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dups: symlink support
this came in handy for my talks repo Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
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0d414be0e7
commit
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1 changed files with 38 additions and 12 deletions
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@ -17,8 +17,9 @@ import (
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var (
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flLoadMap = flag.String("l", "", "load existing map from file")
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flSaveMap = flag.String("s", "hash-map.json", "file to save map of file hashes to")
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flSaveMap = flag.String("o", "hash-map.json", "file to save map of file hashes to")
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flHardlink = flag.Bool("H", false, "hardlink the duplicate files")
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flSymlink = flag.Bool("s", false, "symlink the duplicate files")
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flQuiet = flag.Bool("q", false, "less output")
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nprocs = 1
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)
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@ -93,11 +94,18 @@ func main() {
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fmt.Printf("%q is the same content as %q\n", path, fpath)
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}
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if *flHardlink {
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if err = SafeLink(fpath, path); err != nil {
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if err = SafeLink(fpath, path, true); err != nil {
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fmt.Fprintln(os.Stderr, err, path)
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return
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}
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fmt.Printf("linked %q to %q\n", path, fpath)
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fmt.Printf("hard linked %q to %q\n", path, fpath)
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}
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if *flSymlink {
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if err = SafeLink(fpath, path, false); err != nil {
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fmt.Fprintln(os.Stderr, err, path)
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return
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}
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fmt.Printf("soft linked %q to %q\n", path, fpath)
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}
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savings += info.Size()
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} else {
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@ -135,7 +143,7 @@ func main() {
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}
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// SafeLink overrides newname if it already exists. If there is an error in creating the link, the transaction is rolled back
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func SafeLink(oldname, newname string) error {
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func SafeLink(oldname, newname string, hard bool) error {
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var backupName string
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// check if newname exists
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if fi, err := os.Stat(newname); err == nil && fi != nil {
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@ -150,16 +158,34 @@ func SafeLink(oldname, newname string) error {
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return err
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}
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}
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// hardlink oldname to newname
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if err := os.Link(oldname, newname); err != nil {
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// if that failed, and there is a backupName
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if len(backupName) > 0 {
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// then move back the backup
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if err = os.Rename(backupName, newname); err != nil {
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return err
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if hard {
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// hardlink oldname to newname
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if err := os.Link(oldname, newname); err != nil {
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// if that failed, and there is a backupName
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if len(backupName) > 0 {
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// then move back the backup
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if err = os.Rename(backupName, newname); err != nil {
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return err
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}
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}
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return err
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}
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} else {
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// symlink
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relpath, err := filepath.Rel(filepath.Dir(newname), oldname)
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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(relpath, newname); err != nil {
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// if that failed, and there is a backupName
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if len(backupName) > 0 {
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// then move back the backup
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if err = os.Rename(backupName, newname); err != nil {
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return err
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}
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}
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return err
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}
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return err
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}
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// remove the backupName
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if len(backupName) > 0 {
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