1 files changed, 187 insertions, 0 deletions
diff --git a/Modules/ExternalProject/download.cmake.in b/Modules/ExternalProject/download.cmake.in
new file mode 100644
index 0000000..6ef4eb1
--- /dev/null
+++ b/Modules/ExternalProject/download.cmake.in
@@ -0,0 +1,187 @@
+# 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)
+
+function(check_file_hash has_hash hash_is_good)
+  if("${has_hash}" STREQUAL "")
+    message(FATAL_ERROR "has_hash Can't be empty")
+  endif()
+
+  if("${hash_is_good}" STREQUAL "")
+    message(FATAL_ERROR "hash_is_good Can't be empty")
+  endif()
+
+  if("@ALGO@" STREQUAL "")
+    # No check
+    set("${has_hash}" FALSE PARENT_SCOPE)
+    set("${hash_is_good}" FALSE PARENT_SCOPE)
+    return()
+  endif()
+
+  set("${has_hash}" TRUE PARENT_SCOPE)
+
+  message(STATUS "verifying file...
+       file='@LOCAL@'")
+
+  file("@ALGO@" "@LOCAL@" actual_value)
+
+  if(NOT "${actual_value}" STREQUAL "@EXPECT_VALUE@")
+    set("${hash_is_good}" FALSE PARENT_SCOPE)
+    message(STATUS "@ALGO@ hash of
+    @LOCAL@
+  does not match expected value
+    expected: '@EXPECT_VALUE@'
+      actual: '${actual_value}'")
+  else()
+    set("${hash_is_good}" TRUE PARENT_SCOPE)
+  endif()
+endfunction()
+
+function(sleep_before_download attempt)
+  if(attempt EQUAL 0)
+    return()
+  endif()
+
+  if(attempt EQUAL 1)
+    message(STATUS "Retrying...")
+    return()
+  endif()
+
+  set(sleep_seconds 0)
+
+  if(attempt EQUAL 2)
+    set(sleep_seconds 5)
+  elseif(attempt EQUAL 3)
+    set(sleep_seconds 5)
+  elseif(attempt EQUAL 4)
+    set(sleep_seconds 15)
+  elseif(attempt EQUAL 5)
+    set(sleep_seconds 60)
+  elseif(attempt EQUAL 6)
+    set(sleep_seconds 90)
+  elseif(attempt EQUAL 7)
+    set(sleep_seconds 300)
+  else()
+    set(sleep_seconds 1200)
+  endif()
+
+  message(STATUS "Retry after ${sleep_seconds} seconds (attempt #${attempt}) ...")
+
+  execute_process(COMMAND "${CMAKE_COMMAND}" -E sleep "${sleep_seconds}")
+endfunction()
+
+if("@LOCAL@" STREQUAL "")
+  message(FATAL_ERROR "LOCAL can't be empty")
+endif()
+
+if("@REMOTE@" STREQUAL "")
+  message(FATAL_ERROR "REMOTE can't be empty")
+endif()
+
+function(download_and_verify)
+  if(EXISTS "@LOCAL@")
+    check_file_hash(has_hash hash_is_good)
+    if(has_hash)
+      if(hash_is_good)
+        message(STATUS
+"File already exists and hash match (skip download):
+  file='@LOCAL@'
+  @ALGO@='@EXPECT_VALUE@'"
+        )
+        return()
+      else()
+        message(STATUS "File already exists but hash mismatch. Removing...")
+        file(REMOVE "@LOCAL@")
+      endif()
+    else()
+      message(STATUS
+"File already exists but no hash specified (use URL_HASH):
+  file='@LOCAL@'
+Old file will be removed and new file downloaded from URL."
+      )
+      file(REMOVE "@LOCAL@")
+    endif()
+  endif()
+
+  set(retry_number 5)
+
+  message(STATUS "Downloading...
+   dst='@LOCAL@'
+   timeout='@TIMEOUT_MSG@'
+   inactivity timeout='@INACTIVITY_TIMEOUT_MSG@'"
+  )
+  set(download_retry_codes 7 6 8 15)
+  set(skip_url_list)
+  set(status_code)
+  foreach(i RANGE ${retry_number})
+    if(status_code IN_LIST download_retry_codes)
+      sleep_before_download(${i})
+    endif()
+    foreach(url @REMOTE@)
+      if(NOT url IN_LIST skip_url_list)
+        message(STATUS "Using src='${url}'")
+
+        @TLS_VERIFY_CODE@
+        @TLS_CAINFO_CODE@
+        @NETRC_CODE@
+        @NETRC_FILE_CODE@
+
+        file(
+          DOWNLOAD
+          "${url}" "@LOCAL@"
+          @SHOW_PROGRESS@
+          @TIMEOUT_ARGS@
+          @INACTIVITY_TIMEOUT_ARGS@
+          STATUS status
+          LOG log
+          @USERPWD_ARGS@
+          @HTTP_HEADERS_ARGS@
+          )
+
+        list(GET status 0 status_code)
+        list(GET status 1 status_string)
+
+        if(status_code EQUAL 0)
+          check_file_hash(has_hash hash_is_good)
+          if(has_hash AND NOT hash_is_good)
+            message(STATUS "Hash mismatch, removing...")
+            file(REMOVE "@LOCAL@")
+          else()
+            message(STATUS "Downloading... done")
+            return()
+          endif()
+        else()
+          string(APPEND logFailedURLs
+"error: downloading '${url}' failed
+        status_code: ${status_code}
+        status_string: ${status_string}
+        log:
+        --- LOG BEGIN ---
+        ${log}
+        --- LOG END ---
+        "
+          )
+        if(NOT status_code IN_LIST download_retry_codes)
+          list(APPEND skip_url_list "${url}")
+          break()
+        endif()
+      endif()
+    endif()
+    endforeach()
+  endforeach()
+
+  message(FATAL_ERROR
+"Each download failed!
+  ${logFailedURLs}
+  "
+  )
+
+endfunction()
+
+download_and_verify()
+
+set(extract_script @extract_script_filename@)
+if(NOT "${extract_script}" STREQUAL "")
+  include(${extract_script})
+endif()