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

cli/common/flags.go

@@ -0,0 +1,61 @@
+// Copyright 2021 Woodpecker Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package common
+
+import "github.com/urfave/cli/v2"
+
+var GlobalFlags = []cli.Flag{
+	&cli.StringFlag{
+		EnvVars: []string{"WOODPECKER_TOKEN"},
+		Name:    "token",
+		Aliases: []string{"t"},
+		Usage:   "server auth token",
+	},
+	&cli.StringFlag{
+		EnvVars: []string{"WOODPECKER_SERVER"},
+		Name:    "server",
+		Aliases: []string{"s"},
+		Usage:   "server address",
+	},
+	&cli.BoolFlag{
+		EnvVars: []string{"WOODPECKER_SKIP_VERIFY"},
+		Name:    "skip-verify",
+		Usage:   "skip ssl verification",
+		Hidden:  true,
+	},
+	&cli.StringFlag{
+		EnvVars: []string{"SOCKS_PROXY"},
+		Name:    "socks-proxy",
+		Usage:   "socks proxy address",
+		Hidden:  true,
+	},
+	&cli.BoolFlag{
+		EnvVars: []string{"SOCKS_PROXY_OFF"},
+		Name:    "socks-proxy-off",
+		Usage:   "socks proxy ignored",
+		Hidden:  true,
+	},
+}
+
+// FormatFlag return format flag with value set based on template
+// if hidden value is set, flag will be hidden
+func FormatFlag(tmpl string, hidden ...bool) *cli.StringFlag {
+	return &cli.StringFlag{
+		Name:   "format",
+		Usage:  "format output",
+		Value:  tmpl,
+		Hidden: len(hidden) != 0,
+	}
+}