[ntuple] DAOS support: added libdaos_mock (for use in tests)

libdaos_mock provides an implementation for a small subset of libdaos that
enables in-memory storage. This is especially interesting for testing
environments that do not have access to a DAOS deployment.

Author: jalopezg-git

cmake/modules/SearchInstalledSoftware.cmake

@@ -1193,15 +1193,30 @@ if (uring)
 endif()
 
 #---Check for DAOS----------------------------------------------------------------
+if (daos AND daos_mock)
+  message(FATAL_ERROR "Options `daos` and `daos_mock` are mutually exclusive; only one of them should be specified.")
+endif()
+
+if (daos OR daos_mock)
+  message(STATUS "Looking for libuuid")
+  if(fail-on-missing)
+    find_package(libuuid REQUIRED)
+  else()
+    find_package(libuuid)
+    if(NOT libuuid_FOUND)
+      message(STATUS "libuuid not found. Disabling DAOS support")
+      set(daos OFF CACHE BOOL "Disabled (libuuid not found)" FORCE)
+      set(daos_mock OFF CACHE BOOL "Disabled (libuuid not found)" FORCE)
+    endif()
+  endif()
+endif()
 if (daos)
   message(STATUS "Looking for DAOS")
   if(fail-on-missing)
     find_package(DAOS REQUIRED)
-    find_package(libuuid REQUIRED)
   else()
     find_package(DAOS)
-    find_package(libuuid)
-    if(NOT DAOS_FOUND OR NOT libuuid_FOUND)
+    if(NOT DAOS_FOUND)
       message(STATUS "libdaos not found. Disabling DAOS support")
       set(daos OFF CACHE BOOL "Disabled (libdaos not found)" FORCE)
     endif()

tree/ntuple/CMakeLists.txt

@@ -72,15 +72,21 @@ DEPENDENCIES
   ROOTVecOps
 )
 
-if(daos)
+# Enable RNTuple support for Intel DAOS
+if(daos OR daos_mock)
   set(ROOTNTuple_EXTRA_HEADERS ROOT/RPageStorageDaos.hxx)
   target_sources(ROOTNTuple PRIVATE v7/src/RDaos.cxx v7/src/RPageStorageDaos.cxx)
-
-  set_property(SOURCE v7/src/RDaos.cxx v7/src/RPageStorageDaos.cxx
-  	      APPEND PROPERTY COMPILE_OPTIONS -I${DAOS_INCLUDE_DIRS} -I${UUID_INCLUDE_DIR})
-  target_link_libraries(ROOTNTuple PRIVATE ${DAOS_LIBRARIES} ${UUID_LIBRARY})
-
   target_compile_definitions(ROOTNTuple PRIVATE R__ENABLE_DAOS)
+
+  target_include_directories(ROOTNTuple PRIVATE ${UUID_INCLUDE_DIR})
+  target_link_libraries(ROOTNTuple PRIVATE ${UUID_LIBRARY})
+  if(daos_mock)
+    target_include_directories(ROOTNTuple PRIVATE v7/inc/ROOT/libdaos_mock/)
+    target_sources(ROOTNTuple PRIVATE v7/src/libdaos_mock/libdaos_mock.cxx)
+  else()
+    target_include_directories(ROOTNTuple PRIVATE ${DAOS_INCLUDE_DIRS})
+    target_link_libraries(ROOTNTuple PRIVATE ${DAOS_LIBRARIES})
+  endif()
 endif()
 
 if(MSVC)