Add warning that only things in the home folder can be cached (_cci1/how-cache-works.md) about circleci-docs

[felicianotech]

Hey so to be clear, the rule isn't that something needs to be in $HOME to be cached but rather needs to be owned by the ubuntu user correct? Does the group matter at all?

[levlaz]

That is right, just things owned by ubuntu. However you need to be careful.
For example if you chown -R ubunut:ubuntu / and try to cache root it will
not work (and even if it did it would be a 60+GB cache that would take two
hours to restore.)

This is why to be safe we just tell people to install things into $HOME and
then on a case by case basis chown the file if you absolutely must cache
it.

On Fri, Jun 3, 2016 at 2:11 PM Ricardo N Feliciano [email protected]
wrote:

Hey so to be clear, the rule isn't that something needs to be in $HOME to
be cached but rather needs to be owned by the ubuntu user correct? Does
the group matter at all?

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[eric-hu]

@levlaz out of curiosity, are there other reasons that taking ownership of / would fail besides size limitations?

[levlaz]

Yes, there are some files and directories that you cannot actually own as
the ubuntu user even if you chown them, so this will cause a failure.

On Mon, Jun 6, 2016 at 7:36 AM eric-hu [email protected] wrote:

@levlaz https://github.com/levlaz out of curiosity, are there other
reasons that taking ownership of / would fail besides size limitations?

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[smart-alek]

More context here.

[smart-alek]

This might still be applicable to 2.0, but closing for now unless I hear otherwise from @eric-hu or @levlaz.