前言
cli is a simple, fast, and fun package for building command line apps in Go.官网
例子1
package main
import (
"log"
"os"
"time"
"github.com/urfave/cli"
)
func main() {
log.Printf("Main start!\n")
app := cli.NewApp()
app.Name = "example"
app.Usage = "make an explosive entrance"
app.Action = func(c *cli.Context) error {
log.Printf("args:%s\n", c.Args())
for i := 0; i < 5; i++ {
log.Printf("sleep %d\n", i)
time.Sleep(1 * time.Second)
}
return nil
}
log.Printf("Before invoking Run!\n")
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
log.Printf("Main end!\n")
}
go run test01.go args01 args02
运行结果:
2019/03/24 18:41:58 Main start!
2019/03/24 18:41:58 Before invoking Run!
2019/03/24 18:41:58 args:[args01 args02]
2019/03/24 18:41:58 sleep 0
2019/03/24 18:41:59 sleep 1
2019/03/24 18:42:00 sleep 2
2019/03/24 18:42:01 sleep 3
2019/03/24 18:42:02 sleep 4
2019/03/24 18:42:03 Main end!
可以看到
app.Run(os.Args)是会阻塞的.
例子2
加入
Flag
package main
import (
"log"
"os"
"time"
"github.com/urfave/cli"
)
func main() {
log.Printf("Main start!\n")
app := cli.NewApp()
app.Name = "example"
app.Usage = "make an explosive entrance"
app.Flags = []cli.Flag {
cli.BoolFlag{
Name: "flag",
Usage: "enable tty",
},
cli.StringFlag{
Name: "lang",
Value: "english",
},
}
app.Action = func(c *cli.Context) error {
log.Printf("args:%s\n", c.Args())
log.Printf("flag:%v\n", c.Bool("flag"))
log.Printf("lang:%s\n", c.String("lang"))
for i := 0; i < 5; i++ {
log.Printf("sleep %d\n", i)
time.Sleep(1 * time.Second)
}
return nil
}
log.Printf("Before invoking Run!\n")
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
log.Printf("Main end!\n")
}
go run test02.go -flag -lang chinese args01 args02
2019/03/24 19:30:13 Main start!
2019/03/24 19:30:13 Before invoking Run!
2019/03/24 19:30:13 args:[args01 args02]
2019/03/24 19:30:13 flag:true
2019/03/24 19:30:13 lang:chinese
2019/03/24 19:30:13 sleep 0
2019/03/24 19:30:14 sleep 1
2019/03/24 19:30:15 sleep 2
2019/03/24 19:30:16 sleep 3
2019/03/24 19:30:17 sleep 4
2019/03/24 19:30:18 Main end!
例子3
加入
Command
package main
import (
"log"
"os"
"time"
"github.com/urfave/cli"
)
func main() {
log.Printf("Main start!\n")
app := cli.NewApp()
app.Name = "example"
app.Usage = "make an explosive entrance"
runCommand := cli.Command{
Name: "run",
Flags: []cli.Flag{
cli.BoolFlag{
Name: "it",
Usage: "enable tty",
},
},
Action: func(c *cli.Context) error {
log.Printf("runcommand args:%s\n", c.Args())
log.Printf("runcommand tty:%v\n", c.Bool("it"))
for i := 0; i < 5; i++ {
log.Printf("runcommand sleep %d\n", i)
time.Sleep(1 * time.Second)
}
return nil
},
}
app.Commands = []cli.Command {
runCommand,
}
app.Action = func(c *cli.Context) error {
log.Printf("main function args:%s\n", c.Args())
for i := 0; i < 5; i++ {
log.Printf("main function sleep %d\n", i)
time.Sleep(1 * time.Second)
}
return nil
}
log.Printf("Before invoking Run!\n")
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
log.Printf("Main end!\n")
}
go run test03.go run -it arg01 arg02
2019/03/24 19:45:50 Main start!
2019/03/24 19:45:50 Before invoking Run!
2019/03/24 19:45:50 runcommand args:[arg01 arg02]
2019/03/24 19:45:50 runcommand tty:true
2019/03/24 19:45:50 runcommand sleep 0
2019/03/24 19:45:51 runcommand sleep 1
2019/03/24 19:45:52 runcommand sleep 2
2019/03/24 19:45:53 runcommand sleep 3
2019/03/24 19:45:54 runcommand sleep 4
2019/03/24 19:45:55 Main end!
参考
全部内容
mydocker.png
1. [mydocker]---环境说明
2. [mydocker]---urfave cli 理解
3. [mydocker]---Linux Namespace
4. [mydocker]---Linux Cgroup
5. [mydocker]---构造容器01-实现run命令
6. [mydocker]---构造容器02-实现资源限制01
7. [mydocker]---构造容器02-实现资源限制02
8. [mydocker]---构造容器03-实现增加管道
9. [mydocker]---通过例子理解存储驱动AUFS
10. [mydocker]---通过例子理解chroot 和 pivot_root
11. [mydocker]---一步步实现使用busybox创建容器
12. [mydocker]---一步步实现使用AUFS包装busybox
13. [mydocker]---一步步实现volume操作
14. [mydocker]---实现保存镜像
15. [mydocker]---实现容器的后台运行
16. [mydocker]---实现查看运行中容器
17. [mydocker]---实现查看容器日志
18. [mydocker]---实现进入容器Namespace
19. [mydocker]---实现停止容器
20. [mydocker]---实现删除容器
21. [mydocker]---实现容器层隔离
22. [mydocker]---实现通过容器制作镜像
23. [mydocker]---实现cp操作
24. [mydocker]---实现容器指定环境变量
25. [mydocker]---网际协议IP
26. [mydocker]---网络虚拟设备veth bridge iptables
27. [mydocker]---docker的四种网络模型与原理实现(1)
28. [mydocker]---docker的四种网络模型与原理实现(2)
29. [mydocker]---容器地址分配
30. [mydocker]---网络net/netlink api 使用解析
31. [mydocker]---网络实现
32. [mydocker]---网络实现测试
