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/usr/bin/suspicious-source is in devscripts 2.11.6ubuntu1.

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#!/usr/bin/python

# Copyright (c) 2010-2011, Benjamin Drung <bdrung@debian.org>
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

import optparse
import os
import sys

from devscripts.logger import Logger

try:
    import magic
except ImportError:
    Logger.error("Please install 'python-magic' in order to use this utility.")
    sys.exit(1)

DEFAULT_WHITELISTED_MIMETYPES = [
    "application/vnd.font-fontforge-sfd", # font source: fontforge
    "application/x-elc",
    "application/x-empty",
    "application/x-font-otf",             # font object and source
    "application/x-font-ttf",             # font object and source
    "application/x-font-woff",            # font object and source
    "application/x-symlink",
    "application/xml",
    "audio/x-wav",
    "font/otf",                           # font object and source
    "font/ttf",                           # font object and source
    "image/gif",
    "image/jpeg",
    "image/png",
    "image/svg+xml",
    "image/vnd.adobe.photoshop",
    "image/x-icns",
    "image/x-ico",
    "image/x-ms-bmp",
    "image/x-portable-pixmap",
    "inode/x-empty",
    "message/rfc822",
    "text/html",
    "text/plain",
    "text/rtf",
    "text/troff",
    "text/x-asm",
    "text/x-c",
    "text/x-c++",
    "text/x-diff",
    "text/x-fortran",
    "text/x-java",
    "text/x-lisp",
    "text/x-m4",
    "text/x-makefile",
    "text/x-msdos-batch",
    "text/x-pascal",
    "text/x-perl",
    "text/x-php",
    "text/x-po",
    "text/x-python",
    "text/x-shellscript",
    "text/x-tex",
    "text/x-texinfo",
]

DEFAULT_WHITELISTED_EXTENSIONS = [
    ".fea",   # font source format: Adobe Font Development Kit for OpenType
    ".fog",   # font source format: Fontographer
    ".g2n",   # font source format: fontforge
    ".gdh",   # font source format: Graphite (headers)
    ".gdl",   # font source format: Graphite
    ".glyph", # font source format: cross-toolkit UFO
    ".icns",  # Apple Icon Image format
    ".java",  # Java source files
    ".plate", # font source format: Spiro
    ".rsa",
    ".sfd",   # font source format: fontforge
    ".sfdir", # font source format: fontforge
    ".ttx",   # font source format: fonttools
    ".ufo",   # font source format: cross-toolkit UFO
    ".vfb"    # font source format: FontLab
    ".vtp",   # font source format: OpenType (VOLT)
    ".xgf",   # font source format: Xgridfit
]

def suspicious_source(whitelisted_mimetypes, whitelisted_extensions, directory,
                      verbose=False):
    magic_cookie = magic.open(magic.MAGIC_MIME_TYPE)
    magic_cookie.load()

    for root, dirs, files in os.walk(directory):
        for f in files:
            mimetype = magic_cookie.file(os.path.join(root, f))
            if mimetype not in whitelisted_mimetypes:
                if not [x for x in whitelisted_extensions
                        if f.lower().endswith(x)]:
                    if verbose:
                        print "%s (%s)" % (os.path.join(root, f), mimetype)
                    else:
                        print os.path.join(root, f)
        for vcs_dir in (".bzr", "CVS", ".git", ".svn", ".hg", "_darcs"):
            if vcs_dir in dirs:
                dirs.remove(vcs_dir)

def main():
    script_name = os.path.basename(sys.argv[0])
    usage = "%s [options]" % (script_name)
    epilog = "See %s(1) for more info." % (script_name)
    parser = optparse.OptionParser(usage=usage, epilog=epilog)

    parser.add_option("-v", "--verbose", help="print more information",
                      dest="verbose", action="store_true", default=False)
    parser.add_option("-d", "--directory",
                      help="check the files in the specified directory",
                      dest="directory", default=".")
    parser.add_option("-m", "--mimetype", metavar="MIMETYPE",
                      help="Add MIMETYPE to list of whitelisted mimetypes.",
                      dest="whitelisted_mimetypes", action="append",
                      default=DEFAULT_WHITELISTED_MIMETYPES)
    parser.add_option("-e", "--extension", metavar="EXTENSION",
                      help="Add EXTENSION to list of whitelisted extensions.",
                      dest="whitelisted_extensions", action="append",
                      default=DEFAULT_WHITELISTED_EXTENSIONS)

    (options, args) = parser.parse_args()

    if len(args) != 0:
        Logger.error("This script does not take any additional parameters.")
        sys.exit(1)

    whitelisted_extensions = [x.lower() for x in options.whitelisted_extensions]
    suspicious_source(options.whitelisted_mimetypes, whitelisted_extensions,
                      options.directory, options.verbose)

if __name__ == "__main__":
    main()