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// Copyright 2013 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.
// +build ignore
// The run program is invoked via "go run" from src/run.bash or
// src/run.bat conditionally builds and runs the cmd/api tool.
//
// TODO(bradfitz): the "conditional" condition is always true.
// We should only do this if the user has the hg codereview extension
// enabled and verifies that the go.tools subrepo is checked out with
// a suitably recently version. In prep for the cmd/api rewrite.
package main
import (
"fmt"
"log"
"net/http"
"os"
"os/exec"
"os/user"
"path/filepath"
"strings"
)
// goToolsVersion is the hg revision of the go.tools subrepo we need
// to build cmd/api. This only needs to be updated whenever a go/types
// bug fix is needed by the cmd/api tool.
const goToolsVersion = "6698ca2900e2"
var goroot string
func main() {
log.SetFlags(0)
goroot = os.Getenv("GOROOT") // should be set by run.{bash,bat}
if goroot == "" {
log.Fatal("No $GOROOT set.")
}
_, err := exec.LookPath("hg")
if err != nil {
fmt.Println("Skipping cmd/api checks; hg not available")
return
}
gopath := prepGoPath()
cmd := exec.Command("go", "install", "--tags=api_tool", "cmd/api")
cmd.Env = append(filterOut(os.Environ(), "GOARCH", "GOPATH"), "GOPATH="+gopath)
out, err := cmd.CombinedOutput()
if err != nil {
log.Fatalf("Error installing cmd/api: %v\n%s", err, out)
}
out, err = exec.Command("go", "tool", "api",
"-c", file("go1", "go1.1", "go1.2", "go1.3"),
"-next", file("next"),
"-except", file("except")).CombinedOutput()
if err != nil {
log.Fatalf("Error running API checker: %v\n%s", err, out)
}
fmt.Print(string(out))
}
// filterOut returns a copy of the src environment without environment
// variables from remove.
// TODO: delete when issue 6201 is fixed.
func filterOut(src []string, remove ...string) (out []string) {
S:
for _, s := range src {
for _, r := range remove {
if strings.HasPrefix(s, r) && strings.HasPrefix(s, r+"=") {
continue S
}
}
out = append(out, s)
}
return
}
// file expands s to $GOROOT/api/s.txt.
// If there are more than 1, they're comma-separated.
func file(s ...string) string {
if len(s) > 1 {
return file(s[0]) + "," + file(s[1:]...)
}
return filepath.Join(goroot, "api", s[0]+".txt")
}
// prepGoPath returns a GOPATH for the "go" tool to compile the API tool with.
// It tries to re-use a go.tools checkout from a previous run if possible,
// else it hg clones it.
func prepGoPath() string {
const tempBase = "go.tools.TMP"
username := ""
u, err := user.Current()
if err == nil {
username = u.Username
} else {
// Only need to handle Unix here, as Windows's os/user uses
// native syscall and should work fine without cgo.
username = os.Getenv("USER")
if username == "" {
log.Fatalf("Error getting current user: %v", err)
}
}
// The GOPATH we'll return
gopath := filepath.Join(os.TempDir(), "gopath-api-"+cleanUsername(username), goToolsVersion)
// cloneDir is where we run "hg clone".
cloneDir := filepath.Join(gopath, "src", "code.google.com", "p")
// The dir we clone into. We only atomically rename it to finalDir on
// clone success.
tmpDir := filepath.Join(cloneDir, tempBase)
// finalDir is where the checkout will live once it's complete.
finalDir := filepath.Join(cloneDir, "go.tools")
if goToolsCheckoutGood(finalDir) {
return gopath
}
os.RemoveAll(finalDir) // in case it's there but corrupt
os.RemoveAll(tmpDir) // in case of aborted hg clone before
if err := os.MkdirAll(cloneDir, 0700); err != nil {
log.Fatal(err)
}
cmd := exec.Command("hg",
"clone", "--rev="+goToolsVersion,
"https://code.google.com/p/go.tools",
tempBase)
cmd.Dir = cloneDir
out, err := cmd.CombinedOutput()
if err != nil {
if _, err := http.Head("http://ip.appspot.com/"); err != nil {
log.Printf("# Skipping API check; network appears to be unavailable")
os.Exit(0)
}
log.Fatalf("Error running hg clone on go.tools: %v\n%s", err, out)
}
if err := os.Rename(tmpDir, finalDir); err != nil {
log.Fatal(err)
}
return gopath
}
func cleanUsername(n string) string {
b := make([]rune, len(n))
for i, r := range n {
if r == '\\' || r == '/' || r == ':' {
b[i] = '_'
} else {
b[i] = r
}
}
return string(b)
}
func goToolsCheckoutGood(dir string) bool {
if _, err := os.Stat(dir); err != nil {
return false
}
cmd := exec.Command("hg", "id", "--id")
cmd.Dir = dir
out, err := cmd.Output()
if err != nil {
return false
}
id := strings.TrimSpace(string(out))
if id != goToolsVersion {
return false
}
cmd = exec.Command("hg", "status")
cmd.Dir = dir
out, err = cmd.Output()
if err != nil || len(out) > 0 {
return false
}
return true
}
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