150 lines
3.4 KiB
Go
150 lines
3.4 KiB
Go
// Copyright 2018 The Prometheus 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 fileutil provides utility methods used when dealing with the filesystem in tsdb.
|
|
// It is largely copied from github.com/coreos/etcd/pkg/fileutil to avoid the
|
|
// dependency chain it brings with it.
|
|
// Please check github.com/coreos/etcd for licensing information.
|
|
package fileutil
|
|
|
|
import (
|
|
"io/ioutil"
|
|
"os"
|
|
"path/filepath"
|
|
"sort"
|
|
"strings"
|
|
)
|
|
|
|
// CopyDirs copies all directories, subdirectories and files recursively including the empty folders.
|
|
// Source and destination must be full paths.
|
|
func CopyDirs(src, dest string) error {
|
|
if err := os.MkdirAll(dest, 0777); err != nil {
|
|
return err
|
|
}
|
|
files, err := readDirs(src)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
for _, f := range files {
|
|
dp := filepath.Join(dest, f)
|
|
sp := filepath.Join(src, f)
|
|
|
|
stat, err := os.Stat(sp)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Empty directories are also created.
|
|
if stat.IsDir() {
|
|
if err := os.MkdirAll(dp, 0777); err != nil {
|
|
return err
|
|
}
|
|
continue
|
|
}
|
|
|
|
if err := copyFile(sp, dp); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func copyFile(src, dest string) error {
|
|
data, err := ioutil.ReadFile(src)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
err = ioutil.WriteFile(dest, data, 0644)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// readDirs reads the source directory recursively and
|
|
// returns relative paths to all files and empty directories.
|
|
func readDirs(src string) ([]string, error) {
|
|
var files []string
|
|
|
|
err := filepath.Walk(src, func(path string, f os.FileInfo, err error) error {
|
|
relativePath := strings.TrimPrefix(path, src)
|
|
if len(relativePath) > 0 {
|
|
files = append(files, relativePath)
|
|
}
|
|
return nil
|
|
})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return files, nil
|
|
}
|
|
|
|
// 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
|
|
}
|
|
|
|
// Rename safely renames a file.
|
|
func Rename(from, to string) error {
|
|
if err := os.Rename(from, to); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Directory was renamed; sync parent dir to persist rename.
|
|
pdir, err := OpenDir(filepath.Dir(to))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if err = pdir.Sync(); err != nil {
|
|
pdir.Close()
|
|
return err
|
|
}
|
|
return pdir.Close()
|
|
}
|
|
|
|
// Replace moves a file or directory to a new location and deletes any previous data.
|
|
// It is not atomic.
|
|
func Replace(from, to string) error {
|
|
if err := os.RemoveAll(to); err != nil {
|
|
return err
|
|
}
|
|
if err := os.Rename(from, to); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Directory was renamed; sync parent dir to persist rename.
|
|
pdir, err := OpenDir(filepath.Dir(to))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if err = pdir.Sync(); err != nil {
|
|
pdir.Close()
|
|
return err
|
|
}
|
|
return pdir.Close()
|
|
}
|