Redirect issues with case insensitivity

[akoeplinger]

This relates to jekyll/jekyll#3035.

On my site, the download page has the following front matter:

---
title: Downloads page
permalink: /download/
redirect_from: /Download/

---

The redirect is there to not break existing links from before the site was on Jekyll.

This works fine for me locally on Linux and when the site is hosted on GitHub Pages, but recently a user on Mac OSX told me he got into a redirect loop when locally serving the site. Turns out, as HFS+ is case insensitive by default the redirect page actually overrode the "real" page and essentially redirected to itself.

I know there might not be a good solution for that problem, but ideally it'd prefer the "real" page and just ignore the redirect instead of overwriting the file.

[parkr]

@akoeplinger - is this fixed with that Doctor command?

[jekyllbot]

This issue has been automatically marked as stale because it has not been commented on for at least
three months.

The resources of the Jekyll team are limited, and so we are asking for your help.

If you can still reproduce this error on the

3.1-stable

or

master

branch,
please reply with all of the information you have about it in order to keep the issue open.

If this is a feature request, please consider building it first as a plugin. Jekyll 3 introduced
hooks which provide convenient access points throughout
the Jekyll build pipeline whereby most needs can be fulfilled. If this is something that cannot be
built as a plugin, then please provide more information about why in order to keep this issue open.

Thank you for all your contributions.

[parkr]

We'll incorporate this into jekyll doctor. For now, filesystems be filesystems. 🐉