bitbake: build: Add find_stale_stamps function

Add a new function which compares the stamp filename we want (including
taskhash) with what is in the stamp directory (using the clean mask).
This tells us which stamp files are stale and are due to be rerun.

(Bitbake rev: b126a53882d202e4df0f9661303355c9fe9ec80e)

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

bitbake/lib/bb/build.py

@@ -854,6 +854,23 @@ def make_stamp(task, d, file_name = None):
         file_name = d.getVar('BB_FILENAME')
         bb.parse.siggen.dump_sigtask(file_name, task, stampbase, True)
 
+def find_stale_stamps(task, d, file_name=None):
+    current = stamp_internal(task, d, file_name)
+    current2 = stamp_internal(task + "_setscene", d, file_name)
+    cleanmask = stamp_cleanmask_internal(task, d, file_name)
+    found = []
+    for mask in cleanmask:
+        for name in glob.glob(mask):
+            if "sigdata" in name or "sigbasedata" in name:
+                continue
+            if name.endswith('.taint'):
+                continue
+            if name == current or name == current2:
+                continue
+            logger.debug2("Stampfile %s does not match %s or %s" % (name, current, current2))
+            found.append(name)
+    return found
+
 def del_stamp(task, d, file_name = None):
     """
     Removes a stamp for a given task