#!/usr/bin/python2.6
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#
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# CDDL HEADER START
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#
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# The contents of this file are subject to the terms of the
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# Common Development and Distribution License (the "License").
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# You may not use this file except in compliance with the License.
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#
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# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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# or http://www.opensolaris.org/os/licensing.
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# See the License for the specific language governing permissions
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# and limitations under the License.
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#
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# When distributing Covered Code, include this CDDL HEADER in each
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# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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# If applicable, add the following below this CDDL HEADER, with the
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# fields enclosed by brackets "[]" replaced with your own identifying
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# information: Portions Copyright [yyyy] [name of copyright owner]
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#
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# CDDL HEADER END
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#
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# Copyright (c) 2010, 2012, Oracle and/or its affiliates. All rights reserved.
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#
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#
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# fetch.py - a file download utility
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#
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# A simple program similiar to wget(1), but handles local file copy, ignores
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# directories, and verifies file hashes.
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#
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import os
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import sys
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import shutil
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from urllib import splittype
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from urllib2 import urlopen
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import hashlib
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def printIOError(e, txt):
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""" Function to decode and print IOError type exception """
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print "I/O Error: " + txt + ": "
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try:
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(code, message) = e
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print str(message) + " (" + str(code) + ")"
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except:
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print str(e)
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def validate(file, hash):
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algorithm, hashvalue = hash.split(':')
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# force migration away from sha1
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if algorithm == "sha1":
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algorithm = "sha256"
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try:
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m = hashlib.new(algorithm)
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except ValueError:
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return False
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while True:
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try:
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block = file.read()
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except IOError, err:
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print str(err),
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break
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m.update(block)
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if block == '':
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break
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return "%s:%s" % (algorithm, m.hexdigest())
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def validate_container(filename, hash):
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try:
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file = open(filename, 'r')
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except IOError as e:
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printIOError(e, "Can't open file " + filename)
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return False
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return validate(file, hash)
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def validate_payload(filename, hash):
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import re
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import gzip
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import bz2
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expr_bz = re.compile('.+\.bz2$', re.IGNORECASE)
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expr_gz = re.compile('.+\.gz$', re.IGNORECASE)
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expr_tgz = re.compile('.+\.tgz$', re.IGNORECASE)
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try:
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if expr_bz.match(filename):
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file = bz2.BZ2File(filename, 'r')
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elif expr_gz.match(filename):
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file = gzip.GzipFile(filename, 'r')
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elif expr_tgz.match(filename):
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file = gzip.GzipFile(filename, 'r')
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else:
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return False
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except IOError as e:
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printIOError(e, "Can't open archive " + filename)
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return False
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return validate(file, hash)
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def download(url, filename = None):
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src = None
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try:
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src = urlopen(url)
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except IOError as e:
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printIOError(e, "Can't open url " + url)
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return None
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# 3xx, 4xx and 5xx (f|ht)tp codes designate unsuccessfull action
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if src.getcode() and (3 <= int(src.getcode()/100) <= 5):
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print "Error code: " + str(src.getcode())
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return None
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if filename == None:
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filename = src.geturl().split('/')[-1]
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try:
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dst = open(filename, 'wb');
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except IOError as e:
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printIOError(e, "Can't open file " + filename + " for writing")
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src.close()
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return None
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while True:
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block = src.read()
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if block == '':
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break;
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dst.write(block)
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src.close()
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dst.close()
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# return the name of the file that we downloaded the data to.
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return filename
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def download_paths(search, filename, url):
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urls = list()
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if filename != None:
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tmp = os.getenv('DOWNLOAD_SEARCH_PATH')
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if tmp:
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search += tmp.split(' ')
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file = os.path.basename(filename)
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urls = [ base + '/' + file for base in search ]
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# filename should always be first
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if filename in urls:
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urls.remove(filename)
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urls.insert(0, filename)
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# command line url is a fallback, so it's last
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if url != None and url not in urls:
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urls.append(url)
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return urls
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def usage():
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print "Usage: %s [-f|--file (file)] [-l|--link] [-h|--hash (hash)] [-s|--search (search-dir)] --url (url)" % (sys.argv[0].split('/')[-1])
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sys.exit(1)
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def main():
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import getopt
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# FLUSH STDOUT
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sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
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file_arg = None
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link_arg = False
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hash_arg = None
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url_arg = None
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search_list = list()
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try:
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opts, args = getopt.getopt(sys.argv[1:], "f:h:ls:u:",
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["file=", "link", "hash=", "search=", "url="])
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except getopt.GetoptError, err:
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print str(err)
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usage()
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for opt, arg in opts:
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if opt in [ "-f", "--file" ]:
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file_arg = arg
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elif opt in [ "-l", "--link" ]:
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link_arg = True
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elif opt in [ "-h", "--hash" ]:
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hash_arg = arg
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elif opt in [ "-s", "--search" ]:
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search_list.append(arg)
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elif opt in [ "-u", "--url" ]:
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url_arg = arg
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else:
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assert False, "unknown option"
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if url_arg == None:
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usage()
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for url in download_paths(search_list, file_arg, url_arg):
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print "Source %s..." % url,
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scheme, path = splittype(url)
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name = file_arg
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if scheme in [ None, 'file' ]:
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if os.path.exists(path) == False:
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print "not found, skipping file copy"
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continue
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elif name != path:
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if link_arg == False:
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print "\n copying..."
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shutil.copy2(path, name)
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else:
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print "\n linking..."
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os.symlink(path, name)
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else:
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pass
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elif scheme in [ 'http', 'https', 'ftp' ]:
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print "\n downloading...",
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name = download(url, file_arg)
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if name == None:
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print "failed"
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continue
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print "\n validating...",
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if hash_arg == None:
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print "skipping (no hash)"
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sys.exit(0)
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realhash = validate_container(name, hash_arg)
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if realhash == hash_arg:
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print "ok"
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sys.exit(0)
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else:
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payloadhash = validate_payload(name, hash_arg)
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if payloadhash == hash_arg:
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print "ok"
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sys.exit(0)
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print "corruption detected"
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print " expected: %s" % hash_arg
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print " actual: %s" % realhash
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print " payload: %s" % payloadhash
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try:
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os.remove(name)
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except OSError:
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pass
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sys.exit(1)
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if __name__ == "__main__":
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main()
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