email, plinth.log: Write more information to syslog

sudo journalctl -b -o short-monotonic --no-pager -f

actions/email_server

@@ -6,11 +6,15 @@ import logging
 import os
 import sys
 
-logger = logging.getLogger(__name__)
+import plinth.log
 
 EXIT_SYNTAX = 10
 EXIT_PERM = 20
 
+# Set up logging
+plinth.log.pipe_to_syslog(to_stderr='tty')
+logger = logging.getLogger(os.path.basename(__file__))
+
 
 def reserved_for_root(fun):
     def wrapped(*args, **kwargs):
@@ -22,6 +26,10 @@ def reserved_for_root(fun):
 
 
 def main():
+    if not sys.stdin.isatty():
+        print('WARNING: Output will not be shown. Check syslog for logs',
+              file=sys.stderr)
+
     parser = argparse.ArgumentParser()
     group = parser.add_mutually_exclusive_group(required=True)
     group.add_argument('-i', nargs=2, dest='ipc')
@@ -32,7 +40,12 @@ def main():
     subcommand, arguments = next(generator)
 
     function = globals()['subcommand_' + subcommand]
-    function(*arguments)
+    try:
+        function(*arguments)
+    except Exception as e:
+        logger.exception(e)
+        _log_additional_info()
+        sys.exit(1)
 
 
 @reserved_for_root
@@ -56,13 +69,25 @@ def subcommand_ipc(module_name, action_name):
 def subcommand_touch_file(path):
     import pathlib
 
-    if os.getuid == 0:
-        logger.critical('Do not run as root')
+    if os.getuid() == 0:
+        logger.critical('Do not run the `-t` option as root')
         sys.exit(EXIT_PERM)
 
     # mode is influenced by umask
     pathlib.Path(path).touch(mode=0o660, exist_ok=True)
 
 
+def _log_additional_info():
+    import grp
+    import pwd
+    resu = ','.join(pwd.getpwuid(uid).pw_name for uid in os.getresuid())
+    resg = ','.join(grp.getgrgid(gid).gr_name for gid in os.getresgid())
+    pyver = sys.version.replace('\n', ' ')
+    logger.error('--- Additional Information ---')
+    logger.error('resuid=%s, resgid=%s', resu, resg)
+    logger.error('argv=%r, cwd=%r', sys.argv, os.getcwd())
+    logger.error('pyver=%s (%s)', pyver, os.uname().machine)
+
+
 if __name__ == '__main__':
     main()

plinth/log.py

@@ -5,6 +5,8 @@ Setup logging for the application.
 
 import importlib
 import logging
+import logging.handlers
+import sys
 import warnings
 
 import cherrypy
@@ -127,3 +129,24 @@ def get_configuration():
         configuration['root']['handlers'].append('journal')
 
     return configuration
+
+
+def pipe_to_syslog(level=logging.INFO, to_stderr=True):
+    """Make the root logger write to syslog and stderr. Useful in actions"""
+    logger = logging.getLogger()
+    logger.setLevel(level)
+
+    fmt = '/freedombox/%(name)s[%(process)d]: %(levelname)s: %(message)s'
+    formatter = logging.Formatter(fmt=fmt)
+
+    # Using syslog in Python: https://stackoverflow.com/q/3968669
+    syslog_handler = logging.handlers.SysLogHandler(address='/dev/log')
+    syslog_handler.setFormatter(formatter)
+    logger.addHandler(syslog_handler)
+
+    if to_stderr == 'tty' and sys.stdin.isatty():
+        to_stderr = True
+    if to_stderr is True:
+        stderr_handler = logging.StreamHandler()
+        stderr_handler.setFormatter(formatter)
+        logger.addHandler(stderr_handler)