minio/bucket-policy-migrate.go

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/*
* Minio Cloud Storage, (C) 2016 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 main
import (
"bytes"
"io/ioutil"
"os"
"path/filepath"
"strings"
)
const policyJSON = "policy.json"
func getBucketFromPolicyPath(oldPolicyPath string) string {
bucketPrefix, _ := filepath.Split(oldPolicyPath)
_, bucketName := filepath.Split(strings.TrimSuffix(bucketPrefix, slashSeparator))
return bucketName
}
func cleanupOldBucketPolicyConfigs() error {
// Get old bucket policy config directory.
oldBucketsConfigDir, err := getOldBucketsConfigPath()
fatalIf(err, "Unable to fetch buckets config path to migrate bucket policy")
// Recursively remove configDir/buckets/ - old bucket policy config location.
// N B This is called only if all bucket policies were successfully migrated.
return os.RemoveAll(oldBucketsConfigDir)
}
func migrateBucketPolicyConfig(objAPI ObjectLayer) error {
// Get old bucket policy config directory.
oldBucketsConfigDir, err := getOldBucketsConfigPath()
fatalIf(err, "Unable to fetch buckets config path to migrate bucket policy")
// Check if config directory holding bucket policy exists before
// migration.
_, err = os.Stat(oldBucketsConfigDir)
if os.IsNotExist(err) {
return nil
}
if err != nil {
return err
}
// WalkFunc that migrates access-policy.json to
// .minio.sys/buckets/bucketName/policy.json on all disks.
migrateBucketPolicy := func(policyPath string, fileInfo os.FileInfo, err error) error {
// policyFile - e.g /configDir/sample-bucket/access-policy.json
if err != nil {
return err
}
// Skip entries that aren't bucket policy files.
if fileInfo.Name() != "access-policy.json" {
return nil
}
// Get bucketName from old policy file path.
bucketName := getBucketFromPolicyPath(policyPath)
// Read bucket policy config from old location.
policyBytes, err := ioutil.ReadFile(policyPath)
fatalIf(err, "Unable to read bucket policy to migrate bucket policy", policyPath)
newPolicyPath := retainSlash(bucketConfigPrefix) + retainSlash(bucketName) + policyJSON
// Erasure code the policy config to all the disks.
_, err = objAPI.PutObject(minioMetaBucket, newPolicyPath, int64(len(policyBytes)), bytes.NewReader(policyBytes), nil)
fatalIf(err, "Unable to write bucket policy during migration.", newPolicyPath)
return nil
}
return filepath.Walk(oldBucketsConfigDir, migrateBucketPolicy)
}