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// Copyright 2023 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.
//go:build !js && !wasip1
package toolchain
import (
"cmd/go/internal/base"
"internal/godebug"
"os"
"os/exec"
"runtime"
"syscall"
)
// execGoToolchain execs the Go toolchain with the given name (gotoolchain),
// GOROOT directory, and go command executable.
// The GOROOT directory is empty if we are invoking a command named
// gotoolchain found in $PATH.
func execGoToolchain(gotoolchain, dir, exe string) {
os.Setenv(targetEnv, gotoolchain)
if dir == "" {
os.Unsetenv("GOROOT")
} else {
os.Setenv("GOROOT", dir)
}
// On Windows, there is no syscall.Exec, so the best we can do
// is run a subprocess and exit with the same status.
// Doing the same on Unix would be a problem because it wouldn't
// propagate signals and such, but there are no signals on Windows.
// We also use the exec case when GODEBUG=gotoolchainexec=0,
// to allow testing this code even when not on Windows.
if godebug.New("#gotoolchainexec").Value() == "0" || runtime.GOOS == "windows" {
cmd := exec.Command(exe, os.Args[1:]...)
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
err := cmd.Run()
if err != nil {
if e, ok := err.(*exec.ExitError); ok && e.ProcessState != nil {
if e.ProcessState.Exited() {
os.Exit(e.ProcessState.ExitCode())
}
base.Fatalf("exec %s: %s", gotoolchain, e.ProcessState)
}
base.Fatalf("exec %s: %s", exe, err)
}
os.Exit(0)
}
err := syscall.Exec(exe, os.Args, os.Environ())
base.Fatalf("exec %s: %v", gotoolchain, err)
}
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