[CMake] Is there a better way to retrieve content from a remote zip file?

[Craig Scott]

You may find the technique described at the following link useful (also
based on ExternalProject, but slightly different take on how it's used):

https://crascit.com/2015/07/25/cmake-gtest/


On Fri, Apr 29, 2016 at 1:58 AM, Chuck Atkins <chuck.atkins at kitware.com>
wrote:

> This looks well suited to ExternalProject.  Just give it an empty
> configure and build steps and then have the install step perform the copy:
>
> include(ExternalProject)
>
> if(CMAKE_SIZEOF_VOID_P EQUAL 8)
>   set(3rdParty_SUBDIR x64)
> else()
>   set(3rdParty_SUBDIR x86)
> endif()
>
> ExternalProject_Add( 3rdParty
>   URL
> http://download.osgvisual.org/3rdParty_VS2013_v120_x86_x64_V9_small.7z
>   URL_MD5 c9294a16b39783cba8c4c55df182b24b
>   BUILD_IN_SOURCE 1
>   CONFIGURE_COMMAND ""
>   BUILD_COMMAND ""
>   INSTALL_COMMAND ${CMAKE_COMMAND} -E copy_directory ${3rdParty_SUBDIR}/
> ${CMAKE_INSTALL_PREFIX}
> )
>
> This created a "3rdParty" target that should do everything you need and
> only if necessary.
>
> - Chuck
>
> On Thu, Apr 28, 2016 at 11:19 AM, Lee Butler <iraytrace at gmail.com> wrote:
>
>> I am looking for a better way to do something than having a sequence of
>> "if (NOT EXISTS)" statements.  My package being built depends on some
>> external libraries and headers, that are available in a zip file on an
>> external website.  So for example:  zlib.h,zlib.dll and zlib.lib are (along
>> with other stuff) in 3rdParty.zip available from a remote URL.  I don't
>> want to build these things, I want to fetch the zip file, unpack it and
>> copy the relevant portions into place only as needed.
>>
>> At the moment I have the code below, which feels "unclean" on so many
>> levels:
>>
>> if (NOT EXISTS "${CMAKE_INSTALL_PREFIX}/include/zlib.h")
>>   if (NOT EXISTS "${CMAKE_CURRENT_BINARY_DIR}/3rdParty_x86_x64")
>>     if (NOT EXISTS
>> "${CMAKE_CURRENT_BINARY_DIR}/3rdParty_VS2013_v120_x86_x64_V9_small.7z")
>>        MESSAGE(STATUS "Downloading 3rdParty")
>>        file(DOWNLOAD
>> http://download.osgvisual.org/3rdParty_VS2013_v120_x86_x64_V9_small.7z
>> "${CMAKE_CURRENT_BINARY_DIR}/3rdParty_VS2013_v120_x86_x64_V9_small.7z"
>> SHOW_PROGRESS)
>>     endif()
>>
>>     message(STATUS "expanding 3rdParty Archive")
>>     execute_process( COMMAND ${CMAKE_COMMAND} -E tar xzf
>> "${CMAKE_CURRENT_BINARY_DIR}/3rdParty_VS2013_v120_x86_x64_V9_small.7z" )
>>   endif()
>>   foreach(dir bin data include lib ssl)
>>     file(RENAME "${CMAKE_CURRENT_BINARY_DIR}/3rdParty_x86_x64/x64/${dir}"
>> "${CMAKE_INSTALL_PREFIX}/${dir}")
>>   endforeach(dir)
>>   file(REMOVE_RECURSE "${CMAKE_CURRENT_BINARY_DIR}/3rdParty_x86_x64")
>> endif()
>>
>> This has the property of fetching the 7z file, extracting the contents
>> and leaving the 7z file around for later rebuilds.  I hope there is a
>> cleaner way of saying the same thing.  BTW, I would be just as happy
>> putting "products" from the zip file in the current build destinations
>> instead of the install destinations.
>> --
>>
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>>
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>
>
> --
>
> Powered by www.kitware.com
>
> Please keep messages on-topic and check the CMake FAQ at:
> http://www.cmake.org/Wiki/CMake_FAQ
>
> Kitware offers various services to support the CMake community. For more
> information on each offering, please visit:
>
> CMake Support: http://cmake.org/cmake/help/support.html
> CMake Consulting: http://cmake.org/cmake/help/consulting.html
> CMake Training Courses: http://cmake.org/cmake/help/training.html
>
> Visit other Kitware open-source projects at
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>
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-- 
Craig Scott
Melbourne, Australia
http://crascit.com
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