[FIX] core: disable werkzeug log color when logging to file

Werkzeug 1.0 colorised some outputs on POSIX IFF `click` was
installed.

Since 2.0 (pallets/werkzeug#2012) werkzeug unconditionally colorises
the log on POSIX. This is annoying when using output redirection (let
alone logging to a non-stream), as werkzeug will dump ANSI color codes
to the non-term stdout and thus the logfile.

Werkzeug provides no official knob to control this behaviour, but it
does have a secret flag which is normally used to check if colorama is
available on windows (so the ANSI codes are not output if colorama
won't be interpreting and stripping them on the way out). Since
`werkzeug.serving` is available in pretty much all versions, we can
just (un)set this flag if not logging to a tty, and versions 2+ should
pick it up and disable colorisation.

closes odoo/odoo#112829

X-original-commit: 7c9f883dc508a7a8a45bf7bf7e900da0be9b34be
Signed-off-by: Christophe Monniez (moc) <moc@odoo.com>
Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>

odoo/netsvc.py

@@ -12,6 +12,8 @@ import time
 import traceback
 import warnings
 
+import werkzeug.serving
+
 from . import release
 from . import sql_db
 from . import tools
@@ -207,6 +209,7 @@ def init_logger():
     else:
         formatter = DBFormatter(format)
         perf_filter = PerfFilter()
+        werkzeug.serving._log_add_style = False
     handler.setFormatter(formatter)
     logging.getLogger().addHandler(handler)
     logging.getLogger('werkzeug').addFilter(perf_filter)