GitHub page build failure (missing _include symlink) when specifying a source directory

[mnyrop]

• I believe this to be a bug, not a question about using Jekyll.
• I updated to the latest Jekyll (or) if on GitHub Pages to the latest github-pages
• I ran jekyll doctor to check my configuration
• I read the CONTRIBUTION file at https://jekyllrb.com/docs/contributing/
• This is a feature request.

---

• I am on (or have tested on) macOS 10+
• I am on (or have tested on) Debian/Ubuntu GNU/Linux
• I am on (or have tested on) Fedora GNU/Linux
• I am on (or have tested on) Arch GNU/Linux
• I am on (or have tested on) Other GNU/Linux
• I am on (or have tested on) Windows 10+

---

• I was trying to install.
• There is a broken Plugin API.
• I had an error on GitHub Pages, and I have reproduced it locally.
• I had an error on GitHub Pages, and GitHub Support said it was a Jekyll Bug.
• I had an error on GitHub Pages and I did not test it locally.
• I was trying to build.
• It was another bug.

My Reproduction Steps

• Build the jekyll site using the source directory src (works locally; builds without errors and passes tests)
• Push to origin master to have GitHub build the site with GhPages (page build failure, symlink missing)
• Try pushing only the compiled _site to gh-pages branch via rake task (page build failure, symlink missing)

Result:

Liquid Exception: Could not locate the included file 'banner.html' in any of 
["/home/travis/build/mnyrop/wax/_includes"]. Ensure it exists in one of those directories and,
if it is a symlink, does not point outside your site source. 
in src/about.md

(See line #672 in build Travis-CI log.)

Basically, gh-pages is not acknowledging my source directory and is looking for _includes in my jekyll root directory. (In this case, wax/_includes instead of wax/src/_includes).

Repository: https://github.com/mnyrop/wax

The Output I Wanted

Successful build on GitHub Pages.

[mnyrop]

Might be related to #7224 and #7228?

Also #6578.

[mnyrop]

Still failing on newest Jekyll release (3.8.4)

[pathawks]

GitHub Pages overrides source.
https://github.com/github/pages-gem/blob/master/lib/github-pages/configuration.rb#L38-L40

This is not a Jekyll bug, but a restriction of the GitHub Pages environment.

[mnyrop]

@pathawks Thanks for clarifying