Ngicks Dotfiles Nix Update Hash

Nix Update Hash

Compute correct hashes for Nix package definitions.

Commands

Vendor Hash (for buildGoModule packages)

Computes the correct vendorHash by building with lib.fakeHash and extracting the real hash.

Single package:

"$SKILL_DIR/nix-update-hash.sh" vendor <pkgs-dir> <pkg-name>

All packages in directory:

"$SKILL_DIR/nix-update-hash.sh" vendor <pkgs-dir>

Examples:

# Single package — resolves to nix-craft/pkgs/lsp-gw.nix
"$SKILL_DIR/nix-update-hash.sh" vendor nix-craft/pkgs lsp-gw

# All .nix files in the directory
"$SKILL_DIR/nix-update-hash.sh" vendor nix-craft/pkgs

After getting the hash, update the vendorHash field in the .nix file.

GitHub Source Hash

Prefetches a GitHub repo at a specific revision and returns the hash:

"$SKILL_DIR/nix-update-hash.sh" github <owner> <repo> <rev>

Example:

"$SKILL_DIR/nix-update-hash.sh" github neovim go-client v1.2.3

Workflow

1. Identify the Nix package file that needs a hash update
2. Run the appropriate subcommand to compute the correct hash
3. Update the hash field in the .nix file with the result

Output

Both commands print the hash string to stdout (e.g., sha256-...). Errors go to stderr with a non-zero exit code.

Notes

• The vendor subcommand requires nix-build and access to <nixpkgs>
• The github subcommand requires nix flake prefetch (experimental features: nix-command, flakes) and jq
• Vendor hash computation involves a full build attempt, so it may take some time

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