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/
uuid.go
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/
uuid.go
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// Copyright 2015 The rkt Authors
//
// 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 pod
import (
"bytes"
"errors"
"fmt"
"io/ioutil"
"strings"
"github.com/appc/spec/schema/types"
"github.com/hashicorp/errwrap"
)
// matchUUID attempts to match the uuid specified as uuid against all pods present.
// An array of matches is returned, which may be empty when nothing matches.
func matchUUID(dataDir, uuid string) ([]string, error) {
if uuid == "" {
return nil, types.ErrNoEmptyUUID
}
ls, err := listPods(dataDir, IncludeMostDirs)
if err != nil {
return nil, err
}
var matches []string
for _, p := range ls {
if strings.HasPrefix(p, uuid) {
matches = append(matches, p)
}
}
return matches, nil
}
// resolveUUID attempts to resolve the uuid specified as uuid against all pods present.
// An unambiguously matched uuid or nil is returned.
func resolveUUID(dataDir, uuid string) (*types.UUID, error) {
uuid = strings.ToLower(uuid)
m, err := matchUUID(dataDir, uuid)
if err != nil {
return nil, err
}
if len(m) == 0 {
return nil, fmt.Errorf("no matches found for %q", uuid)
}
if len(m) > 1 {
return nil, fmt.Errorf("ambiguous uuid, %d matches", len(m))
}
u, err := types.NewUUID(m[0])
if err != nil {
return nil, errwrap.Wrap(errors.New("invalid UUID"), err)
}
return u, nil
}
// ReadUUIDFromFile reads the uuid string from the given path.
func ReadUUIDFromFile(path string) (string, error) {
uuid, err := ioutil.ReadFile(path)
if err != nil {
return "", err
}
return string(bytes.TrimSpace(uuid)), nil
}
// WriteUUIDToFile writes the uuid string to the given path.
func WriteUUIDToFile(uuid *types.UUID, path string) error {
return ioutil.WriteFile(path, []byte(uuid.String()), 0644)
}