mirror of https://github.com/octoleo/restic.git
103 lines
2.6 KiB
Go
103 lines
2.6 KiB
Go
/*
|
|
* Minio Go Library for Amazon S3 Compatible Cloud Storage (C) 2015 Minio, Inc.
|
|
*
|
|
* 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 minio
|
|
|
|
import (
|
|
"io"
|
|
"os"
|
|
"path/filepath"
|
|
)
|
|
|
|
// FGetObject - get object to a file.
|
|
func (c Client) FGetObject(bucketName, objectName, filePath string) error {
|
|
// Input validation.
|
|
if err := isValidBucketName(bucketName); err != nil {
|
|
return err
|
|
}
|
|
if err := isValidObjectName(objectName); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Verify if destination already exists.
|
|
st, err := os.Stat(filePath)
|
|
if err == nil {
|
|
// If the destination exists and is a directory.
|
|
if st.IsDir() {
|
|
return ErrInvalidArgument("fileName is a directory.")
|
|
}
|
|
}
|
|
|
|
// Proceed if file does not exist. return for all other errors.
|
|
if err != nil {
|
|
if !os.IsNotExist(err) {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Extract top level direcotry.
|
|
objectDir, _ := filepath.Split(filePath)
|
|
if objectDir != "" {
|
|
// Create any missing top level directories.
|
|
if err := os.MkdirAll(objectDir, 0700); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Gather md5sum.
|
|
objectStat, err := c.StatObject(bucketName, objectName)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Write to a temporary file "fileName.part.minio" before saving.
|
|
filePartPath := filePath + objectStat.ETag + ".part.minio"
|
|
|
|
// If exists, open in append mode. If not create it as a part file.
|
|
filePart, err := os.OpenFile(filePartPath, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0600)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Issue Stat to get the current offset.
|
|
st, err = filePart.Stat()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Seek to current position for incoming reader.
|
|
objectReader, objectStat, err := c.getObject(bucketName, objectName, st.Size(), 0)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Write to the part file.
|
|
if _, err = io.CopyN(filePart, objectReader, objectStat.Size); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Close the file before rename, this is specifically needed for Windows users.
|
|
filePart.Close()
|
|
|
|
// Safely completed. Now commit by renaming to actual filename.
|
|
if err = os.Rename(filePartPath, filePath); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Return.
|
|
return nil
|
|
}
|