[Scons-users] Using/keeping previously generated files in a variant_dir (correction)

[Bill Deegan]

Was it  necessary to have your logic make the download dir?
I thought SCons should take care of creating any target dir for a builder
if needed...

-Bill

On Wed, Jan 13, 2016 at 5:18 AM, Pieter van der Meulen <
Pieter.vanderMeulen at surfnet.nl> wrote:

>
> > On 5 Jan 2016, at 01:13, Dirk Bächle <tshortik at gmx.de> wrote:
> >
> > Pieter,
> >
> > On 04.01.2016 21:07, Pieter van der Meulen wrote:
> >> Update because I included a wrong SConstruct file in my first email.
> >>
> >>> On 4 Jan 2016, at 17:08, Pieter van der Meulen <
> Pieter.vanderMeulen at surfnet.nl> wrote:
> >>>
> >>> Hi
> >>>
> >>> I'm using scons to manage a build process which downloads a source
> file during the build. This file is big and changes periodically. I want to
> add a “--no-download" option to the scons build that optionally skips
> downloading this file and uses the previously downloaded version. Without
> using a variant_dir this works as expected for me, when using a variant_dir
> this does not work because at the beginning of the build scons removes the
> downloaded file (/tmp/build/downloadedfile) from the variant_dir.
> >>>
> >>> Is there a way to make scons retain a file in a variant directory? Or
> is there an alternative or better way in scons to achieve this effect?
> >>>
> >
> > please try downloading the file to the source folder directly in the
> top-level SConstruct, such that it's not under the influence of the
> "variant_dir”.
>
> Thanks for the tip, this works well!
>
> Below what I ended up doing using the same example:
>
> ==
> # SConstruct
>
> DefaultEnvironment(tools = []) # Disable default tools
> AllowSubstExceptions() # Report all variable expansion problems
>
> # Setup a build environment and add out own commands (tools) to it
> env = Environment()
>
> root_dir=Dir('#').abspath   # Root directory (i.e. the directory of this
> SConstruct)
> AddOption('--build-dir', dest='build-dir', type='string', nargs=1,
> action='store', metavar='BUILDDIR',
>           help='build directory',
>           default=root_dir )
> build_dir = GetOption('build-dir')   # The directory to build into
>
> AddOption('--no-download', dest='do_download', action='store_false',
> default=True,
>           help='Disable download')
> do_download = GetOption('do_download')
> download_dir=root_dir
> if (build_dir != root_dir):
>     if Execute(Mkdir(build_dir)): # Make sure build dir exists
>         print "Could not create build directory: %s" % build_dir
>         Exit(1)
>     build_dir=Dir(build_dir).abspath
>     download_dir=root_dir+"/download/"+build_dir
>     if Execute(Mkdir(download_dir)): # Make sure downloads dir exists
>         print "Could not create download directory: %s" % download_dir
>         Exit(1)
>
> env['DOWNLOAD_DIR'] = download_dir
> env['DO_DOWNLOAD'] = do_download
>
> print "Building from directory: %s" % root_dir
> print "Using build directory: %s" % build_dir
> print "Using download directory: %s" % download_dir
> print "Download: %s" % do_download
>
> # Include the "SConscript" files that contain the actual build commands
> SConscript( 'SConscript.downloads', exports='env')  # For download files
> into DOWNLOAD_DIR
> if (build_dir != root_dir):
>     env.SConsignFile(build_dir+'/.sconsign.dblite') # Keep scons database
> in the build directory
>     SConscript( 'SConscript', exports='env', variant_dir=build_dir,
> duplicate=1 )
> else:
>     SConscript( 'SConscript', exports='env' )
>
> ==
> # SConscript.downloads
> Import('env')
>
> env.Command( target="${DOWNLOAD_DIR}/downloadedfile", source="",
> action="date > ${TARGET}” )
>
> ==
> # SConscript
>
> Import('env')
>
> env.Command( source="${DOWNLOAD_DIR}/downloadedfile", target="output",
> action="cp ${SOURCE} ${TARGET}” )
> env.AlwaysBuild("output")
>
> > Best regards,
> >
> > Dirk
> >
> >
> > _______________________________________________
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> > Scons-users at scons.org
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>
>
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