not all command-line options seem to do anything

[bodiug]

I'm trying to disable registration with Consul using command-line but it's not being honored.

$ ./fabio-1.2.1-go1.7_linux-amd64 -registry.consul.register.enabled false
2016/08/31 12:50:57 [INFO] Runtime config
{
    "Proxy": {
        "Strategy": "rnd",
        "Matcher": "prefix",
        "NoRouteStatus": 404,
        "MaxConn": 10000,
        "ShutdownWait": 0,
        "DialTimeout": 30000000000,
        "ResponseHeaderTimeout": 0,
        "KeepAliveTimeout": 0,
        "ReadTimeout": 0,
        "WriteTimeout": 0,
        "FlushInterval": 1000000000,
        "LocalIP": "172.17.0.1",
        "ClientIPHeader": "",
        "TLSHeader": "",
        "TLSHeaderValue": ""
    },
    "Registry": {
        "Backend": "consul",
        "Static": {
            "Routes": ""
        },
        "File": {
            "Path": ""
        },
        "Consul": {
            "Addr": "localhost:8500",
            "Scheme": "http",
            "Token": "",
            "KVPath": "/fabio/config",
            "TagPrefix": "urlprefix-",
            "Register": true,
            "ServiceAddr": ":9998",
            "ServiceName": "fabio",
            "ServiceTags": null,
            "ServiceStatus": [
                "passing"
            ],
            "CheckInterval": 1000000000,
            "CheckTimeout": 3000000000
        }
    },
    "Listen": [
        {
            "Addr": ":9999",
            "Scheme": "http",
            "ReadTimeout": 0,
            "WriteTimeout": 0,
            "CertSource": {
                "Name": "",
                "Type": "",
                "CertPath": "",
                "KeyPath": "",
                "ClientCAPath": "",
                "CAUpgradeCN": "",
                "Refresh": 0,
                "Header": null
            }
        }
    ],
    "CertSources": {},
    "Metrics": {
        "Target": "",
        "Prefix": "default",
        "Interval": 30000000000,
        "GraphiteAddr": "",
        "StatsDAddr": ""
    },
    "UI": {
        "Addr": ":9998",
        "Color": "light-green",
        "Title": ""
    },
    "Runtime": {
        "GOGC": 800,
        "GOMAXPROCS": 4
    },
    "ListenerValue": [
        ":9999"
    ],
    "CertSourcesValue": null
}
2016/08/31 12:50:57 [INFO] Version 1.2.1 starting
2016/08/31 12:50:57 [INFO] Go runtime is go1.7
2016/08/31 12:50:57 [INFO] Setting GOGC=800
2016/08/31 12:50:57 [INFO] Setting GOMAXPROCS=4
2016/08/31 12:50:57 [INFO] Metrics disabled
2016/08/31 12:50:57 [FATAL] Error initializing backend. Get http://localhost:8500/v1/agent/self: dial tcp [::1]:8500: getsockopt: connection refused

Looking at the runtime config shown it's still showing "Register": true,. Possibly this is not working for other options as well? It becomes even weirder when I combine the disabling registration option with -ui.addr :8080, then it's also not being honored. But without it is being honored. Not sure what's going on there, hopefully an easy fix.

[bodiug]

Using -registry.consul.register.enabled=true does work. Is this behavior intended? You have to use = when using a boolean? -ui.addr :8080 works fine without =.

[magiconair]

This is the default behavior of the flag package.

https://golang.org/pkg/flag/#pkg-overview

Command line flag syntax:

-flag
-flag=x
-flag x  // non-boolean flags only

One or two minus signs may be used; they are equivalent. The last form is not permitted for boolean flags because the meaning of the command

cmd -x *

will change if there is a file called 0, false, etc. You must use the -flag=false form to turn off a boolean flag.

You must use the -flag=false form to turn off a boolean flag.

[bodiug]

Ah, I should've searched a little bit more. Thanks for clarifying and the prompt reply.

[magiconair]

No worries and please keep asking if something is not clear. You're probably not the only one who has this problem.