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utils/trace_cmd: add trace_has_marker()

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Add a function to check whether a trace file contains start/stop markers
(actually only check for start marker -- stop marker is assumed).
This commit is contained in:
Sergei Trofimov 2018-05-11 15:45:25 +01:00 committed by Marc Bonnici
parent 795b3485ce
commit e7e272cd03
1 changed files with 9 additions and 0 deletions
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9
wa/utils/trace_cmd.py
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@ -325,3 +325,12 @@ class TraceCmdParser(object):
body_parser = regex_body_parser(body_parser)
yield TraceCmdEvent(parser=body_parser, **match.groupdict())
def trace_has_marker(filepath, max_lines_to_check=2000000):
with open(filepath) as fh:
for i, line in enumerate(fh):
if TRACE_MARKER_START in line:
return True
if i >= max_lines_to_check:
break
return False