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// Copyright 2012 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 envcmd implements the ``go env'' command.
package envcmd
import (
"encoding/json"
"fmt"
"os"
"path/filepath"
"runtime"
"strings"
"cmd/go/internal/base"
"cmd/go/internal/cache"
"cmd/go/internal/cfg"
"cmd/go/internal/load"
"cmd/go/internal/modload"
"cmd/go/internal/work"
)
var CmdEnv = &base.Command{
UsageLine: "go env [-json] [var ...]",
Short: "print Go environment information",
Long: `
Env prints Go environment information.
By default env prints information as a shell script
(on Windows, a batch file). If one or more variable
names is given as arguments, env prints the value of
each named variable on its own line.
The -json flag prints the environment in JSON format
instead of as a shell script.
For more about environment variables, see 'go help environment'.
`,
}
func init() {
CmdEnv.Run = runEnv // break init cycle
}
var envJson = CmdEnv.Flag.Bool("json", false, "")
func MkEnv() []cfg.EnvVar {
var b work.Builder
b.Init()
env := []cfg.EnvVar{
{Name: "GOARCH", Value: cfg.Goarch},
{Name: "GOBIN", Value: cfg.GOBIN},
{Name: "GOCACHE", Value: cache.DefaultDir()},
{Name: "GOEXE", Value: cfg.ExeSuffix},
{Name: "GOFLAGS", Value: os.Getenv("GOFLAGS")},
{Name: "GOHOSTARCH", Value: runtime.GOARCH},
{Name: "GOHOSTOS", Value: runtime.GOOS},
{Name: "GOOS", Value: cfg.Goos},
{Name: "GOPATH", Value: cfg.BuildContext.GOPATH},
{Name: "GOPROXY", Value: os.Getenv("GOPROXY")},
{Name: "GORACE", Value: os.Getenv("GORACE")},
{Name: "GOROOT", Value: cfg.GOROOT},
{Name: "GOTMPDIR", Value: os.Getenv("GOTMPDIR")},
{Name: "GOTOOLDIR", Value: base.ToolDir},
}
if work.GccgoBin != "" {
env = append(env, cfg.EnvVar{Name: "GCCGO", Value: work.GccgoBin})
} else {
env = append(env, cfg.EnvVar{Name: "GCCGO", Value: work.GccgoName})
}
switch cfg.Goarch {
case "arm":
env = append(env, cfg.EnvVar{Name: "GOARM", Value: cfg.GOARM})
case "386":
env = append(env, cfg.EnvVar{Name: "GO386", Value: cfg.GO386})
case "mips", "mipsle":
env = append(env, cfg.EnvVar{Name: "GOMIPS", Value: cfg.GOMIPS})
case "mips64", "mips64le":
env = append(env, cfg.EnvVar{Name: "GOMIPS64", Value: cfg.GOMIPS64})
}
cc := cfg.DefaultCC(cfg.Goos, cfg.Goarch)
if env := strings.Fields(os.Getenv("CC")); len(env) > 0 {
cc = env[0]
}
cxx := cfg.DefaultCXX(cfg.Goos, cfg.Goarch)
if env := strings.Fields(os.Getenv("CXX")); len(env) > 0 {
cxx = env[0]
}
env = append(env, cfg.EnvVar{Name: "CC", Value: cc})
env = append(env, cfg.EnvVar{Name: "CXX", Value: cxx})
if cfg.BuildContext.CgoEnabled {
env = append(env, cfg.EnvVar{Name: "CGO_ENABLED", Value: "1"})
} else {
env = append(env, cfg.EnvVar{Name: "CGO_ENABLED", Value: "0"})
}
return env
}
func findEnv(env []cfg.EnvVar, name string) string {
for _, e := range env {
if e.Name == name {
return e.Value
}
}
return ""
}
// ExtraEnvVars returns environment variables that should not leak into child processes.
func ExtraEnvVars() []cfg.EnvVar {
gomod := ""
if modload.Init(); modload.ModRoot != "" {
gomod = filepath.Join(modload.ModRoot, "go.mod")
}
return []cfg.EnvVar{
{Name: "GOMOD", Value: gomod},
}
}
// ExtraEnvVarsCostly returns environment variables that should not leak into child processes
// but are costly to evaluate.
func ExtraEnvVarsCostly() []cfg.EnvVar {
var b work.Builder
b.Init()
cppflags, cflags, cxxflags, fflags, ldflags, err := b.CFlags(&load.Package{})
if err != nil {
// Should not happen - b.CFlags was given an empty package.
fmt.Fprintf(os.Stderr, "go: invalid cflags: %v\n", err)
return nil
}
cmd := b.GccCmd(".", "")
return []cfg.EnvVar{
// Note: Update the switch in runEnv below when adding to this list.
{Name: "CGO_CFLAGS", Value: strings.Join(cflags, " ")},
{Name: "CGO_CPPFLAGS", Value: strings.Join(cppflags, " ")},
{Name: "CGO_CXXFLAGS", Value: strings.Join(cxxflags, " ")},
{Name: "CGO_FFLAGS", Value: strings.Join(fflags, " ")},
{Name: "CGO_LDFLAGS", Value: strings.Join(ldflags, " ")},
{Name: "PKG_CONFIG", Value: b.PkgconfigCmd()},
{Name: "GOGCCFLAGS", Value: strings.Join(cmd[3:], " ")},
}
}
func runEnv(cmd *base.Command, args []string) {
env := cfg.CmdEnv
env = append(env, ExtraEnvVars()...)
// Do we need to call ExtraEnvVarsCostly, which is a bit expensive?
// Only if we're listing all environment variables ("go env")
// or the variables being requested are in the extra list.
needCostly := true
if len(args) > 0 {
needCostly = false
for _, arg := range args {
switch arg {
case "CGO_CFLAGS",
"CGO_CPPFLAGS",
"CGO_CXXFLAGS",
"CGO_FFLAGS",
"CGO_LDFLAGS",
"PKG_CONFIG",
"GOGCCFLAGS":
needCostly = true
}
}
}
if needCostly {
env = append(env, ExtraEnvVarsCostly()...)
}
if len(args) > 0 {
if *envJson {
var es []cfg.EnvVar
for _, name := range args {
e := cfg.EnvVar{Name: name, Value: findEnv(env, name)}
es = append(es, e)
}
printEnvAsJSON(es)
} else {
for _, name := range args {
fmt.Printf("%s\n", findEnv(env, name))
}
}
return
}
if *envJson {
printEnvAsJSON(env)
return
}
for _, e := range env {
if e.Name != "TERM" {
switch runtime.GOOS {
default:
fmt.Printf("%s=\"%s\"\n", e.Name, e.Value)
case "plan9":
if strings.IndexByte(e.Value, '\x00') < 0 {
fmt.Printf("%s='%s'\n", e.Name, strings.Replace(e.Value, "'", "''", -1))
} else {
v := strings.Split(e.Value, "\x00")
fmt.Printf("%s=(", e.Name)
for x, s := range v {
if x > 0 {
fmt.Printf(" ")
}
fmt.Printf("%s", s)
}
fmt.Printf(")\n")
}
case "windows":
fmt.Printf("set %s=%s\n", e.Name, e.Value)
}
}
}
}
func printEnvAsJSON(env []cfg.EnvVar) {
m := make(map[string]string)
for _, e := range env {
if e.Name == "TERM" {
continue
}
m[e.Name] = e.Value
}
enc := json.NewEncoder(os.Stdout)
enc.SetIndent("", "\t")
if err := enc.Encode(m); err != nil {
base.Fatalf("%s", err)
}
}
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