bitbake: build/ast: Create strong task add/del API in bb.build

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.

(Bitbake rev: bf7138dd38fc1f8efca80891198e3422fef64093)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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
 
-       If kill is 1, also remove tasks that depend on this 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)
 
-    d.delVarFlag(task, 'task')