159 lines
3.3 KiB
Go
159 lines
3.3 KiB
Go
package fileutils
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import (
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"fmt"
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"io"
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"os"
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"path/filepath"
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"syscall"
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)
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// CopyFile copies the file at source to dest
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func CopyFile(source string, dest string) error {
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si, err := os.Lstat(source)
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if err != nil {
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return err
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}
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st, ok := si.Sys().(*syscall.Stat_t)
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if !ok {
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return fmt.Errorf("could not convert to syscall.Stat_t")
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}
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uid := int(st.Uid)
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gid := int(st.Gid)
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// Handle symlinks
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if si.Mode()&os.ModeSymlink != 0 {
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target, err := os.Readlink(source)
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if err != nil {
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return err
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}
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if err := os.Symlink(target, dest); err != nil {
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return err
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}
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}
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// Handle device files
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if st.Mode&syscall.S_IFMT == syscall.S_IFBLK || st.Mode&syscall.S_IFMT == syscall.S_IFCHR {
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devMajor := int64(major(uint64(st.Rdev)))
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devMinor := int64(minor(uint64(st.Rdev)))
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mode := uint32(si.Mode() & 07777)
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if st.Mode&syscall.S_IFMT == syscall.S_IFBLK {
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mode |= syscall.S_IFBLK
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}
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if st.Mode&syscall.S_IFMT == syscall.S_IFCHR {
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mode |= syscall.S_IFCHR
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}
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if err := syscall.Mknod(dest, mode, int(mkdev(devMajor, devMinor))); err != nil {
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return err
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}
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}
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// Handle regular files
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if si.Mode().IsRegular() {
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sf, err := os.Open(source)
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if err != nil {
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return err
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}
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defer sf.Close()
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df, err := os.Create(dest)
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if err != nil {
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return err
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}
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defer df.Close()
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_, err = io.Copy(df, sf)
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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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// Chown the file
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if err := os.Lchown(dest, uid, gid); err != nil {
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return err
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}
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// Chmod the file
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if !(si.Mode()&os.ModeSymlink == os.ModeSymlink) {
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if err := os.Chmod(dest, si.Mode()); 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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// CopyDirectory copies the files under the source directory
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// to dest directory. The dest directory is created if it
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// does not exist.
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func CopyDirectory(source string, dest string) error {
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fi, err := os.Stat(source)
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if err != nil {
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return err
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}
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// Get owner.
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st, ok := fi.Sys().(*syscall.Stat_t)
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if !ok {
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return fmt.Errorf("could not convert to syscall.Stat_t")
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}
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// We have to pick an owner here anyway.
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if err := MkdirAllNewAs(dest, fi.Mode(), int(st.Uid), int(st.Gid)); err != nil {
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return err
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}
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return filepath.Walk(source, 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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// Get the relative path
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relPath, err := filepath.Rel(source, path)
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if err != nil {
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return nil
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}
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if info.IsDir() {
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// Skip the source directory.
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if path != source {
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// Get the owner.
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st, ok := info.Sys().(*syscall.Stat_t)
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if !ok {
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return fmt.Errorf("could not convert to syscall.Stat_t")
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}
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uid := int(st.Uid)
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gid := int(st.Gid)
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if err := os.Mkdir(filepath.Join(dest, relPath), info.Mode()); err != nil {
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return err
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}
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if err := os.Lchown(filepath.Join(dest, relPath), uid, gid); 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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return CopyFile(path, filepath.Join(dest, relPath))
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})
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}
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// Gives a number indicating the device driver to be used to access the passed device
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func major(device uint64) uint64 {
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return (device >> 8) & 0xfff
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}
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// Gives a number that serves as a flag to the device driver for the passed device
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func minor(device uint64) uint64 {
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return (device & 0xff) | ((device >> 12) & 0xfff00)
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}
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func mkdev(major int64, minor int64) uint32 {
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return uint32(((minor & 0xfff00) << 12) | ((major & 0xfff) << 8) | (minor & 0xff))
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}
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