[ccache] base_dir and symbolic links

[Andreas Wettstein]

Hello Joel,

> https://www.mail-archive.com/ccache@lists.samba.org/msg00802.html

Thank you.  It is trickier than I thought.

> ccache has a test suite and it fails like this with your patch:

Sorry, I missed the test directory.  Attached is a modified patch, which
fixes this issue and includes tests as well.

> If I understand your setup correctly, would it be possible to instead put
> /reference, /user1 and /user2 under a /common directory and then let the
> users set basedir to /common?

Technically, yes, however, the file system layout is not under my
control.  It also would be tedious, as there are many more users, their
individual directories can be huge, and the ability to benefit from
ccache is just a minor issue in the overall picture.

Andreas

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