sds/overcommit · error · RuntimeError

This expects a block!

Error message

This expects a block!

What it means

Error "This expects a block!" thrown in sds/overcommit.

Source

Thrown at lib/overcommit/hook/prepare_commit_msg/base.rb:14

# frozen_string_literal: true

require 'forwardable'

module Overcommit::Hook::PrepareCommitMsg
  # Functionality common to all prepare-commit-msg hooks.
  class Base < Overcommit::Hook::Base
    extend Forwardable

    def_delegators :@context,
                   :commit_message_filename, :commit_message_source, :commit, :lock

    def modify_commit_message
      raise 'This expects a block!' unless block_given?

      # NOTE: this assumes all the hooks of the same type share the context's
      # memory. If that's not the case, this won't work.
      lock.synchronize do
        contents = File.read(commit_message_filename)
        File.open(commit_message_filename, 'w') do |f|
          f << (yield contents)
        end
      end
    end
  end
end

View on GitHub (pinned to fee0cd74b2)

Solutions

1. Call the method with a block (e.g. `modify_commit_message { |msg| ... }`) as required by the prepare-commit-msg base API.
2. Review your custom prepare-commit-msg hook code to ensure every call into this helper passes a block.

When it happens

Trigger: Thrown at lib/overcommit/hook/prepare_commit_msg/base.rb:14 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of sds/overcommit@fee0cd74b2 (2026-08-23). Data as JSON: /api/errors/afda3ada2f486494. Report an issue: GitHub.