Update local Nix package versions and resolve hashes via nix build.
npx skills add https://github.com/iamruinous/nix-config --skill update-package
Please help me install this Agent Skill. Skill: update-package Source: https://github.com/iamruinous/nix-config/tree/main/.opencode/skills/update-package Command: npx skills add https://github.com/iamruinous/nix-config --skill update-package
Updating local Nix packages in packages/ can be error-prone due to manual hash management and tag formatting. This skill automates the version bump and hash resolution to keep builds reproducible across environments.
Run the skill with the package name and new version to update, for example forgejo-mcp 2.6.0.
High-intent search queries and answers about installing and using this skill.
To update a Nix package version and fix the hash, you can automate the process by editing default.nix to bump the version, replacing hashes with placeholders like lib.fakeHash, and running nix build to resolve the correct values.
The best way to handle Nix hash placeholders during a version bump is to replace source and dependency hashes with placeholders, then run a guided nix build to fetch and update the correct hash values iteratively.
A Nix build fails with a hash mismatch after a version bump because the source hash changed. You need to replace the old hash with a placeholder and run nix build to derive the new correct hash for the updated package.
Yes, you can normalize tags when updating local Nix packages in the packages/ directory. The process strips leading characters like 'v' from version tags if needed to ensure correct formatting during the version bump.
Yes, this Nix package update workflow supports common fetch methods. It guides you through editing default.nix, managing hash placeholders, and running nix build to resolve correct hashes across various fetch techniques.
Before automating Nix package version bumps, you need a local Nix environment with packages defined in a packages/ directory, and the default.nix file for the target package must be accessible for editing and running nix build.
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