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@@ -11,6 +11,7 @@ import getopt
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 import os
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 import subprocess
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 import sys
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+import tempfile
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 help_message = '''
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 git-chdiff <opts> [file1, file2, ...]
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@@ -88,6 +89,29 @@ def main(argv=None):
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                 continue
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         except OSError, e:
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             print >>sys.stderr, 'Execution failed:', e
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+        # shadow the requested version of the file to a temp file
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+        # so we have something to diff against
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+        try:
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+            p = subprocess.Popen('git show %s:%s' % (revision,nFile), 
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+                                 env=os.environ,
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+                                 shell=True,
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+                                 stdout=subprocess.PIPE, 
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+                                 stderr=subprocess.PIPE)
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+            p.wait()
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+            # git show, it appears, doesn't return a 1 when the
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+            # revision/tag isn't valid so we have to scan the output
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+            lines = p.stdout.readlines()
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+            if lines[0].startswith('fatal:'):
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+                print 'problem getting revision of file %s' % nFile
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+                print line
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+            else:
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+                # save the file out
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+                tFile = tempfile.mkstemp('.temp', 'git-chdiff', '/var/tmp')
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+                if verbose:
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+                    print '\ttemp file: %s' % tFile[1]
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+                os.fdopen(tFile[0], 'w').write(''.join(lines))
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+        except OSError, e:
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+            print >>sys.stderr, 'Execution failed:', e
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 if __name__ == '__main__':
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     sys.exit(main())