Support external startup data in V8.

tools/concatenate-files.py

 #!/usr/bin/env python
+#
 # Copyright 2014 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
 #       with the distribution.
 #     * Neither the name of Google Inc. nor the names of its
 #       contributors may be used to endorse or promote products derived
 #       from this software without specific prior written permission.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-# Wraps test execution with a coverage analysis. To get the best speed, the
-# native python coverage version >= 3.7.1 should be installed.
+# This utility concatenates several files into one. On Unix-like systems
+# it is equivalent to:
+#   cat file1 file2 file3 ...files... > target
+#
+# The reason for writing a seperate utility is that 'cat' is not available
+# on all supported build platforms, but Python is, and hence this provides
+# us with an easy and uniform way of doing this on all platforms.
 
-import coverage
-import os
-import unittest
-import sys
+import optparse
 
 
-def Main(argv):
-  script_path = os.path.dirname(os.path.abspath(__file__))
-  cov = coverage.coverage(include=([os.path.join(script_path, '*.py')]))
-  cov.start()
-  import test_scripts
-  alltests = map(unittest.TestLoader().loadTestsFromTestCase, [
-    test_scripts.ToplevelTest,
-    test_scripts.ScriptTest,
-    test_scripts.SystemTest,
-  ])
-  unittest.TextTestRunner(verbosity=2).run(unittest.TestSuite(alltests))
-  cov.stop()
-  print cov.report()
+def Concatenate(filenames):
+  """Concatenate files.
+
+  Args:
+    files: Array of file names.
+           The last name is the target; all earlier ones are sources.
+
+  Returns:
+    True, if the operation was successful.
+  """
+  if len(filenames) < 2:
+    print "An error occured generating %s:\nNothing to do." % filenames[-1]
+    return False
+
+  try:
+    with open(filenames[-1], "wb") as target:
+      for filename in filenames[:-1]:
+        with open(filename, "rb") as current:
+          target.write(current.read())
+    return True
+  except IOError as e:
+    print "An error occured when writing %s:\n%s" % (filenames[-1], e)
+    return False
 
 
-if __name__ == '__main__':
-  sys.exit(Main(sys.argv))
+def main():
+  parser = optparse.OptionParser()
+  parser.set_usage("""Concatenate several files into one.
+      Equivalent to: cat file1 ... > target.""")
+  (options, args) = parser.parse_args()
+  exit(0 if Concatenate(args) else 1)
+
+
+if __name__ == "__main__":
+  main()