Variables available when building static sites using jekyll and github pages

Question

When building a website using github pages and jekyll, we can use variable like site.github.repository_name etc. Where these variables values are furnished by github pages when building the site. But I cannot find a comprehensive list of these variables in either documentation for github pages nor in pages about github pages in jekyll documentation.

I have already checked in

• https://jekyllrb.com/docs/github-pages/
• https://jekyllrb.com/docs/variables/
• https://docs.github.com/en/free-pro-team@latest/github/working-with-github-pages/about-github-pages-and-jekyll

Answer 1

GitHub Pages use some plugins that are enabled by default and cannot be disabled. One of them is jekyll-github-metadata.

Which, as stated in the description:

• Propagates the site.github namespace with repository metadata
• Sets site.title as the repository name, if none is set
• Sets site.description as the repository tagline if none is set
• Sets site.url as the GitHub Pages domain (cname or user domain), if none is set
• Sets site.baseurl as the project name for project pages if none is set

site.github.repository_name comes from the repository metadata mentioned above, along with site.github.wiki_url and lots of other stuff.