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imageCreator.go
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imageCreator.go
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package main
import (
"bytes"
"errors"
"flag"
"fmt"
"io"
"os"
"os/exec"
"os/user"
"path"
"runtime"
"strconv"
"strings"
"time"
)
var dockerfile = `FROM mxpan/alpine-arm:1.0
`
var cmdArgDesr = `
Usage imageCreator [OPTIONS]
Options:
-t: docker image 'name:tag' format (default [])
-f: file absoulte path
`
func checkFileIsExist(filename string) bool {
var exist = true
if _, err := os.Stat(filename); os.IsNotExist(err) {
exist = false
}
return exist
}
// Home returns the home directory for the executing user.
//
// This uses an OS-specific method for discovering the home directory.
// An error is returned if a home directory cannot be detected.
func Home() (string, error) {
user, err := user.Current()
if nil == err {
return user.HomeDir, nil
}
// cross compile support
if "windows" == runtime.GOOS {
return homeWindows()
}
// Unix-like system, so just assume Unix
return homeUnix()
}
func homeUnix() (string, error) {
// First prefer the HOME environmental variable
if home := os.Getenv("HOME"); home != "" {
return home, nil
}
// If that fails, try the shell
var stdout bytes.Buffer
cmd := exec.Command("sh", "-c", "eval echo ~$USER")
cmd.Stdout = &stdout
if err := cmd.Run(); err != nil {
return "", err
}
result := strings.TrimSpace(stdout.String())
if result == "" {
return "", errors.New("blank output when reading home directory")
}
return result, nil
}
func homeWindows() (string, error) {
drive := os.Getenv("HOMEDRIVE")
path := os.Getenv("HOMEPATH")
home := drive + path
if drive == "" || path == "" {
home = os.Getenv("USERPROFILE")
}
if home == "" {
return "", errors.New("HOMEDRIVE, HOMEPATH, and USERPROFILE are blank")
}
return home, nil
}
func CopyFile(dstName, srcName string) (written int64, err error) {
src, err := os.Open(srcName)
if err != nil {
return
}
defer src.Close()
dst, err := os.OpenFile(dstName, os.O_WRONLY|os.O_CREATE, 0777)
if err != nil {
return
}
defer dst.Close()
return io.Copy(dst, src)
}
func createDockerFolder() (folder string, err error) {
homePath, err := Home()
//fmt.Println(homePath)
if runtime.GOOS == "windows" {
if err != nil {
folder = "C:\\Users\\dell\\AppData\\Local\\images" + strconv.Itoa(time.Now().Nanosecond())
} else {
folder = homePath + "\\AppData\\Local\\images" + strconv.Itoa(time.Now().Nanosecond())
}
} else {
folder = "/usr/local/images" + strconv.Itoa(time.Now().Nanosecond())
}
err = os.MkdirAll(folder, os.ModePerm)
if err != nil {
fmt.Println("Create file folder error: ", err.Error())
return
}
return folder, err
}
func genDockerfile(filePath string, progName string) (err error) {
f, err := os.Create(filePath)
if err != nil {
fmt.Println("Create file error: ", err.Error())
return
}
defer f.Close()
f.WriteString(dockerfile)
f.WriteString("COPY ./" + progName + " /home/\n")
f.WriteString("ENTRYPOINT [\"/home/" + progName + "\"]\n")
f.Sync()
return err
}
func main() {
imgTag := flag.String("t", "", "docker image 'name:tag' format (default [])")
progPath := flag.String("f", "", "file absoule path")
flag.Parse()
//fmt.Println(*imgTag, *progPath)
if *imgTag == "" || *progPath == "" {
fmt.Println(cmdArgDesr)
return
}
if !checkFileIsExist(*progPath) {
fmt.Println("file %s not exist, please check")
return
}
progName := path.Base(*progPath)
//fmt.Println(progName)
cmd := exec.Command("docker", "info")
out, err := cmd.CombinedOutput()
if err != nil {
fmt.Println("Please check whether or not the docker has run 0x0001: ", err.Error())
return
} else {
strOut := string(out)
if !strings.Contains(strOut, "Server") {
fmt.Println("Please check whether or not the docker has run 0x0002: ", string(out))
return
}
}
fileFolder, err := createDockerFolder()
if err != nil {
return
}
defer os.RemoveAll(fileFolder)
var dockerFilePath = fileFolder + "/" + "Dockerfile"
err = genDockerfile(dockerFilePath, progName)
if err != nil {
return
}
_, err = CopyFile(fileFolder+"/"+progName, *progPath)
if err != nil {
fmt.Println(err.Error())
return
}
cmd = exec.Command("docker", "build", "-t", *imgTag, "-f", dockerFilePath, fileFolder)
out, err = cmd.CombinedOutput()
if err != nil {
fmt.Println("docker image build error: ", err.Error())
return
}
tags := strings.Split(*imgTag, ":")
//fmt.Println(tags)
if len(tags) > 0 {
//fmt.Println(tags[0])
cmdArgs := "docker images | grep " + tags[0]
cmd = exec.Command("bash", "-c", cmdArgs)
out, err = cmd.CombinedOutput()
if err != nil {
fmt.Println("docker image result: ", err.Error())
} else {
strOut := string(out)
fmt.Println(strOut)
}
}
fmt.Println("docker image build finish")
}