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

[Bill Deegan]

Phil,

I take it that you are removing the downloaded file with your extract logic
then?

-Bill


On Thu, Jun 20, 2013 at 4:14 PM, Philipp Kraus
<philipp.kraus at flashpixx.de>wrote:


> 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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>>

>

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