Configuration file supports FHS specification, /etc/srs/srs.conf

[purplegrape]

Suggest referring to the FHS (Filesystem Hierarchy Standard) directory standard and setting the default configuration file to /etc/srs/srs.conf. If the -c option is used to specify a configuration file, it will take precedence. (I am not a programmer, please forgive me)

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[winlinvip]

@purplegrape Thanks a lot

I make a little change and merge as 1f4dad0

However, I still prioritize local configuration. First, I look for the configuration specified by the user, then I look for the default conf/srs.conf, and finally, I look for /etc/srs/srs.conf.

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[purplegrape]

Suggest putting the default configuration in the compilation parameters, as there are many parameters involved, which is a sign of software maturity in accordance with FHS.

Refer to the compilation parameters of nginx.
--prefix=/usr/share/nginx
--conf-path=/etc/nginx/nginx.conf
--error-log-path=/var/log/nginx/error.log
--pid-path=/run/nginx.pid

In addition, it is more refreshing to start without any parameters by default, and it is also recommended to refer to nginx, which is equivalent to -c /etc/xx.conf.

Finally, it is not recommended for software to be designed for multiple local instances from the beginning. Simply copying the parent directory and changing the configuration file port can generate a new instance. This is a lazy approach. Multiple instances should be specified by different configuration files, and the paths should be written within the configuration files.

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[winlinvip]

Currently, when the SRS is configured in a way that does not match the user-specified configuration file, it will print a warning and provide the used configuration file:

$ ./objs/srs
[2021-12-22 13:08:58.706][Trace][95002][d81x10st] XCORE-SRS/4.0.207(Leo)
[2021-12-22 13:08:58.707][Warn][95002][d81x10st][2] user config  does not exists, use conf/srs.conf instead

As well as the attempted configuration files that were not found:

$ ~/srs/objs/srs -c user/docker.conf
[2021-12-22 13:06:42.387][Trace][94789][20v73877] XCORE-SRS/4.0.207(Leo)
[2021-12-22 13:06:42.388][Error][94789][20v73877][2] Failed, code=1023 : config parse options : no config file at 
user/docker.conf, user/srs.conf, conf/srs.conf, /etc/srs/srs.conf
thread [94789][20v73877]: do_main() [src/main/srs_main_server.cpp:108][errno=2]
thread [94789][20v73877]: parse_options() [src/app/srs_app_config.cpp:2011][errno=2](No such file or directory)

Other suggestions, if you find them important, please submit a pull request (PR).

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