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114 lines
2.6 KiB
Python
Executable File
114 lines
2.6 KiB
Python
Executable File
#! /usr/bin/env python
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"""
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A script that creates signed Python files.
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"""
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import os
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import argparse
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import subprocess
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def get_file_encoding(filename):
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"""
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Get the file encoding for the file with the given filename
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"""
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with open(filename, 'rb') as fp:
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# The encoding is usually specified on the second line
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txt = fp.read().splitlines()[1]
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txt = txt.decode('utf-8')
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if 'encoding' in txt:
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encoding = txt.split()[-1]
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else:
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encoding = 'utf-8' # default
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return str(encoding)
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def sign_file_and_get_sig(filename, encoding):
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"""
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Sign the file and get the signature
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"""
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cmd = 'gpg -bass {}'.format(filename)
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ret = subprocess.Popen(cmd, shell=True).wait()
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print ('-> %r' % cmd)
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if ret:
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raise ValueError('Could not sign the file!')
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with open('{}.asc'.format(filename), 'rb') as fp:
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sig = fp.read()
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try:
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os.remove('{}.asc'.format(filename))
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except OSError:
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pass
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sig = sig.decode(encoding)
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sig = sig.replace('\r', '').replace('\n', '\\n')
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sig = sig.encode(encoding)
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return sig
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def sign_original_file(filename, encoding):
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"""
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Sign the original file
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"""
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sig = sign_file_and_get_sig(filename, encoding)
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with open(filename, 'ab') as outfile:
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outfile.write('#'.encode(encoding))
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outfile.write(sig)
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outfile.write('\n'.encode(encoding))
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def create_signed_file(filename, encoding):
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"""
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Create a signed file
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"""
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sig = sign_file_and_get_sig(filename, encoding)
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name, extension = os.path.splitext(filename)
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new_file_name = '{}_signed{}'.format(name, extension)
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with open(new_file_name, 'wb') as outfile, \
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open(filename, 'rb') as infile:
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txt = infile.read()
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outfile.write(txt)
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outfile.write('#'.encode(encoding))
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outfile.write(sig)
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outfile.write('\n'.encode(encoding))
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def parse_args():
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parser = argparse.ArgumentParser()
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parser.add_argument('filenames', action='store', nargs='+',
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help='Files you wish to sign')
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parser.add_argument('--overwrite', action='store_true',
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dest='overwrite', default=False,
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help='Overwrite the original file'
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' (sign the original file)')
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opts = parser.parse_args()
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return opts
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if __name__ == '__main__':
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opts = parse_args()
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for filename in opts.filenames:
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encoding = get_file_encoding(filename)
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if opts.overwrite:
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sign_original_file(filename, encoding)
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else:
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create_signed_file(filename, encoding)
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