LazyExe

Lazily write an executable to disk. Useful for embedding executables via go's new //go:embed directive.

A new LazyExe can be created by running lazyexe.New(exeBytes). Don't call Path() until you need to run the embedded executable.

The executable is written out to your tmp folder and chmoded the first time the Path() is requested. Subsequent calls to Path() will return the same executable. When finished using the executable you are expected to call Cleanup() to ensure the temporary file is removed from the system.

Example

Try running example/main.go which embeds a cosmopolitan libc hello world, loads it, and runs it!

package main

import (
	_ "embed"
	"fmt"
	"log"
	"os/exec"

	"github.com/fcjr/lazyexe"
)

//go:embed hello.com
var helloworld []byte

func main() {
	exe := lazyexe.New(helloworld)
	defer exe.Cleanup()

	exePath, err := exe.Path()
	if err != nil {
		log.Fatal(err)
	}

	out, err := exec.Command(exePath).CombinedOutput()
	if err != nil {
		log.Fatal(err)
	}
	fmt.Print(string(out))
}