ruby function adding pkg exclusion if not already exists in each repo defined in repo file

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04-10-2024

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Streamlining Ruby Package Exclusions: A Function for Efficient Repo Management

Managing multiple repositories with specific package exclusions can be tedious and error-prone. This article explores a simple Ruby function designed to automate the process of adding package exclusions to repositories, ensuring consistent and efficient management.

The Problem:

Imagine you have a configuration file (e.g., repos.yml) containing a list of repositories, each with its own set of package exclusions. You need a way to programmatically add new package exclusions to each repository, while avoiding duplicates.

Scenario:

Let's say our repos.yml looks like this:

repositories:
  - name: repo1
    pkg_exclusions:
      - pkg-a
      - pkg-b
  - name: repo2
    pkg_exclusions:
      - pkg-c

We want to add a new exclusion, pkg-d, to both repo1 and repo2 without manually editing the file and ensuring it's only added once.

Solution:

Here's a Ruby function that solves this problem:

require 'yaml'

def add_pkg_exclusion(repos_file, new_exclusion)
  repos = YAML.load_file(repos_file)

  repos['repositories'].each do |repo|
    unless repo['pkg_exclusions'].include?(new_exclusion)
      repo['pkg_exclusions'] << new_exclusion
    end
  end

  File.open(repos_file, 'w') { |file| YAML.dump(repos, file) }
end

# Example usage:
repos_file = 'repos.yml'
new_exclusion = 'pkg-d'

add_pkg_exclusion(repos_file, new_exclusion)

Explanation:

1. Loading the YAML file: The function loads the repos.yml file using the YAML.load_file method.
2. Iterating through repositories: It loops through each repository in the repositories array.
3. Checking for existing exclusion: The function checks if the new exclusion already exists in the pkg_exclusions array for the current repository using include?.
4. Adding the exclusion: If the exclusion is not found, it's appended to the pkg_exclusions array using <<.
5. Writing the updated YAML: The modified YAML data is written back to the repos.yml file using YAML.dump and File.open.

Benefits:

• Automation: Automates the process of adding exclusions, eliminating manual editing.
• Consistency: Ensures that new exclusions are added to all relevant repositories.
• Error prevention: Prevents accidental duplicates by checking for existing exclusions.

Further Enhancements:

• Error handling: Add error handling for cases where the file cannot be read or written.
• Multiple exclusions: Modify the function to accept an array of new exclusions.
• Dynamically retrieving file path: Allow the file path to be passed as an argument.

Conclusion:

This simple Ruby function effectively streamlines the process of adding package exclusions to multiple repositories, reducing the risk of errors and improving efficiency. By leveraging automation and a clear, readable code structure, this solution helps maintain consistency and streamline your repository management workflow.