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