revert changes in coverage_utils; remove warning lines in save

Author: addisoncrump

experiment/measurer/coverage_utils.py

@@ -150,11 +150,17 @@ def generate_coverage_summary_json(self):
     def generate_coverage_report(self):
         """Generates the coverage report and stores in bucket."""
         command = [
-            'llvm-cov', 'show', '-format=html',
+            'llvm-cov',
+            'show',
+            '-format=html',
             f'-path-equivalence=/,{self.source_files_dir}',
-            f'-output-dir={self.report_dir}', '-Xdemangler', 'c++filt',
-            '-Xdemangler', '-n', self.binary_file,
-            f'-instr-profile={self.merged_profdata_file}'
+            f'-output-dir={self.report_dir}',
+            '-Xdemangler',
+            'c++filt',
+            '-Xdemangler',
+            '-n',
+            self.binary_file,
+            f'-instr-profile={self.merged_profdata_file}',
         ]
         result = new_process.execute(command, expect_zero=False)
         if result.retcode != 0:
@@ -258,9 +264,14 @@ def generate_json_summary(coverage_binary,
     """Generates the json summary file from |coverage_binary|
     and |profdata_file|."""
     command = [
-        'llvm-cov', 'export', '-format=text', '-num-threads=1',
-        '-region-coverage-gt=0', '-skip-expansions', coverage_binary,
-        f'-instr-profile={profdata_file}'
+        'llvm-cov',
+        'export',
+        '-format=text',
+        '-num-threads=1',
+        '-region-coverage-gt=0',
+        '-skip-expansions',
+        coverage_binary,
+        f'-instr-profile={profdata_file}',
     ]
 
     if summary_only:

experiment/measurer/measure_manager.py

@@ -626,7 +626,8 @@ def measure_snapshot_coverage(  # pylint: disable=too-many-locals
 
     with gzip.open(str(coverage_archive_zipped), 'wb') as compressed:
         with open(snapshot_measurer.cov_summary_file, 'rb') as uncompressed:
-            compressed.write(uncompressed.read())
+            # avoid saving warnings so we can direct import with pandas
+            compressed.write(uncompressed.readlines()[-1])
 
     coverage_archive_dst = exp_path.filestore(coverage_archive_zipped)
     if filestore_utils.cp(coverage_archive_zipped,