[PATCH] build/siggen.py: Avoid removing too many stamps when cleaning

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

The "*" part of the mask is to ensure we clean both any stamp, and any
setscene varient. It turns out we would also trample other tasks,
e.g. do_package_write could trample do_package_write_rpm. do_package also
tramples do_package_write_* but this is less of an issue since the other
tasks depend on it.

Rather than use the wildcard, we can just use a list instead.

[YOCTO #3484]

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
diff --git a/bitbake/lib/bb/build.py b/bitbake/lib/bb/build.py
index 85af42c..8ff7fb2 100644
--- a/bitbake/lib/bb/build.py
+++ b/bitbake/lib/bb/build.py
@@ -491,9 +491,11 @@ def stamp_cleanmask_internal(taskname, d, file_name):
         extrainfo = d.getVarFlag(taskflagname, 'stamp-extra-info', True) or ""
 
     if not stamp:
-        return
+        return []
+
+    cleanmask = bb.parse.siggen.stampcleanmask(stamp, file_name, taskname, extrainfo)
 
-    return bb.parse.siggen.stampcleanmask(stamp, file_name, taskname, extrainfo)
+    return [cleanmask, cleanmask.replace(taskflagname, taskflagname + "_setscene")]
 
 def make_stamp(task, d, file_name = None):
     """
@@ -501,8 +503,8 @@ def make_stamp(task, d, file_name = None):
     (d can be a data dict or dataCache)
     """
     cleanmask = stamp_cleanmask_internal(task, d, file_name)
-    if cleanmask:
-        bb.utils.remove(cleanmask)
+    for mask in cleanmask:
+        bb.utils.remove(mask)
 
     stamp = stamp_internal(task, d, file_name)
     # Remove the file and recreate to force timestamp
diff --git a/bitbake/lib/bb/siggen.py b/bitbake/lib/bb/siggen.py
index ff70d4f..ba14940 100644
--- a/bitbake/lib/bb/siggen.py
+++ b/bitbake/lib/bb/siggen.py
@@ -49,7 +49,7 @@ class SignatureGenerator(object):
         return ("%s.%s.%s" % (stampbase, taskname, extrainfo)).rstrip('.')
 
     def stampcleanmask(self, stampbase, file_name, taskname, extrainfo):
-        return ("%s.%s*.%s" % (stampbase, taskname, extrainfo)).rstrip('.')
+        return ("%s.%s.%s" % (stampbase, taskname, extrainfo)).rstrip('.')
 
     def dump_sigtask(self, fn, task, stampbase, runtime):
         return
@@ -276,7 +276,6 @@ class SignatureGeneratorBasicHash(SignatureGeneratorBasic):
             k = fn + "." + taskname
         if clean:
             h = "*"
-            taskname = taskname + "*"
         elif k in self.taskhash:
             h = self.taskhash[k]
         else: