[CMake] Packaging a directory with CPack RPM

[Eric Noulard]

Le jeu. 12 sept. 2019 à 02:27, Ashish Sadanandan <
ashish.sadanandan at gmail.com> a écrit :

> Hello,
> I'm using CPack to create RPMs for an application. I have this working but
> the CPack step is quite slow. While investigating this, I noticed that all
> files in a directory I'm packaging, which contains a large number of small
> files, is being listed in the spec file.
>
> For instance, say I have
>
>     set(CPACK_PACKAGING_INSTALL_PREFIX /opt/myapp)
>     install(DIRECTORY ${CMAKE_BINARY_DIR}/myapp/foo
>             DESTINATION foo
>             COMPONENT myapp
>     )
>
> In the %files section I see
>
>     %files
>     %dir /opt/myapp/foo
>     " /opt/myapp/foo/file1"
>     " /opt/myapp/foo/file2"
>     ...
>     " /opt/myapp/foo/file60000"
>
> If I were writing the spec file by hand, this entire section could be
> replaced by a single line
>
>     %files
>     /opt/myapp/foo
>

CPack has no idea that the list of files are coming from an installed
*directory*, because CPack is not doing the install CMake is.
Thus CPackRPM and other CPack generators collect all installed bits inside
a given [temporary] prefix directory.

Now may be you can tell CPack to ignore some of you installed
files/directory by using: CPACK_RPM_USER_FILELIST

https://cmake.org/cmake/help/v3.15/cpack_gen/rpm.html#cpack_gen:CPack%20RPM%20Generator



> RPM will package all files within the directory if you specify the
> directory under %files (
> http://ftp.rpm.org/max-rpm/s1-rpm-inside-files-list-directives.html - the
> "The %dir Directive" section)
> Is there an option to list just the directory instead of recursively
> listing all contained files within the directory?
>

AFAIK, No there is not.


I'm not claiming this is the reason for CPack being slow, I came across
> this while investigating performance and if nothing else, this will result
> in a cleaner looking spec file.
>

For performance sake you can
try CPACK_RPM_USER_BINARY_SPECFILE,
CPACK_RPM_GENERATE_USER_BINARY_SPECFILE_TEMPLATE
and handcraft your "user" spec file in order to see if it helps the
packaging performance.
and/or you can set CPACK_RPM_PACKAGE_DEBUG to 1 in order to get more timed
traces of CPackRPM execution.


-- 
Eric
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