Fixed grub verify_image_sign print

sonic_installer/bootloader/grub.py

@@ -173,8 +173,8 @@ def is_secure_upgrade_image_verification_supported(self):
         fi
         exit 0
         '''
-        verification_result = subprocess.run(['bash', '-c', check_if_verification_is_enabled_and_supported_code], check=True, capture_output=True)
-        click.echo(str(verification_result.stdout) + " " + str(verification_result.stderr))
+        verification_result = subprocess.run(['bash', '-c', check_if_verification_is_enabled_and_supported_code], check=True, capture_output=True, stderr=subprocess.STDOUT)
+        click.echo(verification_result.stdout.decode())
         return verification_result.returncode == 0
 
     def verify_image_sign(self, image_path):
@@ -184,8 +184,8 @@ def verify_image_sign(self, image_path):
         if not os.path.exists(script_path):
             click.echo("Unable to find verification script in path " + script_path)
             return False
-        verification_result = subprocess.run([script_path, image_path], capture_output=True)
-        click.echo(str(verification_result.stdout) + " " + str(verification_result.stderr))
+        verification_result = subprocess.run([script_path, image_path], capture_output=True, stderr=subprocess.STDOUT)
+        click.echo(verification_result.stdout.decode())
         return verification_result.returncode == 0
 
     @classmethod

tests/installer_bootloader_grub_test.py

@@ -93,6 +93,6 @@ def test_verify_image():
 
     bootloader = grub.GrubBootloader()
     image = f'{grub.IMAGE_PREFIX}expeliarmus-{grub.IMAGE_PREFIX}abcde'
-    assert bootloader.is_secure_upgrade_image_verification_supported()
+    assert not bootloader.is_secure_upgrade_image_verification_supported()
     # command should fail
     assert not bootloader.verify_image_sign(image)