Golang程序
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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.
// Use an external test to avoid os/exec -> internal/testenv -> os/exec
// circular dependency.
package exec_test
import (
"fmt"
"internal/testenv"
"io"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strconv"
"strings"
"testing"
)
func installExe(t *testing.T, dest, src string) {
fsrc, err := os.Open(src)
if err != nil {
t.Fatal("os.Open failed: ", err)
}
defer fsrc.Close()
fdest, err := os.Create(dest)
if err != nil {
t.Fatal("os.Create failed: ", err)
}
defer fdest.Close()
_, err = io.Copy(fdest, fsrc)
if err != nil {
t.Fatal("io.Copy failed: ", err)
}
}
func installBat(t *testing.T, dest string) {
f, err := os.Create(dest)
if err != nil {
t.Fatalf("failed to create batch file: %v", err)
}
defer f.Close()
fmt.Fprintf(f, "@echo %s\n", dest)
}
func installProg(t *testing.T, dest, srcExe string) {
err := os.MkdirAll(filepath.Dir(dest), 0700)
if err != nil {
t.Fatal("os.MkdirAll failed: ", err)
}
if strings.ToLower(filepath.Ext(dest)) == ".bat" {
installBat(t, dest)
return
}
installExe(t, dest, srcExe)
}
type lookPathTest struct {
rootDir string
PATH string
PATHEXT string
files []string
searchFor string
fails bool // test is expected to fail
}
func (test lookPathTest) runProg(t *testing.T, env []string, args ...string) (string, error) {
cmd := exec.Command(args[0], args[1:]...)
cmd.Env = env
cmd.Dir = test.rootDir
args[0] = filepath.Base(args[0])
cmdText := fmt.Sprintf("%q command", strings.Join(args, " "))
out, err := cmd.CombinedOutput()
if (err != nil) != test.fails {
if test.fails {
t.Fatalf("test=%+v: %s succeeded, but expected to fail", test, cmdText)
}
t.Fatalf("test=%+v: %s failed, but expected to succeed: %v - %v", test, cmdText, err, string(out))
}
if err != nil {
return "", fmt.Errorf("test=%+v: %s failed: %v - %v", test, cmdText, err, string(out))
}
// normalise program output
p := string(out)
// trim terminating \r and \n that batch file outputs
for len(p) > 0 && (p[len(p)-1] == '\n' || p[len(p)-1] == '\r') {
p = p[:len(p)-1]
}
if !filepath.IsAbs(p) {
return p, nil
}
if p[:len(test.rootDir)] != test.rootDir {
t.Fatalf("test=%+v: %s output is wrong: %q must have %q prefix", test, cmdText, p, test.rootDir)
}
return p[len(test.rootDir)+1:], nil
}
func updateEnv(env []string, name, value string) []string {
for i, e := range env {
if strings.HasPrefix(strings.ToUpper(e), name+"=") {
env[i] = name + "=" + value
return env
}
}
return append(env, name+"="+value)
}
func createEnv(dir, PATH, PATHEXT string) []string {
env := os.Environ()
env = updateEnv(env, "PATHEXT", PATHEXT)
// Add dir in front of every directory in the PATH.
dirs := filepath.SplitList(PATH)
for i := range dirs {
dirs[i] = filepath.Join(dir, dirs[i])
}
path := strings.Join(dirs, ";")
env = updateEnv(env, "PATH", path)
return env
}
// createFiles copies srcPath file into multiply files.
// It uses dir as prefix for all destination files.
func createFiles(t *testing.T, dir string, files []string, srcPath string) {
for _, f := range files {
installProg(t, filepath.Join(dir, f), srcPath)
}
}
func (test lookPathTest) run(t *testing.T, tmpdir, printpathExe string) {
test.rootDir = tmpdir
createFiles(t, test.rootDir, test.files, printpathExe)
env := createEnv(test.rootDir, test.PATH, test.PATHEXT)
// Run "cmd.exe /c test.searchFor" with new environment and
// work directory set. All candidates are copies of printpath.exe.
// These will output their program paths when run.
should, errCmd := test.runProg(t, env, "cmd", "/c", test.searchFor)
// Run the lookpath program with new environment and work directory set.
env = append(env, "GO_WANT_HELPER_PROCESS=1")
have, errLP := test.runProg(t, env, os.Args[0], "-test.run=TestHelperProcess", "--", "lookpath", test.searchFor)
// Compare results.
if errCmd == nil && errLP == nil {
// both succeeded
if should != have {
t.Fatalf("test=%+v failed: expected to find %q, but found %q", test, should, have)
}
return
}
if errCmd != nil && errLP != nil {
// both failed -> continue
return
}
if errCmd != nil {
t.Fatal(errCmd)
}
if errLP != nil {
t.Fatal(errLP)
}
}
var lookPathTests = []lookPathTest{
{
PATHEXT: `.COM;.EXE;.BAT`,
PATH: `p1;p2`,
files: []string{`p1\a.exe`, `p2\a.exe`, `p2\a`},
searchFor: `a`,
},
{
PATHEXT: `.COM;.EXE;.BAT`,
PATH: `p1.dir;p2.dir`,
files: []string{`p1.dir\a`, `p2.dir\a.exe`},
searchFor: `a`,
},
{
PATHEXT: `.COM;.EXE;.BAT`,
PATH: `p1;p2`,
files: []string{`p1\a.exe`, `p2\a.exe`},
searchFor: `a.exe`,
},
{
PATHEXT: `.COM;.EXE;.BAT`,
PATH: `p1;p2`,
files: []string{`p1\a.exe`, `p2\b.exe`},
searchFor: `b`,
},
{
PATHEXT: `.COM;.EXE;.BAT`,
PATH: `p1;p2`,
files: []string{`p1\b`, `p2\a`},
searchFor: `a`,
fails: true, // TODO(brainman): do not know why this fails
},
// If the command name specifies a path, the shell searches
// the specified path for an executable file matching
// the command name. If a match is found, the external
// command (the executable file) executes.
{
PATHEXT: `.COM;.EXE;.BAT`,
PATH: `p1;p2`,
files: []string{`p1\a.exe`, `p2\a.exe`},
searchFor: `p2\a`,
},
// If the command name specifies a path, the shell searches
// the specified path for an executable file matching the command
// name. ... If no match is found, the shell reports an error
// and command processing completes.
{
PATHEXT: `.COM;.EXE;.BAT`,
PATH: `p1;p2`,
files: []string{`p1\b.exe`, `p2\a.exe`},
searchFor: `p2\b`,
fails: true,
},
// If the command name does not specify a path, the shell
// searches the current directory for an executable file
// matching the command name. If a match is found, the external
// command (the executable file) executes.
{
PATHEXT: `.COM;.EXE;.BAT`,
PATH: `p1;p2`,
files: []string{`a`, `p1\a.exe`, `p2\a.exe`},
searchFor: `a`,
},
// The shell now searches each directory specified by the
// PATH environment variable, in the order listed, for an
// executable file matching the command name. If a match
// is found, the external command (the executable file) executes.
{
PATHEXT: `.COM;.EXE;.BAT`,
PATH: `p1;p2`,
files: []string{`p1\a.exe`, `p2\a.exe`},
searchFor: `a`,
},
// The shell now searches each directory specified by the
// PATH environment variable, in the order listed, for an
// executable file matching the command name. If no match
// is found, the shell reports an error and command processing
// completes.
{
PATHEXT: `.COM;.EXE;.BAT`,
PATH: `p1;p2`,
files: []string{`p1\a.exe`, `p2\a.exe`},
searchFor: `b`,
fails: true,
},
// If the command name includes a file extension, the shell
// searches each directory for the exact file name specified
// by the command name.
{
PATHEXT: `.COM;.EXE;.BAT`,
PATH: `p1;p2`,
files: []string{`p1\a.exe`, `p2\a.exe`},
searchFor: `a.exe`,
},
{
PATHEXT: `.COM;.EXE;.BAT`,
PATH: `p1;p2`,
files: []string{`p1\a.exe`, `p2\a.exe`},
searchFor: `a.com`,
fails: true, // includes extension and not exact file name match
},
{
PATHEXT: `.COM;.EXE;.BAT`,
PATH: `p1`,
files: []string{`p1\a.exe.exe`},
searchFor: `a.exe`,
},
{
PATHEXT: `.COM;.BAT`,
PATH: `p1;p2`,
files: []string{`p1\a.exe`, `p2\a.exe`},
searchFor: `a.exe`,
},
// If the command name does not include a file extension, the shell
// adds the extensions listed in the PATHEXT environment variable,
// one by one, and searches the directory for that file name. Note
// that the shell tries all possible file extensions in a specific
// directory before moving on to search the next directory
// (if there is one).
{
PATHEXT: `.COM;.EXE`,
PATH: `p1;p2`,
files: []string{`p1\a.bat`, `p2\a.exe`},
searchFor: `a`,
},
{
PATHEXT: `.COM;.EXE;.BAT`,
PATH: `p1;p2`,
files: []string{`p1\a.bat`, `p2\a.exe`},
searchFor: `a`,
},
{
PATHEXT: `.COM;.EXE;.BAT`,
PATH: `p1;p2`,
files: []string{`p1\a.bat`, `p1\a.exe`, `p2\a.bat`, `p2\a.exe`},
searchFor: `a`,
},
{
PATHEXT: `.COM`,
PATH: `p1;p2`,
files: []string{`p1\a.bat`, `p2\a.exe`},
searchFor: `a`,
fails: true, // tried all extensions in PATHEXT, but none matches
},
}
func TestLookPath(t *testing.T) {
tmp, err := ioutil.TempDir("", "TestLookPath")
if err != nil {
t.Fatal("TempDir failed: ", err)
}
defer os.RemoveAll(tmp)
printpathExe := buildPrintPathExe(t, tmp)
// Run all tests.
for i, test := range lookPathTests {
dir := filepath.Join(tmp, "d"+strconv.Itoa(i))
err := os.Mkdir(dir, 0700)
if err != nil {
t.Fatal("Mkdir failed: ", err)
}
test.run(t, dir, printpathExe)
}
}
type commandTest struct {
PATH string
files []string
dir string
arg0 string
want string
fails bool // test is expected to fail
}
func (test commandTest) isSuccess(rootDir, output string, err error) error {
if err != nil {
return fmt.Errorf("test=%+v: exec: %v %v", test, err, output)
}
path := output
if path[:len(rootDir)] != rootDir {
return fmt.Errorf("test=%+v: %q must have %q prefix", test, path, rootDir)
}
path = path[len(rootDir)+1:]
if path != test.want {
return fmt.Errorf("test=%+v: want %q, got %q", test, test.want, path)
}
return nil
}
func (test commandTest) runOne(rootDir string, env []string, dir, arg0 string) error {
cmd := exec.Command(os.Args[0], "-test.run=TestHelperProcess", "--", "exec", dir, arg0)
cmd.Dir = rootDir
cmd.Env = env
output, err := cmd.CombinedOutput()
err = test.isSuccess(rootDir, string(output), err)
if (err != nil) != test.fails {
if test.fails {
return fmt.Errorf("test=%+v: succeeded, but expected to fail", test)
}
return err
}
return nil
}
func (test commandTest) run(t *testing.T, rootDir, printpathExe string) {
createFiles(t, rootDir, test.files, printpathExe)
PATHEXT := `.COM;.EXE;.BAT`
env := createEnv(rootDir, test.PATH, PATHEXT)
env = append(env, "GO_WANT_HELPER_PROCESS=1")
err := test.runOne(rootDir, env, test.dir, test.arg0)
if err != nil {
t.Error(err)
}
}
var commandTests = []commandTest{
// testing commands with no slash, like `a.exe`
{
// should find a.exe in current directory
files: []string{`a.exe`},
arg0: `a.exe`,
want: `a.exe`,
},
{
// like above, but add PATH in attempt to break the test
PATH: `p2;p`,
files: []string{`a.exe`, `p\a.exe`, `p2\a.exe`},
arg0: `a.exe`,
want: `a.exe`,
},
{
// like above, but use "a" instead of "a.exe" for command
PATH: `p2;p`,
files: []string{`a.exe`, `p\a.exe`, `p2\a.exe`},
arg0: `a`,
want: `a.exe`,
},
// testing commands with slash, like `.\a.exe`
{
// should find p\a.exe
files: []string{`p\a.exe`},
arg0: `p\a.exe`,
want: `p\a.exe`,
},
{
// like above, but adding `.` in front of executable should still be OK
files: []string{`p\a.exe`},
arg0: `.\p\a.exe`,
want: `p\a.exe`,
},
{
// like above, but with PATH added in attempt to break it
PATH: `p2`,
files: []string{`p\a.exe`, `p2\a.exe`},
arg0: `p\a.exe`,
want: `p\a.exe`,
},
{
// like above, but make sure .exe is tried even for commands with slash
PATH: `p2`,
files: []string{`p\a.exe`, `p2\a.exe`},
arg0: `p\a`,
want: `p\a.exe`,
},
// tests commands, like `a.exe`, with c.Dir set
{
// should not find a.exe in p, because LookPath(`a.exe`) will fail
files: []string{`p\a.exe`},
dir: `p`,
arg0: `a.exe`,
want: `p\a.exe`,
fails: true,
},
{
// LookPath(`a.exe`) will find `.\a.exe`, but prefixing that with
// dir `p\a.exe` will refer to a non-existent file
files: []string{`a.exe`, `p\not_important_file`},
dir: `p`,
arg0: `a.exe`,
want: `a.exe`,
fails: true,
},
{
// like above, but making test succeed by installing file
// in referred destination (so LookPath(`a.exe`) will still
// find `.\a.exe`, but we successfully execute `p\a.exe`)
files: []string{`a.exe`, `p\a.exe`},
dir: `p`,
arg0: `a.exe`,
want: `p\a.exe`,
},
{
// like above, but add PATH in attempt to break the test
PATH: `p2;p`,
files: []string{`a.exe`, `p\a.exe`, `p2\a.exe`},
dir: `p`,
arg0: `a.exe`,
want: `p\a.exe`,
},
{
// like above, but use "a" instead of "a.exe" for command
PATH: `p2;p`,
files: []string{`a.exe`, `p\a.exe`, `p2\a.exe`},
dir: `p`,
arg0: `a`,
want: `p\a.exe`,
},
{
// finds `a.exe` in the PATH regardless of dir set
// because LookPath returns full path in that case
PATH: `p2;p`,
files: []string{`p\a.exe`, `p2\a.exe`},
dir: `p`,
arg0: `a.exe`,
want: `p2\a.exe`,
},
// tests commands, like `.\a.exe`, with c.Dir set
{
// should use dir when command is path, like ".\a.exe"
files: []string{`p\a.exe`},
dir: `p`,
arg0: `.\a.exe`,
want: `p\a.exe`,
},
{
// like above, but with PATH added in attempt to break it
PATH: `p2`,
files: []string{`p\a.exe`, `p2\a.exe`},
dir: `p`,
arg0: `.\a.exe`,
want: `p\a.exe`,
},
{
// like above, but make sure .exe is tried even for commands with slash
PATH: `p2`,
files: []string{`p\a.exe`, `p2\a.exe`},
dir: `p`,
arg0: `.\a`,
want: `p\a.exe`,
},
}
func TestCommand(t *testing.T) {
tmp, err := ioutil.TempDir("", "TestCommand")
if err != nil {
t.Fatal("TempDir failed: ", err)
}
defer os.RemoveAll(tmp)
printpathExe := buildPrintPathExe(t, tmp)
// Run all tests.
for i, test := range commandTests {
dir := filepath.Join(tmp, "d"+strconv.Itoa(i))
err := os.Mkdir(dir, 0700)
if err != nil {
t.Fatal("Mkdir failed: ", err)
}
test.run(t, dir, printpathExe)
}
}
// buildPrintPathExe creates a Go program that prints its own path.
// dir is a temp directory where executable will be created.
// The function returns full path to the created program.
func buildPrintPathExe(t *testing.T, dir string) string {
const name = "printpath"
srcname := name + ".go"
err := ioutil.WriteFile(filepath.Join(dir, srcname), []byte(printpathSrc), 0644)
if err != nil {
t.Fatalf("failed to create source: %v", err)
}
if err != nil {
t.Fatalf("failed to execute template: %v", err)
}
outname := name + ".exe"
cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", outname, srcname)
cmd.Dir = dir
out, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("failed to build executable: %v - %v", err, string(out))
}
return filepath.Join(dir, outname)
}
const printpathSrc = `
package main
import (
"os"
"syscall"
"unicode/utf16"
"unsafe"
)
func getMyName() (string, error) {
var sysproc = syscall.MustLoadDLL("kernel32.dll").MustFindProc("GetModuleFileNameW")
b := make([]uint16, syscall.MAX_PATH)
r, _, err := sysproc.Call(0, uintptr(unsafe.Pointer(&b[0])), uintptr(len(b)))
n := uint32(r)
if n == 0 {
return "", err
}
return string(utf16.Decode(b[0:n])), nil
}
func main() {
path, err := getMyName()
if err != nil {
os.Stderr.Write([]byte("getMyName failed: " + err.Error() + "\n"))
os.Exit(1)
}
os.Stdout.Write([]byte(path))
}
`