Update Nix Flake

Update Nix Flake

This skill covers Specture's repo-specific Nix packaging workflow.

Use it when:

• flake.nix changes
• go.mod or go.sum changes
• Nix builds fail because vendorHash is stale
• release or packaging work touches the flake

Rules

• Keep flake.nix and Go module metadata in sync.
• Do not run go mod vendor. This repository does not keep a vendored tree.
• Prefer the repo's normal development workflow for everything else. This skill is only for the Nix-specific parts.

Updating vendorHash

When Go dependencies change, refresh vendorHash in flake.nix:

1. Set vendorHash = "";.
2. Run nix build.
3. Read the error output and copy the got: hash.
4. Replace the empty vendorHash with that hash.
5. Run nix build again to verify the flake succeeds.

Expected error shape:

specified: sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=
got: sha256-ZknVM8bMM0kLIbuV4Bv4XsbgtyhlKyP7p2AVOE1k0GA=

Use the got: value.

Validation Checklist

• flake.nix still evaluates
• nix build succeeds
• vendorHash matches the current module graph
• no vendor/ directory was added

Notes

• flake.nix currently builds the CLI with buildGoModule.
• The flake also defines the default package, app, and dev shell, so keep those intact unless the task requires changing them.