blob: e8ec2df9c4ee22cff9c47bbf9657ac5237e0d9d0 [file] [log] [blame]
// skip
// 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.
// Run runs tests in the test directory.
//
// TODO(bradfitz): docs of some sort, once we figure out how we're changing
// headers of files
package main
import (
"bytes"
"errors"
"flag"
"fmt"
"go/build"
"io/ioutil"
"log"
"os"
"os/exec"
"path"
"path/filepath"
"regexp"
"runtime"
"sort"
"strconv"
"strings"
"time"
"unicode"
)
var (
verbose = flag.Bool("v", false, "verbose. if set, parallelism is set to 1.")
numParallel = flag.Int("n", runtime.NumCPU(), "number of parallel tests to run")
summary = flag.Bool("summary", false, "show summary of results")
showSkips = flag.Bool("show_skips", false, "show skipped tests")
runoutputLimit = flag.Int("l", defaultRunOutputLimit(), "number of parallel runoutput tests to run")
)
var (
// gc and ld are [568][gl].
gc, ld string
// letter is the build.ArchChar
letter string
goos, goarch string
// dirs are the directories to look for *.go files in.
// TODO(bradfitz): just use all directories?
dirs = []string{".", "ken", "chan", "interface", "syntax", "dwarf", "fixedbugs", "bugs"}
// ratec controls the max number of tests running at a time.
ratec chan bool
// toRun is the channel of tests to run.
// It is nil until the first test is started.
toRun chan *test
// rungatec controls the max number of runoutput tests
// executed in parallel as they can each consume a lot of memory.
rungatec chan bool
)
// maxTests is an upper bound on the total number of tests.
// It is used as a channel buffer size to make sure sends don't block.
const maxTests = 5000
func main() {
flag.Parse()
goos = getenv("GOOS", runtime.GOOS)
goarch = getenv("GOARCH", runtime.GOARCH)
findExecCmd()
// Disable parallelism if printing or if using a simulator.
if *verbose || len(findExecCmd()) > 0 {
*numParallel = 1
}
ratec = make(chan bool, *numParallel)
rungatec = make(chan bool, *runoutputLimit)
var err error
letter, err = build.ArchChar(build.Default.GOARCH)
check(err)
gc = letter + "g"
ld = letter + "l"
var tests []*test
if flag.NArg() > 0 {
for _, arg := range flag.Args() {
if arg == "-" || arg == "--" {
// Permit running:
// $ go run run.go - env.go
// $ go run run.go -- env.go
// $ go run run.go - ./fixedbugs
// $ go run run.go -- ./fixedbugs
continue
}
if fi, err := os.Stat(arg); err == nil && fi.IsDir() {
for _, baseGoFile := range goFiles(arg) {
tests = append(tests, startTest(arg, baseGoFile))
}
} else if strings.HasSuffix(arg, ".go") {
dir, file := filepath.Split(arg)
tests = append(tests, startTest(dir, file))
} else {
log.Fatalf("can't yet deal with non-directory and non-go file %q", arg)
}
}
} else {
for _, dir := range dirs {
for _, baseGoFile := range goFiles(dir) {
tests = append(tests, startTest(dir, baseGoFile))
}
}
}
failed := false
resCount := map[string]int{}
for _, test := range tests {
<-test.donec
status := "ok "
errStr := ""
if _, isSkip := test.err.(skipError); isSkip {
status = "skip"
test.err = nil
if !skipOkay[path.Join(test.dir, test.gofile)] {
errStr = "unexpected skip for " + path.Join(test.dir, test.gofile) + ": " + errStr
status = "FAIL"
}
}
if test.err != nil {
status = "FAIL"
errStr = test.err.Error()
}
if status == "FAIL" {
failed = true
}
resCount[status]++
if status == "skip" && !*verbose && !*showSkips {
continue
}
dt := fmt.Sprintf("%.3fs", test.dt.Seconds())
if status == "FAIL" {
fmt.Printf("# go run run.go -- %s\n%s\nFAIL\t%s\t%s\n",
path.Join(test.dir, test.gofile),
errStr, test.goFileName(), dt)
continue
}
if !*verbose {
continue
}
fmt.Printf("%s\t%s\t%s\n", status, test.goFileName(), dt)
}
if *summary {
for k, v := range resCount {
fmt.Printf("%5d %s\n", v, k)
}
}
if failed {
os.Exit(1)
}
}
func toolPath(name string) string {
p := filepath.Join(os.Getenv("GOROOT"), "bin", "tool", name)
if _, err := os.Stat(p); err != nil {
log.Fatalf("didn't find binary at %s", p)
}
return p
}
func goFiles(dir string) []string {
f, err := os.Open(dir)
check(err)
dirnames, err := f.Readdirnames(-1)
check(err)
names := []string{}
for _, name := range dirnames {
if !strings.HasPrefix(name, ".") && strings.HasSuffix(name, ".go") {
names = append(names, name)
}
}
sort.Strings(names)
return names
}
type runCmd func(...string) ([]byte, error)
func compileFile(runcmd runCmd, longname string) (out []byte, err error) {
return runcmd("go", "tool", gc, "-e", longname)
}
func compileInDir(runcmd runCmd, dir string, names ...string) (out []byte, err error) {
cmd := []string{"go", "tool", gc, "-e", "-D", ".", "-I", "."}
for _, name := range names {
cmd = append(cmd, filepath.Join(dir, name))
}
return runcmd(cmd...)
}
func linkFile(runcmd runCmd, goname string) (err error) {
pfile := strings.Replace(goname, ".go", "."+letter, -1)
_, err = runcmd("go", "tool", ld, "-w", "-o", "a.exe", "-L", ".", pfile)
return
}
// skipError describes why a test was skipped.
type skipError string
func (s skipError) Error() string { return string(s) }
func check(err error) {
if err != nil {
log.Fatal(err)
}
}
// test holds the state of a test.
type test struct {
dir, gofile string
donec chan bool // closed when done
dt time.Duration
src string
action string // "compile", "build", etc.
tempDir string
err error
}
// startTest
func startTest(dir, gofile string) *test {
t := &test{
dir: dir,
gofile: gofile,
donec: make(chan bool, 1),
}
if toRun == nil {
toRun = make(chan *test, maxTests)
go runTests()
}
select {
case toRun <- t:
default:
panic("toRun buffer size (maxTests) is too small")
}
return t
}
// runTests runs tests in parallel, but respecting the order they
// were enqueued on the toRun channel.
func runTests() {
for {
ratec <- true
t := <-toRun
go func() {
t.run()
<-ratec
}()
}
}
var cwd, _ = os.Getwd()
func (t *test) goFileName() string {
return filepath.Join(t.dir, t.gofile)
}
func (t *test) goDirName() string {
return filepath.Join(t.dir, strings.Replace(t.gofile, ".go", ".dir", -1))
}
func goDirFiles(longdir string) (filter []os.FileInfo, err error) {
files, dirErr := ioutil.ReadDir(longdir)
if dirErr != nil {
return nil, dirErr
}
for _, gofile := range files {
if filepath.Ext(gofile.Name()) == ".go" {
filter = append(filter, gofile)
}
}
return
}
var packageRE = regexp.MustCompile(`(?m)^package (\w+)`)
func goDirPackages(longdir string) ([][]string, error) {
files, err := goDirFiles(longdir)
if err != nil {
return nil, err
}
var pkgs [][]string
m := make(map[string]int)
for _, file := range files {
name := file.Name()
data, err := ioutil.ReadFile(filepath.Join(longdir, name))
if err != nil {
return nil, err
}
pkgname := packageRE.FindStringSubmatch(string(data))
if pkgname == nil {
return nil, fmt.Errorf("cannot find package name in %s", name)
}
i, ok := m[pkgname[1]]
if !ok {
i = len(pkgs)
pkgs = append(pkgs, nil)
m[pkgname[1]] = i
}
pkgs[i] = append(pkgs[i], name)
}
return pkgs, nil
}
type context struct {
GOOS string
GOARCH string
}
// shouldTest looks for build tags in a source file and returns
// whether the file should be used according to the tags.
func shouldTest(src string, goos, goarch string) (ok bool, whyNot string) {
if idx := strings.Index(src, "\npackage"); idx >= 0 {
src = src[:idx]
}
for _, line := range strings.Split(src, "\n") {
line = strings.TrimSpace(line)
if strings.HasPrefix(line, "//") {
line = line[2:]
} else {
continue
}
line = strings.TrimSpace(line)
if len(line) == 0 || line[0] != '+' {
continue
}
ctxt := &context{
GOOS: goos,
GOARCH: goarch,
}
words := strings.Fields(line)
if words[0] == "+build" {
ok := false
for _, word := range words[1:] {
if ctxt.match(word) {
ok = true
break
}
}
if !ok {
// no matching tag found.
return false, line
}
}
}
// no build tags
return true, ""
}
func (ctxt *context) match(name string) bool {
if name == "" {
return false
}
if i := strings.Index(name, ","); i >= 0 {
// comma-separated list
return ctxt.match(name[:i]) && ctxt.match(name[i+1:])
}
if strings.HasPrefix(name, "!!") { // bad syntax, reject always
return false
}
if strings.HasPrefix(name, "!") { // negation
return len(name) > 1 && !ctxt.match(name[1:])
}
// Tags must be letters, digits, underscores or dots.
// Unlike in Go identifiers, all digits are fine (e.g., "386").
for _, c := range name {
if !unicode.IsLetter(c) && !unicode.IsDigit(c) && c != '_' && c != '.' {
return false
}
}
if name == ctxt.GOOS || name == ctxt.GOARCH {
return true
}
return false
}
func init() { checkShouldTest() }
// run runs a test.
func (t *test) run() {
start := time.Now()
defer func() {
t.dt = time.Since(start)
close(t.donec)
}()
srcBytes, err := ioutil.ReadFile(t.goFileName())
if err != nil {
t.err = err
return
}
t.src = string(srcBytes)
if t.src[0] == '\n' {
t.err = skipError("starts with newline")
return
}
pos := strings.Index(t.src, "\n\n")
if pos == -1 {
t.err = errors.New("double newline not found")
return
}
if ok, why := shouldTest(t.src, goos, goarch); !ok {
t.action = "skip"
if *showSkips {
fmt.Printf("%-20s %-20s: %s\n", t.action, t.goFileName(), why)
}
return
}
action := t.src[:pos]
if nl := strings.Index(action, "\n"); nl >= 0 && strings.Contains(action[:nl], "+build") {
// skip first line
action = action[nl+1:]
}
if strings.HasPrefix(action, "//") {
action = action[2:]
}
var args, flags []string
wantError := false
f := strings.Fields(action)
if len(f) > 0 {
action = f[0]
args = f[1:]
}
switch action {
case "rundircmpout":
action = "rundir"
t.action = "rundir"
case "cmpout":
action = "run" // the run case already looks for <dir>/<test>.out files
fallthrough
case "compile", "compiledir", "build", "run", "runoutput", "rundir":
t.action = action
case "errorcheck", "errorcheckdir", "errorcheckoutput":
t.action = action
wantError = true
for len(args) > 0 && strings.HasPrefix(args[0], "-") {
if args[0] == "-0" {
wantError = false
} else {
flags = append(flags, args[0])
}
args = args[1:]
}
case "skip":
t.action = "skip"
return
default:
t.err = skipError("skipped; unknown pattern: " + action)
t.action = "??"
return
}
t.makeTempDir()
defer os.RemoveAll(t.tempDir)
err = ioutil.WriteFile(filepath.Join(t.tempDir, t.gofile), srcBytes, 0644)
check(err)
// A few tests (of things like the environment) require these to be set.
if os.Getenv("GOOS") == "" {
os.Setenv("GOOS", runtime.GOOS)
}
if os.Getenv("GOARCH") == "" {
os.Setenv("GOARCH", runtime.GOARCH)
}
useTmp := true
runcmd := func(args ...string) ([]byte, error) {
cmd := exec.Command(args[0], args[1:]...)
var buf bytes.Buffer
cmd.Stdout = &buf
cmd.Stderr = &buf
if useTmp {
cmd.Dir = t.tempDir
cmd.Env = envForDir(cmd.Dir)
}
err := cmd.Run()
if err != nil {
err = fmt.Errorf("%s\n%s", err, buf.Bytes())
}
return buf.Bytes(), err
}
long := filepath.Join(cwd, t.goFileName())
switch action {
default:
t.err = fmt.Errorf("unimplemented action %q", action)
case "errorcheck":
cmdline := []string{"go", "tool", gc, "-e", "-o", "a." + letter}
cmdline = append(cmdline, flags...)
cmdline = append(cmdline, long)
out, err := runcmd(cmdline...)
if wantError {
if err == nil {
t.err = fmt.Errorf("compilation succeeded unexpectedly\n%s", out)
return
}
} else {
if err != nil {
t.err = err
return
}
}
t.err = t.errorCheck(string(out), long, t.gofile)
return
case "compile":
_, t.err = compileFile(runcmd, long)
case "compiledir":
// Compile all files in the directory in lexicographic order.
longdir := filepath.Join(cwd, t.goDirName())
pkgs, err := goDirPackages(longdir)
if err != nil {
t.err = err
return
}
for _, gofiles := range pkgs {
_, t.err = compileInDir(runcmd, longdir, gofiles...)
if t.err != nil {
return
}
}
case "errorcheckdir":
// errorcheck all files in lexicographic order
// useful for finding importing errors
longdir := filepath.Join(cwd, t.goDirName())
pkgs, err := goDirPackages(longdir)
if err != nil {
t.err = err
return
}
for i, gofiles := range pkgs {
out, err := compileInDir(runcmd, longdir, gofiles...)
if i == len(pkgs)-1 {
if wantError && err == nil {
t.err = fmt.Errorf("compilation succeeded unexpectedly\n%s", out)
return
} else if !wantError && err != nil {
t.err = err
return
}
} else if err != nil {
t.err = err
return
}
var fullshort []string
for _, name := range gofiles {
fullshort = append(fullshort, filepath.Join(longdir, name), name)
}
t.err = t.errorCheck(string(out), fullshort...)
if t.err != nil {
break
}
}
case "rundir":
// Compile all files in the directory in lexicographic order.
// then link as if the last file is the main package and run it
longdir := filepath.Join(cwd, t.goDirName())
pkgs, err := goDirPackages(longdir)
if err != nil {
t.err = err
return
}
for i, gofiles := range pkgs {
_, err := compileInDir(runcmd, longdir, gofiles...)
if err != nil {
t.err = err
return
}
if i == len(pkgs)-1 {
err = linkFile(runcmd, gofiles[0])
if err != nil {
t.err = err
return
}
var cmd []string
cmd = append(cmd, findExecCmd()...)
cmd = append(cmd, filepath.Join(t.tempDir, "a.exe"))
cmd = append(cmd, args...)
out, err := runcmd(cmd...)
if err != nil {
t.err = err
return
}
if strings.Replace(string(out), "\r\n", "\n", -1) != t.expectedOutput() {
t.err = fmt.Errorf("incorrect output\n%s", out)
}
}
}
case "build":
_, err := runcmd("go", "build", "-o", "a.exe", long)
if err != nil {
t.err = err
}
case "run":
useTmp = false
out, err := runcmd(append([]string{"go", "run", t.goFileName()}, args...)...)
if err != nil {
t.err = err
return
}
if strings.Replace(string(out), "\r\n", "\n", -1) != t.expectedOutput() {
t.err = fmt.Errorf("incorrect output\n%s", out)
}
case "runoutput":
rungatec <- true
defer func() {
<-rungatec
}()
useTmp = false
out, err := runcmd(append([]string{"go", "run", t.goFileName()}, args...)...)
if err != nil {
t.err = err
return
}
tfile := filepath.Join(t.tempDir, "tmp__.go")
if err := ioutil.WriteFile(tfile, out, 0666); err != nil {
t.err = fmt.Errorf("write tempfile:%s", err)
return
}
out, err = runcmd("go", "run", tfile)
if err != nil {
t.err = err
return
}
if string(out) != t.expectedOutput() {
t.err = fmt.Errorf("incorrect output\n%s", out)
}
case "errorcheckoutput":
useTmp = false
out, err := runcmd(append([]string{"go", "run", t.goFileName()}, args...)...)
if err != nil {
t.err = err
return
}
tfile := filepath.Join(t.tempDir, "tmp__.go")
err = ioutil.WriteFile(tfile, out, 0666)
if err != nil {
t.err = fmt.Errorf("write tempfile:%s", err)
return
}
cmdline := []string{"go", "tool", gc, "-e", "-o", "a." + letter}
cmdline = append(cmdline, flags...)
cmdline = append(cmdline, tfile)
out, err = runcmd(cmdline...)
if wantError {
if err == nil {
t.err = fmt.Errorf("compilation succeeded unexpectedly\n%s", out)
return
}
} else {
if err != nil {
t.err = err
return
}
}
t.err = t.errorCheck(string(out), tfile, "tmp__.go")
return
}
}
var execCmd []string
func findExecCmd() []string {
if execCmd != nil {
return execCmd
}
execCmd = []string{} // avoid work the second time
if goos == runtime.GOOS && goarch == runtime.GOARCH {
return execCmd
}
path, err := exec.LookPath(fmt.Sprintf("go_%s_%s_exec", goos, goarch))
if err == nil {
execCmd = []string{path}
}
return execCmd
}
func (t *test) String() string {
return filepath.Join(t.dir, t.gofile)
}
func (t *test) makeTempDir() {
var err error
t.tempDir, err = ioutil.TempDir("", "")
check(err)
}
func (t *test) expectedOutput() string {
filename := filepath.Join(t.dir, t.gofile)
filename = filename[:len(filename)-len(".go")]
filename += ".out"
b, _ := ioutil.ReadFile(filename)
return string(b)
}
func (t *test) errorCheck(outStr string, fullshort ...string) (err error) {
defer func() {
if *verbose && err != nil {
log.Printf("%s gc output:\n%s", t, outStr)
}
}()
var errs []error
var out []string
// 6g error messages continue onto additional lines with leading tabs.
// Split the output at the beginning of each line that doesn't begin with a tab.
for _, line := range strings.Split(outStr, "\n") {
if strings.HasSuffix(line, "\r") { // remove '\r', output by compiler on windows
line = line[:len(line)-1]
}
if strings.HasPrefix(line, "\t") {
out[len(out)-1] += "\n" + line
} else if strings.HasPrefix(line, "go tool") {
continue
} else if strings.TrimSpace(line) != "" {
out = append(out, line)
}
}
// Cut directory name.
for i := range out {
for j := 0; j < len(fullshort); j += 2 {
full, short := fullshort[j], fullshort[j+1]
out[i] = strings.Replace(out[i], full, short, -1)
}
}
var want []wantedError
for j := 0; j < len(fullshort); j += 2 {
full, short := fullshort[j], fullshort[j+1]
want = append(want, t.wantedErrors(full, short)...)
}
for _, we := range want {
var errmsgs []string
errmsgs, out = partitionStrings(we.prefix, out)
if len(errmsgs) == 0 {
errs = append(errs, fmt.Errorf("%s:%d: missing error %q", we.file, we.lineNum, we.reStr))
continue
}
matched := false
n := len(out)
for _, errmsg := range errmsgs {
if we.re.MatchString(errmsg) {
matched = true
} else {
out = append(out, errmsg)
}
}
if !matched {
errs = append(errs, fmt.Errorf("%s:%d: no match for %#q in:\n\t%s", we.file, we.lineNum, we.reStr, strings.Join(out[n:], "\n\t")))
continue
}
}
if len(out) > 0 {
errs = append(errs, fmt.Errorf("Unmatched Errors:"))
for _, errLine := range out {
errs = append(errs, fmt.Errorf("%s", errLine))
}
}
if len(errs) == 0 {
return nil
}
if len(errs) == 1 {
return errs[0]
}
var buf bytes.Buffer
fmt.Fprintf(&buf, "\n")
for _, err := range errs {
fmt.Fprintf(&buf, "%s\n", err.Error())
}
return errors.New(buf.String())
}
// matchPrefix reports whether s is of the form ^(.*/)?prefix(:|[),
// That is, it needs the file name prefix followed by a : or a [,
// and possibly preceded by a directory name.
func matchPrefix(s, prefix string) bool {
i := strings.Index(s, ":")
if i < 0 {
return false
}
j := strings.LastIndex(s[:i], "/")
s = s[j+1:]
if len(s) <= len(prefix) || s[:len(prefix)] != prefix {
return false
}
switch s[len(prefix)] {
case '[', ':':
return true
}
return false
}
func partitionStrings(prefix string, strs []string) (matched, unmatched []string) {
for _, s := range strs {
if matchPrefix(s, prefix) {
matched = append(matched, s)
} else {
unmatched = append(unmatched, s)
}
}
return
}
type wantedError struct {
reStr string
re *regexp.Regexp
lineNum int
file string
prefix string
}
var (
errRx = regexp.MustCompile(`// (?:GC_)?ERROR (.*)`)
errQuotesRx = regexp.MustCompile(`"([^"]*)"`)
lineRx = regexp.MustCompile(`LINE(([+-])([0-9]+))?`)
)
func (t *test) wantedErrors(file, short string) (errs []wantedError) {
cache := make(map[string]*regexp.Regexp)
src, _ := ioutil.ReadFile(file)
for i, line := range strings.Split(string(src), "\n") {
lineNum := i + 1
if strings.Contains(line, "////") {
// double comment disables ERROR
continue
}
m := errRx.FindStringSubmatch(line)
if m == nil {
continue
}
all := m[1]
mm := errQuotesRx.FindAllStringSubmatch(all, -1)
if mm == nil {
log.Fatalf("%s:%d: invalid errchk line: %s", t.goFileName(), lineNum, line)
}
for _, m := range mm {
rx := lineRx.ReplaceAllStringFunc(m[1], func(m string) string {
n := lineNum
if strings.HasPrefix(m, "LINE+") {
delta, _ := strconv.Atoi(m[5:])
n += delta
} else if strings.HasPrefix(m, "LINE-") {
delta, _ := strconv.Atoi(m[5:])
n -= delta
}
return fmt.Sprintf("%s:%d", short, n)
})
re := cache[rx]
if re == nil {
var err error
re, err = regexp.Compile(rx)
if err != nil {
log.Fatalf("%s:%d: invalid regexp in ERROR line: %v", t.goFileName(), lineNum, err)
}
cache[rx] = re
}
prefix := fmt.Sprintf("%s:%d", short, lineNum)
errs = append(errs, wantedError{
reStr: rx,
re: re,
prefix: prefix,
lineNum: lineNum,
file: short,
})
}
}
return
}
var skipOkay = map[string]bool{
"fixedbugs/bug248.go": true, // combines errorcheckdir and rundir in the same dir.
"fixedbugs/bug302.go": true, // tests both .$O and .a imports.
"fixedbugs/bug345.go": true, // needs the appropriate flags in gc invocation.
"fixedbugs/bug369.go": true, // needs compiler flags.
"fixedbugs/bug429.go": true, // like "run" but program should fail
"bugs/bug395.go": true,
}
// defaultRunOutputLimit returns the number of runoutput tests that
// can be executed in parallel.
func defaultRunOutputLimit() int {
const maxArmCPU = 2
cpu := runtime.NumCPU()
if runtime.GOARCH == "arm" && cpu > maxArmCPU {
cpu = maxArmCPU
}
return cpu
}
// checkShouldTest runs sanity checks on the shouldTest function.
func checkShouldTest() {
assert := func(ok bool, _ string) {
if !ok {
panic("fail")
}
}
assertNot := func(ok bool, _ string) { assert(!ok, "") }
// Simple tests.
assert(shouldTest("// +build linux", "linux", "arm"))
assert(shouldTest("// +build !windows", "linux", "arm"))
assertNot(shouldTest("// +build !windows", "windows", "amd64"))
// A file with no build tags will always be tested.
assert(shouldTest("// This is a test.", "os", "arch"))
// Build tags separated by a space are OR-ed together.
assertNot(shouldTest("// +build arm 386", "linux", "amd64"))
// Build tags separated by a comma are AND-ed together.
assertNot(shouldTest("// +build !windows,!plan9", "windows", "amd64"))
assertNot(shouldTest("// +build !windows,!plan9", "plan9", "386"))
// Build tags on multiple lines are AND-ed together.
assert(shouldTest("// +build !windows\n// +build amd64", "linux", "amd64"))
assertNot(shouldTest("// +build !windows\n// +build amd64", "windows", "amd64"))
// Test that (!a OR !b) matches anything.
assert(shouldTest("// +build !windows !plan9", "windows", "amd64"))
}
// envForDir returns a copy of the environment
// suitable for running in the given directory.
// The environment is the current process's environment
// but with an updated $PWD, so that an os.Getwd in the
// child will be faster.
func envForDir(dir string) []string {
env := os.Environ()
for i, kv := range env {
if strings.HasPrefix(kv, "PWD=") {
env[i] = "PWD=" + dir
return env
}
}
env = append(env, "PWD="+dir)
return env
}
func getenv(key, def string) string {
value := os.Getenv(key)
if value != "" {
return value
}
return def
}