Date: Fri, 14 Jul 1995 16:50:38 -0700 From: asami@cs.berkeley.edu (Satoshi Asami) To: knarf@nasim.cube.net Cc: freebsd-ports@freebsd.org Subject: Re: diffs and checksums Message-ID: <199507142350.QAA15744@silvia.HIP.Berkeley.EDU> In-Reply-To: <3u4ete$shi@nasim.nasim.cube.net> (knarf@nasim.cube.net)
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* > Also, we should be able to save space on wcarchive (and mirror sites)
* > by doing znew --best on all the distfiles.
*
* I don't think it's worth the CPU usage using --best. But let us discuss
* this later. ;)
I mean we put tarfiles that have been znew --best'd on wcarchive, and
every mirror site will pick them up. So the CPU is used only on one
site (probably thud), and all the mirror sites can save space. How's
that now? :)
* > The only problem is, how? I couldn't come up with a way to implement
* > this without having to gzcat the file every time a user types "make
* > <something>" ('cause most of the targets depend on "checksum"), or
* > forcing a znew from bsd.port.mk.
*
* Something like work/.checksum.done would cure this problem, wouldn't
* it? Hmm, work/ may not exist at this time, then what about
* distfiles/.filename.ok ? Again a bad idea if someone mirrores these
* files. Create the work directory with the ckecksum target?
Um, you are confusing yourself here. Why would someone mirror a file
like that unless I screw up and put that (as well as the distfiles) on
wcarchive? ;)
Anyway, the problem is that the tarfile may have changed without a
name change (that's really the whole point of checksumming). Having a
cookie won't really help alleviate this problem, because it won't
guarantee anything except that the checksum was once correct. Think
of this sequence:
(1) Joe user sups ports/games/coolgame
(2) Joe user does a make, it fetches the tarfile, checksum is ok and
builds the cool game
(3) Joe user sups ports/games/coolgame again (probably a nightly sup),
the original file has changed without name change and there is a
new pre-install target.
(4) Joe user types make install, and it bombs because there is a
checksum cookie but the extracted source doesn't match the
Makefile anymore!
Satoshi
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