log coverage errors

Signed-off-by: Anas Nashif <[email protected]>

Author: nashif

scripts/pylib/twister/twisterlib/coverage.py

@@ -161,7 +161,7 @@ def generate(self, outdir):
         if not self.coverage_capture and self.coverage_report and self.coverage_per_instance:
             build_dirs = [instance.build_dir for instance in self.instances.values()]
         reports = {}
-        with open(os.path.join(outdir, "coverage.log"), "a") as coveragelog:
+        with open(os.path.join(outdir, "coverage.log"), "w+") as coveragelog:
             ret, reports = self._generate(outdir, coveragelog, build_dirs)
             if ret == 0:
                 report_log = {
@@ -422,6 +422,8 @@ def collect_coverage(self, outdir, coverage_file, ztest_file, coveragelog):
         ret = subprocess.call(cmd, stdout=coveragelog, stderr=coveragelog)
         if ret:
             logger.error(f"GCOVR failed with {ret}")
+            coveragelog.seek(0)
+            logger.error(f"Coverage log contents:\n{coveragelog.read()}")
             return ret, []
 
         cmd = ["gcovr", "-r", self.base_dir] + self.options