minio/cmd/main.go
kannappanr d32f90fe95 Honor global flags irrespective of the position. (#5486)
Flags like `json, config-dir, quiet` are now honored even if they are
between minio and gateway in the cli, like, `minio --json gateway s3`.

Fixes #5403
2018-02-28 20:13:33 -08:00

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/*
* Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 Minio, Inc.
*
* 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 cmd
import (
"os"
"path/filepath"
"sort"
"github.com/minio/cli"
"github.com/minio/mc/pkg/console"
"github.com/minio/minio/pkg/trie"
"github.com/minio/minio/pkg/words"
)
// global flags for minio.
var globalFlags = []cli.Flag{
cli.StringFlag{
Name: "config-dir, C",
Value: getConfigDir(),
Usage: func() string {
usage := "Path to configuration directory."
if getConfigDir() == "" {
usage = usage + " This option must be set."
}
return usage
}(),
},
cli.BoolFlag{
Name: "quiet",
Usage: "Disable startup information.",
},
cli.BoolFlag{
Name: "json",
Usage: "Output server logs and startup information in json format.",
},
}
// Help template for minio.
var minioHelpTemplate = `NAME:
{{.Name}} - {{.Usage}}
DESCRIPTION:
{{.Description}}
USAGE:
{{.HelpName}} {{if .VisibleFlags}}[FLAGS] {{end}}COMMAND{{if .VisibleFlags}}{{end}} [ARGS...]
COMMANDS:
{{range .VisibleCommands}}{{join .Names ", "}}{{ "\t" }}{{.Usage}}
{{end}}{{if .VisibleFlags}}
FLAGS:
{{range .VisibleFlags}}{{.}}
{{end}}{{end}}
VERSION:
` + Version +
`{{ "\n"}}`
func newApp(name string) *cli.App {
// Collection of minio commands currently supported are.
commands := []cli.Command{}
// Collection of minio commands currently supported in a trie tree.
commandsTree := trie.NewTrie()
// registerCommand registers a cli command.
registerCommand := func(command cli.Command) {
commands = append(commands, command)
commandsTree.Insert(command.Name)
}
findClosestCommands := func(command string) []string {
var closestCommands []string
for _, value := range commandsTree.PrefixMatch(command) {
closestCommands = append(closestCommands, value.(string))
}
sort.Strings(closestCommands)
// Suggest other close commands - allow missed, wrongly added and
// even transposed characters
for _, value := range commandsTree.Walk(commandsTree.Root()) {
if sort.SearchStrings(closestCommands, value.(string)) < len(closestCommands) {
continue
}
// 2 is arbitrary and represents the max
// allowed number of typed errors
if words.DamerauLevenshteinDistance(command, value.(string)) < 2 {
closestCommands = append(closestCommands, value.(string))
}
}
return closestCommands
}
// Register all commands.
registerCommand(serverCmd)
registerCommand(gatewayCmd)
registerCommand(updateCmd)
registerCommand(versionCmd)
// Set up app.
cli.HelpFlag = cli.BoolFlag{
Name: "help, h",
Usage: "Show help.",
}
app := cli.NewApp()
app.Name = name
app.Author = "Minio.io"
app.Version = Version
app.Usage = "Cloud Storage Server."
app.Description = `Minio is an Amazon S3 compatible object storage server. Use it to store photos, videos, VMs, containers, log files, or any blob of data as objects.`
app.Flags = globalFlags
app.HideVersion = true // Hide `--version` flag, we already have `minio version`.
app.HideHelpCommand = true // Hide `help, h` command, we already have `minio --help`.
app.Commands = commands
app.CustomAppHelpTemplate = minioHelpTemplate
app.CommandNotFound = func(ctx *cli.Context, command string) {
console.Printf("%s is not a minio sub-command. See minio --help.\n", command)
closestCommands := findClosestCommands(command)
if len(closestCommands) > 0 {
console.Println()
console.Println("Did you mean one of these?")
for _, cmd := range closestCommands {
console.Printf("\t%s\n", cmd)
}
}
os.Exit(1)
}
return app
}
// Main main for minio server.
func Main(args []string) {
// Set the minio app name.
appName := filepath.Base(args[0])
// Run the app - exit on error.
if err := newApp(appName).Run(args); err != nil {
os.Exit(1)
}
}