[Infra] Update print statements (#3305)

3 files changed, 15 insertions, 11 deletions

diff --git a/infra/base-images/base-builder/detect_repo.py b/infra/base-images/base-builder/detect_repo.py
index e4570ed76..272a915d3 100644
--- a/infra/base-images/base-builder/detect_repo.py
+++ b/infra/base-images/base-builder/detect_repo.py
@@ -26,6 +26,7 @@ seperated by a space.
 
 """
 import argparse
+import logging
 import os
 import subprocess
 
@@ -64,8 +65,8 @@ def main():
     if args.repo_name and check_for_repo_name(full_path, args.repo_name):
       print('Detected repo:', get_repo(full_path), full_path)
       return
-  print('No git repos with specific commit: %s found in %s' %
-        (args.example_commit, src_dir))
+  logging.error('No git repos with specific commit: %s found in %s',
+                args.example_commit, src_dir)
 
 
 def get_repo(repo_path):
diff --git a/infra/bisector.py b/infra/bisector.py
index 11ffd0189..9ea2221ea 100644
--- a/infra/bisector.py
+++ b/infra/bisector.py
@@ -31,6 +31,7 @@ This is done with the following steps:
 """
 
 import argparse
+import logging
 import tempfile
 
 import build_specified_commit
@@ -77,12 +78,13 @@ def main():
   error_sha = bisect(args.commit_old, args.commit_new, args.testcase,
                      args.fuzz_target, build_data)
   if not error_sha:
-    print('No error was found in commit range %s:%s' %
-          (args.commit_old, args.commit_new))
+    logging.error('No error was found in commit range %s:%s', args.commit_old,
+                  args.commit_new)
     return 1
   if error_sha == args.commit_old:
-    print('Bisection Error: Both the first and the last commits in the given ' +
-          'range have the same behavior, bisection is not possible. ')
+    logging.error(
+        'Bisection Error: Both the first and the last commits in'
+        'the given range have the same behavior, bisection is not possible. ')
     return 1
   print('Error was introduced at commit %s' % error_sha)
   return 0
diff --git a/infra/build_specified_commit.py b/infra/build_specified_commit.py
index a4f95eb67..85f844ad2 100644
--- a/infra/build_specified_commit.py
+++ b/infra/build_specified_commit.py
@@ -19,9 +19,9 @@ like continuious integration fuzzing and bisection to find errors
 """
 import os
 import collections
+import logging
 import re
 import subprocess
-import sys
 
 import helper
 import utils
@@ -68,16 +68,17 @@ def detect_main_repo(project_name, repo_name=None, commit=None):
   """
 
   if not repo_name and not commit:
-    print('Error: can not detect main repo without a repo_name or a commit.')
+    logging.error(
+        'Error: can not detect main repo without a repo_name or a commit.')
     return None, None
   if repo_name and commit:
-    print('Both repo name and commit specific. Using repo name for detection.')
+    logging.info(
+        'Both repo name and commit specific. Using repo name for detection.')
 
   # Change to oss-fuzz main directory so helper.py runs correctly.
   utils.chdir_to_root()
   if not helper.build_image_impl(project_name):
-    print('Error: building {} image failed.'.format(project_name),
-          file=sys.stderr)
+    logging.error('Error: building %s image failed.', project_name)
     return None, None
   docker_image_name = 'gcr.io/oss-fuzz/' + project_name
   command_to_run = [