mirror of
https://github.com/vmware-tanzu/velero.git
synced 2026-07-28 02:52:41 +00:00
Xun Jiang
49b670a791
Change errors.Cause to errors.Is, because github.com/cockroachdb/errors New() function create a error with error stack with depth 1, but github.com/pkg/errors's New() function create error with no depth. Signed-off-by: Xun Jiang <xun.jiang@broadcom.com>
125 lines
3.1 KiB
Go
125 lines
3.1 KiB
Go
//go:build !windows
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// +build !windows
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/*
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Copyright The Velero Contributors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 kopia
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import (
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"context"
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"io"
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"os"
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"path/filepath"
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"syscall"
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"github.com/cockroachdb/errors"
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"github.com/kopia/kopia/fs"
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"github.com/kopia/kopia/snapshot/restore"
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)
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type BlockOutput struct {
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*restore.FilesystemOutput
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targetFileName string
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targetFile *os.File
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}
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var _ restore.Output = &BlockOutput{}
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const bufferSize = 128 * 1024
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func (o *BlockOutput) WriteFile(ctx context.Context, relativePath string, remoteFile fs.File, progressCb restore.FileWriteProgress) error {
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remoteReader, err := remoteFile.Open(ctx)
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if err != nil {
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return errors.Wrapf(err, "failed to open remote file %s", remoteFile.Name())
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}
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defer remoteReader.Close()
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targetFile, err := os.Create(o.targetFileName)
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if err != nil {
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return errors.Wrapf(err, "failed to open file %s", o.targetFileName)
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}
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o.targetFile = targetFile
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buffer := make([]byte, bufferSize)
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readData := true
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for readData {
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bytesToWrite, err := remoteReader.Read(buffer)
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if err != nil {
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if err != io.EOF {
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return errors.Wrapf(err, "failed to read data from remote file %s", o.targetFileName)
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}
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readData = false
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}
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if bytesToWrite > 0 {
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offset := 0
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for bytesToWrite > 0 {
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if bytesWritten, err := targetFile.Write(buffer[offset:bytesToWrite]); err == nil {
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progressCb(int64(bytesWritten))
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bytesToWrite -= bytesWritten
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offset += bytesWritten
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} else {
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return errors.Wrapf(err, "failed to write data to file %s", o.targetFileName)
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}
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}
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}
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}
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return nil
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}
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func (o *BlockOutput) BeginDirectory(ctx context.Context, relativePath string, e fs.Directory) error {
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var err error
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o.targetFileName, err = filepath.EvalSymlinks(o.TargetPath)
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if err != nil {
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return errors.Wrapf(err, "unable to evaluate symlinks for %s", o.targetFileName)
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}
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fileInfo, err := os.Lstat(o.targetFileName)
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if err != nil {
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return errors.Wrapf(err, "unable to get the target device information for %s", o.TargetPath)
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}
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if (fileInfo.Sys().(*syscall.Stat_t).Mode & syscall.S_IFMT) != syscall.S_IFBLK {
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return errors.Errorf("target file %s is not a block device", o.TargetPath)
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}
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return nil
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}
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func (o *BlockOutput) Flush() error {
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if o.targetFile != nil {
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if err := o.targetFile.Sync(); err != nil {
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return errors.Wrapf(err, "error syncing block dev %v", o.targetFileName)
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}
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}
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return nil
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}
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func (o *BlockOutput) Terminate() error {
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if o.targetFile != nil {
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if err := o.targetFile.Close(); err != nil {
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return errors.Wrapf(err, "error closing block dev %v", o.targetFileName)
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}
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}
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return nil
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}
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