Date: Fri, 13 Jun 2003 18:02:35 -0700 (PDT) From: John Polstra <jdp@polstra.com> To: hubs@freebsd.org Subject: Re: The recent thread... handling new releases Message-ID: <200306140102.h5E12ZgG010887@strings.polstra.com> In-Reply-To: <p05210620bb0e7675d934@[128.113.24.47]> References: <20030612180244.GG21995@electra.cse.Buffalo.EDU> <p05210620bb0e7675d934@[128.113.24.47]>
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In article <p05210620bb0e7675d934@[128.113.24.47]>,
Garance A Drosihn <drosih@rpi.edu> wrote:
> I have wondered if cvsup could be smart enough to download files
> under one name, and then afterwards (on a later run) know to just
> rename that file to the official name for a public release.
> Eg, some way to say
>
> if file .IMAGE001 exists
> and if the bytesize is 123456789
> and if the MD5 of it is f4f4acfc8322c267618f93c52d465e4c
> then rename .IMAGE001
> to 5.2-RELEASE-i386-disc1.iso
> endif
> <repeat for other images>
>
> Proceed with standard cvsup processing.
Hmm, I'm having trouble getting excited about putting that
functionality into CVSup. It just seems too application-specific.
What CVSup does is supposed to be conceptually simple: mirror files
from one place to another.
> This would at least reduce the exposure from people who say
> "A FILE EXISTS, THE RELEASE *MUST* HAVE HAPPENED!!!!", usually
> at the first millisecond that any official-looking filename
> appears on any ftp server.
I think you guys are making the problem more complicated than it
needs to be. Can't you do something like this?
- Put the new release into a directory named (for example)
".5.1-RELEASE-STAGING-AREA".
- Let all the bits trickle out to the mirrors.
- Any user dumb enough to download stuff from
".5.1-RELEASE-STAGING-AREA" will get what he deserves and
deserve what he gets.
- After the mirrors have had time to get all the bits, add a
symlink "5.1-RELEASE -> .5.1-RELEASE-STAGING-AREA".
- Presto, the release has appeared atomically.
John
--
John Polstra
John D. Polstra & Co., Inc. Seattle, Washington USA
"Two buttocks cannot avoid friction." -- Malawi saying
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