lava_wait_jobs.py: Extract trace data from LAVA log

To be used for code coverage purposes. Actual code goes into
codecov_helper module.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I81be8d007fd84dfa0110e478dbf5451c1a9eaff7
diff --git a/lava_helper/codecov_helper.py b/lava_helper/codecov_helper.py
index ad4ad55..3ab21de 100644
--- a/lava_helper/codecov_helper.py
+++ b/lava_helper/codecov_helper.py
@@ -22,6 +22,21 @@
     subprocess.check_call(cmd, shell=True, cwd=cwd)
 
 
+def extract_trace_data(lava_log_fname, job_dir):
+    last_fname = None
+    f_out = None
+    with open(lava_log_fname) as f_in:
+        for l in f_in:
+            if l.startswith("covtrace-"):
+                fname, l = l.split(" ", 1)
+                if fname != last_fname:
+                    if f_out:
+                        f_out.close()
+                    f_out = open(job_dir + "/" + fname, "w")
+                    last_fname = fname
+                f_out.write(l)
+
+
 def coverage_reports(jobs, user_args):
     lava = test_lava_dispatch_credentials(user_args)
     for job_id, info in jobs.items():