El dom, 09-08-2009 a las 10:29 -0700, Dale Henrichs escribió:
> - Package to package dependencies. One can declare required packages
> like the
> following:
> 'Example-Core-anon.9'
> 'Example-Tests-anon.3' requires: 'Example-Core'
> 'Example-AddOn-anon.1' requires: 'Example-Tests'
> 'Example-UI-anon.1' requires: { 'OB'. 'Example-AddOn'. }
> From the above statements, the package load order is derived and used
> when you
> load the project:
> (ExampleProject version: '0.3') load
> It is also used to determine _which_ packages should be loaded when an
> expression like the following is executed:
> (ExampleProject version: '0.3') load: 'Example-AddOn'
> This statement causes 'Example-Core-anon.9', 'Example-Tests-anon.3',
> 'Example-AddOn-anon.1' to be loaded in order.
This is very good, one thing that the package management system of
Debian has is that you can indicate a minimal version for a required
package:
for example, following your code snippet:
'Example-Core-anon.9'
'Example-Tests-anon.3' requires: 'Example-Core' minVersion: 9
'Example-AddOn-anon.1' requires: 'Example-Tests' minVersion: 1 maxVersion: 3
'Example-UI-anon.1' requires: { 'OB' . 'Example-AddOn'. }
This way, the package system doesn't have to install a exact version if a group
of
versions of the package required can equally work. This permits to have a
package, say
5 of a package that have a new feature that I need in my image and not be
overwrote by
a dependency of other package that needs exactly version 3 that doesn't have
the feature
that I need.
Maybe Metacello has this functionality, but if not, it would be, I think, easy
to add it,
just a comparation that the version available in the system meets the criteria
stated by
the package dependency.
Also, a form to force the install a package even if not all the dependencies
are met is good,
in particular to test some experimental package.
For more information you can refer to the dpkg/deb/aptitude tools in the debian
system.
Of course that tools do a lot more but we don't need, at least for now, all the
features.
http://en.wikipedia.org/wiki/Aptitude_(program)
http://en.wikipedia.org/wiki/Deb_(file_format)
http://en.wikipedia.org/wiki/Dpkg
All of them are GPL but I think that a new implementation, without use the
code, and in another
language, using only the ideas, is permited and can be integrated in Pharo as
MIT code.
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