/
aferoutils.go
92 lines (75 loc) · 1.89 KB
/
aferoutils.go
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//
// Copyright 2020 The AVFS authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package avfs
import (
"errors"
"fmt"
"io/fs"
"os"
)
// DirExists checks if a path exists and is a directory.
func DirExists(vfs VFSBase, path string) (bool, error) {
fi, err := vfs.Stat(path)
if err == nil && fi.IsDir() {
return true, nil
}
if errors.Is(err, fs.ErrNotExist) {
return false, nil
}
return false, err
}
// Exists Check if a file or directory exists.
func Exists(vfs VFSBase, path string) (bool, error) {
_, err := vfs.Stat(path)
if err == nil {
return true, nil
}
if errors.Is(err, fs.ErrNotExist) {
return false, nil
}
return false, err
}
// IsDir checks if a given path is a directory.
func IsDir(vfs VFSBase, path string) (bool, error) {
fi, err := vfs.Stat(path)
if err != nil {
return false, err
}
return fi.IsDir(), nil
}
// IsEmpty checks if a given file or directory is empty.
func IsEmpty(vfs VFSBase, path string) (bool, error) {
if b, _ := Exists(vfs, path); !b {
return false, fmt.Errorf("%q path does not exist", path)
}
fi, err := vfs.Stat(path)
if err != nil {
return false, err
}
if fi.IsDir() {
f, err := vfs.OpenFile(path, os.O_RDONLY, 0)
if err != nil {
return false, err
}
defer f.Close()
list, err := f.ReadDir(-1)
if err != nil {
return false, err
}
return len(list) == 0, nil
}
return fi.Size() == 0, nil
}