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