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package util
import (
"io/fs"
"os"
"strings"
"syscall"
"codeberg.org/gruf/go-fastpath"
)
var dotdot = "../"
// CountDotdots returns the number of "dot-dots" (../) in a cleaned filesystem path
func CountDotdots(path string) int {
if !strings.HasSuffix(path, dotdot) {
return 0
}
return strings.Count(path, dotdot)
}
// WalkDir traverses the dir tree of the supplied path, performing the supplied walkFn on each entry
func WalkDir(pb *fastpath.Builder, path string, walkFn func(string, fs.DirEntry)) error {
// Read supplied dir path
dirEntries, err := os.ReadDir(path)
if err != nil {
return err
}
// Iter entries
for _, entry := range dirEntries {
// Pass to walk fn
walkFn(path, entry)
// Recurse dir entries
if entry.IsDir() {
err = WalkDir(pb, pb.Join(path, entry.Name()), walkFn)
if err != nil {
return err
}
}
}
return nil
}
// CleanDirs traverses the dir tree of the supplied path, removing any folders with zero children
func CleanDirs(path string) error {
// Acquire builder
pb := GetPathBuilder()
defer PutPathBuilder(pb)
// Get dir entries
entries, err := os.ReadDir(path)
if err != nil {
return err
}
// Recurse dirs
for _, entry := range entries {
if entry.IsDir() {
err := cleanDirs(pb, pb.Join(path, entry.Name()))
if err != nil {
return err
}
}
}
return nil
}
// cleanDirs performs the actual dir cleaning logic for the exported version
func cleanDirs(pb *fastpath.Builder, path string) error {
// Get dir entries
entries, err := os.ReadDir(path)
if err != nil {
return err
}
// If no entries, delete
if len(entries) < 1 {
return os.Remove(path)
}
// Recurse dirs
for _, entry := range entries {
if entry.IsDir() {
err := cleanDirs(pb, pb.Join(path, entry.Name()))
if err != nil {
return err
}
}
}
return nil
}
// RetryOnEINTR is a low-level filesystem function for retrying syscalls on O_EINTR received
func RetryOnEINTR(do func() error) error {
for {
err := do()
if err == syscall.EINTR {
continue
}
return err
}
}
|
