download_checkmd5.py

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#!/usr/bin/env python

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import hashlib
import os
import sys
import urllib
from optparse import OptionParser

NAME = 'download_checkmd5.py'


def main():
    parser = OptionParser(usage='usage: %prog URI dest [md5sum]', prog=NAME)
    options, args = parser.parse_args()
    md5sum = None
    if len(args) == 2:
        uri, dest = args
    elif len(args) == 3:
        uri, dest, md5sum = args
    else:
        parser.error('wrong number of arguments')

    # Create intermediate directories as necessary, #2970
    d = os.path.dirname(dest)
    if len(d) and not os.path.exists(d):
        os.makedirs(d)

    fresh = False
    if not os.path.exists(dest):
        sys.stdout.write('[rosbuild] Downloading %s to %s...' % (uri, dest))
        sys.stdout.flush()
        urllib.urlretrieve(uri, dest)
        sys.stdout.write('Done\n')
        fresh = True

    if md5sum:
        m = hashlib.md5(open(dest).read())
        d = m.hexdigest()

        print('[rosbuild] Checking md5sum on %s' % (dest))

        if d != md5sum:
            if not fresh:
                print('[rosbuild] WARNING: md5sum mismatch (%s != %s); re-downloading file %s' % (d, md5sum, dest))
                os.remove(dest)

                # Try one more time
                urllib.urlretrieve(uri, dest)
                m = hashlib.md5(open(dest).read())
                d = m.hexdigest()

            if d != md5sum:
                print('[rosbuild] ERROR: md5sum mismatch (%s != %s) on %s; aborting' % (d, md5sum, dest))
                return 1

    return 0


if __name__ == '__main__':
    sys.exit(main())