mirror of
https://github.com/ethereum/go-ethereum.git
synced 2026-08-20 10:52:25 +00:00
56 lines
1.5 KiB
Go
56 lines
1.5 KiB
Go
// This file originates from Docker/Moby,
|
|
// https://github.com/moby/moby/blob/master/pkg/reexec/reexec.go
|
|
// Licensed under AGPL V2: https://github.com/moby/moby/blob/master/LICENSE
|
|
// Copyright 2013-2018 Docker, Inc.
|
|
//
|
|
// Package reexec facilitates the busybox style reexec of the docker binary that
|
|
// we require because of the forking limitations of using Go. Handlers can be
|
|
// registered with a name and the argv 0 of the exec of the binary will be used
|
|
// to find and execute custom init paths.
|
|
package reexec
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
"os/exec"
|
|
"path/filepath"
|
|
)
|
|
|
|
var registeredInitializers = make(map[string]func())
|
|
|
|
// Register adds an initialization func under the specified name
|
|
func Register(name string, initializer func()) {
|
|
if _, exists := registeredInitializers[name]; exists {
|
|
panic(fmt.Sprintf("reexec func already registered under name %q", name))
|
|
}
|
|
|
|
registeredInitializers[name] = initializer
|
|
}
|
|
|
|
// Init is called as the first part of the exec process and returns true if an
|
|
// initialization function was called.
|
|
func Init() bool {
|
|
initializer, exists := registeredInitializers[os.Args[0]]
|
|
if exists {
|
|
initializer()
|
|
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func naiveSelf() string {
|
|
name := os.Args[0]
|
|
if filepath.Base(name) == name {
|
|
if lp, err := exec.LookPath(name); err == nil {
|
|
return lp
|
|
}
|
|
}
|
|
// handle conversion of relative paths to absolute
|
|
if absName, err := filepath.Abs(name); err == nil {
|
|
return absName
|
|
}
|
|
// if we couldn't get absolute name, return original
|
|
// (NOTE: Go only errors on Abs() if os.Getwd fails)
|
|
return name
|
|
}
|