rakyll/statik でシングルバイナリにまとめる

$ go get github.com/rakyll/statik@latest
go: finding github.com/rakyll/statik v0.1.6
go: downloading github.com/rakyll/statik v0.1.6
go: extracting github.com/rakyll/statik v0.1.6

$ statik -h
Usage of statik:
  -Z	Do not use compression to shrink the files.
  -c string
    	The package comment. An empty value disables this comment.
    	 (default "Package statik contains static assets.")
  -dest string
    	The destination path of the generated package. (default ".")
  -f	Overwrite destination file if it already exists.
  -m	Ignore modification times on files.
  -p string
    	Name of the generated package (default "statik")
  -src string
    	The path of the source directory. (default "public")
  -tags string
    	Write build constraint tags

$ tree .
.
├── go.mod
├── html
│   └── index.html
└── sample.go

$ statik -src html

// Code generated by statik. DO NOT EDIT.

// Package statik contains static assets.
package statik

import (
	"github.com/rakyll/statik/fs"
)

func init() {
	data := "PK\x03\x04\x14\x00\x08\x00\x08\x00\x92=/O\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\n\x00	\x00index.htmlUT\x05\x00\x01\xe5\xeb}]\\\x8e1\xcb\xc2@\x0c@\xe7\xaf\xbf\xe2z\xf3W\x8a\x9bC\xae\x8b\nn:\x08\xe2\x18\xef\"\x0d\xa4w\xa5\x8d-\xfe{i\x0f\x1d\x9cB^\x1e\xe1A\xb9?\xed.\xb7\xf3\xc1\xb4\xdaIS\xc0g\x10\x86\xa6\xf8\x83\x8e\x14\x8doq\x18I\x9d}\xea\xa3\xda\xda/\x8f\xd8\x91\xb3\x13\xd3\xdc\xa7A\xad\xf1)*Euv\xe6\xa0\xad\x0b4\xb1\xa7j]\xfe\x0dGVF\xa9F\x8fBn\xb3~QV\xa1\xe6H\"\xc9\\\xd3 \xa1\x84:\xb3\x02\xea\x9c\x00\xf7\x14^\x8b\xdb\xffx\xfd\xe2\xe4#\xd4k\xf5;\x00\x00\xff\xffPK\x07\x08\x13\xf25U\x97\x00\x00\x00\xcc\x00\x00\x00PK\x01\x02\x14\x03\x14\x00\x08\x00\x08\x00\x92=/O\x13\xf25U\x97\x00\x00\x00\xcc\x00\x00\x00\n\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81\x00\x00\x00\x00index.htmlUT\x05\x00\x01\xe5\xeb}]PK\x05\x06\x00\x00\x00\x00\x01\x00\x01\x00A\x00\x00\x00\xd8\x00\x00\x00\x00\x00"
	fs.Register(data)
}

package main

import (
	"fmt"
	"net/http"
	"os"

	_ "sample/statik"

	"github.com/rakyll/statik/fs"
)

func main() {
	fmt.Println("Open http://localhost:3000/")
	fmt.Println("Press ctrl+c to stop")

	statikFs, err := fs.New()
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		return
	}
	http.Handle("/", http.FileServer(statikFs))
	if err := http.ListenAndServe(":3000", nil); err != nil {
		fmt.Fprintln(os.Stderr, err)
	}
}

$ go run sample.go 
Open http://localhost:3000/
Press ctrl+c to stop

// A FileSystem implements access to a collection of named files.
// The elements in a file path are separated by slash ('/', U+002F)
// characters, regardless of host operating system convention.
type FileSystem interface {
	Open(name string) (File, error)
}

// A File is returned by a FileSystem's Open method and can be
// served by the FileServer implementation.
//
// The methods should behave the same as those on an *os.File.
type File interface {
	io.Closer
	io.Reader
	io.Seeker
	Readdir(count int) ([]os.FileInfo, error)
	Stat() (os.FileInfo, error)
}

package main

import (
	"fmt"
	"net/http"
	"os"

	_ "sample/statik"

	"github.com/rakyll/statik/fs"
)

//go:generate statik -src html

func main() {
	fmt.Println("Open http://localhost:3000/")
	fmt.Println("Press ctrl+c to stop")

	statikFs, err := fs.New()
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		return
	}
	http.Handle("/", http.FileServer(statikFs))
	if err := http.ListenAndServe(":3000", nil); err != nil {
		fmt.Fprintln(os.Stderr, err)
	}
}

$ go generate

$ go run sample.go 
Open http://localhost:3000/
Press ctrl+c to stop