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@mattkasun
Created October 28, 2021 13:21
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Version info for app
Here's a simple example, hopefully it would clarify and help how to do it easily:
Create a directory for your application:
$ mkdir app && cd app
Create a sub directory config:
$ mkdir config
Add the following file. it should be under app/config/vars.go:
package config
var Version string
var BuildTime string
//todo: can add as many as build vars
In the root app/, add main package main.go:
package main
import (
"fmt"
"app/config"
)
func main() {
fmt.Println("build.Version:\t", Version)
fmt.Println("build.Time:\t", build.BuildTime)
}
Now it is time to build:
go build -ldflags "-X 'app/config.Version=0.0.1' -X 'app/config.BuildTime=$(date)'"
Once it's built, you can run now the app:
$ ./app
Version: 0.0.1
build.Time: Sat Jul 4 19:49:19 UTC 2020
Finally, you may need sometimes to explore what does specific app you didn't code yourself provide in ldflags, you can do this by using nm that comes with go tool to list all ldflags.
Just build the app then use go tool nm to list all linker flags.
$ go build -o app
$ go tool nm ./app
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