150 lines
3.4 KiB
Go
150 lines
3.4 KiB
Go
// Copyright 2018 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package fileutil provides utility methods used when dealing with the filesystem in tsdb.
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// It is largely copied from github.com/coreos/etcd/pkg/fileutil to avoid the
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// dependency chain it brings with it.
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// Please check github.com/coreos/etcd for licensing information.
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package fileutil
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import (
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"io/ioutil"
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"os"
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"path/filepath"
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"sort"
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"strings"
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)
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// CopyDirs copies all directories, subdirectories and files recursively including the empty folders.
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// Source and destination must be full paths.
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func CopyDirs(src, dest string) error {
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if err := os.MkdirAll(dest, 0777); err != nil {
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return err
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}
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files, err := readDirs(src)
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if err != nil {
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return err
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}
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for _, f := range files {
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dp := filepath.Join(dest, f)
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sp := filepath.Join(src, f)
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stat, err := os.Stat(sp)
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if err != nil {
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return err
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}
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// Empty directories are also created.
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if stat.IsDir() {
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if err := os.MkdirAll(dp, 0777); err != nil {
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return err
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}
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continue
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}
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if err := copyFile(sp, dp); err != nil {
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return err
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}
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}
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return nil
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}
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func copyFile(src, dest string) error {
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data, err := ioutil.ReadFile(src)
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if err != nil {
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return err
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}
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err = ioutil.WriteFile(dest, data, 0644)
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if err != nil {
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return err
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}
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return nil
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}
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// readDirs reads the source directory recursively and
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// returns relative paths to all files and empty directories.
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func readDirs(src string) ([]string, error) {
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var files []string
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err := filepath.Walk(src, func(path string, f os.FileInfo, err error) error {
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relativePath := strings.TrimPrefix(path, src)
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if len(relativePath) > 0 {
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files = append(files, relativePath)
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}
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return nil
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})
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if err != nil {
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return nil, err
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}
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return files, nil
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}
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// ReadDir returns the filenames in the given directory in sorted order.
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func ReadDir(dirpath string) ([]string, error) {
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dir, err := os.Open(dirpath)
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if err != nil {
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return nil, err
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}
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defer dir.Close()
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names, err := dir.Readdirnames(-1)
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if err != nil {
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return nil, err
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}
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sort.Strings(names)
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return names, nil
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}
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// Rename safely renames a file.
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func Rename(from, to string) error {
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if err := os.Rename(from, to); err != nil {
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return err
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}
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// Directory was renamed; sync parent dir to persist rename.
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pdir, err := OpenDir(filepath.Dir(to))
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if err != nil {
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return err
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}
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if err = Fsync(pdir); err != nil {
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pdir.Close()
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return err
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}
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return pdir.Close()
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}
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// Replace moves a file or directory to a new location and deletes any previous data.
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// It is not atomic.
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func Replace(from, to string) error {
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if err := os.RemoveAll(to); err != nil {
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return err
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}
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if err := os.Rename(from, to); err != nil {
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return err
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}
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// Directory was renamed; sync parent dir to persist rename.
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pdir, err := OpenDir(filepath.Dir(to))
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if err != nil {
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return err
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}
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if err = Fsync(pdir); err != nil {
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pdir.Close()
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return err
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}
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return pdir.Close()
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}
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