moby--moby/pkg/idtools/utils_unix.go

// +build !windows

package idtools // import "github.com/docker/docker/pkg/idtools"

import (
	"fmt"
	"os/exec"
	"path/filepath"
)

func resolveBinary(binname string) (string, error) {
	binaryPath, err := exec.LookPath(binname)
	if err != nil {
		return "", err
	}
	resolvedPath, err := filepath.EvalSymlinks(binaryPath)
	if err != nil {
		return "", err
	}
	// only return no error if the final resolved binary basename
	// matches what was searched for
	if filepath.Base(resolvedPath) == binname {
		return resolvedPath, nil
	}
	return "", fmt.Errorf("Binary %q does not resolve to a binary of that name in $PATH (%q)", binname, resolvedPath)
}

func execCmd(cmd string, arg ...string) ([]byte, error) {
	execCmd := exec.Command(cmd, arg...)
	return execCmd.CombinedOutput()
}