func makeMounts(pod *v1.Pod, podDir string, container *v1.Container, hostName, hostDomain string, podIPs []string, podVolumes kubecontainer.VolumeMap, hu hostutil.HostUtils, subpather subpath.Interface, expandEnvs []kubecontainer.EnvVar, supportsRRO bool) ([]kubecontainer.Mount, func(), error) {
	mountEtcHostsFile := shouldMountHostsFile(pod, podIPs)

		Setenv(tt.k, tt.v)
		defer Unsetenv(tt.k)

		argRaw := fmt.Sprintf("$%s", tt.k)
		argWithBrace := fmt.Sprintf("${%s}", tt.k)
		if gotRaw, gotBrace := ExpandEnv(argRaw), ExpandEnv(argWithBrace); gotRaw != gotBrace {
			t.Errorf("ExpandEnv(%q) = %q, ExpandEnv(%q) = %q; expect them to be equal", argRaw, gotRaw, argWithBrace, gotBrace)
		}
	}

			}
			j += w
			i = j + 1
		}
	}
	if buf == nil {
		return s
	}
	return string(buf) + s[i:]
}

// ExpandEnv replaces ${var} or $var in the string according to the values
// of the current environment variables. References to undefined
// variables are replaced by the empty string.
func ExpandEnv(s string) string {
	return Expand(s, Getenv)
}

// isShellSpecialVar reports whether the character identifies a special

// in the form "key=value".
func (s *State) Environ() []string {
	return append([]string(nil), s.env...)
}

// ExpandEnv replaces ${var} or $var in the string according to the values of
// the environment variables in s. References to undefined variables are
// replaced by the empty string.
func (s *State) ExpandEnv(str string, inRegexp bool) string {
	return os.Expand(str, func(key string) string {
		e := s.envMap[key]
		if inRegexp {

	// Output:
	// Good morning, Gopher!
}

func ExampleExpandEnv() {
	os.Setenv("NAME", "gopher")
	os.Setenv("BURROW", "/usr/gopher")

	fmt.Println(os.ExpandEnv("$NAME lives in ${BURROW}."))

	// Output:
	// gopher lives in /usr/gopher.
}

func ExampleLookupEnv() {
	show := func(key string) {
		val, ok := os.LookupEnv(key)
		if !ok {

	// the leading src.FileSymPrefix.
	filename = strings.TrimPrefix(filename, src.FileSymPrefix)

	// Expand literal "$GOROOT" rewritten by obj.AbsFile()
	filename = filepath.Clean(os.ExpandEnv(filename))

	var cf *CachedFile
	var e *list.Element

	for e = fc.files.Front(); e != nil; e = e.Next() {
		cf = e.Value.(*CachedFile)
		if cf.FileName == filename {
			break
		}
	}

			return err
		}
		text1 = string(data)
	}

	data, err := os.ReadFile(s.Path(name2))
	if err != nil {
		return err
	}
	text2 = string(data)

	if env {
		text1 = s.ExpandEnv(text1, false)
		text2 = s.ExpandEnv(text2, false)
	}

	if text1 != text2 {
		if !quiet {
			diffText := diff.Diff(name1, []byte(text1), name2, []byte(text2))
			s.Logf("%s\n", diffText)
		}

			if i == j {
				isRegexp = true
				break
			}
		}

		var b strings.Builder
		for _, frag := range frags {
			if frag.quoted {
				b.WriteString(frag.s)
			} else {
				b.WriteString(s.ExpandEnv(frag.s, isRegexp))
			}
		}
		args = append(args, b.String())
	}
	return args
}

// quoteArgs returns a string that parse would parse as args when passed to a command.
//

// patterns, either call the shell directly, taking care to escape any
// dangerous input, or use the [path/filepath] package's Glob function.
// To expand environment variables, use package os's ExpandEnv.
//
// Note that the examples in this package assume a Unix system.
// They may not run on Windows, and they do not run in the Go Playground
// used by golang.org and godoc.org.
//

	b = os.Getenv("PKG_CONFIG")
	if b == "" {
		b = "pkg-config"
	}
	defaultpkgconfig = b

	defaultldso = os.Getenv("GO_LDSO")

	// For tools being invoked but also for os.ExpandEnv.
	os.Setenv("GO386", go386)
	os.Setenv("GOAMD64", goamd64)
	os.Setenv("GOARCH", goarch)
	os.Setenv("GOARM", goarm)
	os.Setenv("GOARM64", goarm64)
	os.Setenv("GOHOSTARCH", gohostarch)