fix: no error on database backups without source dirs

borgmatic/execute.py

@@ -11,7 +11,7 @@
 BORG_ERROR_EXIT_CODE = 2
 
 
-def exit_code_indicates_error(process, exit_code, borg_local_path=None):
+def exit_code_indicates_error(command, exit_code, borg_local_path=None):
     '''
     Return True if the given exit code from running a command corresponds to an error. If a Borg
     local path is given and matches the process' command, then treat exit code 1 as a warning
@@ -20,8 +20,6 @@ def exit_code_indicates_error(process, exit_code, borg_local_path=None):
     if exit_code is None:
         return False
 
-    command = process.args.split(' ') if isinstance(process.args, str) else process.args
-
     if borg_local_path and command[0] == borg_local_path:
         return bool(exit_code < 0 or exit_code >= BORG_ERROR_EXIT_CODE)
 
@@ -121,8 +119,9 @@ def log_outputs(processes, exclude_stdouts, output_log_level, borg_local_path):
             if exit_code is None:
                 still_running = True
 
+            command = process.args.split(' ') if isinstance(process.args, str) else process.args
             # If any process errors, then raise accordingly.
-            if exit_code_indicates_error(process, exit_code, borg_local_path):
+            if exit_code_indicates_error(command, exit_code, borg_local_path):
                 # If an error occurs, include its output in the raised exception so that we don't
                 # inadvertently hide error output.
                 output_buffer = output_buffer_for_process(process, exclude_stdouts)
@@ -228,13 +227,20 @@ def execute_command_and_capture_output(
     environment = {**os.environ, **extra_environment} if extra_environment else None
     command = ' '.join(full_command) if shell else full_command
 
-    output = subprocess.check_output(
-        command,
-        stderr=subprocess.STDOUT if capture_stderr else None,
-        shell=shell,
-        env=environment,
-        cwd=working_directory,
-    )
+    try:
+        output = subprocess.check_output(
+            command,
+            stderr=subprocess.STDOUT if capture_stderr else None,
+            shell=shell,
+            env=environment,
+            cwd=working_directory,
+        )
+        logger.warning('Command output: {}'.format(output))
+    except subprocess.CalledProcessError as error:
+        if exit_code_indicates_error(command, error.returncode):
+            raise
+        output = error.output
+        logger.warning('Command output: {}'.format(output))
 
     return output.decode() if output is not None else None
 

tests/integration/test_execute.py

@@ -138,10 +138,10 @@ def test_log_outputs_kills_other_processes_when_one_errors():
 
     process = subprocess.Popen(['grep'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
     flexmock(module).should_receive('exit_code_indicates_error').with_args(
-        process, None, 'borg'
+        ['grep'], None, 'borg'
     ).and_return(False)
     flexmock(module).should_receive('exit_code_indicates_error').with_args(
-        process, 2, 'borg'
+        ['grep'], 2, 'borg'
     ).and_return(True)
     other_process = subprocess.Popen(
         ['sleep', '2'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT
@@ -245,10 +245,10 @@ def test_log_outputs_truncates_long_error_output():
 
     process = subprocess.Popen(['grep'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
     flexmock(module).should_receive('exit_code_indicates_error').with_args(
-        process, None, 'borg'
+        ['grep'], None, 'borg'
     ).and_return(False)
     flexmock(module).should_receive('exit_code_indicates_error').with_args(
-        process, 2, 'borg'
+        ['grep'], 2, 'borg'
     ).and_return(True)
     flexmock(module).should_receive('output_buffer_for_process').and_return(process.stdout)
 

tests/unit/test_execute.py

@@ -7,32 +7,32 @@
 
 
 @pytest.mark.parametrize(
-    'process,exit_code,borg_local_path,expected_result',
+    'command,exit_code,borg_local_path,expected_result',
     (
-        (flexmock(args=['grep']), 2, None, True),
-        (flexmock(args=['grep']), 2, 'borg', True),
-        (flexmock(args=['borg']), 2, 'borg', True),
-        (flexmock(args=['borg1']), 2, 'borg1', True),
-        (flexmock(args=['grep']), 1, None, True),
-        (flexmock(args=['grep']), 1, 'borg', True),
-        (flexmock(args=['borg']), 1, 'borg', False),
-        (flexmock(args=['borg1']), 1, 'borg1', False),
-        (flexmock(args=['grep']), 0, None, False),
-        (flexmock(args=['grep']), 0, 'borg', False),
-        (flexmock(args=['borg']), 0, 'borg', False),
-        (flexmock(args=['borg1']), 0, 'borg1', False),
+        (['grep'], 2, None, True),
+        (['grep'], 2, 'borg', True),
+        (['borg'], 2, 'borg', True),
+        (['borg1'], 2, 'borg1', True),
+        (['grep'], 1, None, True),
+        (['grep'], 1, 'borg', True),
+        (['borg'], 1, 'borg', False),
+        (['borg1'], 1, 'borg1', False),
+        (['grep'], 0, None, False),
+        (['grep'], 0, 'borg', False),
+        (['borg'], 0, 'borg', False),
+        (['borg1'], 0, 'borg1', False),
         # -9 exit code occurs when child process get SIGKILLed.
-        (flexmock(args=['grep']), -9, None, True),
-        (flexmock(args=['grep']), -9, 'borg', True),
-        (flexmock(args=['borg']), -9, 'borg', True),
-        (flexmock(args=['borg1']), -9, 'borg1', True),
-        (flexmock(args=['borg']), None, None, False),
+        (['grep'], -9, None, True),
+        (['grep'], -9, 'borg', True),
+        (['borg'], -9, 'borg', True),
+        (['borg1'], -9, 'borg1', True),
+        (['borg'], None, None, False),
     ),
 )
 def test_exit_code_indicates_error_respects_exit_code_and_borg_local_path(
-    process, exit_code, borg_local_path, expected_result
+    command, exit_code, borg_local_path, expected_result
 ):
-    assert module.exit_code_indicates_error(process, exit_code, borg_local_path) is expected_result
+    assert module.exit_code_indicates_error(command, exit_code, borg_local_path) is expected_result
 
 
 def test_command_for_process_converts_sequence_command_to_string():
@@ -239,6 +239,34 @@ def test_execute_command_and_capture_output_with_capture_stderr_returns_stderr()
     assert output == expected_output
 
 
+def test_execute_command_and_capture_output_returns_output_when_error_code_is_one():
+    full_command = ['foo', 'bar']
+    expected_output = '[]'
+    err_output = b'[]'
+    flexmock(module.os, environ={'a': 'b'})
+    flexmock(module.subprocess).should_receive('check_output').with_args(
+        full_command, stderr=None, shell=False, env=None, cwd=None
+    ).and_raise(subprocess.CalledProcessError(1, full_command, err_output)).once()
+    flexmock(module).should_receive('exit_code_indicates_error').and_return(False).once()
+
+    output = module.execute_command_and_capture_output(full_command)
+
+    assert output == expected_output
+
+
+def test_execute_command_and_capture_output_raises_when_command_errors():
+    full_command = ['foo', 'bar']
+    expected_output = '[]'
+    flexmock(module.os, environ={'a': 'b'})
+    flexmock(module.subprocess).should_receive('check_output').with_args(
+        full_command, stderr=None, shell=False, env=None, cwd=None
+    ).and_raise(subprocess.CalledProcessError(2, full_command, expected_output)).once()
+    flexmock(module).should_receive('exit_code_indicates_error').and_return(True).once()
+
+    with pytest.raises(subprocess.CalledProcessError):
+        module.execute_command_and_capture_output(full_command)
+
+
 def test_execute_command_and_capture_output_returns_output_with_shell():
     full_command = ['foo', 'bar']
     expected_output = '[]'