common/reexec: move unused method

common/reexec/reexec.go

@@ -12,8 +12,6 @@ package reexec
 import (
 	"fmt"
 	"os"
-	"os/exec"
-	"path/filepath"
 )
 
 var registeredInitializers = make(map[string]func())
@@ -23,34 +21,15 @@ 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 {
+	if initializer, ok := registeredInitializers[os.Args[0]]; ok {
 		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
-}

common/reexec/self_linux.go

@@ -1,3 +1,8 @@
+// This file originates from Docker/Moby,
+// https://github.com/moby/moby/blob/master/pkg/reexec/
+// Licensed under AGPL V2: https://github.com/moby/moby/blob/master/LICENSE
+// Copyright 2013-2018 Docker, Inc.
+
 //go:build linux
 
 package reexec

common/reexec/self_others.go

@@ -1,9 +1,32 @@
+// This file originates from Docker/Moby,
+// https://github.com/moby/moby/blob/master/pkg/reexec/
+// Licensed under AGPL V2: https://github.com/moby/moby/blob/master/LICENSE
+// Copyright 2013-2018 Docker, Inc.
+
 //go:build !linux
 
 package reexec
 
+import (
+	"os"
+	"os/exec"
+	"path/filepath"
+)
+
 // Self returns the path to the current process's binary.
 // Uses os.Args[0].
 func Self() string {
-	return naiveSelf()
+	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
 }