Add mkfifo command.

CHANGELOG.md

@@ -1,7 +1,8 @@
 # Changelog
 All notable changes to this project will be documented in this file. The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
-## [0.5.1] - 2021-11-18
+## [0.6.0] - 2021-11-18
 ### Added
+ - mkfifo command.
  - rm command.
  - rmdir command.
 ### Changed

README.md

@@ -24,6 +24,7 @@ $ sudo ./installer.sh
 |  ischroot| Detect if running in a chroot|
 |     mbsh | Mimix Box Shell (In development)|
 |    mkdir | Make directories|
+|    mkfifo | Make FIFO (Named pipe)|
 |       mv | Rename SOURCE to DESTINATION, or move SOURCE(s) to DIRECTORY|
 |     path | Manipulate filename path|
 |     rm   | Remove file(s) or directory(s)|

cmd/mimixbox/main.go

@@ -50,7 +50,7 @@ type options struct {
 
 var osExit = os.Exit
 
-const version = "0.5.1"
+const version = "0.6.0"
 
 const (
 	ExitSuccess int = iota // 0

docs/man/mimixbox/en/mimixbox.1.md

@@ -20,7 +20,7 @@ commands.
 
 # Command（applet）list
 **Common unix commands（applets）**  
-cat, chroot, echo, false, ischroot, mkdir, mv, rm, rmdir, touch, true, which
+cat, chroot, echo, false, ischroot, mkdir, mkfifo, mv, rm, rmdir, touch, true, which
 
 **MimixBox Original commands（applets）**  
 fakemovie, ghrdc, mbsh(sh), path, serial

docs/man/mimixbox/ja/mimixbox.1.md

@@ -18,7 +18,7 @@ Coreutils等が提供する基本的な内容から実験的なコマンドま
 
 # コマンド（applet）一覧
 **一般的なUnixコマンド（applet）**  
-cat, chroot, echo, false, ischroot, mkdir, mv, rm, rmdir, touch, true, which
+cat, chroot, echo, false, ischroot, mkdir, mkfifo, mv, rm, rmdir, touch, true, which
 
 **MimixBoxオリジナルコマンド（applet）**  
 fakemovie, ghrdc, mbsh(sh), path, serial

internal/applets/applet.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"go/doc"
 	"mimixbox/internal/applets/fileutils/mkdir"
+	"mimixbox/internal/applets/fileutils/mkfifo"
 	"mimixbox/internal/applets/fileutils/mv"
 	"mimixbox/internal/applets/fileutils/rm"
 	"mimixbox/internal/applets/fileutils/rmdir"
@@ -61,6 +62,7 @@ func init() {
 		"ischroot":  {ischroot.Run, "Detect if running in a chroot"},
 		"mbsh":      {mbsh.Run, "Mimix Box Shell"},
 		"mkdir":     {mkdir.Run, "Make directories"},
+		"mkfifo":    {mkfifo.Run, "Make FIFO (named pipe)"},
 		"mv":        {mv.Run, "Rename SOURCE to DESTINATION, or move SOURCE(s) to DIRECTORY"},
 		"path":      {path.Run, "Manipulate filename path"},
 		"rm":        {rm.Run, "Remove file(s) or directory(s)"},

internal/applets/fileutils/mkfifo/mkfifo.go

@@ -0,0 +1,107 @@
+//
+// mimixbox/internal/applets/fileutils/mkfifo/mkfifo.go
+//
+// Copyright 2021 Naohiro CHIKAMATSU
+//
+// 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 mkfifo
+
+import (
+	"errors"
+	"fmt"
+	mb "mimixbox/internal/lib"
+	"os"
+	"syscall"
+
+	"github.com/jessevdk/go-flags"
+)
+
+const cmdName string = "mkfifo"
+
+const version = "1.0.0"
+
+var osExit = os.Exit
+
+// Exit code
+const (
+	ExitSuccess int = iota // 0
+	ExitFailuer
+)
+
+type options struct {
+	Version bool `short:"v" long:"version" description:"Show mkfifo command version"`
+}
+
+func Run() (int, error) {
+	var opts options
+	var args []string
+	var err error
+	var status int
+
+	if args, err = parseArgs(&opts); err != nil {
+		return ExitFailuer, nil
+	}
+
+	// If an error occurs even once, the process is interrupted.
+	// It behaves differently from Coreutils.
+	for _, path := range args {
+		if mb.Exists(path) {
+			return ExitFailuer, errors.New("Can't make " + path + ": already exist")
+		}
+		if err := syscall.Mkfifo(path, 0666); err != nil {
+			return ExitFailuer, err
+		}
+	}
+	return status, nil
+}
+
+func parseArgs(opts *options) ([]string, error) {
+	p := initParser(opts)
+
+	args, err := p.Parse()
+	if err != nil {
+		return nil, err
+	}
+
+	if opts.Version {
+		showVersion()
+		osExit(ExitSuccess)
+	}
+
+	if !isValidArgNr(args) {
+		showHelp(p)
+		osExit(ExitFailuer)
+	}
+	return args, nil
+}
+
+func initParser(opts *options) *flags.Parser {
+	parser := flags.NewParser(opts, flags.Default)
+	parser.Name = cmdName
+	parser.Usage = "[OPTIONS] FILE_PATH"
+
+	return parser
+}
+
+func isValidArgNr(args []string) bool {
+	return len(args) >= 1
+}
+
+func showVersion() {
+	description := cmdName + " version " + version + " (under Apache License verison 2.0)\n"
+	fmt.Print(description)
+}
+
+func showHelp(p *flags.Parser) {
+	p.WriteHelp(os.Stdout)
+}