| // Copyright 2015 CoreOS, Inc. |
| // |
| // 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 fileutil |
| |
| import ( |
| "io/ioutil" |
| "os" |
| "path" |
| "sort" |
| |
| "github.com/coreos/pkg/capnslog" |
| ) |
| |
| const ( |
| privateFileMode = 0600 |
| ) |
| |
| var ( |
| plog = capnslog.NewPackageLogger("github.com/coreos/etcd/pkg", "fileutil") |
| ) |
| |
| // IsDirWriteable checks if dir is writable by writing and removing a file |
| // to dir. It returns nil if dir is writable. |
| func IsDirWriteable(dir string) error { |
| f := path.Join(dir, ".touch") |
| if err := ioutil.WriteFile(f, []byte(""), privateFileMode); err != nil { |
| return err |
| } |
| return os.Remove(f) |
| } |
| |
| // ReadDir returns the filenames in the given directory in sorted order. |
| func ReadDir(dirpath string) ([]string, error) { |
| dir, err := os.Open(dirpath) |
| if err != nil { |
| return nil, err |
| } |
| defer dir.Close() |
| names, err := dir.Readdirnames(-1) |
| if err != nil { |
| return nil, err |
| } |
| sort.Strings(names) |
| return names, nil |
| } |