rm_work: Handle race with -inital tasks

There is a race with rm_work when tasks run deltask do_build since
do_rm_work becomes a floating task. Handle this by injecting
the populate_sysroot/lic dependencies manually if the tasks returned
are empty. This depends on a change to fix bb.build.preceedtask() in
bitbake too.

[YOCTO #12365]

(From OE-Core rev: 0f537d985b7b17af508a511fca8a4ec4b5804580)

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

meta/classes/rm_work.bbclass

@@ -166,6 +166,10 @@ python inject_rm_work() {
     deps = set(bb.build.preceedtask('do_build', True, d))
     deps.difference_update(('do_build', 'do_rm_work_all'))
 
+    # deps can be empty if do_build doesn't exist, e.g. *-inital recipes
+    if not deps:
+        deps = ["do_populate_sysroot", "do_populate_lic"]
+
     if pn in excludes:
         d.delVarFlag('rm_work_rootfs', 'cleandirs')
         d.delVarFlag('rm_work_populatesdk', 'cleandirs')
@@ -179,6 +183,8 @@ python inject_rm_work() {
         # work in the recipe itself.
         # In practice, addtask() here merely updates the dependencies.
         bb.build.addtask('do_rm_work', 'do_build', ' '.join(deps), d)
+        if "initial" in pn:
+            bb.warn(pn + "2: " + " ".join(deps))
 
     # Always update do_build_without_rm_work dependencies.
     bb.build.addtask('do_build_without_rm_work', '', ' '.join(deps), d)