[Scons-users] File only rebased to variant dir if Command action is a build function?

[Damjan Jovanovic]

Great
Thank you!

On Sun, Jul 12, 2020 at 9:48 PM Hans-Christian Wild <hchr.wild at gmail.com>
wrote:

> Hi Damjan,
>
> to me it looks like the problem is that the expression
> `str(env['EXTRACT_DIR'])` in the print(...) statement will be processed by
> python already when the SConscript file itself is  processed and not later,
> when scons actually executes the command.
>
> if I change the print statement e.g. to this
>
>     "echo Extracting to (string action): $EXTRACT_DIR",
>
> the output is correct
>
> echo Extracting to (string action): build\External
> Extracting to (string action): "build\External"
>
> On Sun, Jul 12, 2020 at 4:42 PM Damjan Jovanovic <damjan.jov at gmail.com>
> wrote:
>
>> Hi
>>
>> In a hierarchical build with a separate output directory, a Command()'s
>> action will only see a File() in its env rebased to the variant dir if it's
>> a function action, not a string action.
>>
>> The example below prints:
>> Extracting to (string action) External [WRONG]
>> Extracting to (function action) build/External [RIGHT]
>>
>> Why do string actions not see their env's File() entries rebased to
>> variant dir? Is there some way to do the rebasing manually?
>>
>> If not, how can the function action run commands like the string action
>> would? env.Execute()?
>>
>> Thank you
>> Damjan
>>
>> SConstruct:
>> SConscript('src/SConscript', variant_dir='build', duplicate=0)
>>
>> src/SConscript:
>> import shutil
>> env = DefaultEnvironment()
>> tarball = env.File('52654eb3b2e60c35731ea8fc87f1bd29-jpeg-8d.tar.gz')
>> env['EXTRACT_DIR'] = env.Dir('External')
>> def unpack_tarball(target, source, env):
>>     print("Extracting to (function action) " + str(env['EXTRACT_DIR'])),
>>     shutil.unpack_archive(str(source[0]), str(env['EXTRACT_DIR']))
>> env.Command('${EXTRACT_DIR}/extracted.flg', tarball, [
>>     print("Extracting to (string action) " + str(env['EXTRACT_DIR'])),
>>     unpack_tarball,
>>     Touch('${TARGET}')
>> ])
>>
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