gotosocial/vendor/modernc.org/ccgo/v3/lib/util.go

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// Copyright 2020 The CCGO Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// generator.go helpers
package ccgo // import "modernc.org/ccgo/v3/lib"
import (
"archive/tar"
"bufio"
"bytes"
"compress/gzip"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"runtime/debug"
"strings"
)
// CopyFile copies src to dest, preserving permissions and times where/when
// possible. If canOverwrite is not nil, it is consulted whether a destination
// file can be overwritten. If canOverwrite is nil then destination is
// overwritten if permissions allow that, otherwise the function fails.
//
// Src and dst must be in the slash form.
func CopyFile(dst, src string, canOverwrite func(fn string, fi os.FileInfo) bool) (n int64, rerr error) {
dst = filepath.FromSlash(dst)
dstDir := filepath.Dir(dst)
di, err := os.Stat(dstDir)
switch {
case err != nil:
if !os.IsNotExist(err) {
return 0, err
}
if err := os.MkdirAll(dstDir, 0770); err != nil {
return 0, err
}
case err == nil:
if !di.IsDir() {
return 0, fmt.Errorf("cannot create directory, file exists: %s", dst)
}
}
src = filepath.FromSlash(src)
si, err := os.Stat(src)
if err != nil {
return 0, err
}
if si.IsDir() {
return 0, fmt.Errorf("cannot copy a directory: %s", src)
}
di, err = os.Stat(dst)
switch {
case err != nil && !os.IsNotExist(err):
return 0, err
case err == nil:
if di.IsDir() {
return 0, fmt.Errorf("cannot overwite a directory: %s", dst)
}
if canOverwrite != nil && !canOverwrite(dst, di) {
return 0, fmt.Errorf("cannot overwite: %s", dst)
}
}
s, err := os.Open(src)
if err != nil {
return 0, err
}
defer s.Close()
r := bufio.NewReader(s)
d, err := os.Create(dst)
defer func() {
if err := d.Close(); err != nil && rerr == nil {
rerr = err
return
}
if err := os.Chmod(dst, si.Mode()); err != nil && rerr == nil {
rerr = err
return
}
if err := os.Chtimes(dst, si.ModTime(), si.ModTime()); err != nil && rerr == nil {
rerr = err
return
}
}()
w := bufio.NewWriter(d)
defer func() {
if err := w.Flush(); err != nil && rerr == nil {
rerr = err
}
}()
return io.Copy(w, r)
}
// MustCopyFile is like CopyFile but it executes Fatal(stackTrace, err) if it fails.
func MustCopyFile(stackTrace bool, dst, src string, canOverwrite func(fn string, fi os.FileInfo) bool) int64 {
n, err := CopyFile(dst, src, canOverwrite)
if err != nil {
Fatal(stackTrace, err)
}
return n
}
// CopyDir recursively copies src to dest, preserving permissions and times
// where/when possible. If canOverwrite is not nil, it is consulted whether a
// destination file can be overwritten. If canOverwrite is nil then destination
// is overwritten if permissions allow that, otherwise the function fails.
//
// Src and dst must be in the slash form.
func CopyDir(dst, src string, canOverwrite func(fn string, fi os.FileInfo) bool) (files int, bytes int64, rerr error) {
dst = filepath.FromSlash(dst)
src = filepath.FromSlash(src)
si, err := os.Stat(src)
if err != nil {
return 0, 0, err
}
if !si.IsDir() {
return 0, 0, fmt.Errorf("cannot copy a file: %s", src)
}
return files, bytes, filepath.Walk(src, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
rel, err := filepath.Rel(src, path)
if err != nil {
return err
}
if info.IsDir() {
return os.MkdirAll(filepath.Join(dst, rel), 0770)
}
n, err := CopyFile(filepath.Join(dst, rel), path, canOverwrite)
if err != nil {
return err
}
files++
bytes += n
return nil
})
}
// MustCopyDir is like CopyDir, but it executes Fatal(stackTrace, errú if it fails.
func MustCopyDir(stackTrace bool, dst, src string, canOverwrite func(fn string, fi os.FileInfo) bool) (files int, bytes int64) {
file, bytes, err := CopyDir(dst, src, canOverwrite)
if err != nil {
Fatal(stackTrace, err)
}
return file, bytes
}
// UntarFile extracts a named tar.gz archive into dst. If canOverwrite is not
// nil, it is consulted whether a destination file can be overwritten. If
// canOverwrite is nil then destination is overwritten if permissions allow
// that, otherwise the function fails.
//
// Src and dst must be in the slash form.
func UntarFile(dst, src string, canOverwrite func(fn string, fi os.FileInfo) bool) error {
f, err := os.Open(filepath.FromSlash(src))
if err != nil {
return err
}
defer f.Close()
return Untar(dst, bufio.NewReader(f), canOverwrite)
}
// MustUntarFile is like UntarFile but it executes Fatal(stackTrace, err) if it fails.
func MustUntarFile(stackTrace bool, dst, src string, canOverwrite func(fn string, fi os.FileInfo) bool) {
if err := UntarFile(dst, src, canOverwrite); err != nil {
Fatal(stackTrace, err)
}
}
// Untar extracts a tar.gz archive into dst. If canOverwrite is not nil, it is
// consulted whether a destination file can be overwritten. If canOverwrite is
// nil then destination is overwritten if permissions allow that, otherwise the
// function fails.
//
// Dst must be in the slash form.
func Untar(dst string, r io.Reader, canOverwrite func(fn string, fi os.FileInfo) bool) error {
dst = filepath.FromSlash(dst)
gr, err := gzip.NewReader(r)
if err != nil {
return err
}
tr := tar.NewReader(gr)
for {
hdr, err := tr.Next()
if err != nil {
if err != io.EOF {
return err
}
return nil
}
switch hdr.Typeflag {
case tar.TypeDir:
dir := filepath.Join(dst, hdr.Name)
if err = os.MkdirAll(dir, 0770); err != nil {
return err
}
case tar.TypeSymlink, tar.TypeXGlobalHeader:
// skip
case tar.TypeReg, tar.TypeRegA:
dir := filepath.Dir(filepath.Join(dst, hdr.Name))
if _, err := os.Stat(dir); err != nil {
if !os.IsNotExist(err) {
return err
}
if err = os.MkdirAll(dir, 0770); err != nil {
return err
}
}
fn := filepath.Join(dst, hdr.Name)
f, err := os.OpenFile(fn, os.O_CREATE|os.O_WRONLY, os.FileMode(hdr.Mode))
if err != nil {
return err
}
w := bufio.NewWriter(f)
if _, err = io.Copy(w, tr); err != nil {
return err
}
if err := w.Flush(); err != nil {
return err
}
if err := f.Close(); err != nil {
return err
}
if err := os.Chtimes(fn, hdr.AccessTime, hdr.ModTime); err != nil {
return err
}
default:
return fmt.Errorf("unexpected tar header typeflag %#02x", hdr.Typeflag)
}
}
}
// MustUntar is like Untar but it executes Fatal(stackTrace, err) if it fails.
func MustUntar(stackTrace bool, dst string, r io.Reader, canOverwrite func(fn string, fi os.FileInfo) bool) {
if err := Untar(dst, r, canOverwrite); err != nil {
Fatal(stackTrace, err)
}
}
// Fatalf prints a formatted message to os.Stderr and performs os.Exit(1). A
// stack trace is added if stackTrace is true.
func Fatalf(stackTrace bool, s string, args ...interface{}) {
if stackTrace {
fmt.Fprintf(os.Stderr, "%s\n", debug.Stack())
}
fmt.Fprintln(os.Stderr, strings.TrimSpace(fmt.Sprintf(s, args...)))
os.Exit(1)
}
// Fatal prints its argumenst to os.Stderr and performs os.Exit(1). A
// stack trace is added if stackTrace is true.
func Fatal(stackTrace bool, args ...interface{}) {
if stackTrace {
fmt.Fprintf(os.Stderr, "%s\n", debug.Stack())
}
fmt.Fprintln(os.Stderr, strings.TrimSpace(fmt.Sprint(args...)))
os.Exit(1)
}
// Mkdirs will create all paths. Paths must be in slash form.
func Mkdirs(paths ...string) error {
for _, path := range paths {
path = filepath.FromSlash(path)
if err := os.MkdirAll(path, 0770); err != nil {
return err
}
}
return nil
}
// MustMkdirs is like Mkdir but if executes Fatal(stackTrace, err) if it fails.
func MustMkdirs(stackTrace bool, paths ...string) {
if err := Mkdirs(paths...); err != nil {
Fatal(stackTrace, err)
}
}
// InDir executes f in dir. Dir must be in slash form.
func InDir(dir string, f func() error) (err error) {
var cwd string
if cwd, err = os.Getwd(); err != nil {
return err
}
defer func() {
if err2 := os.Chdir(cwd); err2 != nil {
err = err2
}
}()
if err = os.Chdir(filepath.FromSlash(dir)); err != nil {
return err
}
return f()
}
// MustInDir is like InDir but it executes Fatal(stackTrace, err) if it fails.
func MustInDir(stackTrace bool, dir string, f func() error) {
if err := InDir(dir, f); err != nil {
Fatal(stackTrace, err)
}
}
type echoWriter struct {
w bytes.Buffer
}
func (w *echoWriter) Write(b []byte) (int, error) {
os.Stdout.Write(b)
return w.w.Write(b)
}
// Shell echoes and executes cmd with args and returns the combined output if the command.
func Shell(cmd string, args ...string) ([]byte, error) {
cmd, err := exec.LookPath(cmd)
if err != nil {
return nil, err
}
wd, err := AbsCwd()
if err != nil {
return nil, err
}
fmt.Printf("execute %s %q in %s\n", cmd, args, wd)
var b echoWriter
c := exec.Command(cmd, args...)
c.Stdout = &b
c.Stderr = &b
err = c.Run()
return b.w.Bytes(), err
}
// MustShell is like Shell but it executes Fatal(stackTrace, err) if it fails.
func MustShell(stackTrace bool, cmd string, args ...string) []byte {
b, err := Shell(cmd, args...)
if err != nil {
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Fatalf(stackTrace, "%v %s\noutput: %s\nerr: %s", cmd, args, b, err)
}
return b
}
// Compile executes Shell with cmd set to "ccgo".
func Compile(args ...string) ([]byte, error) { return Shell("ccgo", args...) }
// MustCompile is like Compile but if executes Fatal(stackTrace, err) if it fails.
func MustCompile(stackTrace bool, args ...string) []byte {
return MustShell(stackTrace, "ccgo", args...)
}
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// Run is like Compile, but executes in-process.
func Run(args ...string) ([]byte, error) {
var b bytes.Buffer
t := NewTask(append([]string{"ccgo"}, args...), &b, &b)
err := t.Main()
return b.Bytes(), err
}
// MustRun is like Run but if executes Fatal(stackTrace, err) if it fails.
func MustRun(stackTrace bool, args ...string) []byte {
var b bytes.Buffer
args = append([]string{"ccgo"}, args...)
t := NewTask(args, &b, &b)
if err := t.Main(); err != nil {
Fatalf(stackTrace, "%v\noutput: %s\nerr: %s", args, b.Bytes(), err)
}
return b.Bytes()
}
// AbsCwd returns the absolute working directory.
func AbsCwd() (string, error) {
wd, err := os.Getwd()
if err != nil {
return "", err
}
if wd, err = filepath.Abs(wd); err != nil {
return "", err
}
return wd, nil
}
// MustAbsCwd is like AbsCwd but executes Fatal(stackTrace, err) if it fails.
func MustAbsCwd(stackTrace bool) string {
s, err := AbsCwd()
if err != nil {
Fatal(stackTrace, err)
}
return s
}
// Env returns the value of environmental variable key of dflt otherwise.
func Env(key, dflt string) string {
if s := os.Getenv(key); s != "" {
return s
}
return dflt
}
// MustTempDir is like ioutil.TempDir but executes Fatal(stackTrace, err) if it
// fails. The returned path is absolute.
func MustTempDir(stackTrace bool, dir, name string) string {
s, err := ioutil.TempDir(dir, name)
if err != nil {
Fatal(stackTrace, err)
}
if s, err = filepath.Abs(s); err != nil {
Fatal(stackTrace, err)
}
return s
}