bitbake: Update along 1.8 branch

git-svn-id: https://svn.o-hand.com/repos/poky/trunk@2345 311d38ba-8fff-0310-9ca6-ca027cbcb966

4 files changed, 392 insertions, 158 deletions

diff --git a/bitbake/lib/bb/fetch/__init__.py b/bitbake/lib/bb/fetch/__init__.py
index 31a4adccb..6ebf5a34a 100644
--- a/bitbake/lib/bb/fetch/__init__.py
+++ b/bitbake/lib/bb/fetch/__init__.py
@@ -27,6 +27,12 @@ BitBake build tools.
 import os, re
 import bb
 from   bb import data
+from   bb import persist_data
+
+try:
+    import cPickle as pickle
+except ImportError:
+    import pickle
 
 class FetchError(Exception):
     """Exception raised when a download fails"""
@@ -74,78 +80,193 @@ def uri_replace(uri, uri_find, uri_replace, d):
     return bb.encodeurl(result_decoded)
 
 methods = []
-urldata = {}
-
-def init(urls = [], d = None):
-    if d == None:
-        bb.msg.debug(2, bb.msg.domain.Fetcher, "BUG init called with None as data object!!!")
-        return
-
-    for m in methods:
-        m.urls = []
 
-    for u in urls:
-        ud = initdata(u, d)
-        if ud.method:
-            ud.method.urls.append(u)
-
-def initdata(url, d):
-    fn = bb.data.getVar('FILE', d, 1)
-    if fn not in urldata:
-        urldata[fn] = {}
-    if url not in urldata[fn]:
-        ud = FetchData()
-        (ud.type, ud.host, ud.path, ud.user, ud.pswd, ud.parm) = bb.decodeurl(data.expand(url, d))
-        ud.date = Fetch.getSRCDate(ud, d)
-        for m in methods:
-            if m.supports(url, ud, d):
-                ud.localpath = m.localpath(url, ud, d)
-                ud.md5 = ud.localpath + '.md5'
-                # if user sets localpath for file, use it instead.
-                if "localpath" in ud.parm:
-                    ud.localpath = ud.parm["localpath"]
-                ud.method = m
-                break
-        urldata[fn][url] = ud
-    return urldata[fn][url]
-
-def go(d):
-    """Fetch all urls"""
+def fetcher_init(d):
+    """
+    Called to initilize the fetchers once the configuration data is known
+    Calls before this must not hit the cache.
+    """
+    pd = persist_data.PersistData(d)
+    # Clear any cached url data
+    pd.delDomain("BB_URLDATA")
+    # When to drop SCM head revisions should be controled by user policy
+    pd.delDomain("BB_URI_HEADREVS")
+    # Make sure our domains exist
+    pd.addDomain("BB_URLDATA")
+    pd.addDomain("BB_URI_HEADREVS")
+    pd.addDomain("BB_URI_LOCALCOUNT")
+
+# Function call order is usually:
+#   1. init
+#   2. go
+#   3. localpaths
+# localpath can be called at any time
+
+def init(urls, d, cache = True):
+    urldata = {}
+
+    if cache:
+        urldata, pd, fn = getdata(d)
+
+    for url in urls:
+        if url not in urldata:
+            ud = FetchData(url, d)
+            for m in methods:
+                if m.supports(url, ud, d):
+                    ud.init(m, d)
+                    ud.setup_localpath(d) 
+                    break
+            urldata[url] = ud
+
+    if cache:
+        pd.setValue("BB_URLDATA", fn, pickle.dumps(urldata, 0))
+
+    return urldata
+
+def getdata(d):
+    urldata = {}
     fn = bb.data.getVar('FILE', d, 1)
-    for m in methods:
-        for u in m.urls:
-            ud = urldata[fn][u]
-            if ud.localfile and not m.forcefetch(u, ud, d) and os.path.exists(urldata[fn][u].md5):
-                # File already present along with md5 stamp file
-                # Touch md5 file to show activity
-                os.utime(ud.md5, None)
-                continue
-            # RP - is olddir needed?
-            # olddir = os.path.abspath(os.getcwd())
-            m.go(u, ud	, d)
-            # os.chdir(olddir)
-            if ud.localfile and not m.forcefetch(u, ud, d):
-                Fetch.write_md5sum(u, ud, d)
-
-def localpaths(d):
-    """Return a list of the local filenames, assuming successful fetch"""
+    pd = persist_data.PersistData(d)
+    encdata = pd.getValue("BB_URLDATA", fn)
+    if encdata:
+        urldata = pickle.loads(str(encdata))
+
+    return urldata, pd, fn
+
+def go(d, urldata = None):
+    """
+    Fetch all urls
+    """
+    if not urldata:
+        urldata, pd, fn = getdata(d)
+
+    for u in urldata:
+        ud = urldata[u]
+        m = ud.method
+        if ud.localfile and not m.forcefetch(u, ud, d) and os.path.exists(ud.md5):
+            # File already present along with md5 stamp file
+            # Touch md5 file to show activity
+            os.utime(ud.md5, None)
+            continue
+        m.go(u, ud, d)
+        if ud.localfile and not m.forcefetch(u, ud, d):
+            Fetch.write_md5sum(u, ud, d)
+
+def localpaths(d, urldata = None):
+    """
+    Return a list of the local filenames, assuming successful fetch
+    """
     local = []
-    fn = bb.data.getVar('FILE', d, 1)
-    for m in methods:
-        for u in m.urls:
-            local.append(urldata[fn][u].localpath)
+    if not urldata:
+        urldata, pd, fn = getdata(d)
+
+    for u in urldata:
+        ud = urldata[u]      
+        local.append(ud.localpath)
+
     return local
 
-def localpath(url, d):
-    ud = initdata(url, d)
-    if ud.method:
-        return ud.localpath
+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 = []
+    urldata, pd, fn = getdata(d)
+    if len(urldata) == 0:
+        src_uri = bb.data.getVar('SRC_URI', d, 1).split()
+        for url in src_uri:
+            if url not in urldata:
+                ud = FetchData(url, d)
+                for m in methods:
+                    if m.supports(url, ud, d):
+                        ud.init(m, d)
+                        break
+                urldata[url] = ud
+                if ud.method.suppports_srcrev():
+                    scms.append(url)
+                    ud.setup_localpath(d) 
+    else:
+        for u in urldata:
+            ud = urldata[u]
+            if ud.method.suppports_srcrev():
+                scms.append(u)
+
+    if len(scms) == 0:
+        bb.msg.error(bb.msg.domain.Fetcher, "SRCREV was used yet no valid SCM was found in SRC_URI")
+        raise ParameterError
+
+    if len(scms) == 1:
+        return urldata[scms[0]].method.sortable_revision(scms[0], urldata[scms[0]], d)
+
+    bb.msg.error(bb.msg.domain.Fetcher, "Sorry, support for SRCREV_FORMAT still needs to be written")
+    raise ParameterError
+
+def localpath(url, d, cache = True):
+    """
+    Called from the parser with cache=False since the cache isn't ready 
+    at this point. Also called from classed in OE e.g. patch.bbclass
+    """
+    ud = init([url], d, cache)
+    if ud[url].method:
+        return ud[url].localpath
     return url
 
+def runfetchcmd(cmd, d, quiet = False):
+    """
+    Run cmd returning the command output
+    Raise an error if interrupted or cmd fails
+    Optionally echo command output to stdout
+    """
+    bb.msg.debug(1, bb.msg.domain.Fetcher, "Running %s" % cmd)
+
+    # Need to export PATH as binary could be in metadata paths
+    # rather than host provided
+    pathcmd = 'export PATH=%s; %s' % (data.expand('${PATH}', d), cmd)
+
+    stdout_handle = os.popen(pathcmd, "r")
+    output = ""
+
+    while 1:
+        line = stdout_handle.readline()
+        if not line:
+            break
+        if not quiet:
+            print line
+        output += line
+
+    status =  stdout_handle.close() or 0
+    signal = status >> 8
+    exitstatus = status & 0xff
+
+    if signal:
+        raise FetchError("Fetch command %s failed with signal %s, output:\n%s" % (pathcmd, signal, output))
+    elif status != 0:
+        raise FetchError("Fetch command %s failed with exit code %s, output:\n%s" % (pathcmd, status, output))
+
+    return output
+
 class FetchData(object):
     """Class for fetcher variable store"""
-    def __init__(self):
+    def __init__(self, url, d):
         self.localfile = ""
+        (self.type, self.host, self.path, self.user, self.pswd, self.parm) = bb.decodeurl(data.expand(url, d))
+        self.date = Fetch.getSRCDate(self, d)
+        self.url = url
+
+    def init(self, method, d):
+        self.method = method
+
+    def setup_localpath(self, d):
+        if "localpath" in self.parm:
+            self.localpath = self.parm["localpath"]
+        else:
+            self.localpath = self.method.localpath(self.url, self, d)
+        self.md5 = self.localpath + '.md5'
+        # if user sets localpath for file, use it instead.
 
 
 class Fetch(object):
@@ -182,6 +303,12 @@ class Fetch(object):
         """
         return False
 
+    def suppports_srcrev(self):
+        """
+        The fetcher supports auto source revisions (SRCREV)
+        """
+        return False
+
     def go(self, url, urldata, d):
         """
         Fetch urls
@@ -269,6 +396,50 @@ class Fetch(object):
         md5out.close()
     write_md5sum = staticmethod(write_md5sum)
 
+    def latest_revision(self, url, ud, d):
+        """
+        Look in the cache for the latest revision, if not present ask the SCM.
+        """
+        if not hasattr(self, "_latest_revision"):
+            raise ParameterError
+
+        pd = persist_data.PersistData(d)
+        key = self._revision_key(url, ud, d)
+        rev = pd.getValue("BB_URI_HEADREVS", key)
+        if rev != None:
+            return str(rev)
+
+        rev = self._latest_revision(url, ud, d)
+        pd.setValue("BB_URI_HEADREVS", key, rev)
+        return rev
+
+    def sortable_revision(self, url, ud, d):
+        """
+        
+        """
+        if hasattr(self, "_sortable_revision"):
+            return self._sortable_revision(url, ud, d)
+
+        pd = persist_data.PersistData(d)
+        key = self._revision_key(url, ud, d)
+        latest_rev = self.latest_revision(url, ud, d)
+        last_rev = pd.getValue("BB_URI_LOCALCOUNT", key + "_rev")
+        count = pd.getValue("BB_URI_LOCALCOUNT", key + "_count")
+
+        if last_rev == latest_rev:
+            return str(count + "+" + latest_rev)
+
+        if count is None:
+            count = "0"
+        else:
+            count = str(int(count) + 1)
+
+        pd.setValue("BB_URI_LOCALCOUNT", key + "_rev", latest_rev)
+        pd.setValue("BB_URI_LOCALCOUNT", key + "_count", count)
+
+        return str(count + "+" + latest_rev)
+
+
 import cvs
 import git
 import local
@@ -278,11 +449,11 @@ import svk
 import ssh
 import perforce
 
-methods.append(cvs.Cvs())
-methods.append(git.Git())
 methods.append(local.Local())
-methods.append(svn.Svn())
 methods.append(wget.Wget())
+methods.append(svn.Svn())
+methods.append(git.Git())
+methods.append(cvs.Cvs())
 methods.append(svk.Svk())
 methods.append(ssh.SSH())
 methods.append(perforce.Perforce())
diff --git a/bitbake/lib/bb/fetch/git.py b/bitbake/lib/bb/fetch/git.py
index c0cd27df0..7d55ee913 100644
--- a/bitbake/lib/bb/fetch/git.py
+++ b/bitbake/lib/bb/fetch/git.py
@@ -25,6 +25,7 @@ import bb
 from   bb    import data
 from   bb.fetch import Fetch
 from   bb.fetch import FetchError
+from   bb.fetch import runfetchcmd
 
 def prunedir(topdir):
     # Delete everything reachable from the directory named in 'topdir'.
@@ -35,19 +36,6 @@ def prunedir(topdir):
         for name in dirs:
             os.rmdir(os.path.join(root, name))
 
-def rungitcmd(cmd,d):
-
-    bb.msg.debug(1, bb.msg.domain.Fetcher, "Running %s" % cmd)
-
-    # Need to export PATH as git is likely to be in metadata paths 
-    # rather than host provided
-    pathcmd = 'export PATH=%s; %s' % (data.expand('${PATH}', d), cmd)
-
-    myret = os.system(pathcmd)
-
-    if myret != 0:
-        raise FetchError("Git: %s failed" % pathcmd)
-
 class Git(Fetch):
     """Class to fetch a module or modules from git repositories"""
     def supports(self, url, ud, d):
@@ -62,24 +50,22 @@ class Git(Fetch):
         if 'protocol' in ud.parm:
             ud.proto = ud.parm['protocol']
 
-        ud.tag = "master"
+        tag = data.getVar("SRCREV", d, 0)
         if 'tag' in ud.parm:
             ud.tag = ud.parm['tag']
+        elif tag and "get_srcrev" not in tag and len(tag) == 40:
+            ud.tag = tag
+        else:
+            ud.tag = self.latest_revision(url, ud, d)
 
         ud.localfile = data.expand('git_%s%s_%s.tar.gz' % (ud.host, ud.path.replace('/', '.'), ud.tag), d)
 
         return os.path.join(data.getVar("DL_DIR", d, True), ud.localfile)
 
-    def forcefetch(self, url, ud, d):
-        # tag=="master" must always update
-        if (ud.tag == "master"):
-            return True
-        return False
-
     def go(self, loc, ud, d):
         """Fetch url"""
 
-        if not self.forcefetch(loc, ud, d) and Fetch.try_mirror(d, ud.localfile):
+        if Fetch.try_mirror(d, ud.localfile):
             bb.msg.debug(1, bb.msg.domain.Fetcher, "%s already exists (or was stashed). Skipping git checkout." % ud.localpath)
             return
 
@@ -96,32 +82,50 @@ class Git(Fetch):
             if Fetch.try_mirror(d, repofilename):    
                 bb.mkdirhier(repodir)
                 os.chdir(repodir)
-                rungitcmd("tar -xzf %s" % (repofile),d)
+                runfetchcmd("tar -xzf %s" % (repofile), d)
             else:
-                rungitcmd("git clone -n %s://%s%s %s" % (ud.proto, ud.host, ud.path, repodir),d)
+                runfetchcmd("git clone -n %s://%s%s %s" % (ud.proto, ud.host, ud.path, repodir), d)
 
         os.chdir(repodir)
-        rungitcmd("git pull %s://%s%s" % (ud.proto, ud.host, ud.path),d)
-        rungitcmd("git pull --tags %s://%s%s" % (ud.proto, ud.host, ud.path),d)
-        rungitcmd("git prune-packed", d)
-        rungitcmd("git pack-redundant --all | xargs -r rm", d)
         # Remove all but the .git directory
-        rungitcmd("rm * -Rf", d)
+        runfetchcmd("rm * -Rf", d)
+        runfetchcmd("git pull %s://%s%s" % (ud.proto, ud.host, ud.path), d)
+        runfetchcmd("git pull --tags %s://%s%s" % (ud.proto, ud.host, ud.path), d)
+        runfetchcmd("git prune-packed", d)
+        runfetchcmd("git pack-redundant --all | xargs -r rm", d)
         # old method of downloading tags
-        #rungitcmd("rsync -a --verbose --stats --progress rsync://%s%s/ %s" % (ud.host, ud.path, os.path.join(repodir, ".git", "")),d)
+        #runfetchcmd("rsync -a --verbose --stats --progress rsync://%s%s/ %s" % (ud.host, ud.path, os.path.join(repodir, ".git", "")), d)
 
         os.chdir(repodir)
         bb.msg.note(1, bb.msg.domain.Fetcher, "Creating tarball of git repository")
-        rungitcmd("tar -czf %s %s" % (repofile, os.path.join(".", ".git", "*") ),d)
+        runfetchcmd("tar -czf %s %s" % (repofile, os.path.join(".", ".git", "*") ), d)
 
         if os.path.exists(codir):
             prunedir(codir)
 
         bb.mkdirhier(codir)
         os.chdir(repodir)
-        rungitcmd("git read-tree %s" % (ud.tag),d)
-        rungitcmd("git checkout-index -q -f --prefix=%s -a" % (os.path.join(codir, "git", "")),d)
+        runfetchcmd("git read-tree %s" % (ud.tag), d)
+        runfetchcmd("git checkout-index -q -f --prefix=%s -a" % (os.path.join(codir, "git", "")), d)
 
         os.chdir(codir)
         bb.msg.note(1, bb.msg.domain.Fetcher, "Creating tarball of git checkout")
-        rungitcmd("tar -czf %s %s" % (ud.localpath, os.path.join(".", "*") ),d)
+        runfetchcmd("tar -czf %s %s" % (ud.localpath, os.path.join(".", "*") ), d)
+
+        os.chdir(repodir)
+        prunedir(codir)
+
+    def suppports_srcrev(self):
+        return True
+
+    def _revision_key(self, url, ud, d):
+        """
+        Return a unique key for the url
+        """
+        return "git:" + ud.host + ud.path.replace('/', '.')
+
+    def _latest_revision(self, url, ud, d):
+
+        output = runfetchcmd("git ls-remote %s://%s%s" % (ud.proto, ud.host, ud.path), d, True)
+        return output.split()[0]
+
diff --git a/bitbake/lib/bb/fetch/perforce.py b/bitbake/lib/bb/fetch/perforce.py
index 125eb99aa..97b618228 100644
--- a/bitbake/lib/bb/fetch/perforce.py
+++ b/bitbake/lib/bb/fetch/perforce.py
@@ -125,7 +125,7 @@ class Perforce(Fetch):
         """
 
         # try to use the tarball stash
-        if not self.forcefetch(loc, ud, d) and Fetch.try_mirror(d, ud.localfile):
+        if Fetch.try_mirror(d, ud.localfile):
             bb.msg.debug(1, bb.msg.domain.Fetcher, "%s already exists or was mirrored, skipping perforce checkout." % ud.localpath)
             return
 
diff --git a/bitbake/lib/bb/fetch/svn.py b/bitbake/lib/bb/fetch/svn.py
index 120f4f853..ca12efe15 100644
--- a/bitbake/lib/bb/fetch/svn.py
+++ b/bitbake/lib/bb/fetch/svn.py
@@ -1,17 +1,12 @@
 # ex:ts=4:sw=4:sts=4:et
 # -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
 """
-BitBake 'Fetch' implementations
-
-This implementation is for svn. It is based on the cvs implementation.
+BitBake 'Fetch' implementation for svn.
 
 """
 
-# Copyright (C) 2004 Marcin Juszkiewicz
-#
-#   Classes for obtaining upstream sources for the
-#   BitBake build tools.
-#   Copyright (C) 2003, 2004  Chris Larson
+# Copyright (C) 2003, 2004  Chris Larson
+# Copyright (C) 2004        Marcin Juszkiewicz
 #
 # 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
@@ -35,6 +30,7 @@ from   bb import data
 from   bb.fetch import Fetch
 from   bb.fetch import FetchError
 from   bb.fetch import MissingParameterError
+from   bb.fetch import runfetchcmd
 
 class Svn(Fetch):
     """Class to fetch a module or modules from svn repositories"""
@@ -47,32 +43,54 @@ class Svn(Fetch):
     def localpath(self, url, ud, d):
         if not "module" in ud.parm:
             raise MissingParameterError("svn method needs a 'module' parameter")
-        else:
-            ud.module = ud.parm["module"]
 
-        ud.revision = ""
-        if 'rev' in ud.parm:
-            ud.revision = ud.parm['rev']
+        ud.module = ud.parm["module"]
+
+        # Create paths to svn checkouts
+        relpath = ud.path
+        if relpath.startswith('/'):
+            # Remove leading slash as os.path.join can't cope
+            relpath = relpath[1:]
+        ud.pkgdir = os.path.join(data.expand('${SVNDIR}', d), ud.host, relpath)
+        ud.moddir = os.path.join(ud.pkgdir, ud.module)
 
-        if ud.revision:
+        if 'rev' in ud.parm:
             ud.date = ""
+            ud.revision = ud.parm['rev']
+        elif 'date' in ud.date:
+            ud.date = ud.parm['date']
+            ud.revision = ""
+        else:
+            #
+            # ***Nasty hacks***
+            # If DATE in unexpanded PV, use ud.date (which is set from SRCDATE)
+            # Will warn people to switch to SRCREV here
+            #
+            # How can we tell when a user has overriden SRCDATE? 
+            # check for "get_srcdate" in unexpanded SRCREV - ugly
+            #
+            pv = data.getVar("PV", d, 0)
+            if "DATE" in pv:
+                ud.revision = ""
+            else:
+                rev = data.getVar("SRCREV", d, 0)
+                if "get_srcrev" in rev:
+                    ud.revision = self.latest_revision(url, ud, d)
+                else:
+                    ud.revision = rev
+                ud.date = ""
 
         ud.localfile = data.expand('%s_%s_%s_%s_%s.tar.gz' % (ud.module.replace('/', '.'), ud.host, ud.path.replace('/', '.'), ud.revision, ud.date), d)
 
         return os.path.join(data.getVar("DL_DIR", d, True), ud.localfile)
 
-    def forcefetch(self, url, ud, d):
-        if (ud.date == "now"):
-            return True
-        return False
-
-    def go(self, loc, ud, d):
-        """Fetch url"""
+    def _buildsvncommand(self, ud, d, command):
+        """
+        Build up an svn commandline based on ud
+        command is "fetch", "update", "info"
+        """
 
-        # try to use the tarball stash
-        if not self.forcefetch(loc, ud, d) and Fetch.try_mirror(d, ud.localfile):
-            bb.msg.debug(1, bb.msg.domain.Fetcher, "%s already exists or was mirrored, skipping svn checkout." % ud.localpath)
-            return
+        basecmd = data.expand('${FETCHCMD_svn}', d)
 
         proto = "svn"
         if "proto" in ud.parm:
@@ -84,12 +102,8 @@ class Svn(Fetch):
 
         svnroot = ud.host + ud.path
 
-        # either use the revision, or SRCDATE in braces, or nothing for SRCDATE = "now"
+        # either use the revision, or SRCDATE in braces,
         options = []
-        if ud.revision:
-            options.append("-r %s" % ud.revision)
-        elif ud.date != "now":
-            options.append("-r {%s}" % ud.date)
 
         if ud.user:
             options.append("--username %s" % ud.user)
@@ -97,48 +111,93 @@ class Svn(Fetch):
         if ud.pswd:
             options.append("--password %s" % ud.pswd)
 
-        localdata = data.createCopy(d)
-        data.setVar('OVERRIDES', "svn:%s" % data.getVar('OVERRIDES', localdata), localdata)
-        data.update_data(localdata)
-
-        data.setVar('SVNROOT', "%s://%s/%s" % (proto, svnroot, ud.module), localdata)
-        data.setVar('SVNCOOPTS', " ".join(options), localdata)
-        data.setVar('SVNMODULE', ud.module, localdata)
-        svncmd = data.getVar('FETCHCOMMAND', localdata, 1)
-        svnupcmd = data.getVar('UPDATECOMMAND', localdata, 1)
+        if command is "info":
+            svncmd = "%s info %s %s://%s/%s/" % (basecmd, " ".join(options), proto, svnroot, ud.module)
+        else:
+            if ud.revision:
+                options.append("-r %s" % ud.revision)
+            elif ud.date:
+                options.append("-r {%s}" % ud.date)
+
+            if command is "fetch":
+                svncmd = "%s co %s %s://%s/%s %s" % (basecmd, " ".join(options), proto, svnroot, ud.module, ud.module)
+            elif command is "update":
+                svncmd = "%s update %s" % (basecmd, " ".join(options))
+            else:
+                raise FetchError("Invalid svn command %s" % command)
 
         if svn_rsh:
             svncmd = "svn_RSH=\"%s\" %s" % (svn_rsh, svncmd)
-            svnupcmd = "svn_RSH=\"%s\" %s" % (svn_rsh, svnupcmd)
 
-        pkg = data.expand('${PN}', d)
-        pkgdir = os.path.join(data.expand('${SVNDIR}', localdata), pkg)
-        moddir = os.path.join(pkgdir, ud.module)
-        bb.msg.debug(2, bb.msg.domain.Fetcher, "Fetch: checking for module directory '" + moddir + "'")
+        return svncmd
+
+    def go(self, loc, ud, d):
+        """Fetch url"""
 
-        if os.access(os.path.join(moddir, '.svn'), os.R_OK):
+        # try to use the tarball stash
+        if Fetch.try_mirror(d, ud.localfile):
+            bb.msg.debug(1, bb.msg.domain.Fetcher, "%s already exists or was mirrored, skipping svn checkout." % ud.localpath)
+            return
+
+        bb.msg.debug(2, bb.msg.domain.Fetcher, "Fetch: checking for module directory '" + ud.moddir + "'")
+
+        if os.access(os.path.join(ud.moddir, '.svn'), os.R_OK):
+            svnupdatecmd = self._buildsvncommand(ud, d, "update")
             bb.msg.note(1, bb.msg.domain.Fetcher, "Update " + loc)
             # update sources there
-            os.chdir(moddir)
-            bb.msg.debug(1, bb.msg.domain.Fetcher, "Running %s" % svnupcmd)
-            myret = os.system(svnupcmd)
+            os.chdir(ud.moddir)
+            bb.msg.debug(1, bb.msg.domain.Fetcher, "Running %s" % svnupdatecmd)
+            runfetchcmd(svnupdatecmd, d)
         else:
+            svnfetchcmd = self._buildsvncommand(ud, d, "fetch")
             bb.msg.note(1, bb.msg.domain.Fetcher, "Fetch " + loc)
             # check out sources there
-            bb.mkdirhier(pkgdir)
-            os.chdir(pkgdir)
-            bb.msg.debug(1, bb.msg.domain.Fetcher, "Running %s" % svncmd)
-            myret = os.system(svncmd)
-
-        if myret != 0:
-            raise FetchError(ud.module)
+            bb.mkdirhier(ud.pkgdir)
+            os.chdir(ud.pkgdir)
+            bb.msg.debug(1, bb.msg.domain.Fetcher, "Running %s" % svnfetchcmd)
+            runfetchcmd(svnfetchcmd, d)
 
-        os.chdir(pkgdir)
+        os.chdir(ud.pkgdir)
         # tar them up to a defined filename
-        myret = os.system("tar -czf %s %s" % (ud.localpath, os.path.basename(ud.module)))
-        if myret != 0:
+        try:
+            runfetchcmd("tar -czf %s %s" % (ud.localpath, os.path.basename(ud.module)), d)
+        except:
+            t, v, tb = sys.exc_info()
             try:
                 os.unlink(ud.localpath)
             except OSError:
                 pass
-            raise FetchError(ud.module)
+            raise t, v, tb
+
+    def suppports_srcrev(self):
+        return True
+
+    def _revision_key(self, url, ud, d):
+        """
+        Return a unique key for the url
+        """
+        return "svn:" + ud.moddir
+
+    def _latest_revision(self, url, ud, d):
+        """
+        Return the latest upstream revision number
+        """
+        bb.msg.debug(2, bb.msg.domain.Fetcher, "SVN fetcher hitting network for %s" % url)
+
+        output = runfetchcmd("LANG=C LC_ALL=C " + self._buildsvncommand(ud, d, "info"), d, True)
+
+        revision = None
+        for line in output.splitlines():
+            if "Last Changed Rev" in line:
+                revision = line.split(":")[1].strip()
+
+        return revision
+
+    def _sortable_revision(self, url, ud, d):
+        """
+        Return a sortable revision number which in our case is the revision number
+        (use the cached version to avoid network access)
+        """
+
+        return self.latest_revision(url, ud, d)
+