1 files changed, 1538 insertions, 0 deletions

diff --git a/bitbake/lib/bb/fetch2/__init__.py b/bitbake/lib/bb/fetch2/__init__.py
new file mode 100644
index 0000000000..451d104f67
--- /dev/null
+++ b/bitbake/lib/bb/fetch2/__init__.py
@@ -0,0 +1,1538 @@
+# ex:ts=4:sw=4:sts=4:et
+# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
+"""
+BitBake 'Fetch' implementations
+
+Classes for obtaining upstream sources for the
+BitBake build tools.
+"""
+
+# Copyright (C) 2003, 2004  Chris Larson
+# Copyright (C) 2012  Intel Corporation
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+# Based on functions from the base bb module, Copyright 2003 Holger Schurig
+
+from __future__ import absolute_import
+from __future__ import print_function
+import os, re
+import signal
+import glob
+import logging
+import urllib
+import urlparse
+if 'git' not in urlparse.uses_netloc:
+    urlparse.uses_netloc.append('git')
+from urlparse import urlparse
+import operator
+import bb.persist_data, bb.utils
+import bb.checksum
+from bb import data
+import bb.process
+import subprocess
+
+__version__ = "2"
+_checksum_cache = bb.checksum.FileChecksumCache()
+
+logger = logging.getLogger("BitBake.Fetcher")
+
+class BBFetchException(Exception):
+    """Class all fetch exceptions inherit from"""
+    def __init__(self, message):
+         self.msg = message
+         Exception.__init__(self, message)
+
+    def __str__(self):
+         return self.msg
+
+class MalformedUrl(BBFetchException):
+    """Exception raised when encountering an invalid url"""
+    def __init__(self, url):
+         msg = "The URL: '%s' is invalid and cannot be interpreted" % url
+         self.url = url
+         BBFetchException.__init__(self, msg)
+         self.args = (url,)
+
+class FetchError(BBFetchException):
+    """General fetcher exception when something happens incorrectly"""
+    def __init__(self, message, url = None):
+         if url:
+            msg = "Fetcher failure for URL: '%s'. %s" % (url, message)
+         else:
+            msg = "Fetcher failure: %s" % message
+         self.url = url
+         BBFetchException.__init__(self, msg)
+         self.args = (message, url)
+
+class ChecksumError(FetchError):
+    """Exception when mismatched checksum encountered"""
+    def __init__(self, message, url = None, checksum = None):
+        self.checksum = checksum
+        FetchError.__init__(self, message, url)
+
+class NoChecksumError(FetchError):
+    """Exception when no checksum is specified, but BB_STRICT_CHECKSUM is set"""
+
+class UnpackError(BBFetchException):
+    """General fetcher exception when something happens incorrectly when unpacking"""
+    def __init__(self, message, url):
+         msg = "Unpack failure for URL: '%s'. %s" % (url, message)
+         self.url = url
+         BBFetchException.__init__(self, msg)
+         self.args = (message, url)
+
+class NoMethodError(BBFetchException):
+    """Exception raised when there is no method to obtain a supplied url or set of urls"""
+    def __init__(self, url):
+         msg = "Could not find a fetcher which supports the URL: '%s'" % url
+         self.url = url
+         BBFetchException.__init__(self, msg)
+         self.args = (url,)
+
+class MissingParameterError(BBFetchException):
+    """Exception raised when a fetch method is missing a critical parameter in the url"""
+    def __init__(self, missing, url):
+         msg = "URL: '%s' is missing the required parameter '%s'" % (url, missing)
+         self.url = url
+         self.missing = missing
+         BBFetchException.__init__(self, msg)
+         self.args = (missing, url)
+
+class ParameterError(BBFetchException):
+    """Exception raised when a url cannot be proccessed due to invalid parameters."""
+    def __init__(self, message, url):
+         msg = "URL: '%s' has invalid parameters. %s" % (url, message)
+         self.url = url
+         BBFetchException.__init__(self, msg)
+         self.args = (message, url)
+
+class NetworkAccess(BBFetchException):
+    """Exception raised when network access is disabled but it is required."""
+    def __init__(self, url, cmd):
+         msg = "Network access disabled through BB_NO_NETWORK (or set indirectly due to use of BB_FETCH_PREMIRRORONLY) but access requested with command %s (for url %s)" % (cmd, url)
+         self.url = url
+         self.cmd = cmd
+         BBFetchException.__init__(self, msg)
+         self.args = (url, cmd)
+
+class NonLocalMethod(Exception):
+    def __init__(self):
+        Exception.__init__(self)
+
+
+class URI(object):
+    """
+    A class representing a generic URI, with methods for
+    accessing the URI components, and stringifies to the
+    URI.
+
+    It is constructed by calling it with a URI, or setting
+    the attributes manually:
+
+     uri = URI("http://example.com/")
+
+     uri = URI()
+     uri.scheme = 'http'
+     uri.hostname = 'example.com'
+     uri.path = '/'
+
+    It has the following attributes:
+
+      * scheme (read/write)
+      * userinfo (authentication information) (read/write)
+        * username (read/write)
+        * password (read/write)
+
+        Note, password is deprecated as of RFC 3986.
+
+      * hostname (read/write)
+      * port (read/write)
+      * hostport (read only)
+        "hostname:port", if both are set, otherwise just "hostname"
+      * path (read/write)
+      * path_quoted (read/write)
+        A URI quoted version of path
+      * params (dict) (read/write)
+      * relative (bool) (read only)
+        True if this is a "relative URI", (e.g. file:foo.diff)
+
+    It stringifies to the URI itself.
+
+    Some notes about relative URIs: while it's specified that
+    a URI beginning with <scheme>:// should either be directly
+    followed by a hostname or a /, the old URI handling of the
+    fetch2 library did not comform to this. Therefore, this URI
+    class has some kludges to make sure that URIs are parsed in
+    a way comforming to bitbake's current usage. This URI class
+    supports the following:
+
+     file:relative/path.diff (IETF compliant)
+     git:relative/path.git (IETF compliant)
+     git:///absolute/path.git (IETF compliant)
+     file:///absolute/path.diff (IETF compliant)
+
+     file://relative/path.diff (not IETF compliant)
+
+    But it does not support the following:
+
+     file://hostname/absolute/path.diff (would be IETF compliant)
+
+    Note that the last case only applies to a list of
+    "whitelisted" schemes (currently only file://), that requires
+    its URIs to not have a network location.
+    """
+
+    _relative_schemes = ['file', 'git']
+    _netloc_forbidden = ['file']
+
+    def __init__(self, uri=None):
+        self.scheme = ''
+        self.userinfo = ''
+        self.hostname = ''
+        self.port = None
+        self._path = ''
+        self.params = {}
+        self.relative = False
+
+        if not uri:
+            return
+
+        urlp = urlparse(uri)
+        self.scheme = urlp.scheme
+
+        # Convert URI to be relative
+        if urlp.scheme in self._netloc_forbidden:
+            uri = re.sub("(?<=:)//(?!/)", "", uri, 1)
+            urlp = urlparse(uri)
+
+        # Identify if the URI is relative or not
+        if urlp.scheme in self._relative_schemes and \
+           re.compile("^\w+:(?!//)").match(uri):
+            self.relative = True
+
+        if not self.relative:
+            self.hostname = urlp.hostname or ''
+            self.port = urlp.port
+
+            self.userinfo += urlp.username or ''
+
+            if urlp.password:
+                self.userinfo += ':%s' % urlp.password
+
+        # Do support params even for URI schemes that Python's
+        # urlparse doesn't support params for.
+        path = ''
+        param_str = ''
+        if not urlp.params:
+            path, param_str = (list(urlp.path.split(";", 1)) + [None])[:2]
+        else:
+            path = urlp.path
+            param_str = urlp.params
+
+        self.path = urllib.unquote(path)
+
+        if param_str:
+            self.params = self._param_dict(param_str)
+
+    def __str__(self):
+        userinfo = self.userinfo
+        if userinfo:
+            userinfo += '@'
+
+        return "%s:%s%s%s%s%s" % (
+            self.scheme,
+            '' if self.relative else '//',
+            userinfo,
+            self.hostport,
+            self.path_quoted,
+            self._param_str)
+
+    @property
+    def _param_str(self):
+        ret = ''
+        for key, val in self.params.items():
+            ret += ";%s=%s" % (key, val)
+        return ret
+
+    def _param_dict(self, param_str):
+        parm = {}
+
+        for keyval in param_str.split(";"):
+            key, val = keyval.split("=", 1)
+            parm[key] = val
+
+        return parm
+
+    @property
+    def hostport(self):
+        if not self.port:
+            return self.hostname
+        return "%s:%d" % (self.hostname, self.port)
+
+    @property
+    def path_quoted(self):
+        return urllib.quote(self.path)
+
+    @path_quoted.setter
+    def path_quoted(self, path):
+        self.path = urllib.unquote(path)
+
+    @property
+    def path(self):
+        return self._path
+
+    @path.setter
+    def path(self, path):
+        self._path = path
+
+        if re.compile("^/").match(path):
+            self.relative = False
+        else:
+            self.relative = True
+
+    @property
+    def username(self):
+        if self.userinfo:
+            return (self.userinfo.split(":", 1))[0]
+        return ''
+
+    @username.setter
+    def username(self, username):
+        self.userinfo = username
+        if self.password:
+            self.userinfo += ":%s" % self.password
+
+    @property
+    def password(self):
+        if self.userinfo and ":" in self.userinfo:
+            return (self.userinfo.split(":", 1))[1]
+        return ''
+
+    @password.setter
+    def password(self, password):
+        self.userinfo = "%s:%s" % (self.username, password)
+
+def decodeurl(url):
+    """Decodes an URL into the tokens (scheme, network location, path,
+    user, password, parameters).
+    """
+
+    m = re.compile('(?P<type>[^:]*)://((?P<user>.+)@)?(?P<location>[^;]+)(;(?P<parm>.*))?').match(url)
+    if not m:
+        raise MalformedUrl(url)
+
+    type = m.group('type')
+    location = m.group('location')
+    if not location:
+        raise MalformedUrl(url)
+    user = m.group('user')
+    parm = m.group('parm')
+
+    locidx = location.find('/')
+    if locidx != -1 and type.lower() != 'file':
+        host = location[:locidx]
+        path = location[locidx:]
+    else:
+        host = ""
+        path = location
+    if user:
+        m = re.compile('(?P<user>[^:]+)(:?(?P<pswd>.*))').match(user)
+        if m:
+            user = m.group('user')
+            pswd = m.group('pswd')
+    else:
+        user = ''
+        pswd = ''
+
+    p = {}
+    if parm:
+        for s in parm.split(';'):
+            s1, s2 = s.split('=')
+            p[s1] = s2
+
+    return type, host, urllib.unquote(path), user, pswd, p
+
+def encodeurl(decoded):
+    """Encodes a URL from tokens (scheme, network location, path,
+    user, password, parameters).
+    """
+
+    type, host, path, user, pswd, p = decoded
+
+    if not path:
+        raise MissingParameterError('path', "encoded from the data %s" % str(decoded))
+    if not type:
+        raise MissingParameterError('type', "encoded from the data %s" % str(decoded))
+    url = '%s://' % type
+    if user and type != "file":
+        url += "%s" % user
+        if pswd:
+            url += ":%s" % pswd
+        url += "@"
+    if host and type != "file":
+        url += "%s" % host
+    # Standardise path to ensure comparisons work
+    while '//' in path:
+        path = path.replace("//", "/")
+    url += "%s" % urllib.quote(path)
+    if p:
+        for parm in p:
+            url += ";%s=%s" % (parm, p[parm])
+
+    return url
+
+def uri_replace(ud, uri_find, uri_replace, replacements, d):
+    if not ud.url or not uri_find or not uri_replace:
+        logger.error("uri_replace: passed an undefined value, not replacing")
+        return None
+    uri_decoded = list(decodeurl(ud.url))
+    uri_find_decoded = list(decodeurl(uri_find))
+    uri_replace_decoded = list(decodeurl(uri_replace))
+    logger.debug(2, "For url %s comparing %s to %s" % (uri_decoded, uri_find_decoded, uri_replace_decoded))
+    result_decoded = ['', '', '', '', '', {}]
+    for loc, i in enumerate(uri_find_decoded):
+        result_decoded[loc] = uri_decoded[loc]
+        regexp = i
+        if loc == 0 and regexp and not regexp.endswith("$"):
+            # Leaving the type unanchored can mean "https" matching "file" can become "files"
+            # which is clearly undesirable.
+            regexp += "$"
+        if loc == 5:
+            # Handle URL parameters
+            if i:
+                # Any specified URL parameters must match
+                for k in uri_replace_decoded[loc]:
+                    if uri_decoded[loc][k] != uri_replace_decoded[loc][k]:
+                        return None
+            # Overwrite any specified replacement parameters
+            for k in uri_replace_decoded[loc]:
+                for l in replacements:
+                    uri_replace_decoded[loc][k] = uri_replace_decoded[loc][k].replace(l, replacements[l])
+                result_decoded[loc][k] = uri_replace_decoded[loc][k]
+        elif (re.match(regexp, uri_decoded[loc])):
+            if not uri_replace_decoded[loc]:
+                result_decoded[loc] = ""    
+            else:
+                for k in replacements:
+                    uri_replace_decoded[loc] = uri_replace_decoded[loc].replace(k, replacements[k])
+                #bb.note("%s %s %s" % (regexp, uri_replace_decoded[loc], uri_decoded[loc]))
+                result_decoded[loc] = re.sub(regexp, uri_replace_decoded[loc], uri_decoded[loc])
+            if loc == 2:
+                # Handle path manipulations
+                basename = None
+                if uri_decoded[0] != uri_replace_decoded[0] and ud.mirrortarball:
+                    # If the source and destination url types differ, must be a mirrortarball mapping
+                    basename = os.path.basename(ud.mirrortarball)
+                    # Kill parameters, they make no sense for mirror tarballs
+                    uri_decoded[5] = {}
+                elif ud.localpath and ud.method.supports_checksum(ud):
+                    basename = os.path.basename(ud.localpath)
+                if basename and not result_decoded[loc].endswith(basename):
+                    result_decoded[loc] = os.path.join(result_decoded[loc], basename)
+        else:
+            return None
+    result = encodeurl(result_decoded)
+    if result == ud.url:
+        return None
+    logger.debug(2, "For url %s returning %s" % (ud.url, result))
+    return result
+
+methods = []
+urldata_cache = {}
+saved_headrevs = {}
+
+def fetcher_init(d):
+    """
+    Called to initialize the fetchers once the configuration data is known.
+    Calls before this must not hit the cache.
+    """
+    # When to drop SCM head revisions controlled by user policy
+    srcrev_policy = d.getVar('BB_SRCREV_POLICY', True) or "clear"
+    if srcrev_policy == "cache":
+        logger.debug(1, "Keeping SRCREV cache due to cache policy of: %s", srcrev_policy)
+    elif srcrev_policy == "clear":
+        logger.debug(1, "Clearing SRCREV cache due to cache policy of: %s", srcrev_policy)
+        revs = bb.persist_data.persist('BB_URI_HEADREVS', d)
+        try:
+            bb.fetch2.saved_headrevs = revs.items()
+        except:
+            pass
+        revs.clear()
+    else:
+        raise FetchError("Invalid SRCREV cache policy of: %s" % srcrev_policy)
+
+    _checksum_cache.init_cache(d)
+
+    for m in methods:
+        if hasattr(m, "init"):
+            m.init(d)
+
+def fetcher_parse_save(d):
+    _checksum_cache.save_extras(d)
+
+def fetcher_parse_done(d):
+    _checksum_cache.save_merge(d)
+
+def fetcher_compare_revisions(d):
+    """
+    Compare the revisions in the persistant cache with current values and
+    return true/false on whether they've changed.
+    """
+
+    data = bb.persist_data.persist('BB_URI_HEADREVS', d).items()
+    data2 = bb.fetch2.saved_headrevs
+
+    changed = False
+    for key in data:
+        if key not in data2 or data2[key] != data[key]:
+            logger.debug(1, "%s changed", key)
+            changed = True
+            return True
+        else:
+            logger.debug(2, "%s did not change", key)
+    return False
+
+def mirror_from_string(data):
+    return [ i.split() for i in (data or "").replace('\\n','\n').split('\n') if i ]
+
+def verify_checksum(u, ud, d):
+    """
+    verify the MD5 and SHA256 checksum for downloaded src
+
+    Raises a FetchError if one or both of the SRC_URI checksums do not match
+    the downloaded file, or if BB_STRICT_CHECKSUM is set and there are no
+    checksums specified.
+
+    """
+
+    if not ud.method.supports_checksum(ud):
+        return
+
+    md5data = bb.utils.md5_file(ud.localpath)
+    sha256data = bb.utils.sha256_file(ud.localpath)
+
+    if ud.method.recommends_checksum(ud):
+        # If strict checking enabled and neither sum defined, raise error
+        strict = d.getVar("BB_STRICT_CHECKSUM", True) or None
+        if (strict and ud.md5_expected == None and ud.sha256_expected == None):
+            raise NoChecksumError('No checksum specified for %s, please add at least one to the recipe:\n'
+                             'SRC_URI[%s] = "%s"\nSRC_URI[%s] = "%s"' %
+                             (ud.localpath, ud.md5_name, md5data,
+                              ud.sha256_name, sha256data), u)
+
+        # Log missing sums so user can more easily add them
+        if ud.md5_expected == None:
+            logger.warn('Missing md5 SRC_URI checksum for %s, consider adding to the recipe:\n'
+                        'SRC_URI[%s] = "%s"',
+                        ud.localpath, ud.md5_name, md5data)
+
+        if ud.sha256_expected == None:
+            logger.warn('Missing sha256 SRC_URI checksum for %s, consider adding to the recipe:\n'
+                        'SRC_URI[%s] = "%s"',
+                        ud.localpath, ud.sha256_name, sha256data)
+
+    md5mismatch = False
+    sha256mismatch = False
+
+    if ud.md5_expected != md5data:
+        md5mismatch = True
+
+    if ud.sha256_expected != sha256data:
+        sha256mismatch = True
+
+    # We want to alert the user if a checksum is defined in the recipe but
+    # it does not match.
+    msg = ""
+    mismatch = False
+    if md5mismatch and ud.md5_expected:
+        msg = msg + "\nFile: '%s' has %s checksum %s when %s was expected" % (ud.localpath, 'md5', md5data, ud.md5_expected)
+        mismatch = True;
+
+    if sha256mismatch and ud.sha256_expected:
+        msg = msg + "\nFile: '%s' has %s checksum %s when %s was expected" % (ud.localpath, 'sha256', sha256data, ud.sha256_expected)
+        mismatch = True;
+
+    if mismatch:
+        msg = msg + '\nIf this change is expected (e.g. you have upgraded to a new version without updating the checksums) then you can use these lines within the recipe:\nSRC_URI[%s] = "%s"\nSRC_URI[%s] = "%s"\nOtherwise you should retry the download and/or check with upstream to determine if the file has become corrupted or otherwise unexpectedly modified.\n' % (ud.md5_name, md5data, ud.sha256_name, sha256data)
+
+    if len(msg):
+        raise ChecksumError('Checksum mismatch!%s' % msg, u, md5data)
+
+
+def update_stamp(u, ud, d):
+    """
+        donestamp is file stamp indicating the whole fetching is done
+        this function update the stamp after verifying the checksum
+    """
+    if os.path.exists(ud.donestamp):
+        # Touch the done stamp file to show active use of the download
+        try:
+            os.utime(ud.donestamp, None)
+        except:
+            # Errors aren't fatal here
+            pass
+    else:
+        verify_checksum(u, ud, d)
+        open(ud.donestamp, 'w').close()
+
+def subprocess_setup():
+    # Python installs a SIGPIPE handler by default. This is usually not what
+    # non-Python subprocesses expect.
+    # SIGPIPE errors are known issues with gzip/bash
+    signal.signal(signal.SIGPIPE, signal.SIG_DFL)
+
+def get_autorev(d):
+    #  only not cache src rev in autorev case
+    if d.getVar('BB_SRCREV_POLICY', True) != "cache":
+        d.setVar('__BB_DONT_CACHE', '1')
+    return "AUTOINC"
+
+def get_srcrev(d):
+    """
+    Return the version string for the current package
+    (usually to be used as PV)
+    Most packages usually only have one SCM so we just pass on the call.
+    In the multi SCM case, we build a value based on SRCREV_FORMAT which must
+    have been set.
+    """
+
+    scms = []
+    fetcher = Fetch(d.getVar('SRC_URI', True).split(), d)
+    urldata = fetcher.ud
+    for u in urldata:
+        if urldata[u].method.supports_srcrev():
+            scms.append(u)
+
+    if len(scms) == 0:
+        raise FetchError("SRCREV was used yet no valid SCM was found in SRC_URI")
+
+    if len(scms) == 1 and len(urldata[scms[0]].names) == 1:
+        autoinc, rev = urldata[scms[0]].method.sortable_revision(scms[0], urldata[scms[0]], d, urldata[scms[0]].names[0])
+        if len(rev) > 10:
+            rev = rev[:10]
+        if autoinc:
+            return "AUTOINC+" + rev
+        return rev
+
+    #
+    # Mutiple SCMs are in SRC_URI so we resort to SRCREV_FORMAT
+    #
+    format = d.getVar('SRCREV_FORMAT', True)
+    if not format:
+        raise FetchError("The SRCREV_FORMAT variable must be set when multiple SCMs are used.")
+
+    seenautoinc = False
+    for scm in scms:
+        ud = urldata[scm]
+        for name in ud.names:
+            autoinc, rev = ud.method.sortable_revision(scm, ud, d, name)
+            seenautoinc = seenautoinc or autoinc
+            if len(rev) > 10:
+                rev = rev[:10]
+            format = format.replace(name, rev)
+    if seenautoinc:
+       format = "AUTOINC+" + format
+
+    return format
+
+def localpath(url, d):
+    fetcher = bb.fetch2.Fetch([url], d)
+    return fetcher.localpath(url)
+
+def runfetchcmd(cmd, d, quiet = False, cleanup = []):
+    """
+    Run cmd returning the command output
+    Raise an error if interrupted or cmd fails
+    Optionally echo command output to stdout
+    Optionally remove the files/directories listed in cleanup upon failure
+    """
+
+    # Need to export PATH as binary could be in metadata paths
+    # rather than host provided
+    # Also include some other variables.
+    # FIXME: Should really include all export varaiables?
+    exportvars = ['HOME', 'PATH',
+                  'HTTP_PROXY', 'http_proxy',
+                  'HTTPS_PROXY', 'https_proxy',
+                  'FTP_PROXY', 'ftp_proxy',
+                  'FTPS_PROXY', 'ftps_proxy',
+                  'NO_PROXY', 'no_proxy',
+                  'ALL_PROXY', 'all_proxy',
+                  'GIT_PROXY_COMMAND',
+                  'SSH_AUTH_SOCK', 'SSH_AGENT_PID',
+                  'SOCKS5_USER', 'SOCKS5_PASSWD']
+
+    for var in exportvars:
+        val = d.getVar(var, True)
+        if val:
+            cmd = 'export ' + var + '=\"%s\"; %s' % (val, cmd)
+
+    logger.debug(1, "Running %s", cmd)
+
+    success = False
+    error_message = ""
+
+    try:
+        (output, errors) = bb.process.run(cmd, shell=True, stderr=subprocess.PIPE)
+        success = True
+    except bb.process.NotFoundError as e:
+        error_message = "Fetch command %s" % (e.command)
+    except bb.process.ExecutionError as e:
+        if e.stdout:
+            output = "output:\n%s\n%s" % (e.stdout, e.stderr)
+        elif e.stderr:
+            output = "output:\n%s" % e.stderr
+        else:
+            output = "no output"
+        error_message = "Fetch command failed with exit code %s, %s" % (e.exitcode, output)
+    except bb.process.CmdError as e:
+        error_message = "Fetch command %s could not be run:\n%s" % (e.command, e.msg)
+    if not success:
+        for f in cleanup:
+            try:
+                bb.utils.remove(f, True)
+            except OSError:
+                pass
+
+        raise FetchError(error_message)
+
+    return output
+
+def check_network_access(d, info = "", url = None):
+    """
+    log remote network access, and error if BB_NO_NETWORK is set
+    """
+    if d.getVar("BB_NO_NETWORK", True) == "1":
+        raise NetworkAccess(url, info)
+    else:
+        logger.debug(1, "Fetcher accessed the network with the command %s" % info)
+
+def build_mirroruris(origud, mirrors, ld):
+    uris = []
+    uds = []
+
+    replacements = {}
+    replacements["TYPE"] = origud.type
+    replacements["HOST"] = origud.host
+    replacements["PATH"] = origud.path
+    replacements["BASENAME"] = origud.path.split("/")[-1]
+    replacements["MIRRORNAME"] = origud.host.replace(':','.') + origud.path.replace('/', '.').replace('*', '.')
+
+    def adduri(uri, ud, uris, uds):
+        for line in mirrors:
+            try:
+                (find, replace) = line
+            except ValueError:
+                continue
+            newuri = uri_replace(ud, find, replace, replacements, ld)
+            if not newuri or newuri in uris or newuri == origud.url:
+                continue
+            try:
+                newud = FetchData(newuri, ld)
+                newud.setup_localpath(ld)
+            except bb.fetch2.BBFetchException as e:
+                logger.debug(1, "Mirror fetch failure for url %s (original url: %s)" % (newuri, origud.url))
+                logger.debug(1, str(e))
+                try:
+                    ud.method.clean(ud, ld)
+                except UnboundLocalError:
+                    pass
+                continue   
+            uris.append(newuri)
+            uds.append(newud)
+
+            adduri(newuri, newud, uris, uds)
+
+    adduri(None, origud, uris, uds)
+
+    return uris, uds
+
+def rename_bad_checksum(ud, suffix):
+    """
+    Renames files to have suffix from parameter
+    """
+
+    if ud.localpath is None:
+        return
+
+    new_localpath = "%s_bad-checksum_%s" % (ud.localpath, suffix)
+    bb.warn("Renaming %s to %s" % (ud.localpath, new_localpath))
+    bb.utils.movefile(ud.localpath, new_localpath)
+
+
+def try_mirror_url(newuri, origud, ud, ld, check = False):
+    # Return of None or a value means we're finished
+    # False means try another url
+    try:
+        if check:
+            found = ud.method.checkstatus(newuri, ud, ld)
+            if found:
+                return found
+            return False
+
+        os.chdir(ld.getVar("DL_DIR", True))
+
+        if not os.path.exists(ud.donestamp) or ud.method.need_update(newuri, ud, ld):
+            ud.method.download(newuri, ud, ld)
+            if hasattr(ud.method,"build_mirror_data"):
+                ud.method.build_mirror_data(newuri, ud, ld)
+
+        if not ud.localpath or not os.path.exists(ud.localpath):
+            return False
+
+        if ud.localpath == origud.localpath:
+            return ud.localpath
+
+        # We may be obtaining a mirror tarball which needs further processing by the real fetcher
+        # If that tarball is a local file:// we need to provide a symlink to it
+        dldir = ld.getVar("DL_DIR", True)
+        if origud.mirrortarball and os.path.basename(ud.localpath) == os.path.basename(origud.mirrortarball) \
+                and os.path.basename(ud.localpath) != os.path.basename(origud.localpath):
+            bb.utils.mkdirhier(os.path.dirname(ud.donestamp))
+            open(ud.donestamp, 'w').close()
+            dest = os.path.join(dldir, os.path.basename(ud.localpath))
+            if not os.path.exists(dest):
+                os.symlink(ud.localpath, dest)
+            return None
+        # Otherwise the result is a local file:// and we symlink to it
+        if not os.path.exists(origud.localpath):
+            if os.path.islink(origud.localpath):
+                # Broken symbolic link
+                os.unlink(origud.localpath)
+
+            os.symlink(ud.localpath, origud.localpath)
+        update_stamp(newuri, origud, ld)
+        return ud.localpath
+
+    except bb.fetch2.NetworkAccess:
+        raise
+
+    except bb.fetch2.BBFetchException as e:
+        if isinstance(e, ChecksumError):
+            logger.warn("Mirror checksum failure for url %s (original url: %s)\nCleaning and trying again." % (newuri, origud.url))
+            logger.warn(str(e))
+            rename_bad_checksum(ud, e.checksum)
+        elif isinstance(e, NoChecksumError):
+            raise
+        else:
+            logger.debug(1, "Mirror fetch failure for url %s (original url: %s)" % (newuri, origud.url))
+            logger.debug(1, str(e))
+        try:
+            ud.method.clean(ud, ld)
+        except UnboundLocalError:
+            pass
+        return False
+
+def try_mirrors(d, origud, mirrors, check = False):
+    """
+    Try to use a mirrored version of the sources.
+    This method will be automatically called before the fetchers go.
+
+    d Is a bb.data instance
+    uri is the original uri we're trying to download
+    mirrors is the list of mirrors we're going to try
+    """
+    ld = d.createCopy()
+
+    uris, uds = build_mirroruris(origud, mirrors, ld)
+
+    for index, uri in enumerate(uris):
+        ret = try_mirror_url(uri, origud, uds[index], ld, check)
+        if ret != False:
+            return ret
+    return None
+
+def srcrev_internal_helper(ud, d, name):
+    """
+    Return:
+        a) a source revision if specified
+        b) latest revision if SRCREV="AUTOINC"
+        c) None if not specified
+    """
+
+    if 'rev' in ud.parm:
+        return ud.parm['rev']
+
+    if 'tag' in ud.parm:
+        return ud.parm['tag']
+
+    rev = None
+    pn = d.getVar("PN", True)
+    if name != '':
+        rev = d.getVar("SRCREV_%s_pn-%s" % (name, pn), True)
+        if not rev:
+            rev = d.getVar("SRCREV_%s" % name, True)
+    if not rev:
+        rev = d.getVar("SRCREV_pn-%s" % pn, True)
+    if not rev:
+        rev = d.getVar("SRCREV", True)
+    if rev == "INVALID":
+        var = "SRCREV_pn-%s" % pn
+        if name != '':
+            var = "SRCREV_%s_pn-%s" % (name, pn)
+        raise FetchError("Please set %s to a valid value" % var, ud.url)
+    if rev == "AUTOINC":
+        rev = ud.method.latest_revision(ud.url, ud, d, name)
+
+    return rev
+
+
+def get_checksum_file_list(d):
+    """ Get a list of files checksum in SRC_URI
+
+    Returns the resolved local paths of all local file entries in
+    SRC_URI as a space-separated string
+    """
+    fetch = Fetch([], d, cache = False, localonly = True)
+
+    dl_dir = d.getVar('DL_DIR', True)
+    filelist = []
+    for u in fetch.urls:
+        ud = fetch.ud[u]
+
+        if ud and isinstance(ud.method, local.Local):
+            ud.setup_localpath(d)
+            f = ud.localpath
+            if f.startswith(dl_dir):
+                # The local fetcher's behaviour is to return a path under DL_DIR if it couldn't find the file anywhere else
+                if os.path.exists(f):
+                    bb.warn("Getting checksum for %s SRC_URI entry %s: file not found except in DL_DIR" % (d.getVar('PN', True), os.path.basename(f)))
+                else:
+                    bb.warn("Unable to get checksum for %s SRC_URI entry %s: file could not be found" % (d.getVar('PN', True), os.path.basename(f)))
+                    continue
+            filelist.append(f)
+
+    return " ".join(filelist)
+
+
+def get_file_checksums(filelist, pn):
+    """Get a list of the checksums for a list of local files
+
+    Returns the checksums for a list of local files, caching the results as
+    it proceeds
+
+    """
+
+    def checksum_file(f):
+        try:
+            checksum = _checksum_cache.get_checksum(f)
+        except OSError as e:
+            bb.warn("Unable to get checksum for %s SRC_URI entry %s: %s" % (pn, os.path.basename(f), e))
+            return None
+        return checksum
+
+    checksums = []
+    for pth in filelist.split():
+        checksum = None
+        if '*' in pth:
+            # Handle globs
+            for f in glob.glob(pth):
+                checksum = checksum_file(f)
+                if checksum:
+                    checksums.append((f, checksum))
+        elif os.path.isdir(pth):
+            # Handle directories
+            for root, dirs, files in os.walk(pth):
+                for name in files:
+                    fullpth = os.path.join(root, name)
+                    checksum = checksum_file(fullpth)
+                    if checksum:
+                        checksums.append((fullpth, checksum))
+        else:
+            checksum = checksum_file(pth)
+
+        if checksum:
+            checksums.append((pth, checksum))
+
+    checksums.sort(key=operator.itemgetter(1))
+    return checksums
+
+
+class FetchData(object):
+    """
+    A class which represents the fetcher state for a given URI.
+    """
+    def __init__(self, url, d, localonly = False):
+        # localpath is the location of a downloaded result. If not set, the file is local.
+        self.donestamp = None
+        self.localfile = ""
+        self.localpath = None
+        self.lockfile = None
+        self.mirrortarball = None
+        self.basename = None
+        self.basepath = None
+        (self.type, self.host, self.path, self.user, self.pswd, self.parm) = decodeurl(data.expand(url, d))
+        self.date = self.getSRCDate(d)
+        self.url = url
+        if not self.user and "user" in self.parm:
+            self.user = self.parm["user"]
+        if not self.pswd and "pswd" in self.parm:
+            self.pswd = self.parm["pswd"]
+        self.setup = False
+
+        if "name" in self.parm:
+            self.md5_name = "%s.md5sum" % self.parm["name"]
+            self.sha256_name = "%s.sha256sum" % self.parm["name"]
+        else:
+            self.md5_name = "md5sum"
+            self.sha256_name = "sha256sum"
+        if self.md5_name in self.parm:
+            self.md5_expected = self.parm[self.md5_name]
+        elif self.type not in ["http", "https", "ftp", "ftps", "sftp"]:
+            self.md5_expected = None
+        else:
+            self.md5_expected = d.getVarFlag("SRC_URI", self.md5_name)
+        if self.sha256_name in self.parm:
+            self.sha256_expected = self.parm[self.sha256_name]
+        elif self.type not in ["http", "https", "ftp", "ftps", "sftp"]:
+            self.sha256_expected = None
+        else:
+            self.sha256_expected = d.getVarFlag("SRC_URI", self.sha256_name)
+
+        self.names = self.parm.get("name",'default').split(',')
+
+        self.method = None
+        for m in methods:
+            if m.supports(url, self, d):
+                self.method = m
+                break                
+
+        if not self.method:
+            raise NoMethodError(url)
+
+        if localonly and not isinstance(self.method, local.Local):
+            raise NonLocalMethod()
+
+        if self.parm.get("proto", None) and "protocol" not in self.parm:
+            logger.warn('Consider updating %s recipe to use "protocol" not "proto" in SRC_URI.', d.getVar('PN', True))
+            self.parm["protocol"] = self.parm.get("proto", None)
+
+        if hasattr(self.method, "urldata_init"):
+            self.method.urldata_init(self, d)
+
+        if "localpath" in self.parm:
+            # if user sets localpath for file, use it instead.
+            self.localpath = self.parm["localpath"]
+            self.basename = os.path.basename(self.localpath)
+        elif self.localfile:
+            self.localpath = self.method.localpath(self.url, self, d)
+
+        dldir = d.getVar("DL_DIR", True)
+        # Note: .done and .lock files should always be in DL_DIR whereas localpath may not be.
+        if self.localpath and self.localpath.startswith(dldir):
+            basepath = self.localpath
+        elif self.localpath:
+            basepath = dldir + os.sep + os.path.basename(self.localpath)
+        else:
+            basepath = dldir + os.sep + (self.basepath or self.basename)
+        self.donestamp = basepath + '.done'
+        self.lockfile = basepath + '.lock'
+
+    def setup_revisons(self, d):
+        self.revisions = {}
+        for name in self.names:
+            self.revisions[name] = srcrev_internal_helper(self, d, name)
+
+        # add compatibility code for non name specified case
+        if len(self.names) == 1:
+            self.revision = self.revisions[self.names[0]]
+
+    def setup_localpath(self, d):
+        if not self.localpath:
+            self.localpath = self.method.localpath(self.url, self, d)
+
+    def getSRCDate(self, d):
+        """
+        Return the SRC Date for the component
+
+        d the bb.data module
+        """
+        if "srcdate" in self.parm:
+            return self.parm['srcdate']
+
+        pn = d.getVar("PN", True)
+
+        if pn:
+            return d.getVar("SRCDATE_%s" % pn, True) or d.getVar("SRCDATE", True) or d.getVar("DATE", True)
+
+        return d.getVar("SRCDATE", True) or d.getVar("DATE", True)
+
+class FetchMethod(object):
+    """Base class for 'fetch'ing data"""
+
+    def __init__(self, urls = []):
+        self.urls = []
+
+    def supports(self, url, urldata, d):
+        """
+        Check to see if this fetch class supports a given url.
+        """
+        return 0
+
+    def localpath(self, url, urldata, d):
+        """
+        Return the local filename of a given url assuming a successful fetch.
+        Can also setup variables in urldata for use in go (saving code duplication
+        and duplicate code execution)
+        """
+        return os.path.join(data.getVar("DL_DIR", d, True), urldata.localfile)
+
+    def supports_checksum(self, urldata):
+        """
+        Is localpath something that can be represented by a checksum?
+        """
+
+        # We cannot compute checksums for directories
+        if os.path.isdir(urldata.localpath) == True:
+            return False
+        if urldata.localpath.find("*") != -1:
+             return False
+
+        return True
+
+    def recommends_checksum(self, urldata):
+        """
+        Is the backend on where checksumming is recommended (should warnings 
+        be displayed if there is no checksum)?
+        """
+        return False
+
+    def _strip_leading_slashes(self, relpath):
+        """
+        Remove leading slash as os.path.join can't cope
+        """
+        while os.path.isabs(relpath):
+            relpath = relpath[1:]
+        return relpath
+
+    def setUrls(self, urls):
+        self.__urls = urls
+
+    def getUrls(self):
+        return self.__urls
+
+    urls = property(getUrls, setUrls, None, "Urls property")
+
+    def need_update(self, url, ud, d):
+        """
+        Force a fetch, even if localpath exists?
+        """
+        if os.path.exists(ud.localpath):
+            return False
+        return True
+
+    def supports_srcrev(self):
+        """
+        The fetcher supports auto source revisions (SRCREV)
+        """
+        return False
+
+    def download(self, url, urldata, d):
+        """
+        Fetch urls
+        Assumes localpath was called first
+        """
+        raise NoMethodError(url)
+
+    def unpack(self, urldata, rootdir, data):
+        iterate = False
+        file = urldata.localpath
+
+        try:
+            unpack = bb.utils.to_boolean(urldata.parm.get('unpack'), True)
+        except ValueError as exc:
+            bb.fatal("Invalid value for 'unpack' parameter for %s: %s" %
+                     (file, urldata.parm.get('unpack')))
+
+        dots = file.split(".")
+        if dots[-1] in ['gz', 'bz2', 'Z', 'xz']:
+            efile = os.path.join(rootdir, os.path.basename('.'.join(dots[0:-1])))
+        else:
+            efile = file
+        cmd = None
+
+        if unpack:
+            if file.endswith('.tar'):
+                cmd = 'tar x --no-same-owner -f %s' % file
+            elif file.endswith('.tgz') or file.endswith('.tar.gz') or file.endswith('.tar.Z'):
+                cmd = 'tar xz --no-same-owner -f %s' % file
+            elif file.endswith('.tbz') or file.endswith('.tbz2') or file.endswith('.tar.bz2'):
+                cmd = 'bzip2 -dc %s | tar x --no-same-owner -f -' % file
+            elif file.endswith('.gz') or file.endswith('.Z') or file.endswith('.z'):
+                cmd = 'gzip -dc %s > %s' % (file, efile)
+            elif file.endswith('.bz2'):
+                cmd = 'bzip2 -dc %s > %s' % (file, efile)
+            elif file.endswith('.tar.xz'):
+                cmd = 'xz -dc %s | tar x --no-same-owner -f -' % file
+            elif file.endswith('.xz'):
+                cmd = 'xz -dc %s > %s' % (file, efile)
+            elif file.endswith('.zip') or file.endswith('.jar'):
+                try:
+                    dos = bb.utils.to_boolean(urldata.parm.get('dos'), False)
+                except ValueError as exc:
+                    bb.fatal("Invalid value for 'dos' parameter for %s: %s" %
+                             (file, urldata.parm.get('dos')))
+                cmd = 'unzip -q -o'
+                if dos:
+                    cmd = '%s -a' % cmd
+                cmd = "%s '%s'" % (cmd, file)
+            elif file.endswith('.rpm') or file.endswith('.srpm'):
+                if 'extract' in urldata.parm:
+                    unpack_file = urldata.parm.get('extract')
+                    cmd = 'rpm2cpio.sh %s | cpio -id %s' % (file, unpack_file)
+                    iterate = True
+                    iterate_file = unpack_file
+                else:
+                    cmd = 'rpm2cpio.sh %s | cpio -id' % (file)
+            elif file.endswith('.deb') or file.endswith('.ipk'):
+                cmd = 'ar -p %s data.tar.gz | zcat | tar --no-same-owner -xpf -' % file
+
+        if not unpack or not cmd:
+            # If file == dest, then avoid any copies, as we already put the file into dest!
+            dest = os.path.join(rootdir, os.path.basename(file))
+            if (file != dest) and not (os.path.exists(dest) and os.path.samefile(file, dest)):
+                if os.path.isdir(file):
+                    # If for example we're asked to copy file://foo/bar, we need to unpack the result into foo/bar
+                    basepath = getattr(urldata, "basepath", None)
+                    destdir = "."
+                    if basepath and basepath.endswith("/"):
+                        basepath = basepath.rstrip("/")
+                    elif basepath:
+                        basepath = os.path.dirname(basepath)
+                    if basepath and basepath.find("/") != -1:
+                        destdir = basepath[:basepath.rfind('/')]
+                        destdir = destdir.strip('/')
+                    if destdir != "." and not os.access("%s/%s" % (rootdir, destdir), os.F_OK):
+                        os.makedirs("%s/%s" % (rootdir, destdir))
+                    cmd = 'cp -pPR %s %s/%s/' % (file, rootdir, destdir)
+                    #cmd = 'tar -cf - -C "%d" -ps . | tar -xf - -C "%s/%s/"' % (file, rootdir, destdir)
+                else:
+                    # The "destdir" handling was specifically done for FILESPATH
+                    # items.  So, only do so for file:// entries.
+                    if urldata.type == "file" and urldata.path.find("/") != -1:
+                       destdir = urldata.path.rsplit("/", 1)[0]
+                    else:
+                       destdir = "."
+                    bb.utils.mkdirhier("%s/%s" % (rootdir, destdir))
+                    cmd = 'cp %s %s/%s/' % (file, rootdir, destdir)
+
+        if not cmd:
+            return
+
+        # Change to subdir before executing command
+        save_cwd = os.getcwd();
+        os.chdir(rootdir)
+        if 'subdir' in urldata.parm:
+            newdir = ("%s/%s" % (rootdir, urldata.parm.get('subdir')))
+            bb.utils.mkdirhier(newdir)
+            os.chdir(newdir)
+
+        path = data.getVar('PATH', True)
+        if path:
+            cmd = "PATH=\"%s\" %s" % (path, cmd)
+        bb.note("Unpacking %s to %s/" % (file, os.getcwd()))
+        ret = subprocess.call(cmd, preexec_fn=subprocess_setup, shell=True)
+
+        os.chdir(save_cwd)
+
+        if ret != 0:
+            raise UnpackError("Unpack command %s failed with return value %s" % (cmd, ret), urldata.url)
+
+        if iterate is True:
+            iterate_urldata = urldata
+            iterate_urldata.localpath = "%s/%s" % (rootdir, iterate_file)
+            self.unpack(urldata, rootdir, data)
+
+        return
+
+    def clean(self, urldata, d):
+       """
+       Clean any existing full or partial download
+       """
+       bb.utils.remove(urldata.localpath)
+
+    def try_premirror(self, url, urldata, d):
+        """
+        Should premirrors be used?
+        """
+        return True
+
+    def checkstatus(self, url, urldata, d):
+        """
+        Check the status of a URL
+        Assumes localpath was called first
+        """
+        logger.info("URL %s could not be checked for status since no method exists.", url)
+        return True
+
+    def latest_revision(self, url, ud, d, name):
+        """
+        Look in the cache for the latest revision, if not present ask the SCM.
+        """
+        if not hasattr(self, "_latest_revision"):
+            raise ParameterError("The fetcher for this URL does not support _latest_revision", url)
+
+        revs = bb.persist_data.persist('BB_URI_HEADREVS', d)
+        key = self.generate_revision_key(url, ud, d, name)
+        try:
+            return revs[key]
+        except KeyError:
+            revs[key] = rev = self._latest_revision(url, ud, d, name)
+            return rev
+
+    def sortable_revision(self, url, ud, d, name):
+        latest_rev = self._build_revision(url, ud, d, name)
+        return True, str(latest_rev)
+
+    def generate_revision_key(self, url, ud, d, name):
+        key = self._revision_key(url, ud, d, name)
+        return "%s-%s" % (key, d.getVar("PN", True) or "")
+
+class Fetch(object):
+    def __init__(self, urls, d, cache = True, localonly = False):
+        if localonly and cache:
+            raise Exception("bb.fetch2.Fetch.__init__: cannot set cache and localonly at same time")
+
+        if len(urls) == 0:
+            urls = d.getVar("SRC_URI", True).split()
+        self.urls = urls
+        self.d = d
+        self.ud = {}
+
+        fn = d.getVar('FILE', True)
+        if cache and fn and fn in urldata_cache:
+            self.ud = urldata_cache[fn]
+
+        for url in urls:
+            if url not in self.ud:
+                try:
+                    self.ud[url] = FetchData(url, d, localonly)
+                except NonLocalMethod:
+                    if localonly:
+                        self.ud[url] = None
+                        pass
+
+        if fn and cache:
+            urldata_cache[fn] = self.ud
+
+    def localpath(self, url):
+        if url not in self.urls:
+            self.ud[url] = FetchData(url, self.d)
+
+        self.ud[url].setup_localpath(self.d)
+        return self.d.expand(self.ud[url].localpath)
+
+    def localpaths(self):
+        """
+        Return a list of the local filenames, assuming successful fetch
+        """
+        local = []
+
+        for u in self.urls:
+            ud = self.ud[u]
+            ud.setup_localpath(self.d)
+            local.append(ud.localpath)
+
+        return local
+
+    def download(self, urls = []):
+        """
+        Fetch all urls
+        """
+        if len(urls) == 0:
+            urls = self.urls
+
+        network = self.d.getVar("BB_NO_NETWORK", True)
+        premirroronly = (self.d.getVar("BB_FETCH_PREMIRRORONLY", True) == "1")
+
+        for u in urls:
+            ud = self.ud[u]
+            ud.setup_localpath(self.d)
+            m = ud.method
+            localpath = ""
+
+            lf = bb.utils.lockfile(ud.lockfile)
+
+            try:
+                self.d.setVar("BB_NO_NETWORK", network)
+ 
+                if os.path.exists(ud.donestamp) and not m.need_update(u, ud, self.d):
+                    localpath = ud.localpath
+                elif m.try_premirror(u, ud, self.d):
+                    logger.debug(1, "Trying PREMIRRORS")
+                    mirrors = mirror_from_string(self.d.getVar('PREMIRRORS', True))
+                    localpath = try_mirrors(self.d, ud, mirrors, False)
+
+                if premirroronly:
+                    self.d.setVar("BB_NO_NETWORK", "1")
+
+                os.chdir(self.d.getVar("DL_DIR", True))
+
+                firsterr = None
+                if not localpath and ((not os.path.exists(ud.donestamp)) or m.need_update(u, ud, self.d)):
+                    try:
+                        logger.debug(1, "Trying Upstream")
+                        m.download(u, ud, self.d)
+                        if hasattr(m, "build_mirror_data"):
+                            m.build_mirror_data(u, ud, self.d)
+                        localpath = ud.localpath
+                        # early checksum verify, so that if checksum mismatched,
+                        # fetcher still have chance to fetch from mirror
+                        update_stamp(u, ud, self.d)
+
+                    except bb.fetch2.NetworkAccess:
+                        raise
+
+                    except BBFetchException as e:
+                        if isinstance(e, ChecksumError):
+                            logger.warn("Checksum failure encountered with download of %s - will attempt other sources if available" % u)
+                            logger.debug(1, str(e))
+                            rename_bad_checksum(ud, e.checksum)
+                        elif isinstance(e, NoChecksumError):
+                            raise
+                        else:
+                            logger.warn('Failed to fetch URL %s, attempting MIRRORS if available' % u)
+                            logger.debug(1, str(e))
+                        firsterr = e
+                        # Remove any incomplete fetch
+                        m.clean(ud, self.d)
+                        logger.debug(1, "Trying MIRRORS")
+                        mirrors = mirror_from_string(self.d.getVar('MIRRORS', True))
+                        localpath = try_mirrors (self.d, ud, mirrors)
+
+                if not localpath or ((not os.path.exists(localpath)) and localpath.find("*") == -1):
+                    if firsterr:
+                        logger.error(str(firsterr))
+                    raise FetchError("Unable to fetch URL from any source.", u)
+
+                update_stamp(u, ud, self.d)
+
+            except BBFetchException as e:
+                if isinstance(e, NoChecksumError):
+                    logger.error("%s" % str(e))
+                elif isinstance(e, ChecksumError):
+                    logger.error("Checksum failure fetching %s" % u)
+                raise
+
+            finally:
+                bb.utils.unlockfile(lf)
+
+    def checkstatus(self, urls = []):
+        """
+        Check all urls exist upstream
+        """
+
+        if len(urls) == 0:
+            urls = self.urls
+
+        for u in urls:
+            ud = self.ud[u]
+            ud.setup_localpath(self.d)
+            m = ud.method
+            logger.debug(1, "Testing URL %s", u)
+            # First try checking uri, u, from PREMIRRORS
+            mirrors = mirror_from_string(self.d.getVar('PREMIRRORS', True))
+            ret = try_mirrors(self.d, ud, mirrors, True)
+            if not ret:
+                # Next try checking from the original uri, u
+                try:
+                    ret = m.checkstatus(u, ud, self.d)
+                except:
+                    # Finally, try checking uri, u, from MIRRORS
+                    mirrors = mirror_from_string(self.d.getVar('MIRRORS', True))
+                    ret = try_mirrors(self.d, ud, mirrors, True)
+
+            if not ret:
+                raise FetchError("URL %s doesn't work" % u, u)
+
+    def unpack(self, root, urls = []):
+        """
+        Check all urls exist upstream
+        """
+
+        if len(urls) == 0:
+            urls = self.urls
+
+        for u in urls:
+            ud = self.ud[u]
+            ud.setup_localpath(self.d)
+
+            if self.d.expand(self.localpath) is None:
+                continue
+
+            if ud.lockfile:
+                lf = bb.utils.lockfile(ud.lockfile)
+
+            ud.method.unpack(ud, root, self.d)
+
+            if ud.lockfile:
+                bb.utils.unlockfile(lf)
+
+    def clean(self, urls = []):
+        """
+        Clean files that the fetcher gets or places
+        """
+
+        if len(urls) == 0:
+            urls = self.urls
+
+        for url in urls:
+            if url not in self.ud:
+                self.ud[url] = FetchData(url, d)
+            ud = self.ud[url]
+            ud.setup_localpath(self.d)
+
+            if not ud.localfile or self.localpath is None:
+                continue
+
+            if ud.lockfile:
+                lf = bb.utils.lockfile(ud.lockfile)
+
+            ud.method.clean(ud, self.d)
+            if ud.donestamp:
+                bb.utils.remove(ud.donestamp)
+
+            if ud.lockfile:
+                bb.utils.unlockfile(lf)
+
+from . import cvs
+from . import git
+from . import gitsm
+from . import local
+from . import svn
+from . import wget
+from . import svk
+from . import ssh
+from . import sftp
+from . import perforce
+from . import bzr
+from . import hg
+from . import osc
+from . import repo
+
+methods.append(local.Local())
+methods.append(wget.Wget())
+methods.append(svn.Svn())
+methods.append(git.Git())
+methods.append(gitsm.GitSM())
+methods.append(cvs.Cvs())
+methods.append(svk.Svk())
+methods.append(ssh.SSH())
+methods.append(sftp.SFTP())
+methods.append(perforce.Perforce())
+methods.append(bzr.Bzr())
+methods.append(hg.Hg())
+methods.append(osc.Osc())
+methods.append(repo.Repo())