getXdgDirectory ignores relative path in XDG_CACHE_HOME

[Gabriella439]

getXdgDirectory uses the fallback path whenever the environment variable is a relative path:

directory/System/Directory/Internal/Posix.hsc

Line 295 in 19d6dc0

Just path | isRelative path -> fallback'

However, this doesn't seem to match the XDG Base Directory Specification as far as I can tell

[Rufflewind]

There seems to be different versions of the spec floating around. Version 0.8 says:

All paths set in these environment variables must be absolute. If an implementation encounters a relative path in any of these variables it should consider the path invalid and ignore it.

I don't know which version is canonical.

[Gabriella439]

Oh, interesting. It looks like that changed at some point, because it's missing from the latest version: https://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html

[Rufflewind]

I asked the XDG mailing list a while back but never got a response. I'll assume basedir-spec-latest.html is the canonical version, as it's more prominently linked to than basedir-spec-0.8.html.

[Gabriella439]

Thank you for following up on this! 🙂

[phadej]

And now https://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html is down.

https://specifications.freedesktop.org/ however has

basedir-spec

version 0.7 (one page, split pages)

which says All paths set in these environment variables must be absolute. If an implementation encounters a relative path in any of these variables it should consider the path invalid and ignore it.

In https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html