Default log location failes for non-root users

Any sub-command fails when executed as non-root user due to default
location being set to /var/log/paunch.log
Log location should be optional and specified by user.

Closes-bug: 1803421
Change-Id: I520add525efa7b7f959fb61aeb2053ef6a4085aa

paunch/cmd.py

@@ -20,7 +20,6 @@ import yaml
 
 import paunch
 
-from paunch import constants
 from paunch import utils
 
 
@@ -68,13 +67,8 @@ class Apply(command.Command):
         return parser
 
     def take_action(self, parsed_args):
-
-        # takes 1, or 2 if --verbose, or 4 - 5 if --debug
-        log_level = (self.app_args.verbose_level +
-                     int(self.app_args.debug) * 3)
-        log_file = self.app_args.log_file or constants.LOG_FILE
-        self.log = utils.common.configure_logging(
-            __name__, log_level, log_file)
+        (self.log, log_file, log_level) = \
+            utils.common.configure_logging_from_args(__name__, self.app_args)
         labels = collections.OrderedDict()
         for l in parsed_args.labels:
             k, v = l.split(('='), 1)
@@ -119,12 +113,8 @@ class Cleanup(command.Command):
         return parser
 
     def take_action(self, parsed_args):
-        # takes 1, or 2 if --verbose, or 4 - 5 if --debug
-        log_level = (self.app_args.verbose_level +
-                     int(self.app_args.debug) * 3)
-        log_file = self.app_args.log_file or constants.LOG_FILE
-        self.log = utils.common.configure_logging(
-            __name__, log_level, log_file)
+        (self.log, log_file, log_level) = \
+            utils.common.configure_logging_from_args(__name__, self.app_args)
         paunch.cleanup(
             parsed_args.config_id,
             managed_by=parsed_args.managed_by,
@@ -155,12 +145,8 @@ class Delete(command.Command):
         return parser
 
     def take_action(self, parsed_args):
-        # takes 1, or 2 if --verbose, or 4 - 5 if --debug
-        log_level = (self.app_args.verbose_level +
-                     int(self.app_args.debug) * 3)
-        log_file = self.app_args.log_file or constants.LOG_FILE
-        self.log = utils.common.configure_logging(
-            __name__, log_level, log_file)
+        (self.log, log_file, log_level) = \
+            utils.common.configure_logging_from_args(__name__, self.app_args)
         paunch.delete(
             parsed_args.config_id,
             parsed_args.managed_by,
@@ -253,14 +239,8 @@ class Debug(command.Command):
         return parser
 
     def take_action(self, parsed_args):
-
-        # takes 1, or 2 if --verbose, or 4 - 5 if --debug
-        log_level = (self.app_args.verbose_level +
-                     int(self.app_args.debug) * 3)
-        # Only log to a file if explicitely set via CLI args
-        log_file = self.app_args.log_file
-        self.log = utils.common.configure_logging(
-            __name__, log_level, log_file)
+        (self.log, log_file, log_level) = \
+            utils.common.configure_logging_from_args(__name__, self.app_args)
         labels = collections.OrderedDict()
         for l in parsed_args.labels:
             k, v = l.split(('='), 1)
@@ -323,12 +303,8 @@ class List(lister.Lister):
         return parser
 
     def take_action(self, parsed_args):
-        # takes 1, or 2 if --verbose, or 4 - 5 if --debug
-        log_level = (self.app_args.verbose_level +
-                     int(self.app_args.debug) * 3)
-        log_file = self.app_args.log_file or constants.LOG_FILE
-        self.log = utils.common.configure_logging(
-            __name__, log_level, log_file)
+        (self.log, log_file, log_level) = \
+            utils.common.configure_logging_from_args(__name__, self.app_args)
         configs = paunch.list(
             parsed_args.managed_by,
             log_level=log_level,

paunch/utils/common.py

@@ -14,8 +14,12 @@
 # under the License.
 
 import logging
+import os
 import sys
 
+from paunch import constants
+from paunch import utils
+
 
 def configure_logging(name, level=3, log_file=None):
     '''Mimic oslo_log default levels and formatting for the logger. '''
@@ -44,3 +48,19 @@ def configure_logging(name, level=3, log_file=None):
         log.propagate = False
 
     return log
+
+
+def configure_logging_from_args(name, app_args):
+    # takes 1, or 2 if --verbose, or 4 - 5 if --debug
+    log_level = (app_args.verbose_level +
+                 int(app_args.debug) * 3)
+
+    # if executed as root log to specified file or default log file
+    if os.getuid() == 0:
+        log_file = app_args.log_file or constants.LOG_FILE
+    else:
+        log_file = app_args.log_file
+
+    log = utils.common.configure_logging(
+        __name__, log_level, log_file)
+    return (log, log_file, log_level)