How do I set the log directory of glog from code

go glog
zhou lin picture zhou lin · Jan 29, 2015 · Viewed 10.6k times · Source

Does anyone know how to set/modify the log dir in the golang source code? I want to set the log dir in the soure code, instead of -log_dir= in the cmdline

Answer

RickyA picture RickyA · Jan 29, 2015

This is a hack I have seen lying around: set the flags in code. Also very good for setting log levels from code.

package main

import (
    "flag"

    "github.com/golang/glog"
)

func main() {
    flag.Parse()
    glog.Info("hi_a")
    flag.Lookup("logtostderr").Value.Set("true")
    glog.Info("hi_b")

    flag.Lookup("log_dir").Value.Set("/path/to/log/dir")

    glog.V(4).Info("v4a")
    flag.Lookup("v").Value.Set("10")
    glog.V(4).Info("v4b")
    //etc.    
}

>>> hi_b
>>> v4b

Related questions

glog flag redefined error

I am using glog flag log_dir in my project. Recently I imported kubernetes library and started getting this runtime panic panic: ./aaa.test flag redefined: log_dir May 16 23:51:35 ecmdev03-core01 docker[26867]: goroutine 1 [running]: May 16 23:51:35 ecmdev03-core01 docker[26867]: panic(0x15…

Read More
Can I set a global logging level in Glog?

In Java, which is the language in which I normally work, a common feature of logging libraries is the ability to set a "global" logging level - eg emit to the log file if the level is WARNING or above, …

Read More
How to check if a map contains a key in Go?

I know I can iterate over a map m by, for k, v := range m { ... } and look for a key but is there a more efficient way of testing a key's existence in a map? I couldn't find the answer …

Read More