116 lines
2.2 KiB
Go
116 lines
2.2 KiB
Go
package configload
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import (
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"io"
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"os"
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"path/filepath"
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)
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// copyDir copies the src directory contents into dst. Both directories
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// should already exist.
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func copyDir(dst, src string) error {
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src, err := filepath.EvalSymlinks(src)
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if err != nil {
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return err
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}
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walkFn := 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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if path == src {
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return nil
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}
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// The "path" has the src prefixed to it. We need to join our
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// destination with the path without the src on it.
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dstPath := filepath.Join(dst, path[len(src):])
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// we don't want to try and copy the same file over itself.
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if eq, err := sameFile(path, dstPath); eq {
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return nil
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} else if err != nil {
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return err
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}
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// If we have a directory, make that subdirectory, then continue
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// the walk.
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if info.IsDir() {
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if path == filepath.Join(src, dst) {
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// dst is in src; don't walk it.
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return nil
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}
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if err := os.MkdirAll(dstPath, 0755); err != nil {
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return err
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}
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return nil
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}
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// If the current path is a symlink, recreate the symlink relative to
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// the dst directory
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if info.Mode()&os.ModeSymlink == os.ModeSymlink {
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target, err := os.Readlink(path)
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if err != nil {
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return err
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}
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return os.Symlink(target, dstPath)
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}
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// If we have a file, copy the contents.
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srcF, err := os.Open(path)
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if err != nil {
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return err
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}
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defer srcF.Close()
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dstF, err := os.Create(dstPath)
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if err != nil {
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return err
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}
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defer dstF.Close()
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if _, err := io.Copy(dstF, srcF); err != nil {
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return err
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}
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// Chmod it
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return os.Chmod(dstPath, info.Mode())
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}
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return filepath.Walk(src, walkFn)
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}
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// sameFile tried to determine if to paths are the same file.
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// If the paths don't match, we lookup the inode on supported systems.
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func sameFile(a, b string) (bool, error) {
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if a == b {
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return true, nil
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}
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aIno, err := inode(a)
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if err != nil {
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if os.IsNotExist(err) {
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return false, nil
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}
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return false, err
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}
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bIno, err := inode(b)
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if err != nil {
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if os.IsNotExist(err) {
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return false, nil
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}
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return false, err
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}
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if aIno > 0 && aIno == bIno {
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return true, nil
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}
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return false, nil
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}
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