1 files changed, 37 insertions, 0 deletions
diff --git a/Modules/ExternalProject-verify.cmake.in b/Modules/ExternalProject-verify.cmake.in
new file mode 100644
index 000000000..c06da4ec8
--- /dev/null
+++ b/Modules/ExternalProject-verify.cmake.in
@@ -0,0 +1,37 @@
+# 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)
+
+if("@LOCAL@" STREQUAL "")
+  message(FATAL_ERROR "LOCAL can't be empty")
+endif()
+
+if(NOT EXISTS "@LOCAL@")
+  message(FATAL_ERROR "File not found: @LOCAL@")
+endif()
+
+if("@ALGO@" STREQUAL "")
+  message(WARNING "File will not be verified since no URL_HASH specified")
+  return()
+endif()
+
+if("@EXPECT_VALUE@" STREQUAL "")
+  message(FATAL_ERROR "EXPECT_VALUE can't be empty")
+endif()
+
+message(STATUS "verifying file...
+     file='@LOCAL@'")
+
+file("@ALGO@" "@LOCAL@" actual_value)
+
+if(NOT "${actual_value}" STREQUAL "@EXPECT_VALUE@")
+  message(FATAL_ERROR "error: @ALGO@ hash of
+  @LOCAL@
+does not match expected value
+  expected: '@EXPECT_VALUE@'
+    actual: '${actual_value}'
+")
+endif()
+
+message(STATUS "verifying file... done")