fix: [supervisord] environment section does not properly escape %%

[YUK1PEDIA]

Hi,
I encountered an issue with '%%' escaping failure when configuring environment variables in the supervisor configuration file.
My configuration file is as follows:

[unix_http_server]
file = /cnb/devsandbox/supervisor/supervisor.sock

[supervisorctl]
serverurl = unix:///cnb/devsandbox/supervisor/supervisor.sock

[supervisord]
pidfile     = /cnb/devsandbox/supervisor/supervisord.pid
logfile     = /cnb/devsandbox/supervisor/log/supervisord.log
interpolate = false
environment = 
SOURCE_FETCH_URL="http://ip:port/default/home/gotest2%%3Adefault%%3Amaster%%3Ac7c75432ebbdd32bd913fe8a05ae36eed9a5666c%%3Adev/tar?AWSAccessKeyId=example&Signature=example%%2FMFI8%%3D&Expires=1756347407",
other environment variables...

[rpcinterface:supervisor]
supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface

[program:scheduler]
command         = /cnb/process/scheduler
stdout_logfile  = /cnb/devsandbox/supervisor/log/scheduler.log
redirect_stderr = true

[program:web]
command         = /cnb/process/web
stdout_logfile  = /cnb/devsandbox/supervisor/log/web.log
redirect_stderr = true

[inet_http_server]
port = 127.0.0.1:9001

When I started the supervisor server using the configuration file above, the following error occurred:

Error: Format string 'SOURCE_FETCH_URL="http://ip:port/default/home/gotest2%%3Adefault%%3Amaster%%3Ac7c75432ebbdd32bd913fe8a05ae36eed9a5666c%%3Adev/tar?AWSAccessKeyId=example&Signature=example%%2FMFI8%%3D&Expires=1756347407",
other environment variables...' for 'environment' is badly formatted: unsupported format character 'A' (0x41) at index 3460

However, when I moved the environment from the [supervisord] section to the [program:***] section, the aforementioned error did not occur.

Later, while reviewing the code related to environment variable processing, I found that in supervisor/options.py:660, the % was expanded prematurely, causing %% to be interpreted as %. This value was then passed to expand(), which attempted to expand it again, resulting in the error.

Therefore, do_expand should be set to False at supervisor/options.py:660 to ensure proper escaping.

[mnaberez]

Thanks!