Go Language learning Tips (ii)

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Golang compile-time set version number

No matter what language you write the code in, the version is a very important thing. In general, it is a good idea to use the-V or--version parameters to output the version of the program. Words do not say much, on the code snippet.

package mainimport (    "flag"    "fmt"    "os")var VersionStr = "unknown"func main() {    version := flag.Bool("v", false, "Show Version")    flag.Parse()    if *version {        fmt.Println(VersionStr)        os.Exit(0)    }}

Compile script:

#!/bin/bash -xefunction getversion() {    branch=`git rev-parse --abbrev-ref HEAD`    commitid=`git rev-parse --short HEAD`    builddate=`date +%Y%m%d-%H%M%S`    echo $branch-$commitid-$builddate}cd `dirname $0`# use go vendorexport GO15VENDOREXPERIMENT=1version=`getversion`pkgpath="github.com/auxten/logrus/examples/basic"echo "build log-linux"GOOS=linux GOARCH=amd64  go build -ldflags "-X main.VersionStr=${version}"  -o bin/log-linux ${pkgpath}#echo "build log-osx"#GOOS=darwin GOARCH=amd64 go build -ldflags "-X main.VersionStr=${version}"  -o bin/log-osx ${pkgpath}#echo "build log-win#GOOS=windows GOARCH=386  go build -ldflags "-X main.versionStr=${version}"  -o bin/log-win ${pkgpath}echo "done"

This way, you can put the GIT branch-commitid-compile time output by running./bin/log-linux-v.

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