Fix mini_installer archive paths with gn

chrome/tools/build/win/create_installer_archive.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Script to create Chrome Installer archive.
 
   This script is used to create an archive of all the files required for a
   Chrome install in appropriate directory structure. It reads chrome.release
   file as input, creates chrome.7z archive, compresses setup.exe and
@@ skipping 231 matching lines @@
       else:
         raise Exception('Did not find an archive input file for "%s"' %
                         staging_file)
 
     # Finally, write the depfile referencing the inputs.
     with open(options.depfile, 'wb') as f:
       f.write(path_fixup(os.path.relpath(archive_file, options.build_dir)) +
               ': \\\n')
       f.write('  ' + ' \\\n  '.join(path_fixup(x) for x in g_archive_inputs))
 
+  # It is important to use abspath to create the path to the directory because
+  # if you use a relative path without any .. sequences then 7za.exe uses the
+  # entire relative path as part of the file paths in the archive. If you have
+  # a .. sequence or an absolute path then only the last directory is stored as
+  # part of the file paths in the archive, which is what we want.
   cmd = [lzma_exec,
          'a',
          '-t7z',
          archive_file,
-         os.path.join(staging_dir, CHROME_DIR),
+         os.path.abspath(os.path.join(staging_dir, CHROME_DIR)),
          '-mx0',]
   # There doesnt seem to be any way in 7za.exe to override existing file so
   # we always delete before creating a new one.
   if not os.path.exists(archive_file):
     RunSystemCommand(cmd, options.verbose)
   elif options.skip_rebuild_archive != "true":
     os.remove(archive_file)
     RunSystemCommand(cmd, options.verbose)
 
   # Do not compress the archive in developer (component) builds.
@@ skipping 328 matching lines @@
   version_assembly_dll_additions = []
   for dll_filename in component_dll_filenames:
     version_assembly_dll_additions.append("  <file name='%s'/>" % dll_filename)
   CopyAndAugmentManifest(build_dir, version_dir,
                          '%s.manifest' % current_version,
                          '\n'.join(version_assembly_dll_additions),
                          '</assembly>')
 
 
 def main(options):
-  """Main method that reads input file, creates archive file and write
+  """Main method that reads input file, creates archive file and writes
   resource input file.
   """
   current_version = BuildVersion(options.build_dir)
 
   config = Readconfig(options.input_file, current_version)
 
   (staging_dir, temp_dir) = MakeStagingDirectories(options.staging_dir)
 
   prev_version = GetPrevVersion(options.build_dir, temp_dir,
                                 options.last_chrome_installer,
@@ skipping 104 matching lines @@
                                               MINI_INSTALLER_INPUT_FILE)
 
   return options
 
 
 if '__main__' == __name__:
   options = _ParseOptions()
   if options.verbose:
     print sys.argv
   sys.exit(main(options))