cache: Set default cache path based on $USER

[Sircular]

Change the default cache directory to $TMPDIR/hugo_cache_$USER, so that multi-user systems do not have caches that interfere with each other. The other cache-choosing logic (e.g. Netlify exceptions, configuration options) are not affected.

Fixes #7391

[CLAassistant]

All committers have signed the CLA.

[bep]

Thanks for this.

I can merge this, but

• You need to update the flag documentation in the code (

  hugo/commands/commandeer.go

  Line 524 in 7377970

  cmd.Flags().StringP("cacheDir", "", "", "filesystem path to cache directory. Defaults: $TMPDIR/hugo_cache/")

  ) and not in the auto generated MD files.
• Also, I think it's USERNAME on Windows? So maybe check if that's the case, and add a check for that if USER is not found.

[jmooring]

On Windows 11, the cache directory is within the user's profile, and it's been that way since Windows 7 (and maybe earlier). For example:

C:\Users\joe\AppData\Local\Temp\hugo_cache

So if $USER doesn't exist, don't bother appending the user name.

[bep]

OK, I'll merge -- the MD files will be overwritten anyhow.

[github-actions]

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