2 depend or not 2 depend
david at cantrell.org.uk
Thu Feb 4 18:15:56 GMT 2010
On Thu, Feb 04, 2010 at 05:46:46PM +0000, Paulo Edgar Castro wrote:
> Our initial thought was to just run through the motions of the app
> Makefile which has defined these 148 modules with perl Makefile.PL
> --defaultdeps && make
> and wait for the modules to install.
> Then the penny droped and we realized that we were getting the latest
> versions of each module which was not what we wanted.
> We also though that we could force a specific version of a module
> installation with for example "install
> But then CPAN would go on installing the latest Test-0.69 when
> Test-Simple-0.62 explicitly depends on Test-0.66 and thus not ready yet
> for 0.69.
If you go through the dependency tree backwards - that is, generate your
entire tree, then first install the desired versions of the leaf nodes,
then the desired versions of the twigs they hang off, then the branches
that *they* hang off, and so on - then you should get the right
versions without CPAN.pm screwing it up.
CPANdeps <http://deps.cpantesters.org/> may be of some use, but don't
rely on it exclusively to figure out the dependency hierarchy, for two
* it prunes the tree so that any node only appears once - so if your
app depends on Foo, which depends on Bar and Baz, which both depend
on Quux, then it will only show Quux as a dependency of one of Bar
and Baz and not of both;
* it gives you a snapshot of *current* dependencies. If the deps have
changed between Bar version 1 that you want, and version 3 that's
currently on the CPAN, it can only show you the data for version 3.
> * Try to mirror that list using our own bastard version of CPAN with
> cpansite ?
That's definitely a better idea than doing it by hand, because at least
you only have the pain once - do it by hand this time and you'll have to
do it by hand again next time, but build a tool this time and you can
use the same tool next time.
There's some code here that might be a good starting point:
You might also want to talk to Schwern, as he was talking about doing
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