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459 lines
13 KiB
459 lines
13 KiB
/*
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* Minio Cloud Storage, (C) 2016 Minio, Inc.
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*
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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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*/
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package cmd
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import (
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"io"
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"os"
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pathutil "path"
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"runtime"
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)
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// Removes only the file at given path does not remove
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// any parent directories, handles long paths for
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// windows automatically.
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func fsRemoveFile(filePath string) (err error) {
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if filePath == "" {
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return traceError(errInvalidArgument)
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}
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if err = checkPathLength(filePath); err != nil {
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return traceError(err)
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}
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if err = os.Remove(preparePath(filePath)); err != nil {
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if os.IsNotExist(err) {
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return traceError(errFileNotFound)
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} else if os.IsPermission(err) {
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return traceError(errFileAccessDenied)
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}
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return traceError(err)
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}
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return nil
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}
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// Removes all files and folders at a given path, handles
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// long paths for windows automatically.
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func fsRemoveAll(dirPath string) (err error) {
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if dirPath == "" {
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return traceError(errInvalidArgument)
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}
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if err = checkPathLength(dirPath); err != nil {
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return traceError(err)
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}
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if err = removeAll(dirPath); err != nil {
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if os.IsPermission(err) {
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return traceError(errVolumeAccessDenied)
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}
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return traceError(err)
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}
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return nil
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}
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// Removes a directory only if its empty, handles long
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// paths for windows automatically.
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func fsRemoveDir(dirPath string) (err error) {
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if dirPath == "" {
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return traceError(errInvalidArgument)
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}
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if err = checkPathLength(dirPath); err != nil {
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return traceError(err)
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}
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if err = os.Remove(preparePath(dirPath)); err != nil {
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if os.IsNotExist(err) {
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return traceError(errVolumeNotFound)
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} else if isSysErrNotEmpty(err) {
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return traceError(errVolumeNotEmpty)
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}
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return traceError(err)
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}
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return nil
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}
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// Creates a new directory, parent dir should exist
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// otherwise returns an error. If directory already
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// exists returns an error. Windows long paths
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// are handled automatically.
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func fsMkdir(dirPath string) (err error) {
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if dirPath == "" {
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return traceError(errInvalidArgument)
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}
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if err = checkPathLength(dirPath); err != nil {
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return traceError(err)
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}
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if err = os.Mkdir(preparePath(dirPath), 0777); err != nil {
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if os.IsExist(err) {
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return traceError(errVolumeExists)
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} else if os.IsPermission(err) {
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return traceError(errDiskAccessDenied)
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} else if isSysErrNotDir(err) {
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// File path cannot be verified since
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// one of the parents is a file.
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return traceError(errDiskAccessDenied)
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} else if isSysErrPathNotFound(err) {
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// Add specific case for windows.
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return traceError(errDiskAccessDenied)
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}
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return traceError(err)
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}
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return nil
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}
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// Lookup if directory exists, returns directory
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// attributes upon success.
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func fsStatDir(statDir string) (os.FileInfo, error) {
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if statDir == "" {
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return nil, traceError(errInvalidArgument)
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}
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if err := checkPathLength(statDir); err != nil {
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return nil, traceError(err)
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}
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fi, err := osStat(preparePath(statDir))
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if err != nil {
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if os.IsNotExist(err) {
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return nil, traceError(errVolumeNotFound)
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} else if os.IsPermission(err) {
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return nil, traceError(errVolumeAccessDenied)
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}
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return nil, traceError(err)
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}
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if !fi.IsDir() {
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return nil, traceError(errVolumeAccessDenied)
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}
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return fi, nil
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}
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// Lookup if file exists, returns file attributes upon success
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func fsStatFile(statFile string) (os.FileInfo, error) {
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if statFile == "" {
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return nil, traceError(errInvalidArgument)
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}
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if err := checkPathLength(statFile); err != nil {
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return nil, traceError(err)
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}
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fi, err := osStat(preparePath(statFile))
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if err != nil {
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if os.IsNotExist(err) {
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return nil, traceError(errFileNotFound)
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} else if os.IsPermission(err) {
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return nil, traceError(errFileAccessDenied)
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} else if isSysErrNotDir(err) {
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return nil, traceError(errFileAccessDenied)
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} else if isSysErrPathNotFound(err) {
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return nil, traceError(errFileNotFound)
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}
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return nil, traceError(err)
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}
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if fi.IsDir() {
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return nil, traceError(errFileNotFound)
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}
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return fi, nil
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}
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// Opens the file at given path, optionally from an offset. Upon success returns
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// a readable stream and the size of the readable stream.
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func fsOpenFile(readPath string, offset int64) (io.ReadCloser, int64, error) {
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if readPath == "" || offset < 0 {
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return nil, 0, traceError(errInvalidArgument)
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}
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if err := checkPathLength(readPath); err != nil {
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return nil, 0, traceError(err)
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}
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fr, err := os.Open(preparePath(readPath))
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if err != nil {
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if os.IsNotExist(err) {
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return nil, 0, traceError(errFileNotFound)
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} else if os.IsPermission(err) {
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return nil, 0, traceError(errFileAccessDenied)
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} else if isSysErrNotDir(err) {
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// File path cannot be verified since one of the parents is a file.
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return nil, 0, traceError(errFileAccessDenied)
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} else if isSysErrPathNotFound(err) {
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// Add specific case for windows.
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return nil, 0, traceError(errFileNotFound)
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}
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return nil, 0, traceError(err)
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}
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// Stat to get the size of the file at path.
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st, err := osStat(preparePath(readPath))
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if err != nil {
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return nil, 0, traceError(err)
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}
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// Verify if its not a regular file, since subsequent Seek is undefined.
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if !st.Mode().IsRegular() {
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return nil, 0, traceError(errIsNotRegular)
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}
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// Seek to the requested offset.
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if offset > 0 {
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_, err = fr.Seek(offset, os.SEEK_SET)
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if err != nil {
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return nil, 0, traceError(err)
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}
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}
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// Success.
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return fr, st.Size(), nil
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}
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// Creates a file and copies data from incoming reader. Staging buffer is used by io.CopyBuffer.
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func fsCreateFile(filePath string, reader io.Reader, buf []byte, fallocSize int64) (int64, error) {
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if filePath == "" || reader == nil {
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return 0, traceError(errInvalidArgument)
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}
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if err := checkPathLength(filePath); err != nil {
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return 0, traceError(err)
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}
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if err := mkdirAll(pathutil.Dir(filePath), 0777); err != nil {
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return 0, traceError(err)
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}
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if err := checkDiskFree(pathutil.Dir(filePath), fallocSize); err != nil {
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return 0, traceError(err)
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}
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writer, err := os.OpenFile(preparePath(filePath), os.O_CREATE|os.O_WRONLY, 0666)
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if err != nil {
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// File path cannot be verified since one of the parents is a file.
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if isSysErrNotDir(err) {
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return 0, traceError(errFileAccessDenied)
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}
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return 0, err
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}
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defer writer.Close()
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// Fallocate only if the size is final object is known.
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if fallocSize > 0 {
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if err = fsFAllocate(int(writer.Fd()), 0, fallocSize); err != nil {
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return 0, traceError(err)
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}
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}
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var bytesWritten int64
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if buf != nil {
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bytesWritten, err = io.CopyBuffer(writer, reader, buf)
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if err != nil {
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return 0, traceError(err)
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}
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} else {
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bytesWritten, err = io.Copy(writer, reader)
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if err != nil {
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return 0, traceError(err)
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}
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}
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return bytesWritten, nil
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}
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// Removes uploadID at destination path.
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func fsRemoveUploadIDPath(basePath, uploadIDPath string) error {
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if basePath == "" || uploadIDPath == "" {
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return traceError(errInvalidArgument)
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}
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if err := checkPathLength(basePath); err != nil {
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return traceError(err)
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}
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if err := checkPathLength(uploadIDPath); err != nil {
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return traceError(err)
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}
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// List all the entries in uploadID.
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entries, err := readDir(uploadIDPath)
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if err != nil && err != errFileNotFound {
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return traceError(err)
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}
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// Delete all the entries obtained from previous readdir.
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for _, entryPath := range entries {
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err = fsDeleteFile(basePath, pathJoin(uploadIDPath, entryPath))
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if err != nil && err != errFileNotFound {
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return traceError(err)
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}
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}
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return nil
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}
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// fsFAllocate is similar to Fallocate but provides a convenient
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// wrapper to handle various operating system specific errors.
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func fsFAllocate(fd int, offset int64, len int64) (err error) {
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e := Fallocate(fd, offset, len)
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// Ignore errors when Fallocate is not supported in the current system
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if e != nil && !isSysErrNoSys(e) && !isSysErrOpNotSupported(e) {
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switch {
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case isSysErrNoSpace(e):
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err = errDiskFull
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case isSysErrIO(e):
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err = e
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default:
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// For errors: EBADF, EINTR, EINVAL, ENODEV, EPERM, ESPIPE and ETXTBSY
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// Appending was failed anyway, returns unexpected error
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err = errUnexpected
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}
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return err
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}
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return nil
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}
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// Renames source path to destination path, creates all the
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// missing parents if they don't exist.
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func fsRenameFile(sourcePath, destPath string) error {
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if err := checkPathLength(sourcePath); err != nil {
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return traceError(err)
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}
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if err := checkPathLength(destPath); err != nil {
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return traceError(err)
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}
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// Verify if source path exists.
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if _, err := os.Stat(preparePath(sourcePath)); err != nil {
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if os.IsNotExist(err) {
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return traceError(errFileNotFound)
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} else if os.IsPermission(err) {
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return traceError(errFileAccessDenied)
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} else if isSysErrPathNotFound(err) {
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return traceError(errFileNotFound)
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} else if isSysErrNotDir(err) {
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// File path cannot be verified since one of the parents is a file.
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return traceError(errFileAccessDenied)
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}
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return traceError(err)
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}
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if err := mkdirAll(pathutil.Dir(destPath), 0777); err != nil {
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return traceError(err)
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}
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if err := os.Rename(preparePath(sourcePath), preparePath(destPath)); err != nil {
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return traceError(err)
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}
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return nil
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}
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// Delete a file and its parent if it is empty at the destination path.
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// this function additionally protects the basePath from being deleted.
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func fsDeleteFile(basePath, deletePath string) error {
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if err := checkPathLength(basePath); err != nil {
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return traceError(err)
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}
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if err := checkPathLength(deletePath); err != nil {
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return traceError(err)
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}
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if basePath == deletePath {
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return nil
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}
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// Verify if the path exists.
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pathSt, err := osStat(preparePath(deletePath))
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if err != nil {
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if os.IsNotExist(err) {
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return traceError(errFileNotFound)
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} else if os.IsPermission(err) {
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return traceError(errFileAccessDenied)
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}
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return traceError(err)
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}
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if pathSt.IsDir() && !isDirEmpty(deletePath) {
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// Verify if directory is empty.
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return nil
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}
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// Attempt to remove path.
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if err = os.Remove(preparePath(deletePath)); err != nil {
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if os.IsNotExist(err) {
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return traceError(errFileNotFound)
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} else if os.IsPermission(err) {
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return traceError(errFileAccessDenied)
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} else if isSysErrNotEmpty(err) {
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return traceError(errVolumeNotEmpty)
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}
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return traceError(err)
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}
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// Recursively go down the next path and delete again.
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if err := fsDeleteFile(basePath, pathutil.Dir(deletePath)); 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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// fsRemoveMeta safely removes a locked file and takes care of Windows special case
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func fsRemoveMeta(basePath, deletePath, tmpDir string) error {
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// Special case for windows please read through.
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if runtime.GOOS == globalWindowsOSName {
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// Ordinarily windows does not permit deletion or renaming of files still
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// in use, but if all open handles to that file were opened with FILE_SHARE_DELETE
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// then it can permit renames and deletions of open files.
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//
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// There are however some gotchas with this, and it is worth listing them here.
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// Firstly, Windows never allows you to really delete an open file, rather it is
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// flagged as delete pending and its entry in its directory remains visible
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// (though no new file handles may be opened to it) and when the very last
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// open handle to the file in the system is closed, only then is it truly
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// deleted. Well, actually only sort of truly deleted, because Windows only
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// appears to remove the file entry from the directory, but in fact that
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// entry is merely hidden and actually still exists and attempting to create
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// a file with the same name will return an access denied error. How long it
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// silently exists for depends on a range of factors, but put it this way:
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// if your code loops creating and deleting the same file name as you might
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// when operating a lock file, you're going to see lots of random spurious
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// access denied errors and truly dismal lock file performance compared to POSIX.
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//
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// We work-around these un-POSIX file semantics by taking a dual step to
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// deleting files. Firstly, it renames the file to tmp location into multipartTmpBucket
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// We always open files with FILE_SHARE_DELETE permission enabled, with that
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// flag Windows permits renaming and deletion, and because the name was changed
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// to a very random name somewhere not in its origin directory before deletion,
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// you don't see those unexpected random errors when creating files with the
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// same name as a recently deleted file as you do anywhere else on Windows.
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// Because the file is probably not in its original containing directory any more,
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// deletions of that directory will not fail with "directory not empty" as they
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// otherwise normally would either.
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tmpPath := pathJoin(tmpDir, mustGetUUID())
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fsRenameFile(deletePath, tmpPath)
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// Proceed to deleting the directory if empty
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fsDeleteFile(basePath, pathutil.Dir(deletePath))
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// Finally delete the renamed file.
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return fsDeleteFile(tmpDir, tmpPath)
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}
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return fsDeleteFile(basePath, deletePath)
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}
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