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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 main
import (
"fmt"
"os"
"runtime"
"strings"
)
var cmdEnv = &Command{
Run: runEnv,
UsageLine: "env [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.
`,
}
type envVar struct {
name, value string
}
func mkEnv() []envVar {
var b builder
b.init()
env := []envVar{
{"GOARCH", goarch},
{"GOBIN", gobin},
{"GOCHAR", archChar},
{"GOEXE", exeSuffix},
{"GOHOSTARCH", runtime.GOARCH},
{"GOHOSTOS", runtime.GOOS},
{"GOOS", goos},
{"GOPATH", os.Getenv("GOPATH")},
{"GORACE", os.Getenv("GORACE")},
{"GOROOT", goroot},
{"GOTOOLDIR", toolDir},
// disable escape codes in clang errors
{"TERM", "dumb"},
}
if goos != "plan9" {
cmd := b.gccCmd(".")
env = append(env, envVar{"CC", cmd[0]})
env = append(env, envVar{"GOGCCFLAGS", strings.Join(cmd[3:], " ")})
cmd = b.gxxCmd(".")
env = append(env, envVar{"CXX", cmd[0]})
}
if buildContext.CgoEnabled {
env = append(env, envVar{"CGO_ENABLED", "1"})
} else {
env = append(env, envVar{"CGO_ENABLED", "0"})
}
return env
}
func findEnv(env []envVar, name string) string {
for _, e := range env {
if e.name == name {
return e.value
}
}
return ""
}
func runEnv(cmd *Command, args []string) {
env := mkEnv()
if len(args) > 0 {
for _, name := range args {
fmt.Printf("%s\n", findEnv(env, name))
}
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)
}
}
}
}
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