ExternalProject: Add unit tests for UPDATE_DISCONNECTED

Tests/ExternalProjectUpdate/CMakeLists.txt

@@ -72,6 +72,18 @@ if(do_git_tests)
   )
   ExternalProject_Add_StepDependencies(${proj} download SetupLocalGITRepository)
   set_property(TARGET ${proj} PROPERTY FOLDER "GIT")
+
+  set(proj TutorialStep2-GIT)
+  ExternalProject_Add(${proj}
+    GIT_REPOSITORY "${local_git_repo}"
+    GIT_TAG ${TEST_GIT_TAG}
+    CMAKE_GENERATOR "${CMAKE_GENERATOR}"
+    CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>
+    INSTALL_COMMAND ""
+    UPDATE_DISCONNECTED 1
+  )
+  ExternalProject_Add_StepDependencies(${proj} download SetupLocalGITRepository)
+  set_property(TARGET ${proj} PROPERTY FOLDER "GIT")
 endif()
 
 

Tests/ExternalProjectUpdate/ExternalProjectUpdateTest.cmake

@@ -59,6 +59,102 @@ was expected."
   if( EXISTS ${FETCH_HEAD_file} AND NOT ${fetch_expected})
     message( FATAL_ERROR "Fetch DID occur when it was not expected.")
   endif()
+
+  message( STATUS "Checking ExternalProjectUpdate to tag: ${desired_tag} (disconnected)" )
+
+  # Remove the FETCH_HEAD file, so we can check if it gets replaced with a 'git
+  # fetch'.
+  set( FETCH_HEAD_file ${ExternalProjectUpdate_BINARY_DIR}/CMakeExternals/Source/TutorialStep2-GIT/.git/FETCH_HEAD )
+  file( REMOVE ${FETCH_HEAD_file} )
+
+  # Check initial SHA
+  execute_process(COMMAND ${GIT_EXECUTABLE}
+    rev-list --max-count=1 HEAD
+    WORKING_DIRECTORY ${ExternalProjectUpdate_BINARY_DIR}/CMakeExternals/Source/TutorialStep2-GIT
+    RESULT_VARIABLE error_code
+    OUTPUT_VARIABLE initial_sha
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+    )
+
+  # Configure
+  execute_process(COMMAND ${CMAKE_COMMAND}
+    -G ${CMAKE_GENERATOR} -T "${CMAKE_GENERATOR_TOOLSET}"
+    -A "${CMAKE_GENERATOR_PLATFORM}"
+    -DTEST_GIT_TAG:STRING=${desired_tag}
+    ${ExternalProjectUpdate_SOURCE_DIR}
+    WORKING_DIRECTORY ${ExternalProjectUpdate_BINARY_DIR}
+    RESULT_VARIABLE error_code
+    )
+  if(error_code)
+    message(FATAL_ERROR "Could not configure the project.")
+  endif()
+
+  # Build
+  execute_process(COMMAND ${CMAKE_COMMAND}
+    --build ${ExternalProjectUpdate_BINARY_DIR}
+    RESULT_VARIABLE error_code
+    )
+  if(error_code)
+    message(FATAL_ERROR "Could not build the project.")
+  endif()
+
+  if( EXISTS ${FETCH_HEAD_file} )
+    message( FATAL_ERROR "Fetch occured when it was not expected.")
+  endif()
+
+  # Check the resulting SHA
+  execute_process(COMMAND ${GIT_EXECUTABLE}
+    rev-list --max-count=1 HEAD
+    WORKING_DIRECTORY ${ExternalProjectUpdate_BINARY_DIR}/CMakeExternals/Source/TutorialStep2-GIT
+    RESULT_VARIABLE error_code
+    OUTPUT_VARIABLE tag_sha
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+    )
+  if(error_code)
+    message(FATAL_ERROR "Could not check the sha.")
+  endif()
+
+  if(NOT (${tag_sha} STREQUAL ${initial_sha}))
+    message(FATAL_ERROR "Update occurred when it was not expected.")
+  endif()
+
+  # Update
+  execute_process(COMMAND ${CMAKE_COMMAND}
+    --build ${ExternalProjectUpdate_BINARY_DIR}
+    --target TutorialStep2-GIT-update
+    RESULT_VARIABLE error_code
+    )
+  if(error_code)
+    message(FATAL_ERROR "Could not build the project.")
+  endif()
+
+  # Check the resulting SHA
+  execute_process(COMMAND ${GIT_EXECUTABLE}
+    rev-list --max-count=1 HEAD
+    WORKING_DIRECTORY ${ExternalProjectUpdate_BINARY_DIR}/CMakeExternals/Source/TutorialStep2-GIT
+    RESULT_VARIABLE error_code
+    OUTPUT_VARIABLE tag_sha
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+    )
+  if(error_code)
+    message(FATAL_ERROR "Could not check the sha.")
+  endif()
+
+  if(NOT (${tag_sha} STREQUAL ${resulting_sha}))
+    message(FATAL_ERROR "UPDATE_COMMAND produced
+  ${tag_sha}
+when
+  ${resulting_sha}
+was expected."
+    )
+  endif()
+
+  if( NOT EXISTS ${FETCH_HEAD_file} AND ${fetch_expected})
+    message( FATAL_ERROR "Fetch did NOT occur when it was expected.")
+  endif()
+  if( EXISTS ${FETCH_HEAD_file} AND NOT ${fetch_expected})
+    message( FATAL_ERROR "Fetch DID occur when it was not expected.")
+  endif()
 endmacro()
 
 find_package(Git)