From: Ara.T.Howard@...
Date: 2004-10-28T23:04:01+09:00
Subject: Re: Gems as key? Re: The real Ruby vs. Python.

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On Thu, 28 Oct 2004, Mauricio [iso-8859-1] Fern=E1ndez wrote:

> On Thu, Oct 28, 2004 at 09:08:08PM +0900, David A. Black wrote:
>> On Thu, 28 Oct 2004, Mauricio Fern=E1ndez wrote:
>>
>>> If you really want to use rpa-base (maybe you need atomicity or strong
>>> dependency management?), take a look at the above link and feel free to
>>> ask :)
>>
>> Clarification, in case anyone misunderstands:  I don't know what your
>> threshold is for "strong", but Ruby Gems has dependency management,
>> and I haven't seen anything non-strong about it.
>
> "Strong dependency management" means that the system ensures no invalid
> state (where the dependencies are not fully satisfied) can be reached.
> In that sense, RubyGems' dependency management isn't "strong".
>
> The problems are fairly subtle and easy to overlook; I myself didn't
> notice them at first when working on rpa-base.
>
> RubyGems' versioning model makes it difficult to track reverse
> dependencies: currently user intervention is required to ensure no
> dependencies are broken on uninstall, and the installation/removal
> of a RubyGems package plus its dependencies isn't performed as a
> transaction. There are also some essentially unsolvable issues at runtime
> (unsatisfiable dependencies).

when a package is installed - do you store dags of the dependancies somewhe=
re
then?  i guess it would need to be a single dag (at least logically) so you
could detect problems on uninstall huh?

-a
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| EMAIL   :: Ara [dot] T [dot] Howard [at] noaa [dot] gov
| PHONE   :: 303.497.6469
| When you do something, you should burn yourself completely, like a good
| bonfire, leaving no trace of yourself.  --Shunryu Suzuki
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