Upgrade urfave/cli to v2 (#483)

* migrate urfave/ci v1 -> v2
* refactor cli (format flag)
* log error if agent can not listen on port 3000

close #452

cmd/cli/main.go

@@ -20,9 +20,10 @@ import (
 	_ "github.com/joho/godotenv/autoload"
 	"github.com/rs/zerolog"
 	zlog "github.com/rs/zerolog/log"
-	"github.com/urfave/cli"
+	"github.com/urfave/cli/v2"
 
 	"github.com/woodpecker-ci/woodpecker/cli/build"
+	"github.com/woodpecker-ci/woodpecker/cli/common"
 	"github.com/woodpecker-ci/woodpecker/cli/deploy"
 	"github.com/woodpecker-ci/woodpecker/cli/exec"
 	"github.com/woodpecker-ci/woodpecker/cli/info"
@@ -42,40 +43,8 @@ func main() {
 	app.Version = version.String()
 	app.Usage = "command line utility"
 	app.EnableBashCompletion = true
-	app.Flags = []cli.Flag{
-		cli.StringFlag{
-			EnvVar: "WOODPECKER_TOKEN",
-			// TODO: rename to `token`
-			Name:  "t, token",
-			Usage: "server auth token",
-		},
-
-		cli.StringFlag{
-			EnvVar: "WOODPECKER_SERVER",
-			// TODO: rename to `server`
-			Name:  "s, server",
-			Usage: "server address",
-		},
-		cli.BoolFlag{
-			EnvVar: "WOODPECKER_SKIP_VERIFY",
-			Name:   "skip-verify",
-			Usage:  "skip ssl verification",
-			Hidden: true,
-		},
-		cli.StringFlag{
-			EnvVar: "SOCKS_PROXY",
-			Name:   "socks-proxy",
-			Usage:  "socks proxy address",
-			Hidden: true,
-		},
-		cli.BoolFlag{
-			EnvVar: "SOCKS_PROXY_OFF",
-			Name:   "socks-proxy-off",
-			Usage:  "socks proxy ignored",
-			Hidden: true,
-		},
-	}
-	app.Commands = []cli.Command{
+	app.Flags = common.GlobalFlags
+	app.Commands = []*cli.Command{
 		build.Command,
 		log.Command,
 		deploy.Command,