[CMake] CPack per-component value for CPACK_PACKAGING_INSTALL_PREFIX when using RPM generator

[Sam Lunt]

Hi Domen,

Thanks for the reply, but that doesn't seem to work for me. I modified
my example to add this function call:

list(APPEND CPACK_RPM_RELOCATION_PATHS
    ${CPACK_PACKAGING_INSTALL_PREFIX}
)

that silences the warnings, but it still prepends the
CPACK_PACKAGING_INSTALL_PREFIX when generating the RPM files, while I
want it to prepend CPACK_RPM_<COMPONENT>_PACKAGE_PREFIX.

So if I call "rpm -qlp FooBar-0.1.0-Linux-Bar_Comp.rpm", it outputs:
/tmp_dir/foobar
/tmp_dir/foobar/bin
/tmp_dir/foobar/bin/bar

(CPACK_PACKAGING_INSTALL_PREFIX = /tmp_dir/foobar)

I want it to output:

/tmp_dir/bar
/tmp_dir/bar/bin
/tmp_dir/bar/bin/bar

(CPACK_RPM_BAR_COMP_PACKAGE_PREFIX = /tmp_dir/bar)

It seems like cpack is prepending the CPACK_PACKAGING_INSTALL_PREFIX
to any relative paths before actually calling the CPackRPM.cmake
module, so by the time CPackRPM sees the paths, it is seeing
/tmp_dir/foobar/bin/bar and /tmp_dir/foobar/bin/foo, while I want it
to see /tmp_dir/bar/bin/bar and /tmp_dir/foo/bin/foo. Maybe there is
no way to achieve this currently?

Thanks,
Sam

On Thu, Jan 4, 2018 at 1:51 PM, Domen Vrankar <domen.vrankar at gmail.com> wrote:
> 2018-01-03 22:40 GMT+01:00 Sam Lunt <sam.lunt at transmarketgroup.com>:
>>
>> I am trying to set a per-component value for
>> CPACK_PACKAGING_INSTALL_PREFIX when using the RPM generator, but I
>> haven't been able to do so.
>>
>> I would like to be able to:
>> 1. Install using "make install" (or cmake --build ${BUILD_DIR}
>> --target install) and have CMAKE_INSTALL_PREFIX control the install
>> location
>> 2. Generate an rpm file for each component such that the rpm is
>> relocatable (i.e. --prefix and --relocate are supported) and each
>> component has a different default installation location
>>
>> The documentation for CPACK_RPM_<COMPONENT>_PACKAGE_PREFIX seems to
>> indicate that it is the correct way to set a per-component install
>> prefix, since it says that CPACK_RPM_<COMPONENT>_PACKAGE_PREFIX "May
>> be used to set per component CPACK_PACKAGING_INSTALL_PREFIX for
>> relocatable RPM packages." However, I am only able to successfully use
>> this if I provide an absolute path to the install command, but that
>> inhibits the use of CMAKE_INSTALL_PREFIX.
>
>
> How about using CPACK_RPM_RELOCATION_PATHS?
> https://cmake.org/cmake/help/v3.10/module/CPackRPM.html#variable:CPACK_RPM_RELOCATION_PATHS
>
> install(DIRECTORY DESTINATION ${CMAKE_INSTALL_LIBDIR}/some_dir COMPONENT
> libraries)
> set(CPACK_RPM_RELOCATION_PATHS "${CMAKE_INSTALL_INCLUDEDIR}"
>   "${CMAKE_INSTALL_LIBDIR}")
>
> You specify all the relocation paths for all components and if one or more
> of them are found during package generation that path is written to the
> package as a relocation path.
> You can also use
> https://cmake.org/cmake/help/v3.10/module/CPackRPM.html#variable:CPACK_RPM_NO_INSTALL_PREFIX_RELOCATION
> to discard CPACK_PACKAGING_INSTALL_PREFIX as a relocation path.
>
> This feature can also (is prefered to) be used in combination with
> GNUInstallDirs module
> (https://cmake.org/cmake/help/v3.10/module/GNUInstallDirs.html?highlight=gnuinstalldirs):
>
> include(GNUInstallDirs)
>
> Regards,
> Domen