// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Package execabs is a drop-in replacement for os/exec // that requires PATH lookups to find absolute paths. // That is, execabs.Command("cmd") runs the same PATH lookup // as exec.Command("cmd"), but if the result is a path // which is relative, the Run and Start methods will report // an error instead of running the executable.
package execabs import ( ) var ErrNotFound = exec.ErrNotFound type ( Cmd = exec.Cmd Error = exec.Error ExitError = exec.ExitError ) func relError(, string) error { return fmt.Errorf("%s resolves to executable relative to current directory (.%c%s)", , filepath.Separator, ) } func ( string) (string, error) { , := exec.LookPath() if != nil { return "", } if filepath.Base() == && !filepath.IsAbs() { return "", relError(, ) } return , nil } func fixCmd( string, *exec.Cmd) { if filepath.Base() == && !filepath.IsAbs(.Path) { // exec.Command was called with a bare binary name and // exec.LookPath returned a path which is not absolute. // Set cmd.lookPathErr and clear cmd.Path so that it // cannot be run. := (*error)(unsafe.Pointer(reflect.ValueOf().Elem().FieldByName("lookPathErr").Addr().Pointer())) if * == nil { * = relError(, .Path) } .Path = "" } } func ( context.Context, string, ...string) *exec.Cmd { := exec.CommandContext(, , ...) fixCmd(, ) return } func ( string, ...string) *exec.Cmd { := exec.Command(, ...) fixCmd(, ) return }