log file under public/shared tmp/ folders must not have deterministic name #1575

docs/config.rst

@@ -115,15 +115,10 @@ Glances logs all of its internal messages to a log file.
 ``DEBUG`` messages can been logged using the ``-d`` option on the command
 line.
 
-By default, the ``glances-USERNAME.log`` file is under the temporary directory:
+The location of the Glances depends of your operating system. You could
+displayed the Glances log file full path using the``glances -V`` command line.
 
-=========== ======
-``*nix``    /tmp
-``Windows`` %TEMP%
-=========== ======
-
-- On Windows XP, ``%TEMP%`` is: ``C:\Documents and Settings\<USERNAME>\Local Settings\Temp``.
-- On Windows Vista and later: ``C:\Users\<USERNAME>\AppData\Local\Temp``.
+The file is automatically rotate when the size is higher than 1 MB.
 
 If you want to use another system path or change the log message, you
 can use your own logger configuration. First of all, you have to create

docs/man/glances.1

@@ -1,6 +1,6 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "GLANCES" "1" "Nov 24, 2019" "3.1.4_BETA" "Glances"
+.TH "GLANCES" "1" "Dec 26, 2019" "3.1.4_BETA" "Glances"
 .SH NAME
 glances \- An eye on your system
 .
@@ -670,30 +670,10 @@ Glances logs all of its internal messages to a log file.
 \fBDEBUG\fP messages can been logged using the \fB\-d\fP option on the command
 line.
 .sp
-By default, the \fBglances\-USERNAME.log\fP file is under the temporary directory:
-.TS
-center;
-|l|l|.
-_
-T{
-\fB*nix\fP
-T}	T{
-/tmp
-T}
-_
-T{
-\fBWindows\fP
-T}	T{
-%TEMP%
-T}
-_
-.TE
-.INDENT 0.0
-.IP \(bu 2
-On Windows XP, \fB%TEMP%\fP is: \fBC:\eDocuments and Settings\e<USERNAME>\eLocal Settings\eTemp\fP\&.
-.IP \(bu 2
-On Windows Vista and later: \fBC:\eUsers\e<USERNAME>\eAppData\eLocal\eTemp\fP\&.
-.UNINDENT
+The location of the Glances depends of your operating system. You could
+displayed the Glances log file full path using the\(ga\(gaglances \-V\(ga\(ga command line.
+.sp
+The file is automatically rotate when the size is higher than 1 MB.
 .sp
 If you want to use another system path or change the log message, you
 can use your own logger configuration. First of all, you have to create

glances/logger.py

@@ -27,7 +27,26 @@ import tempfile
 import logging
 import logging.config
 
-LOG_FILENAME = os.path.join(tempfile.gettempdir(),
+from glances.globals import BSD, LINUX, MACOS, SUNOS, WINDOWS, WSL
+from glances.globals import safe_makedirs
+
+# Choose the good place for the log file (see issue #1575)
+# Default root path
+if 'HOME' in os.environ:
+    _XDG_CACHE_HOME = os.path.join(os.environ['HOME'], '.local', 'share')
+else:
+    _XDG_CACHE_HOME = ''
+# Define the glances log file
+if 'XDG_CACHE_HOME' in os.environ \
+        and os.path.isdir(os.environ['XDG_CACHE_HOME']) \
+        and os.access(os.environ['XDG_CACHE_HOME'], os.W_OK):
+    safe_makedirs(os.path.join(os.environ['XDG_CACHE_HOME'], 'glances'))
+    LOG_FILENAME = os.path.join(os.environ['XDG_CACHE_HOME'], 'glances', 'glances.log')
+elif os.path.isdir(_XDG_CACHE_HOME) and os.access(_XDG_CACHE_HOME, os.W_OK):
+    safe_makedirs(os.path.join(_XDG_CACHE_HOME, 'glances'))
+    LOG_FILENAME = os.path.join(_XDG_CACHE_HOME, 'glances', 'glances.log')
+else:
+    LOG_FILENAME = os.path.join(tempfile.gettempdir(),
                                 'glances-{}.log'.format(getpass.getuser()))
 
 # Define the logging configuration
@@ -56,6 +75,8 @@ LOGGING_CFG = {
         "file": {
             "level": "DEBUG",
             "class": "logging.handlers.RotatingFileHandler",
+            "maxBytes": 1000000,
+            "backupCount": 3,
             "formatter": "standard",
             "filename": LOG_FILENAME
         },

glances/main.py

@@ -27,7 +27,7 @@ from glances import __version__, psutil_version
 from glances.compat import input
 from glances.config import Config
 from glances.globals import WINDOWS
-from glances.logger import logger
+from glances.logger import logger, LOG_FILENAME
 
 
 def disable(class_name, var):
@@ -112,7 +112,7 @@ Examples of use:
 
     def init_args(self):
         """Init all the command line arguments."""
-        version = "Glances v" + __version__ + " with psutil v" + psutil_version
+        version = 'Glances v{} with PsUtil v{}\nLog file: {}'.format(__version__, psutil_version, LOG_FILENAME)
         parser = argparse.ArgumentParser(
             prog='glances',
             conflict_handler='resolve',