in overlay.nix, or when checking if newer versions are available

Bump Overlay Versions

Overview

Updates claude-code and/or codex to latest versions in /etc/nixos/overlay.nix. Nix requires correct hashes which must be discovered through failed builds.

Quick Reference

Package	Check Latest	Hash Fields
claude-code	npm view @anthropic-ai/claude-code version	hash, npmDepsHash (keep empty)
codex	curl -s "https://api.github.com/repos/openai/codex/releases/latest" | jq -r '.tag_name'	hash, cargoHash

Workflow

1. Check Current vs Latest Versions

# Current versions are in overlay.nix claudeCodeVersion and codexVersion blocks
# Check latest:
npm view @anthropic-ai/claude-code version
curl -s "https://api.github.com/repos/openai/codex/releases/latest" | jq -r '.tag_name'
# codex tag format: rust-v0.92.0 -> version is 0.92.0

2. Update Version and Clear Hashes

In /etc/nixos/overlay.nix:

For claude-code:

claudeCodeVersion = {
  version = "X.Y.Z";        # Update to new version
  hash = "";                # Clear - will get from build error
  npmDepsHash = "";         # Keep empty (no npm deps)
};

For codex:

codexVersion = {
  version = "X.Y.Z";        # Update to new version (without rust-v prefix)
  hash = "";                # Clear - will get from build error
  cargoHash = "";           # Clear - will get from build error
};

3. Build to Get Hashes

just switch

The build will fail with hash mismatch errors showing the correct hash. Copy the got: hash value.

For codex: You'll need to run twice - once for hash (source), once for cargoHash (cargo deps).

4. Update with Correct Hashes

Replace empty strings with the hashes from build errors, then run just switch again.

Enable/Disable Overrides

The overlay uses boolean flags - set to false to use nixpkgs versions instead:

enableCodexOverride = true;       # Set false to use nixpkgs codex
enableClaudeCodeOverride = true;  # Set false to use nixpkgs claude-code

Never delete the override code - just toggle the flags.

File Location

/etc/nixos/overlay.nix