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admin-cluster-bucket-export.go
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admin-cluster-bucket-export.go
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// Copyright (c) 2022 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
"context"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"time"
"github.com/fatih/color"
"github.com/minio/cli"
json "github.com/minio/colorjson"
"github.com/minio/mc/pkg/probe"
"github.com/minio/pkg/console"
)
var adminClusterBucketExportCmd = cli.Command{
Name: "export",
Usage: "backup bucket metadata to a zip file",
Action: mainClusterBucketExport,
OnUsageError: onUsageError,
Before: setGlobalsFromContext,
Flags: globalFlags,
HideHelpCommand: true,
CustomHelpTemplate: `NAME:
{{.HelpName}} - {{.Usage}}
USAGE:
{{.HelpName}} [FLAGS] TARGET/[BUCKET]
FLAGS:
{{range .VisibleFlags}}{{.}}
{{end}}
EXAMPLES:
1. Save metadata of all buckets to a zip file.
{{.Prompt}} {{.HelpName}} myminio
`,
}
func checkBucketExportSyntax(ctx *cli.Context) {
if len(ctx.Args()) != 1 {
cli.ShowCommandHelpAndExit(ctx, "export", 1) // last argument is exit code
}
}
// mainClusterBucketExport - metadata export command
func mainClusterBucketExport(ctx *cli.Context) error {
// Check for command syntax
checkBucketExportSyntax(ctx)
// Get the alias parameter from cli
args := ctx.Args()
aliasedURL := args.Get(0)
console.SetColor("File", color.New(color.FgWhite, color.Bold))
// Create a new MinIO Admin Client
client, err := newAdminClient(aliasedURL)
if err != nil {
fatalIf(err.Trace(aliasedURL), "Unable to initialize admin client.")
return nil
}
// Compute bucket and object from the aliased URL
aliasedURL = filepath.ToSlash(aliasedURL)
aliasedURL = filepath.Clean(aliasedURL)
_, bucket := url2Alias(aliasedURL)
r, ierr := client.ExportBucketMetadata(context.Background(), bucket)
fatalIf(probe.NewError(ierr).Trace(aliasedURL), "Unable to export bucket metadata.")
if bucket == "" {
bucket = "cluster"
}
// Create bucket metadata zip file
tmpFile, e := ioutil.TempFile("", fmt.Sprintf("%s-metadata-", bucket))
fatalIf(probe.NewError(e), "Unable to download file data.")
ext := "zip"
// Copy zip content to target download file
_, e = io.Copy(tmpFile, r)
fatalIf(probe.NewError(e), "Unable to download bucket metadata.")
// Close everything
r.Close()
tmpFile.Close()
// We use 4 bytes of the 32 bytes to identify the file.
downloadPath := fmt.Sprintf("%s-metadata.%s", bucket, ext)
fi, e := os.Stat(downloadPath)
if e == nil && !fi.IsDir() {
e = moveFile(downloadPath, downloadPath+"."+time.Now().Format(dateTimeFormatFilename))
fatalIf(probe.NewError(e), "Unable to create a backup of "+downloadPath)
} else {
if !os.IsNotExist(e) {
fatal(probe.NewError(e), "Unable to download file data")
}
}
fatalIf(probe.NewError(moveFile(tmpFile.Name(), downloadPath)), "Unable to rename downloaded data, file exists at %s", tmpFile.Name())
if !globalJSON {
console.Infof("Bucket metadata successfully downloaded as %s\n", downloadPath)
return nil
}
v := struct {
File string `json:"file"`
Key string `json:"key,omitempty"`
}{
File: downloadPath,
}
b, e := json.Marshal(v)
fatalIf(probe.NewError(e), "Unable to serialize data")
console.Println(string(b))
return nil
}