mirror of https://github.com/minio/minio.git
481 lines
13 KiB
Go
481 lines
13 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package cmd
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import (
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"context"
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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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"strings"
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"time"
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"github.com/minio/minio/internal/lock"
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"github.com/minio/minio/internal/logger"
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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(ctx context.Context, filePath string) (err error) {
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if filePath == "" {
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logger.LogIf(ctx, errInvalidArgument)
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return errInvalidArgument
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}
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if err = checkPathLength(filePath); err != nil {
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logger.LogIf(ctx, err)
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return err
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}
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if err = os.Remove(filePath); err != nil {
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if err = osErrToFileErr(err); err != errFileNotFound {
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logger.LogIf(ctx, err)
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}
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}
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return err
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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(ctx context.Context, dirPath string) (err error) {
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if dirPath == "" {
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logger.LogIf(ctx, errInvalidArgument)
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return errInvalidArgument
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}
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if err = checkPathLength(dirPath); err != nil {
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logger.LogIf(ctx, err)
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return err
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}
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if err = removeAll(dirPath); err != nil {
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if osIsPermission(err) {
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logger.LogIf(ctx, errVolumeAccessDenied)
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return errVolumeAccessDenied
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} else if isSysErrNotEmpty(err) {
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logger.LogIf(ctx, errVolumeNotEmpty)
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return errVolumeNotEmpty
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}
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logger.LogIf(ctx, err)
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return 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(ctx context.Context, dirPath string) (err error) {
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if dirPath == "" {
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logger.LogIf(ctx, errInvalidArgument)
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return errInvalidArgument
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}
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if err = checkPathLength(dirPath); err != nil {
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logger.LogIf(ctx, err)
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return err
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}
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if err = os.Remove((dirPath)); err != nil {
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if osIsNotExist(err) {
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return errVolumeNotFound
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} else if isSysErrNotEmpty(err) {
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return errVolumeNotEmpty
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}
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logger.LogIf(ctx, err)
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return 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(ctx context.Context, dirPath string) (err error) {
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if dirPath == "" {
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logger.LogIf(ctx, errInvalidArgument)
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return errInvalidArgument
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}
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if err = checkPathLength(dirPath); err != nil {
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logger.LogIf(ctx, err)
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return err
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}
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if err = os.Mkdir((dirPath), 0777); err != nil {
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switch {
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case osIsExist(err):
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return errVolumeExists
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case osIsPermission(err):
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logger.LogIf(ctx, errDiskAccessDenied)
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return errDiskAccessDenied
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case 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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logger.LogIf(ctx, errDiskAccessDenied)
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return errDiskAccessDenied
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case isSysErrPathNotFound(err):
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// Add specific case for windows.
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logger.LogIf(ctx, errDiskAccessDenied)
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return errDiskAccessDenied
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default:
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logger.LogIf(ctx, err)
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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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// fsStat is a low level call which validates input arguments
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// and checks input length upto supported maximum. Does
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// not perform any higher layer interpretation of files v/s
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// directories. For higher level interpretation look at
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// fsStatFileDir, fsStatFile, fsStatDir.
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func fsStat(ctx context.Context, statLoc string) (os.FileInfo, error) {
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if statLoc == "" {
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logger.LogIf(ctx, errInvalidArgument)
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return nil, errInvalidArgument
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}
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if err := checkPathLength(statLoc); err != nil {
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logger.LogIf(ctx, err)
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return nil, err
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}
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fi, err := os.Stat(statLoc)
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if err != nil {
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return nil, err
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}
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return fi, nil
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}
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// fsTouch updates a file access & modtime with current time
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func fsTouch(ctx context.Context, statLoc string) error {
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if statLoc == "" {
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logger.LogIf(ctx, errInvalidArgument)
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return errInvalidArgument
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}
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if err := checkPathLength(statLoc); err != nil {
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logger.LogIf(ctx, err)
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return err
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}
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now := time.Now()
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if err := os.Chtimes(statLoc, now, now); err != nil {
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logger.LogIf(ctx, err)
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return err
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}
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return nil
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}
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// Lookup if volume exists, returns volume attributes upon success.
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func fsStatVolume(ctx context.Context, volume string) (os.FileInfo, error) {
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fi, err := fsStat(ctx, volume)
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if err != nil {
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if osIsNotExist(err) {
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return nil, errVolumeNotFound
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} else if osIsPermission(err) {
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return nil, errVolumeAccessDenied
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}
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return nil, err
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}
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if !fi.IsDir() {
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return nil, errVolumeAccessDenied
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}
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return fi, nil
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}
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// Lookup if directory exists, returns directory attributes upon success.
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func fsStatDir(ctx context.Context, statDir string) (os.FileInfo, error) {
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fi, err := fsStat(ctx, statDir)
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if err != nil {
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err = osErrToFileErr(err)
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if err != errFileNotFound {
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logger.LogIf(ctx, err)
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}
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return nil, err
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}
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if !fi.IsDir() {
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return nil, errFileNotFound
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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(ctx context.Context, statFile string) (os.FileInfo, error) {
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fi, err := fsStat(ctx, statFile)
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if err != nil {
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err = osErrToFileErr(err)
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if err != errFileNotFound {
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logger.LogIf(ctx, err)
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}
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return nil, err
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}
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if fi.IsDir() {
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return nil, errFileNotFound
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}
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return fi, nil
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}
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// Returns if the filePath is a regular file.
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func fsIsFile(ctx context.Context, filePath string) bool {
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fi, err := fsStat(ctx, filePath)
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if err != nil {
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return false
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}
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return fi.Mode().IsRegular()
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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(ctx context.Context, readPath string, offset int64) (io.ReadCloser, int64, error) {
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if readPath == "" || offset < 0 {
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logger.LogIf(ctx, errInvalidArgument)
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return nil, 0, errInvalidArgument
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}
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if err := checkPathLength(readPath); err != nil {
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logger.LogIf(ctx, err)
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return nil, 0, err
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}
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fr, err := os.Open(readPath)
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if err != nil {
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return nil, 0, osErrToFileErr(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 := fr.Stat()
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if err != nil {
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fr.Close()
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err = osErrToFileErr(err)
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if err != errFileNotFound {
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logger.LogIf(ctx, err)
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}
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return nil, 0, 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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fr.Close()
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return nil, 0, 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, io.SeekStart)
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if err != nil {
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fr.Close()
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logger.LogIf(ctx, err)
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return nil, 0, 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.
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func fsCreateFile(ctx context.Context, filePath string, reader io.Reader, fallocSize int64) (int64, error) {
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if filePath == "" || reader == nil {
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logger.LogIf(ctx, errInvalidArgument)
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return 0, errInvalidArgument
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}
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if err := checkPathLength(filePath); err != nil {
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logger.LogIf(ctx, err)
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return 0, err
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}
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if err := mkdirAll(pathutil.Dir(filePath), 0777); err != nil {
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switch {
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case osIsPermission(err):
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return 0, errFileAccessDenied
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case osIsExist(err):
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return 0, errFileAccessDenied
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case isSysErrIO(err):
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return 0, errFaultyDisk
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case isSysErrInvalidArg(err):
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return 0, errUnsupportedDisk
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case isSysErrNoSpace(err):
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return 0, errDiskFull
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}
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return 0, err
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}
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flags := os.O_CREATE | os.O_WRONLY
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if globalFSOSync {
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flags = flags | os.O_SYNC
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}
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writer, err := lock.Open(filePath, flags, 0666)
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if err != nil {
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return 0, osErrToFileErr(err)
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}
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defer writer.Close()
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bytesWritten, err := io.Copy(writer, reader)
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if err != nil {
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logger.LogIf(ctx, err)
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return 0, err
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}
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return bytesWritten, 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(ctx context.Context, sourcePath, destPath string) error {
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if err := checkPathLength(sourcePath); err != nil {
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logger.LogIf(ctx, err)
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return err
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}
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if err := checkPathLength(destPath); err != nil {
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logger.LogIf(ctx, err)
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return err
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}
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if err := renameAll(sourcePath, destPath); err != nil {
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logger.LogIf(ctx, err)
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return err
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}
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return nil
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}
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func deleteFile(basePath, deletePath string, recursive bool) error {
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if basePath == "" || deletePath == "" {
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return nil
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}
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isObjectDir := HasSuffix(deletePath, SlashSeparator)
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basePath = pathutil.Clean(basePath)
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deletePath = pathutil.Clean(deletePath)
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if !strings.HasPrefix(deletePath, basePath) || deletePath == basePath {
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return nil
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}
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var err error
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if recursive {
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os.RemoveAll(deletePath)
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} else {
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err = os.Remove(deletePath)
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}
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if err != nil {
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switch {
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case isSysErrNotEmpty(err):
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// if object is a directory, but if its not empty
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// return FileNotFound to indicate its an empty prefix.
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if isObjectDir {
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return errFileNotFound
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}
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// Ignore errors if the directory is not empty. The server relies on
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// this functionality, and sometimes uses recursion that should not
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// error on parent directories.
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return nil
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case osIsNotExist(err):
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return errFileNotFound
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case osIsPermission(err):
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return errFileAccessDenied
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case isSysErrIO(err):
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return errFaultyDisk
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default:
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return err
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}
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}
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deletePath = pathutil.Dir(deletePath)
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// Delete parent directory obviously not recursively. Errors for
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// parent directories shouldn't trickle down.
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deleteFile(basePath, deletePath, false)
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return nil
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}
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// fsDeleteFile is a wrapper for deleteFile(), after checking the path length.
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func fsDeleteFile(ctx context.Context, basePath, deletePath string) error {
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if err := checkPathLength(basePath); err != nil {
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logger.LogIf(ctx, err)
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return err
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}
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if err := checkPathLength(deletePath); err != nil {
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logger.LogIf(ctx, err)
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return err
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}
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if err := deleteFile(basePath, deletePath, false); err != nil {
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if err != errFileNotFound {
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logger.LogIf(ctx, err)
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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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// fsRemoveMeta safely removes a locked file and takes care of Windows special case
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func fsRemoveMeta(ctx context.Context, 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(ctx, deletePath, tmpPath)
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// Proceed to deleting the directory if empty
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fsDeleteFile(ctx, basePath, pathutil.Dir(deletePath))
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// Finally delete the renamed file.
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return fsDeleteFile(ctx, tmpDir, tmpPath)
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}
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return fsDeleteFile(ctx, basePath, deletePath)
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}
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