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kube-arangodb/cmd/uuid.go

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//
// DISCLAIMER
//
2022-01-10 11:35:49 +00:00
// Copyright 2016-2022 ArangoDB GmbH, Cologne, Germany
//
// 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.
//
// Copyright holder is ArangoDB GmbH, Cologne, Germany
//
package cmd
import (
"fmt"
"io/ioutil"
"os"
"strings"
"github.com/pkg/errors"
"github.com/rs/zerolog/log"
"github.com/spf13/cobra"
)
type cmdUUIDInputStruct struct {
uuidPath, uuid, engine, enginePath string
require bool
}
var (
cmdUUID = &cobra.Command{
Use: "uuid",
RunE: cmdUUIDSave,
Hidden: true,
}
cmdUUIDInput cmdUUIDInputStruct
)
func init() {
cmdMain.AddCommand(cmdUUID)
f := cmdUUID.Flags()
f.StringVar(&cmdUUIDInput.uuidPath, "uuid-path", "", "Path to the UUID file")
f.StringVar(&cmdUUIDInput.engine, "engine", "", "Path to the ENGINE file")
f.StringVar(&cmdUUIDInput.uuid, "uuid", "", "UUID of server")
f.StringVar(&cmdUUIDInput.enginePath, "engine-path", "", "ENGINE of server")
f.BoolVar(&cmdUUIDInput.require, "require", false, "Ensure that UUID and ENGINE file is in place")
}
func cmdUUIDSave(cmd *cobra.Command, args []string) error {
if cmdUUIDInput.uuidPath == "" {
return errors.Errorf("Path cannot be empty")
}
if cmdUUIDInput.require {
if cmdUUIDInput.enginePath == "" {
return errors.Errorf("Path to the ENGINE cannot be empty")
}
if cmdUUIDInput.engine == "" {
return errors.Errorf("ENGINE cannot be empty")
}
}
if cmdUUIDInput.uuid == "" {
return errors.Errorf("UUID cannot be empty")
}
log.Info().Msg("Saving UUID in file")
if exists, err := fileExists(cmdUUIDInput.uuidPath); err != nil {
log.Error().Err(err).Msg("Unable to get file info")
return err
} else if !exists {
if cmdUUIDInput.require {
log.Warn().Msg("Init phase is not defined, but file does not exists")
if exists, err := fileExists(cmdUUIDInput.uuidPath); err != nil {
log.Error().Err(err).Msg("Unable to get ENGINE info")
return err
} else if !exists {
log.Info().Msg("ENGINE file does not exist - able to proceed")
} else {
log.Error().Msg("ENGINE file found but UUID is missing - will not proceed")
return errors.Errorf("ENGINE file found but UUID is missing - will not proceed")
}
}
fileContent := fmt.Sprintf("%s\n", cmdUUIDInput.uuid)
if err := ioutil.WriteFile(cmdUUIDInput.uuidPath, []byte(fileContent), 0644); err != nil {
log.Error().Err(err).Msg("Unable to save UUID")
return err
}
log.Info().Msg("UUID saved")
return nil
}
if equal, content, err := checkFileContent(cmdUUIDInput.uuidPath, cmdUUIDInput.uuid); err != nil {
log.Error().Err(err).Msg("Unable to get UUID info")
return err
} else if !equal {
log.Error().Str("expected", cmdUUIDInput.uuid).Str("actual", content).Msg("UUID does not match expected")
return errors.Errorf("UUID mismatch")
} else {
log.Info().Msg("UUID is valid")
}
if cmdUUIDInput.require {
if exists, err := fileExists(cmdUUIDInput.enginePath); err != nil {
log.Error().Err(err).Msg("Unable to get ENGINE info")
return err
} else if exists {
if equal, content, err := checkFileContent(cmdUUIDInput.enginePath, cmdUUIDInput.engine); err != nil {
log.Error().Err(err).Msg("Unable to get ENGINE info")
return err
} else if !equal {
log.Error().Str("expected", cmdUUIDInput.engine).Str("actual", content).Msg("ENGINE does not match expected")
return errors.Errorf("ENGINE mismatch")
} else {
log.Info().Msg("ENGINE is valid")
}
} else {
log.Info().Msg("ENGINE file is missing, but UUID is in place - we can proceed")
}
}
log.Info().Msg("Init Phase is valid")
return nil
}
func fileExists(path string) (bool, error) {
if _, err := os.Stat(path); err != nil {
if os.IsNotExist(err) {
return false, nil
}
return false, err
}
return true, nil
}
func checkFileContent(path, expected string) (bool, string, error) {
content, err := ioutil.ReadFile(path)
if err != nil {
return false, "", err
}
contentString := strings.TrimSuffix(string(content), "\n")
return contentString == expected, contentString, nil
}