new option for log-file

borgmatic/commands/arguments.py

@@ -148,6 +148,12 @@ def parse_arguments(*unparsed_arguments):
         default=0,
         help='Display verbose progress to syslog (from none to lots: 0, 1, or 2). Ignored when console is interactive',
     )
+    global_group.add_argument(
+        '--log-file',
+        type=str,
+        default=None,
+        help='Write log messages to this file instead of concole and syslog',
+    )
     global_group.add_argument(
         '--version',
         dest='version',

borgmatic/commands/borgmatic.py

@@ -433,6 +433,7 @@ def main():  # pragma: no cover
     configure_logging(
         verbosity_to_log_level(global_arguments.verbosity),
         verbosity_to_log_level(global_arguments.syslog_verbosity),
+        global_arguments.log_file,
     )
 
     logger.debug('Ensuring legacy configuration is upgraded')

borgmatic/logger.py

@@ -73,15 +73,19 @@ def color_text(color, message):
     return '{}{}{}'.format(color, message, colorama.Style.RESET_ALL)
 
 
-def configure_logging(console_log_level, syslog_log_level=None):
+def configure_logging(console_log_level, syslog_log_level=None, log_file=None):
     '''
     Configure logging to go to both the console and syslog. Use the given log levels, respectively.
     '''
     if syslog_log_level is None:
         syslog_log_level = console_log_level
 
+    if log_file is None:
         console_handler = logging.StreamHandler()
         console_handler.setFormatter(Console_color_formatter())
+    else:
+        console_handler = logging.FileHandler(log_file)
+        console_handler.setFormatter(logging.Formatter('[%(asctime)s] %(levelname)s: %(message)s'))
     console_handler.setLevel(console_log_level)
 
     syslog_path = None
@@ -90,7 +94,7 @@ def configure_logging(console_log_level, syslog_log_level=None):
     elif os.path.exists('/var/run/syslog'):
         syslog_path = '/var/run/syslog'
 
-    if syslog_path and not interactive_console():
+    if syslog_path and not interactive_console() and log_file is None:
         syslog_handler = logging.handlers.SysLogHandler(address=syslog_path)
         syslog_handler.setFormatter(logging.Formatter('borgmatic: %(levelname)s %(message)s'))
         syslog_handler.setLevel(syslog_log_level)