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fileutil.go
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fileutil.go
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// 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 implements utility functions related to files and paths.
package fileutil
import (
"io/ioutil"
"os"
"path"
"sort"
"github.com/coreos/etcd/Godeps/_workspace/src/github.com/coreos/pkg/capnslog"
)
const (
privateFileMode = 0600
// owner can make/remove files inside the directory
privateDirMode = 0700
)
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
}
// TouchDirAll is similar to os.MkdirAll. It creates directories with 0700 permission if any directory
// does not exists. TouchDirAll also ensures the given directory is writable.
func TouchDirAll(dir string) error {
err := os.MkdirAll(dir, privateDirMode)
if err != nil && err != os.ErrExist {
return err
}
return IsDirWriteable(dir)
}
func Exist(name string) bool {
_, err := os.Stat(name)
return err == nil
}