build: add ability to disable some plugins from packaging and tests

When custom-packaging the VPP artifacts, it can be useful to exclude
some of the core plugins from packaging/testing, for some reasons.
A removal of a plugin(s) from the worktree needs to be tracked as
a separate change, and thus is tricky from the maintenance
point of view.

This change adds the ability to "pretend they do not exist" -
plugins which are added to the comma-separated environment
variable "VPP_EXCLUDED_PLUGINS" will not be added to the build
process and not packaged.

The tests do not have the 1:1 relationship as plugins,
so they might need to be modified separately. This change
includes some of these modifications as an example.

Type: feature
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>
Change-Id: Id31562d00a01ced1acbb4996a633517cbd6f09d8

1 files changed, 21 insertions, 1 deletions

diff --git a/src/plugins/CMakeLists.txt b/src/plugins/CMakeLists.txt
index e54eaa2c4cb..43ad4cc2a25 100644
--- a/src/plugins/CMakeLists.txt
+++ b/src/plugins/CMakeLists.txt
@@ -23,7 +23,27 @@ FILE(GLOB files RELATIVE
   ${CMAKE_CURRENT_SOURCE_DIR}
   ${CMAKE_CURRENT_SOURCE_DIR}/*/CMakeLists.txt
 )
+
+set(VPP_EXCLUDED_PLUGINS
+  ""
+  CACHE
+  STRING "Comma-separated list of core plugins excluded from packaging and tests"
+)
+
+# create the list of the plugins that we need to exclude from packaging
+SET(excluded_plugins "")
+STRING(REGEX REPLACE "[,]+" ";" exc_plugins "${VPP_EXCLUDED_PLUGINS}")
+foreach (e ${exc_plugins})
+  message(WARNING "Excluding plugin due to VPP_EXCLUDED_PLUGINS: '${e}'")
+  list(APPEND excluded_plugins ${e})
+endforeach()
+
 foreach (f ${files})
   get_filename_component(dir ${f} DIRECTORY)
-  add_subdirectory(${dir})
+
+  # if a plugin is in the list of excluded plugin, do not add that subdirectory
+  LIST(FIND excluded_plugins "${dir}" exc_index)
+  if(${exc_index} EQUAL "-1")
+    add_subdirectory(${dir})
+  endif()
 endforeach()