1 files changed, 67 insertions, 0 deletions
diff --git a/Tests/RunCMake/ExternalProject/FetchGitTags.cmake b/Tests/RunCMake/ExternalProject/FetchGitTags.cmake
new file mode 100644
index 000000000..37d1b4088
--- /dev/null
+++ b/Tests/RunCMake/ExternalProject/FetchGitTags.cmake
@@ -0,0 +1,67 @@
+find_package(Git QUIET REQUIRED)
+
+include(ExternalProject)
+
+set(srcRepo ${CMAKE_CURRENT_BINARY_DIR}/srcRepo)
+set(srcDir  ${CMAKE_CURRENT_BINARY_DIR}/src)
+set(binDir  ${CMAKE_CURRENT_BINARY_DIR}/build)
+file(MAKE_DIRECTORY ${srcRepo})
+file(MAKE_DIRECTORY ${srcDir})
+
+file(GLOB entries ${srcRepo}/*)
+file(REMOVE_RECURSE ${entries} ${binDir})
+file(TOUCH ${srcRepo}/firstFile.txt)
+configure_file(${CMAKE_CURRENT_LIST_DIR}/FetchGitTags/CMakeLists.txt
+    ${srcDir}/CMakeLists.txt COPYONLY)
+
+function(execGitCommand)
+  execute_process(
+    WORKING_DIRECTORY ${srcRepo}
+    COMMAND ${GIT_EXECUTABLE} ${ARGN}
+    COMMAND_ECHO STDOUT
+    COMMAND_ERROR_IS_FATAL ANY
+  )
+endfunction()
+
+function(configureAndBuild tag)
+  execute_process(COMMAND ${CMAKE_COMMAND}
+      -G ${CMAKE_GENERATOR} -T "${CMAKE_GENERATOR_TOOLSET}"
+      -A "${CMAKE_GENERATOR_PLATFORM}"
+      -D repoDir:PATH=${srcRepo}
+      -D gitTag:STRING=${tag}
+      -B ${binDir}
+      -S ${srcDir}
+    COMMAND_ECHO STDOUT
+    COMMAND_ERROR_IS_FATAL ANY
+  )
+
+  execute_process(COMMAND ${CMAKE_COMMAND} --build ${binDir} --target fetcher
+    WORKING_DIRECTORY ${binDir}
+    COMMAND_ECHO STDOUT
+    COMMAND_ERROR_IS_FATAL ANY
+  )
+endfunction()
+
+# Setup a fresh source repo with a predictable default branch across all
+# git versions
+execGitCommand(-c init.defaultBranch=master init)
+execGitCommand(config --add user.email "testauthor@cmake.org")
+execGitCommand(config --add user.name testauthor)
+
+# Create the initial repo structure
+execGitCommand(add firstFile.txt)
+execGitCommand(commit -m "First file")
+
+message(STATUS "First configure-and-build")
+configureAndBuild(master)
+
+# Create a tagged commit that is not on any branch. With git 2.20 or later,
+# this commit won't be fetched without the --tags option.
+file(TOUCH ${srcRepo}/secondFile.txt)
+execGitCommand(add secondFile.txt)
+execGitCommand(commit -m "Second file")
+execGitCommand(tag -a -m "Adding tag" tag_of_interest)
+execGitCommand(reset --hard HEAD~1)
+
+message(STATUS "Second configure-and-build")
+configureAndBuild(tag_of_interest)