node: switching prometheus flock location to tsdb (#19376)

* node: switching prometheus flock location to tsdb

* rookie mistake

vendor/github.com/prometheus/tsdb/fileutil/fileutil.go

@@ -0,0 +1,149 @@
+// 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 = Fsync(pdir); 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 = Fsync(pdir); err != nil {
+		pdir.Close()
+		return err
+	}
+	return pdir.Close()
+}