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Date: Sat, 10 Apr 2010 15:45:20 -0700
From: Tim Kientzle <kientzle@freebsd.org>
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To: Julian Elischer <julian@elischer.org>
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Cc: ports@freebsd.org, FreeBSD Current <current@freebsd.org>
Subject: Re: ports and PBIs
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Julian Elischer wrote:
> On 4/10/10 12:07 PM, Tim Kientzle wrote:
>> [1] Actually, PBI might work just fine even for
>> embedded if we address the disk bloat issue. One
>> approach would be to make
>> /Package/Bar/libfoo-2.8.7.so
>> a symlink or hardlink to
>> /Package/Shared/libfoo-2.8.7.so-<MD5-hash>
>> This gives easy sharing of identical files.
> 
> yeah that's more or less what we were thinking..
> hardlinks allow you to garbage collect when the last pbi that needs 
> something is replaced/removed.

The point of /Package/Shared in this design is
basically that it provides a list of all of
the files that can be shared, so you
avoid doing a full disk search to identify other
places that might have this file.  You could
accomplish the same goal by building and
storing a database of sharable files somewhere,
of course.

(Curiously, no one has mentioned filesystem-level
deduping yet as the "big hammer" solution...  ;-)

The LD_LIBRARY_PATH issue is the most interesting
problem here.  I don't immediately see a solution that
doesn't include teaching ld-elf.so.1 about some form
of per-application library path.

Tim