initial

.gitignore

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+**.sw*
+tmp
+ftp
+goftp

Dockerfile

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+FROM frolvlad/alpine-glibc:alpine-3.9_glibc-2.28 
+
+WORKDIR /opt
+COPY ./ftp /opt/ftp
+
+EXPOSE 42121
+
+CMD []
+ENTRYPOINT ["/opt/ftp", "-root", "/mnt", "-host", "", "-port", "42121"]

main.go

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+// Copyright 2018 The goftp Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+// This is a very simple ftpd server using this library as an example
+// and as something to run tests against.
+package main
+
+import (
+	"flag"
+	"log"
+
+	filedriver "github.com/goftp/file-driver"
+	"github.com/goftp/server"
+)
+
+func main() {
+	var (
+		root = flag.String("root", "", "Root directory to serve")
+		user = flag.String("user", "admin", "Username for login")
+		pass = flag.String("pass", "123456", "Password for login")
+		port = flag.Int("port", 2121, "Port")
+		host = flag.String("host", "localhost", "Port")
+	)
+	flag.Parse()
+	if *root == "" {
+		log.Fatalf("Please set a root to serve with -root")
+	}
+
+	factory := &filedriver.FileDriverFactory{
+		RootPath: *root,
+		Perm:     server.NewSimplePerm("user", "group"),
+	}
+
+	opts := &server.ServerOpts{
+		Factory:  factory,
+		Port:     *port,
+		Hostname: *host,
+		Auth:     &server.SimpleAuth{Name: *user, Password: *pass},
+	}
+
+	log.Printf("Starting ftp server on %v:%v", opts.Hostname, opts.Port)
+	log.Printf("Username %v, Password %v", *user, *pass)
+	server := server.NewServer(opts)
+	err := server.ListenAndServe()
+	if err != nil {
+		log.Fatal("Error starting server:", err)
+	}
+}