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aci.go
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aci.go
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// Copyright 2014 CoreOS, 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 aci implements helper functions for working with ACIs
package aci
import (
"archive/tar"
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"strings"
"github.com/coreos/rocket/Godeps/_workspace/src/github.com/appc/spec/aci"
"github.com/coreos/rocket/Godeps/_workspace/src/github.com/appc/spec/schema"
"github.com/coreos/rocket/Godeps/_workspace/src/golang.org/x/crypto/openpgp"
)
type ACIEntry struct {
Header *tar.Header
Contents string
}
// NewBasicACI creates a new ACI in the given directory with the given name.
// Used for testing.
func NewBasicACI(dir string, name string) (*os.File, error) {
manifest := fmt.Sprintf(`{"acKind":"ImageManifest","acVersion":"0.1.1","name":"%s"}`, name)
return NewACI(dir, manifest, nil)
}
// NewACI creates a new ACI in the given directory with the given image
// manifest and entries.
// Used for testing.
func NewACI(dir string, manifest string, entries []*ACIEntry) (*os.File, error) {
var im schema.ImageManifest
if err := im.UnmarshalJSON([]byte(manifest)); err != nil {
return nil, err
}
tf, err := ioutil.TempFile(dir, "")
if err != nil {
return nil, err
}
defer os.Remove(tf.Name())
tw := tar.NewWriter(tf)
aw := aci.NewImageWriter(im, tw)
for _, entry := range entries {
// Add default mode
if entry.Header.Mode == 0 {
if entry.Header.Typeflag == tar.TypeDir {
entry.Header.Mode = 0755
} else {
entry.Header.Mode = 0644
}
}
sr := strings.NewReader(entry.Contents)
if err := aw.AddFile(entry.Header, sr); err != nil {
return nil, err
}
}
if err := aw.Close(); err != nil {
return nil, err
}
return tf, nil
}
// NewDetachedSignature creates a new openpgp armored detached signature for the given ACI
// signed with armoredPrivateKey.
func NewDetachedSignature(armoredPrivateKey string, aci io.Reader) (io.Reader, error) {
entityList, err := openpgp.ReadArmoredKeyRing(bytes.NewBufferString(armoredPrivateKey))
if err != nil {
return nil, err
}
if len(entityList) < 1 {
return nil, errors.New("empty entity list")
}
signature := &bytes.Buffer{}
if err := openpgp.ArmoredDetachSign(signature, entityList[0], aci, nil); err != nil {
return nil, err
}
return signature, nil
}