4 files changed, 59 insertions, 27 deletions

diff --git a/bitbake/lib/bb/data.py b/bitbake/lib/bb/data.py
index b2025f0694..21cdde04a8 100644
--- a/bitbake/lib/bb/data.py
+++ b/bitbake/lib/bb/data.py
@@ -96,6 +96,19 @@ def getVar(var, d, exp = 0):
     """
     return d.getVar(var,exp)
 
+
+def renameVar(key, newkey, d):
+    """Renames a variable from key to newkey
+
+    Example:
+        >>> d = init()
+        >>> setVar('TEST', 'testcontents', d)
+        >>> renameVar('TEST', 'TEST2', d)
+        >>> print getVar('TEST2', d)
+        testcontents
+    """
+    d.renameVar(key, newkey)
+
 def delVar(var, d):
     """Removes a variable from the data set
 
@@ -276,24 +289,8 @@ def expandKeys(alterdata, readdata = None):
         ekey = expand(key, readdata)
         if key == ekey:
             continue
-        val = getVar(key, alterdata)
-        if val is None:
-            continue
-#        import copy
-#        setVarFlags(ekey, copy.copy(getVarFlags(key, readdata)), alterdata)
-        setVar(ekey, val, alterdata)
-
-        for i in ('_append', '_prepend'):
-            dest = getVarFlag(ekey, i, alterdata) or []
-            src = getVarFlag(key, i, readdata) or []
-            dest.extend(src)
-            setVarFlag(ekey, i, dest, alterdata)
-            
-            if key in alterdata._special_values[i]:
-                alterdata._special_values[i].remove(key)
-                alterdata._special_values[i].add(ekey)
-
-        delVar(key, alterdata)
+
+        renameVar(key, ekey, alterdata)
 
 def expandData(alterdata, readdata = None):
     """For each variable in alterdata, expand it, and update the var contents.
diff --git a/bitbake/lib/bb/data_smart.py b/bitbake/lib/bb/data_smart.py
index ef1e9dda07..e879343f5d 100644
--- a/bitbake/lib/bb/data_smart.py
+++ b/bitbake/lib/bb/data_smart.py
@@ -170,6 +170,28 @@ class DataSmart:
             return self.expand(value,var)
         return value
 
+    def renameVar(self, key, newkey):
+        """
+        Rename the variable key to newkey 
+        """
+        val = self.getVar(key, 0)
+        if val is None:
+            return
+
+        self.setVar(newkey, val)
+
+        for i in ('_append', '_prepend'):
+            dest = self.getVarFlag(newkey, i) or []
+            src = self.getVarFlag(key, i) or []
+            dest.extend(src)
+            self.setVarFlag(newkey, i, dest)
+            
+            if self._special_values.has_key(i) and key in self._special_values[i]:
+                self._special_values[i].remove(key)
+                self._special_values[i].add(newkey)
+
+        self.delVar(key)
+
     def delVar(self,var):
         self.expand_cache = {}
         self.dict[var] = {}
diff --git a/bitbake/lib/bb/fetch/__init__.py b/bitbake/lib/bb/fetch/__init__.py
index 229b28c19d..bbff516ffc 100644
--- a/bitbake/lib/bb/fetch/__init__.py
+++ b/bitbake/lib/bb/fetch/__init__.py
@@ -24,7 +24,7 @@ BitBake build tools.
 #
 # Based on functions from the base bb module, Copyright 2003 Holger Schurig
 
-import os, re
+import os, re, fcntl
 import bb
 from   bb import data
 from   bb import persist_data
@@ -140,9 +140,21 @@ def go(d):
             # Touch md5 file to show activity
             os.utime(ud.md5, None)
             continue
+        lf = open(ud.lockfile, "a+")
+        fcntl.flock(lf.fileno(), fcntl.LOCK_EX)
+        if ud.localfile and not m.forcefetch(u, ud, d) and os.path.exists(ud.md5):
+            # If someone else fetched this before we got the lock, 
+            # notice and don't try again
+            os.utime(ud.md5, None)
+            fcntl.flock(lf.fileno(), fcntl.LOCK_UN)
+            lf.close
+            continue
         m.go(u, ud, d)
         if ud.localfile and not m.forcefetch(u, ud, d):
             Fetch.write_md5sum(u, ud, d)
+        fcntl.flock(lf.fileno(), fcntl.LOCK_UN)
+        lf.close
+
 
 def localpaths(d):
     """
@@ -264,6 +276,7 @@ class FetchData(object):
         else:
             self.localpath = self.method.localpath(self.url, self, d)
         self.md5 = self.localpath + '.md5'
+        self.lockfile = self.localpath + '.lock'
         # if user sets localpath for file, use it instead.
 
 
diff --git a/bitbake/lib/bb/runqueue.py b/bitbake/lib/bb/runqueue.py
index 21383f4206..c55a58da2b 100644
--- a/bitbake/lib/bb/runqueue.py
+++ b/bitbake/lib/bb/runqueue.py
@@ -22,7 +22,7 @@ Handles preparation and execution of a queue of tasks
 # with this program; if not, write to the Free Software Foundation, Inc.,
 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
-from bb import msg, data, fetch, event, mkdirhier, utils
+from bb import msg, data, event, mkdirhier, utils
 from sets import Set 
 import bb, os, sys
 import signal
@@ -113,7 +113,7 @@ class RunQueue:
                         # Won't be in build_targets if ASSUME_PROVIDED
                         if depid in taskData.build_targets:
                             depdata = taskData.build_targets[depid][0]
-                            if depdata:
+                            if depdata is not None:
                                 dep = taskData.fn_index[depdata]
                                 depends.append(taskData.gettask_id(dep, taskname))
 
@@ -123,7 +123,7 @@ class RunQueue:
                     for depid in taskData.rdepids[fnid]:
                         if depid in taskData.run_targets:
                             depdata = taskData.run_targets[depid][0]
-                            if depdata:
+                            if depdata is not None:
                                 dep = taskData.fn_index[depdata]
                                 depends.append(taskData.gettask_id(dep, taskname))
 
@@ -133,7 +133,7 @@ class RunQueue:
                     if depid in taskData.build_targets:
                         # Won't be in build_targets if ASSUME_PROVIDED
                         depdata = taskData.build_targets[depid][0]
-                        if depdata:
+                        if depdata is not None:
                             dep = taskData.fn_index[depdata]
                             depends.append(taskData.gettask_id(dep, idepend.split(":")[1]))
 
@@ -148,11 +148,11 @@ class RunQueue:
                     dep_seen.append(depid)
                     if depid in taskData.build_targets:
                         depdata = taskData.build_targets[depid][0]
-                        if depdata:
+                        if depdata is not None:
                             dep = taskData.fn_index[depdata]
                             # Need to avoid creating new tasks here
                             taskid = taskData.gettask_id(dep, taskname, False)
-                            if taskid:
+                            if taskid is not None:
                                 depends.append(taskid)
                                 fnid = taskData.tasks_fnid[taskid]
                             else:
@@ -180,11 +180,11 @@ class RunQueue:
                     rdep_seen.append(rdepid)
                     if rdepid in taskData.run_targets:
                         depdata = taskData.run_targets[rdepid][0]
-                        if depdata:
+                        if depdata is not None:
                             dep = taskData.fn_index[depdata]
                             # Need to avoid creating new tasks here
                             taskid = taskData.gettask_id(dep, taskname, False)
-                            if taskid:
+                            if taskid is not None:
                                 depends.append(taskid)
                                 fnid = taskData.tasks_fnid[taskid]
                             else: