userland-fetch revision 42
#!/usr/bin/python2.6
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License (the "License").
# You may not use this file except in compliance with the License.
#
# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
# or http://www.opensolaris.org/os/licensing.
# See the License for the specific language governing permissions
# and limitations under the License.
#
# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
# If applicable, add the following below this CDDL HEADER, with the
# fields enclosed by brackets "[]" replaced with your own identifying
# information: Portions Copyright [yyyy] [name of copyright owner]
#
# CDDL HEADER END
#
# Copyright (c) 2010, Oracle and/or it's affiliates. All rights reserved.
#
#
# fetch.py - a file download utility
#
# A simple program similiar to wget(1), but handles local file copy, ignores
# directories, and verifies file hashes.
#
import os
import sys
import shutil
from urllib import splittype, urlopen
def validate(filename, hash):
import hashlib
try:
file = open(filename, 'r')
except IOError:
return False
if (hash == None):
return True
algorithm, value = hash.split(':')
try:
m = hashlib.new(algorithm)
except ValueError:
return False
while True:
block = file.read()
m.update(block)
if block == '':
break
return m.hexdigest() == value
def download(url, filename = None):
src = None
try:
src = urlopen(url)
except IOError:
return None
if filename == None:
filename = src.geturl().split('/')[-1]
try:
dst = open(filename, 'wb');
except IOError:
src.close()
return None
while True:
block = src.read()
if block == '':
break;
dst.write(block)
src.close()
dst.close()
# return the name of the file that we downloaded the data to.
return filename
def download_paths(search, filename, url):
urls = list()
if filename != None:
tmp = os.getenv('DOWNLOAD_SEARCH_PATH')
if tmp:
search += tmp.split(' ')
file = os.path.basename(filename)
urls = [ base + '/' + file for base in search ]
# filename should always be first
if filename in urls:
urls.remove(filename)
urls.insert(0, filename)
# command line url is a fallback, so it's last
if url != None and url not in urls:
urls.append(url)
return urls
def usage():
print "Usage: %s [-f|--file (file)] [-l|--link] [-h|--hash (hash)] [-s|--search (search-dir)] --url (url)" % (sys.argv[0].split('/')[-1])
sys.exit(1)
def main():
import getopt
# FLUSH STDOUT
sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
file_arg = None
link_arg = False
hash_arg = None
url_arg = None
search_list = list()
try:
opts, args = getopt.getopt(sys.argv[1:], "f:h:ls:u:",
["file=", "link", "hash=", "search=", "url="])
except getopt.GetoptError, err:
print str(err)
usage()
for opt, arg in opts:
if opt in [ "-f", "--file" ]:
file_arg = arg
elif opt in [ "-l", "--link" ]:
link_arg = True
elif opt in [ "-h", "--hash" ]:
hash_arg = arg
elif opt in [ "-s", "--search" ]:
search_list.append(arg)
elif opt in [ "-u", "--url" ]:
url_arg = arg
else:
assert False, "unknown option"
if url_arg == None:
usage()
for url in download_paths(search_list, file_arg, url_arg):
print "Source %s..." % url,
scheme, path = splittype(url)
name = file_arg
if scheme in [ None, 'file' ]:
if os.path.exists(path) == False:
print "not found, skipping"
continue
elif name != path:
if link_arg == False:
print "copying...",
shutil.copy2(path, name)
else:
print "linking...",
os.symlink(path, name)
else:
pass
elif scheme in [ 'http', 'https', 'ftp' ]:
print "downloading...",
name = download(url, file_arg)
if name == None:
print "failed"
continue
print "validating...",
if validate(name, hash_arg):
print "ok"
sys.exit(0)
else:
print "corrupt"
try:
os.remove(name)
except OSError:
pass
sys.exit(1)
if __name__ == "__main__":
main()