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package fileutils
import (
"errors"
"os"
"syscall"
"golang.org/x/sys/unix"
)
// Exists checks whether a file or directory exists at the given path.
// If the path is a symlink, the symlink is followed.
func Exists(path string) error {
// It uses unix.Faccessat which is a faster operation compared to os.Stat for
// simply checking the existence of a file.
err := unix.Faccessat(unix.AT_FDCWD, path, unix.F_OK, 0)
if err != nil {
return &os.PathError{Op: "faccessat", Path: path, Err: err}
}
return nil
}
// Lexists checks whether a file or directory exists at the given path.
// If the path is a symlink, the symlink itself is checked.
func Lexists(path string) error {
// FreeBSD before 15.0 does not support the AT_SYMLINK_NOFOLLOW flag for
// faccessat. In this case, the call to faccessat will return EINVAL and
// we fall back to using Lstat.
err := unix.Faccessat(unix.AT_FDCWD, path, unix.F_OK, unix.AT_SYMLINK_NOFOLLOW)
if err != nil {
if errors.Is(err, syscall.EINVAL) {
_, err = os.Lstat(path)
return err
}
return &os.PathError{Op: "faccessat", Path: path, Err: err}
}
return nil
}
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