122 lines
2.2 KiB
Go
122 lines
2.2 KiB
Go
package copy
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import (
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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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"path/filepath"
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)
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// From: https://gist.github.com/m4ng0squ4sh/92462b38df26839a3ca324697c8cba04
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// CopyFile copies the contents of the file named src to the file named
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// by dst. The file will be created if it does not already exist. If the
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// destination file exists, all it's contents will be replaced by the contents
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// of the source file. The file mode will be copied from the source and
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// the copied data is synced/flushed to stable storage.
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func CopyFile(src, dst string) (err error) {
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in, err := os.Open(src)
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if err != nil {
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return
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}
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defer in.Close()
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out, err := os.Create(dst)
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if err != nil {
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return
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}
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defer func() {
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if e := out.Close(); e != nil {
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err = e
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}
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}()
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_, err = io.Copy(out, in)
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if err != nil {
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return
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}
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err = out.Sync()
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if err != nil {
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return
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}
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si, err := os.Stat(src)
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if err != nil {
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return
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}
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err = os.Chmod(dst, si.Mode())
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if err != nil {
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return
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}
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return
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}
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// CopyDir recursively copies a directory tree, attempting to preserve permissions.
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// Source directory must exist, destination directory must *not* exist.
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// Symlinks are ignored and skipped.
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func CopyDir(src string, dst string) (err error) {
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src = filepath.Clean(src)
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dst = filepath.Clean(dst)
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si, err := os.Stat(src)
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if err != nil {
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return err
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}
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if !si.IsDir() {
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return fmt.Errorf("source is not a directory")
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}
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_, err = os.Stat(dst)
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if err != nil && !os.IsNotExist(err) {
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return
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}
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if err == nil {
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return fmt.Errorf("destination already exists")
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}
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err = os.MkdirAll(dst, si.Mode())
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if err != nil {
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return
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}
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entries, err := ioutil.ReadDir(src)
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if err != nil {
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return
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}
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for _, entry := range entries {
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srcPath := filepath.Join(src, entry.Name())
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dstPath := filepath.Join(dst, entry.Name())
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// If the entry is a symlink, we copy the contents
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for entry.Mode()&os.ModeSymlink != 0 {
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target, err := os.Readlink(srcPath)
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if err != nil {
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return err
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}
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entry, err = os.Stat(target)
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if err != nil {
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return err
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}
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}
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if entry.IsDir() {
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err = CopyDir(srcPath, dstPath)
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if err != nil {
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return
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}
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} else {
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err = CopyFile(srcPath, dstPath)
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if err != nil {
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return
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}
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}
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}
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return
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}
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