On Sun, 18 Feb 2018, David Adam wrote:
> Our project installs an empty directory for other programs to drop files
> in, the location of which is overrideable with a cache variable. Some
> environments set the location of this directory outside the writeable
> area and create it themselves, so I'd like to set up CMake so that it
> tries to create the directory but skips over it if there is a failure.
>
> At the moment we use:
>
> SET(extra_completionsdir
> ${rel_datadir}/fish/vendor_completions.d
> CACHE STRING "Path for extra completions")
> INSTALL(DIRECTORY DESTINATION ${extra_completionsdir})
>
> but that fails if the destination is not writeable.
>
> Is there an idiomatic way of ignoring a failed installation step? At the
> moment, I'm trying various install(script code execute_process(...
> incantations, but I'm aware there's lots of corner cases with DESTDIR and
> so on.
For the record, I ended up implementing just enough to make our use case
work:
FUNCTION(FISH_TRY_CREATE_DIRS)
FOREACH(dir ${ARGV})
IF(NOT IS_ABSOLUTE ${dir})
SET(abs_dir "\$ENV{DESTDIR}\${CMAKE_INSTALL_PREFIX}/${dir}")
ELSE()
SET(abs_dir "\$ENV{DESTDIR}${dir}")
ENDIF()
INSTALL(SCRIPT CODE "EXECUTE_PROCESS(COMMAND mkdir -p ${abs_dir}
OUTPUT_QUIET ERROR_QUIET)
EXECUTE_PROCESS(COMMAND chmod 755 ${abs_dir}
OUTPUT_QUIET ERROR_QUIET)
")
ENDFOREACH()
ENDFUNCTION(FISH_TRY_CREATE_DIRS)
Perhaps that will help someone in a similar situation in the future.
David Adam
[email protected]
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