From 50a022d81bee885bb7181bc96e74236ae0604bc9 Mon Sep 17 00:00:00 2001
From: lethosor <lethosor@gmail.com>
Date: Sat, 18 Mar 2017 00:31:15 -0400
Subject: [PATCH] download_file(): avoid copying files if the correct file
 already exists

---
 CMake/DownloadFile.cmake | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/CMake/DownloadFile.cmake b/CMake/DownloadFile.cmake
index fe9e4e05e..5a10cca2f 100644
--- a/CMake/DownloadFile.cmake
+++ b/CMake/DownloadFile.cmake
@@ -25,16 +25,16 @@ function(download_file URL DEST EXPECTED_MD5)
   get_filename_component(FILENAME "${URL}" NAME)
   file_md5_if_exists("${DEST}" CUR_MD5)
 
-  search_downloads(${EXPECTED_MD5} DLPATH)
-  if(NOT("${DLPATH}" STREQUAL ""))
-    message("* Copying ${FILENAME} from ${DLPATH}")
-    execute_process(COMMAND "${CMAKE_COMMAND}" -E copy
-      "${DLPATH}"
-      "${DEST}")
-    return()
-  endif()
-
   if(NOT "${EXPECTED_MD5}" STREQUAL "${CUR_MD5}")
+    search_downloads(${EXPECTED_MD5} DLPATH)
+    if(NOT("${DLPATH}" STREQUAL ""))
+      message("* Copying ${FILENAME} from ${DLPATH}")
+      execute_process(COMMAND "${CMAKE_COMMAND}" -E copy
+        "${DLPATH}"
+        "${DEST}")
+      return()
+    endif()
+
     message("* Downloading ${FILENAME}")
     file(DOWNLOAD "${URL}" "${DEST}" EXPECTED_MD5 "${EXPECTED_MD5}" SHOW_PROGRESS)
   endif()