trace: include filename when printing parser error messages

Improves error messages from:

  ValueError: Error on line 72: need more than 1 value to unpack

To

  ValueError: Error at /home/berrange/src/virt/qemu/trace-events:72:
    need more than 1 value to unpack

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20180306154650.24075-1-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/scripts/simpletrace.py b/scripts/simpletrace.py
index be3d1affaf..9d45c6ba4e 100755
--- a/scripts/simpletrace.py
+++ b/scripts/simpletrace.py
@@ -168,7 +168,7 @@ class Analyzer(object):
 def process(events, log, analyzer, read_header=True):
     """Invoke an analyzer on each event in a log."""
     if isinstance(events, str):
-        events = read_events(open(events, 'r'))
+        events = read_events(open(events, 'r'), events)
     if isinstance(log, str):
         log = open(log, 'rb')
 
@@ -233,7 +233,7 @@ def run(analyzer):
                          '<trace-file>\n' % sys.argv[0])
         sys.exit(1)
 
-    events = read_events(open(sys.argv[1], 'r'))
+    events = read_events(open(sys.argv[1], 'r'), sys.argv[1])
     process(events, sys.argv[2], analyzer, read_header=read_header)
 
 if __name__ == '__main__':