an archive-like task - python-doit

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Message from discussion an archive-like task
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From: Michael Gliwinski <Michael.Gliwin...@henderson-group.com>
Organization: Henderson Group
To: python-doit@googlegroups.com
Subject: Re: an archive-like task
Date: Wed, 28 Sep 2011 09:24:31 +0100
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On Tuesday 27 Sep 2011 17:09:40 Eduardo Schettino wrote:
>          # task that adds compiled file to lib
> 
> >          yield {
> >          
> >              'name': 'lib:' + fn,
> >              'actions': ['# add to lib command'],
> >              'file_dep': [lib, target],
> >              'uptodate': [True],
> >              # adding 'targets' on lib here can't work
> >              }
> > 
> > Any ideas how to prevent that last task from running if none of the deps
> > changed?
> 
> I didnt understand 100% the logic of what you trying to do... but i guess
> the main problem is setting 'lib' as a file_dep on the last task.
> 
> When lib doesnt exist is it required to run all add_to_lib tasks or the
> "create lib command" can create and add the initial compiled files?

Unfortunately the "create lib" command doesn't handle adding files, it just 
creates the initial file and fails if it already exists.

...
> 1) you just need to make sure the lib file exist, this could be done by
> adding a dependency to the task that creates it.

Will this be enough to ensure "add to lib" tasks are run when the library file 
is deleted?

> 2) 'uptodate':  [True] # is useless in this case. you can remove it.

Indeed, that was just one of the things I tried to prevent the task from 
executing each time, along with 'uptodate': [run_once].  BTW, is there any 
difference?

>          # task that adds compiled file to lib
>          yield {
>              'name': 'lib:' + fn,
>              'actions': ['# add to lib command'],
>              'file_dep': [target],
>              'task_dep': ['compile_p:lib'],
>              }
> 
> this solves your problem?

Almost, it prevents the task from running each time, but if the library file 
is deleted only the 'compile_p:lib' task is run (i.e. the individual "add to 
lib" tasks for each compiled file are not).

Why is 'lib' a problem as a file_dep?  Is it because the 'lib' file changes 
after adding each file?


-- 
Michael Gliwinski
Henderson Group Information Services
9-11 Hightown Avenue, Newtownabby, BT36 4RT
Phone: 028 9034 3319

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