CMake: restore INSTALL_CONFIG

CHANGES-3.3

@@ -36,6 +36,11 @@ This release contains contributions from (alphabetically by first name):
    enabled, even the ones with no translations at all.
  - The logging format in the `session.log` file and on-screen is now
    more similar, although the file contains a lot more per-line information.
+ - The INSTALL_CONFIG option has been restored. It is still a terrible
+   idea to fork the repository to modify the config files, and you
+   probably should have a calamares-config package with those files
+   instead, there are packaging workflows that can usefully patch-and-
+   install configuration files. The option defaults to OFF.
 
 ## Modules ##
  - All QML modules now have a Qt6-compatible set of QML files as well. (thanks Anke)

CMakeLists.txt

@@ -79,6 +79,7 @@ set(CALAMARES_SOVERSION "${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}")
 #
 option(INSTALL_POLKIT "Install Polkit configuration" ON)
 option(INSTALL_COMPLETION "Install shell completions" OFF)
+option(INSTALL_CONFIG "Install configuration files" OFF)
 # When adding WITH_* that affects the ABI offered by libcalamares,
 # also update libcalamares/CalamaresConfig.h.in
 option(WITH_PYBIND11 "Use bundled pybind11 instead o Boost::Python" ON)
@@ -682,6 +683,10 @@ install(FILES calamares.desktop DESTINATION ${CMAKE_INSTALL_DATADIR}/application
 
 install(FILES man/calamares.8 DESTINATION ${CMAKE_INSTALL_MANDIR}/man8/)
 
+if(INSTALL_CONFIG)
+    install(FILES settings.conf DESTINATION share/calamares)
+endif()
+
 ### Uninstall
 #
 #

CMakeModules/CalamaresAddModuleSubdirectory.cmake

@@ -167,7 +167,14 @@ function( _calamares_add_module_subdirectory_impl )
             message( "   ${Green}TYPE:${ColorReset} jobmodule" )
             message( "   ${Green}MODULE_DESTINATION:${ColorReset} ${MODULE_DESTINATION}" )
             if( MODULE_CONFIG_FILES )
-                message( "   ${Green}CONFIGURATION_FILES:${ColorReset} ${MODULE_CONFIG_FILES} => [Build directory only]" )
+                if (INSTALL_CONFIG)
+                    message("   ${Green}CONFIGURATION_FILES:${ColorReset} ${MODULE_CONFIG_FILES} => [Build directory and ${MODULE_DATA_DESTINATION}]")
+                    foreach(_cf ${MODULE_CONFIG_FILES})
+                        install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${SUBDIRECTORY}/${_cf} DESTINATION ${MODULE_DESTINATION})
+                    endforeach()
+                else()
+                    message("   ${Green}CONFIGURATION_FILES:${ColorReset} ${MODULE_CONFIG_FILES} => [Build directory only]")
+                endif()
             endif()
             message( "" )
             # We copy over the lang directory, if any

CMakeModules/CalamaresAddPlugin.cmake

@@ -104,7 +104,9 @@ function( calamares_add_plugin )
             message( FATAL_ERROR "${Red}NO_CONFIG${ColorReset} is set, with configuration ${Red}${PLUGIN_CONFIG_FILES}${ColorReset}" )
         endif()
         set( _destination "(unknown)" )
-        if( NOT PLUGIN_NO_INSTALL )
+        if(INSTALL_CONFIG AND NOT PLUGIN_NO_INSTALL)
+            set(_destination "${PLUGIN_DATA_DESTINATION}")
+        elseif( NOT PLUGIN_NO_INSTALL )
             set( _destination "[Build directory only]" )
         else()
             set( _destination "[Skipping installation]" )
@@ -213,6 +215,9 @@ function( calamares_add_plugin )
                 message( "   ${BoldYellow}Not updating${ColorReset} ${PLUGIN_CONFIG_FILE}" )
                 set( _warned_config ON )
             endif()
+            if(INSTALL_CONFIG)
+                install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PLUGIN_CONFIG_FILE} DESTINATION ${PLUGIN_DATA_DESTINATION})
+            endif()
         endforeach()
         if ( _warned_config )
             message( "" )