dotcloud/docker

//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)
}