Add a "resolve" method to Path

[SniperSister]

Summary of Changes

I added a new "resolve" method to resolve relative paths without the need for the input path to be an absolute path in the first place. The path in question also doesn't need to exist beforehand, it's a virtual check.

This also allows a better fix for joomla/joomla-cms#24539 that doesn't break symlinks.

[HLeithner]

I think this will not work under windows.
I tested echo resolve('/var\../www///joomla'); and got \\var\..\www\joomla I'm not sure if this is true for posix

[wilsonge]

This also allows a better fix for joomla/joomla-cms#24539 that doesn't break symlinks.

I don't think this fixes that. I think people in that issue who have symlinks are largely symlink'ing /var/www/joomla/images to /data/joomla-images where they have larger disk attached to /data. That's why people in that issue were asking about whitelisted locations

Having said that this method seems logical and useful anyhow - just don't think you're going to fix the issue mentioned

[SniperSister]

I don't think this fixes that. I think people in that issue who have symlinks are largely symlink'ing /var/www/joomla/images to /data/joomla-images where they have larger disk attached to /data. That's why people in that issue were asking about whitelisted locations

It does fix it. We are running into the current issue because we are using realpath for relative path resolutions - however, realpath does also resolve symlinks and that's what's getting is into trouble here

[zero-24]

@wilsonge any follow up on this here form your site?

[wilsonge]

Nah feel free to merge. I've said my piece