From f5e8ce522e5b37f29d5ef89aa79e1b82e192466f Mon Sep 17 00:00:00 2001
From: David Cole <david.cole@kitware.com>
Date: Wed, 26 May 2010 17:42:56 -0400
Subject: Use RENAME, not COPY, to extract .tar.gz files.

  Use ABSOLUTE file name for the RENAME operation.
  (Thanks to Marcus for figuring out that it doesn't
   work on Linux without the ABSOLUTE bit.)
---
 Modules/ExternalProject.cmake | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/Modules/ExternalProject.cmake b/Modules/ExternalProject.cmake
index 0302d5c..7f29147 100644
--- a/Modules/ExternalProject.cmake
+++ b/Modules/ExternalProject.cmake
@@ -243,7 +243,7 @@ message(STATUS \"downloading... done\")
 endfunction(_ep_write_downloadfile_script)
 
 
-function(_ep_write_extractfile_script script_filename filename tmp directory)
+function(_ep_write_extractfile_script script_filename filename directory)
   set(args "")
 
   if(filename MATCHES ".tar$")
@@ -267,7 +267,6 @@ function(_ep_write_extractfile_script script_filename filename tmp directory)
 "# Make file names absolute:
 #
 get_filename_component(filename \"${filename}\" ABSOLUTE)
-get_filename_component(tmp \"${tmp}\" ABSOLUTE)
 get_filename_component(directory \"${directory}\" ABSOLUTE)
 
 message(STATUS \"extracting...
@@ -276,11 +275,11 @@ message(STATUS \"extracting...
 
 # Prepare a space for extracting:
 #
-set(i 1)
-while(EXISTS \"\${tmp}/extract\${i}\")
+set(i 1234)
+while(EXISTS \"\${directory}/../ex\${i}\")
   math(EXPR i \"\${i} + 1\")
 endwhile()
-set(ut_dir \"\${tmp}/extract\${i}\")
+set(ut_dir \"\${directory}/../ex\${i}\")
 file(MAKE_DIRECTORY \"\${ut_dir}\")
 
 # Extract it:
@@ -305,10 +304,12 @@ if(NOT n EQUAL 1 OR NOT IS_DIRECTORY \"\${contents}\")
   set(contents \"\${ut_dir}\")
 endif()
 
-# Copy \"the one\" directory to the final directory:
+# Move \"the one\" directory to the final directory:
 #
-message(STATUS \"extracting... [copy]\")
-file(COPY \"\${contents}/\" DESTINATION \${directory})
+message(STATUS \"extracting... [rename]\")
+file(REMOVE_RECURSE \${directory})
+get_filename_component(contents \${contents} ABSOLUTE)
+file(RENAME \${contents} \${directory})
 
 # Clean up:
 #
@@ -710,7 +711,7 @@ function(_ep_add_download_command name)
         set(comment "Performing download step (extract) for '${name}'")
       endif()
       # TODO: Support other archive formats.
-      _ep_write_extractfile_script("${stamp_dir}/extract-${name}.cmake" "${file}" "${tmp_dir}" "${source_dir}")
+      _ep_write_extractfile_script("${stamp_dir}/extract-${name}.cmake" "${file}" "${source_dir}")
       list(APPEND cmd ${CMAKE_COMMAND} -P ${stamp_dir}/extract-${name}.cmake)
     endif()
   else()
-- 
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