[PATCH] build/ast: Create strong task add/del API in bb.build

[Richard Purdie <richard.purdie@linuxfoundation.org>]

Currently its near impossible to control task addition/deletion from
metadata context. This adds stong add/deltask API to bb.build
which is traditionally where it resided. The rather broken
remove_tasks function was removed, it didn't appear to do anything
useful or have any users.

This allows us to clean up hacks currently in use in metadata and use
standard API for it instead.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
diff --git a/bitbake/lib/bb/build.py b/bitbake/lib/bb/build.py
index 6b39526..1524da0 100644
--- a/bitbake/lib/bb/build.py
+++ b/bitbake/lib/bb/build.py
@@ -668,9 +668,36 @@ def add_tasks(tasklist, deltasklist, d):
     # don't assume holding a reference
     d.setVar('_task_deps', task_deps)
 
-def remove_task(task, kill, d):
-    """Remove an BB 'task'.
+def addtask(task, before, after, d):
+    if task[:3] != "do_":
+        task = "do_" + task
+
+    d.setVarFlag(task, "task", 1)
+    bbtasks = d.getVar('__BBTASKS') or []
+    if not task in bbtasks:
+        bbtasks.append(task)
+    d.setVar('__BBTASKS', bbtasks)
+
+    existing = d.getVarFlag(task, "deps") or []
+    if after is not None:
+        # set up deps for function
+        for entry in after.split():
+            if entry not in existing:
+                existing.append(entry)
+    d.setVarFlag(task, "deps", existing)
+    if before is not None:
+        # set up things that depend on this func
+        for entry in before.split():
+            existing = d.getVarFlag(entry, "deps") or []
+            if task not in existing:
+                d.setVarFlag(entry, "deps", [task] + existing)
+
+def deltask(task, d):
+    if task[:3] != "do_":
+        task = "do_" + task
+
+    bbtasks = d.getVar('__BBDELTASKS') or []
+    if not task in bbtasks:
+        bbtasks.append(task)
+    d.setVar('__BBDELTASKS', bbtasks)
 
-       If kill is 1, also remove tasks that depend on this task."""
-
-    d.delVarFlag(task, 'task')
diff --git a/bitbake/lib/bb/parse/ast.py b/bitbake/lib/bb/parse/ast.py
index 2036cd4..a202053 100644
--- a/bitbake/lib/bb/parse/ast.py
+++ b/bitbake/lib/bb/parse/ast.py
@@ -235,29 +235,7 @@ class AddTaskNode(AstNode):
         self.after = after
 
     def eval(self, data):
-        var = self.func
-        if self.func[:3] != "do_":
-            var = "do_" + self.func
-
-        data.setVarFlag(var, "task", 1)
-        bbtasks = data.getVar('__BBTASKS') or []
-        if not var in bbtasks:
-            bbtasks.append(var)
-        data.setVar('__BBTASKS', bbtasks)
-
-        existing = data.getVarFlag(var, "deps") or []
-        if self.after is not None:
-            # set up deps for function
-            for entry in self.after.split():
-                if entry not in existing:
-                    existing.append(entry)
-        data.setVarFlag(var, "deps", existing)
-        if self.before is not None:
-            # set up things that depend on this func
-            for entry in self.before.split():
-                existing = data.getVarFlag(entry, "deps") or []
-                if var not in existing:
-                    data.setVarFlag(entry, "deps", [var] + existing)
+        bb.build.addtask(self.func, self.before, self.after, data)
 
 class DelTaskNode(AstNode):
     def __init__(self, filename, lineno, func):
@@ -265,14 +243,7 @@ class DelTaskNode(AstNode):
         self.func = func
 
     def eval(self, data):
-        var = self.func
-        if self.func[:3] != "do_":
-            var = "do_" + self.func
-
-        bbtasks = data.getVar('__BBDELTASKS') or []
-        if not var in bbtasks:
-            bbtasks.append(var)
-        data.setVar('__BBDELTASKS', bbtasks)
+        bb.build.deltask(self.func, data)
 
 class BBHandlerNode(AstNode):
     def __init__(self, filename, lineno, fns):
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