Revision 5a7cb9d3 lib/backend.py

b/lib/backend.py
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  if constants.OS_VARIANTS_FILE in os_files:
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    variants_file = os_files[constants.OS_VARIANTS_FILE]
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    try:
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      variants = utils.ReadFile(variants_file).splitlines()
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      variants = \
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        utils.FilterEmptyLinesAndComments(utils.ReadFile(variants_file))
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    except EnvironmentError, err:
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      # we accept missing files, but not other errors
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      if err.errno != errno.ENOENT:

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