138 lines
3.7 KiB
Go
138 lines
3.7 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package fs
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import (
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"io/ioutil"
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"os"
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"path/filepath"
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"sync"
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"github.com/pkg/errors"
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)
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var bufferPool = &sync.Pool{
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New: func() interface{} {
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buffer := make([]byte, 32*1024)
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return &buffer
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},
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}
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// CopyDir copies the directory from src to dst.
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// Most efficient copy of files is attempted.
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func CopyDir(dst, src string) error {
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inodes := map[uint64]string{}
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return copyDirectory(dst, src, inodes)
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}
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func copyDirectory(dst, src string, inodes map[uint64]string) error {
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stat, err := os.Stat(src)
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if err != nil {
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return errors.Wrapf(err, "failed to stat %s", src)
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}
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if !stat.IsDir() {
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return errors.Errorf("source is not directory")
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}
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if st, err := os.Stat(dst); err != nil {
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if err := os.Mkdir(dst, stat.Mode()); err != nil {
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return errors.Wrapf(err, "failed to mkdir %s", dst)
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}
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} else if !st.IsDir() {
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return errors.Errorf("cannot copy to non-directory: %s", dst)
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} else {
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if err := os.Chmod(dst, stat.Mode()); err != nil {
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return errors.Wrapf(err, "failed to chmod on %s", dst)
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}
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}
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fis, err := ioutil.ReadDir(src)
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if err != nil {
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return errors.Wrapf(err, "failed to read %s", src)
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}
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if err := copyFileInfo(stat, dst); err != nil {
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return errors.Wrapf(err, "failed to copy file info for %s", dst)
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}
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for _, fi := range fis {
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source := filepath.Join(src, fi.Name())
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target := filepath.Join(dst, fi.Name())
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switch {
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case fi.IsDir():
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if err := copyDirectory(target, source, inodes); err != nil {
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return err
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}
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continue
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case (fi.Mode() & os.ModeType) == 0:
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link, err := getLinkSource(target, fi, inodes)
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if err != nil {
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return errors.Wrap(err, "failed to get hardlink")
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}
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if link != "" {
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if err := os.Link(link, target); err != nil {
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return errors.Wrap(err, "failed to create hard link")
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}
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} else if err := CopyFile(target, source); err != nil {
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return errors.Wrap(err, "failed to copy files")
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}
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case (fi.Mode() & os.ModeSymlink) == os.ModeSymlink:
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link, err := os.Readlink(source)
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if err != nil {
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return errors.Wrapf(err, "failed to read link: %s", source)
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}
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if err := os.Symlink(link, target); err != nil {
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return errors.Wrapf(err, "failed to create symlink: %s", target)
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}
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case (fi.Mode() & os.ModeDevice) == os.ModeDevice:
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if err := copyDevice(target, fi); err != nil {
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return errors.Wrapf(err, "failed to create device")
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}
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default:
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// TODO: Support pipes and sockets
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return errors.Wrapf(err, "unsupported mode %s", fi.Mode())
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}
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if err := copyFileInfo(fi, target); err != nil {
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return errors.Wrap(err, "failed to copy file info")
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}
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if err := copyXAttrs(target, source); err != nil {
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return errors.Wrap(err, "failed to copy xattrs")
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}
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}
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return nil
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}
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// CopyFile copies the source file to the target.
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// The most efficient means of copying is used for the platform.
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func CopyFile(target, source string) error {
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src, err := os.Open(source)
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if err != nil {
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return errors.Wrapf(err, "failed to open source %s", source)
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}
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defer src.Close()
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tgt, err := os.Create(target)
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if err != nil {
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return errors.Wrapf(err, "failed to open target %s", target)
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}
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defer tgt.Close()
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return copyFileContent(tgt, src)
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}
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