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// Copyright 2020 PingCAP, 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package task
import (
"bytes"
"context"
"fmt"
"path/filepath"
"github.com/pingcap/errors"
"github.com/pingcap/tiup/pkg/cluster/ctxt"
)
// BackupComponent is used to copy all files related the specific version a component
// to the target directory of path
type BackupComponent struct {
component string
fromVer string
host string
deployDir string
}
// Execute implements the Task interface
func (c *BackupComponent) Execute(ctx context.Context) error {
// Copy to remote server
exec, found := ctxt.GetInner(ctx).GetExecutor(c.host)
if !found {
return ErrNoExecutor
}
binDir := filepath.Join(c.deployDir, "bin")
// Make upgrade idempotent
// The old version has been backup if upgrade abort
cmd := fmt.Sprintf(`test -d %[2]s || cp -r %[1]s %[2]s`, binDir, binDir+".old."+c.fromVer)
_, stderr, err := exec.Execute(ctx, cmd, false)
if err != nil {
// ignore error if the source path does not exist, this is possible when
// there are multiple instances share the same deploy_dir, typical case
// is imported cluster
// NOTE: by changing the behaviour to cp instead of mv in line 45, we don't
// need to check "no such file" anymore, but I'm keeping it here in case
// we got a better way handling the backups later
if !(bytes.Contains(stderr, []byte("No such file or directory")) ||
bytes.Contains(stderr, []byte("File exists"))) {
return errors.Annotate(err, cmd)
}
}
return nil
}
// Rollback implements the Task interface
func (c *BackupComponent) Rollback(ctx context.Context) error {
return nil
}
// String implements the fmt.Stringer interface
func (c *BackupComponent) String() string {
return fmt.Sprintf("BackupComponent: component=%s, currentVersion=%s, remote=%s:%s",
c.component, c.fromVer, c.host, c.deployDir)
}
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