bitbake: knotty: Add logging cleanup

Adds code to close all loggers when bitbake exits. This prevents
unclosed file ResourceWarnings. A form of this closing existed
previously, but was removed in the new logging code.

(Bitbake rev: b3f3779adf63c0d970462a558a6205da1d30c0ed)

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/msg.py

@@ -320,3 +320,14 @@ def setLoggingConfig(defaultconfig, userconfigfile=None):
         # TODO: I don't think that setting the global log level should be necessary
         #if newlevel < bb.msg.loggerDefaultLogLevel:
         #    bb.msg.loggerDefaultLogLevel = newlevel
+
+def cleanupLogging():
+    # Iterate through all the handlers and close them if possible. Fixes
+    # 'Unclosed resource' warnings when bitbake exits, see
+    # https://bugs.python.org/issue23010
+    handlers = set()
+    for logger_iter in logging.Logger.manager.loggerDict.keys():
+        handlers.update(logging.getLogger(logger_iter).handlers)
+
+    for h in handlers:
+        h.close()

bitbake/lib/bb/ui/knotty.py

@@ -823,4 +823,6 @@ def main(server, eventHandler, params, tf = TerminalFilter):
         if e.errno == errno.EPIPE:
             pass
 
+    bb.msg.cleanupLogging()
+
     return return_value