[Scons-users] check target must be build / is up-to-date

[Philipp Kraus]

Sorry, a little more detail:

My problem is that I use in my two builders (extract & download) something like this:

x = env.Download(....)
env.Extract("extractdir", x)

but if the download target x is up-to-date, the builder does not create any file, because it is nothing to do, so
the extract builder fails, because no file exists, so I need a check like

x = env.Download(..)
if fileexists(x) :
   env.Extract(x)

on the else part everything is fine, so there is nothing to do. I have tested my download builder with the call, that 
if all is up-to-date the emitter returns a None type, but IMHO this is a bad style.
I need a tip to do a correct result of the builder, if the target exists physical and only than I can call the extract builder. 
The problem is the difference between physical file and URL. The problem exists only if I use the download builder
in a depend build structure

Thanks

Phil




Am 21.06.2013 um 00:51 schrieb Bill Deegan:


> Phil,

> 

> What's the do something if it must be built? And the not build action?

> Knowing that will help with how it might be done.

> 

> You can add a postaction to the action that does this for the positive case, but not really sure how you'd do the negative?

> 

> -Bill

> 

> 

> 

> On Thu, Jun 20, 2013 at 3:21 PM, Philipp Kraus <philipp.kraus at flashpixx.de> wrote:

> Hello,

> 

> can I check if a target must be build again?

> I have got something like

> 

> x = env.Builder("test", [sources])

> if x.must_build() :

>      do something if the target must be build

> else :

>      do something if the target is up-to-date

> 

> Thanks

> 

> Phil

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