While the class in use, it adds a event handler at 'bb.event.BuildCompleted',
so after the build completed, it will dump the lockedsigs files.

Use SIGGEN_LOCKEDSIGS_CONFIG variable controls where to dump the lockedsigs 
file,
the default is placed into ${SSTATE_DIR}/locked-sigs.inc.

Signed-off-by: Hongxu Jia <[email protected]>
---
 meta/classes/sstate_lockedsig.bbclass | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 meta/classes/sstate_lockedsig.bbclass

diff --git a/meta/classes/sstate_lockedsig.bbclass 
b/meta/classes/sstate_lockedsig.bbclass
new file mode 100644
index 0000000..ea88260
--- /dev/null
+++ b/meta/classes/sstate_lockedsig.bbclass
@@ -0,0 +1,12 @@
+SIGGEN_LOCKEDSIGS_CONFIG ?= "${SSTATE_DIR}/locked-sigs.inc"
+addhandler sstate_dump_lockedsig
+sstate_dump_lockedsig[eventmask] = "bb.event.BuildCompleted"
+python sstate_dump_lockedsig() {
+    d = e.data
+    if e.getFailures():
+        return
+
+    if hasattr(bb.parse.siggen, "dump_lockedsigs"):
+        lockedsigs = d.getVar('SIGGEN_LOCKEDSIGS_CONFIG', True)
+        bb.parse.siggen.dump_lockedsigs(lockedsigs)
+}
-- 
1.9.1

-- 
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