62 lines
1.2 KiB
Go
62 lines
1.2 KiB
Go
package base
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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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"syscall"
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"github.com/vbatts/dedupe-linker/file"
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)
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// FindBase steps up the directory tree to find the top-level that is still on
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// the same device as the path provided
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func FindBase(path string) (string, error) {
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stat, err := os.Lstat(path)
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if err != nil {
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return "", err
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}
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if stat.IsDir() {
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return findBaseInfo(stat)
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}
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return FindBase(filepath.Dir(path))
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}
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func findBaseInfo(stat os.FileInfo) (string, error) {
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dirstat, err := os.Lstat(filepath.Dir(stat.Name()))
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if err != nil {
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return "", err
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}
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if stat.Name() == dirstat.Name() {
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return stat.Name(), nil
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}
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if sameDevice(stat, dirstat) {
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return findBaseInfo(dirstat)
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}
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return stat.Name(), nil
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}
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func hasPermission(path string) bool {
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stat, err := os.Lstat(path)
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if err != nil {
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return false
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}
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if !stat.IsDir() {
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path = filepath.Dir(path)
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}
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fh, err := ioutil.TempFile(path, "perm.test.")
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if err != nil {
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return false
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}
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os.Remove(fh.Name())
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return true
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}
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func sameDevice(file1, file2 os.FileInfo) bool {
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sys1 := file1.Sys().(*syscall.Stat_t)
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sys2 := file2.Sys().(*syscall.Stat_t)
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return ((file.MajorDev(sys1.Dev) == file.MajorDev(sys2.Dev)) && (file.MinorDev(sys1.Dev) == file.MinorDev(sys2.Dev)))
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}
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