1 files changed, 92 insertions, 0 deletions
diff --git a/Modules/ExternalProject/gitclone.cmake.in b/Modules/ExternalProject/gitclone.cmake.in
new file mode 100644
index 0000000000..a2e900c112
--- /dev/null
+++ b/Modules/ExternalProject/gitclone.cmake.in
@@ -0,0 +1,92 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+cmake_minimum_required(VERSION 3.5)
+
+set(quiet "@quiet@")
+set(script_dir "@CMAKE_CURRENT_FUNCTION_LIST_DIR@/ExternalProject")
+include(${script_dir}/captured_process_setup.cmake)
+
+if(NOT "@gitclone_infofile@" IS_NEWER_THAN "@gitclone_stampfile@")
+  if(NOT quiet)
+    message(STATUS
+      "Avoiding repeated git clone, stamp file is up to date: "
+      "'@gitclone_stampfile@'"
+    )
+  endif()
+  return()
+endif()
+
+execute_process(
+  COMMAND ${CMAKE_COMMAND} -E rm -rf "@source_dir@"
+  RESULT_VARIABLE error_code
+  ${capture_output}
+)
+_ep_command_check_result(
+  error_code "Failed to remove directory: '@source_dir@'"
+)
+
+# try the clone 3 times in case there is an odd git clone issue
+set(error_code 1)
+set(number_of_tries 0)
+while(error_code AND number_of_tries LESS 3)
+  # If you are seeing the following call hang and you have QUIET enabled, try
+  # turning QUIET off to show any output immediately. The command may be
+  # blocking while waiting for user input (e.g. a password to a SSH key).
+  execute_process(
+    COMMAND "@git_EXECUTABLE@" @git_options@
+            clone @git_clone_options@ "@git_repository@" "@src_name@"
+    WORKING_DIRECTORY "@work_dir@"
+    RESULT_VARIABLE error_code
+    ${capture_output}
+  )
+  if(NOT "${out_var}" STREQUAL "")
+    string(APPEND accumulated_output "${out_var}\n")
+  endif()
+  math(EXPR number_of_tries "${number_of_tries} + 1")
+endwhile()
+if(number_of_tries GREATER 1)
+  set(msg "Had to git clone more than once: ${number_of_tries} times.")
+  if(quiet)
+    string(APPEND accumulated_output "${msg}\n")
+  else()
+    message(STATUS "${msg}")
+  endif()
+endif()
+_ep_command_check_result(
+  error_code "Failed to clone repository: '@git_repository@'"
+)
+
+execute_process(
+  COMMAND "@git_EXECUTABLE@" @git_options@
+          checkout "@git_tag@" @git_checkout_explicit--@
+  WORKING_DIRECTORY "@work_dir@/@src_name@"
+  RESULT_VARIABLE error_code
+  ${capture_output}
+)
+_ep_command_check_result(error_code "Failed to checkout tag: '@git_tag@'")
+
+set(init_submodules @init_submodules@)
+if(init_submodules)
+  execute_process(
+    COMMAND "@git_EXECUTABLE@" @git_options@
+            submodule update @git_submodules_recurse@ --init @git_submodules@
+    WORKING_DIRECTORY "@work_dir@/@src_name@"
+    RESULT_VARIABLE error_code
+    ${capture_output}
+  )
+  _ep_command_check_result(
+    error_code "Failed to update submodules in: '@work_dir@/@src_name@'"
+  )
+endif()
+
+# Complete success, update the script-last-run stamp file:
+#
+execute_process(
+  COMMAND ${CMAKE_COMMAND} -E copy "@gitclone_infofile@" "@gitclone_stampfile@"
+  RESULT_VARIABLE error_code
+  ${capture_output}
+)
+_ep_command_check_result(
+  error_code "Failed to copy script-last-run stamp file: '@gitclone_stampfile@'"
+)