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remote.go
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/
remote.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 cas implements a content-addressable-store on disk.
// It leverages the `diskv` package to store items in a simple
// key-value blob store: https://github.com/peterbourgon/diskv
package cas
import (
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"time"
"github.com/coreos/rocket/pkg/keystore"
"github.com/coreos/rocket/Godeps/_workspace/src/github.com/appc/spec/aci"
"github.com/coreos/rocket/Godeps/_workspace/src/github.com/appc/spec/schema/types"
"github.com/coreos/rocket/Godeps/_workspace/src/github.com/mitchellh/ioprogress"
"github.com/coreos/rocket/Godeps/_workspace/src/golang.org/x/crypto/openpgp"
)
func NewRemote(aciurl, sigurl string) *Remote {
r := &Remote{
ACIURL: aciurl,
SigURL: sigurl,
}
return r
}
type Remote struct {
ACIURL string
SigURL string
ETag string
// The key in the blob store under which the ACI has been saved.
BlobKey string
}
func (r Remote) Marshal() []byte {
m, _ := json.Marshal(r)
return m
}
func (r *Remote) Unmarshal(data []byte) {
err := json.Unmarshal(data, r)
if err != nil {
panic(err)
}
}
func (r Remote) Hash() string {
return types.NewHashSHA512([]byte(r.ACIURL)).String()
}
func (r Remote) Type() int64 {
return remoteType
}
// Download downloads and verifies the remote ACI.
// If Keystore is nil signature verification will be skipped.
// Download returns the signer, an *os.File representing the ACI, and an error if any.
// err will be nil if the ACI downloads successfully and the ACI is verified.
func (r Remote) Download(ds Store, ks *keystore.Keystore) (*openpgp.Entity, *os.File, error) {
var entity *openpgp.Entity
var err error
acif, err := downloadACI(ds, r.ACIURL)
if err != nil {
return nil, acif, fmt.Errorf("error downloading the aci image: %v", err)
}
if ks != nil {
fmt.Printf("Downloading signature from %v\n", r.SigURL)
sigTempFile, err := downloadSignatureFile(r.SigURL)
if err != nil {
return nil, acif, fmt.Errorf("error downloading the signature file: %v", err)
}
defer sigTempFile.Close()
defer os.Remove(sigTempFile.Name())
manifest, err := aci.ManifestFromImage(acif)
if err != nil {
return nil, acif, err
}
if _, err := acif.Seek(0, 0); err != nil {
return nil, acif, err
}
if _, err := sigTempFile.Seek(0, 0); err != nil {
return nil, acif, err
}
if entity, err = ks.CheckSignature(manifest.Name.String(), acif, sigTempFile); err != nil {
return nil, acif, err
}
}
if _, err := acif.Seek(0, 0); err != nil {
return nil, acif, err
}
return entity, acif, nil
}
// TODO: add locking
// Store stores the ACI represented by r in the target data store.
func (r Remote) Store(ds Store, aci io.Reader) (*Remote, error) {
key, err := ds.WriteACI(aci)
if err != nil {
return nil, err
}
r.BlobKey = key
ds.WriteIndex(&r)
return &r, nil
}
func downloadACI(ds Store, aciurl string) (*os.File, error) {
res, err := http.Get(aciurl)
if err != nil {
return nil, err
}
defer res.Body.Close()
prefix := "Downloading aci"
fmtBytesSize := 18
barSize := int64(80 - len(prefix) - fmtBytesSize)
bar := ioprogress.DrawTextFormatBar(barSize)
fmtfunc := func(progress, total int64) string {
return fmt.Sprintf(
"%s: %s %s",
prefix,
bar(progress, total),
ioprogress.DrawTextFormatBytes(progress, total),
)
}
reader := &ioprogress.Reader{
Reader: res.Body,
Size: res.ContentLength,
DrawFunc: ioprogress.DrawTerminalf(os.Stdout, fmtfunc),
DrawInterval: time.Second,
}
// TODO(jonboulle): handle http more robustly (redirects?)
if res.StatusCode != http.StatusOK {
return nil, fmt.Errorf("bad HTTP status code: %d", res.StatusCode)
}
aciTempFile, err := ds.tmpFile()
if err != nil {
return nil, fmt.Errorf("error downloading aci: %v", err)
}
if _, err := io.Copy(aciTempFile, reader); err != nil {
aciTempFile.Close()
os.Remove(aciTempFile.Name())
return nil, fmt.Errorf("error copying temp aci: %v", err)
}
if err := aciTempFile.Sync(); err != nil {
aciTempFile.Close()
os.Remove(aciTempFile.Name())
return nil, fmt.Errorf("error writing temp aci: %v", err)
}
return aciTempFile, nil
}
func downloadSignatureFile(sigurl string) (*os.File, error) {
sig, err := ioutil.TempFile("", "")
if err != nil {
return nil, fmt.Errorf("error downloading signature: %v", err)
}
res, err := http.Get(sigurl)
if err != nil {
return nil, fmt.Errorf("error downloading signature: %v", err)
}
defer res.Body.Close()
// TODO(jonboulle): handle http more robustly (redirects?)
if res.StatusCode != http.StatusOK {
return nil, fmt.Errorf("bad HTTP status code: %d", res.StatusCode)
}
if _, err := io.Copy(sig, res.Body); err != nil {
sig.Close()
os.Remove(sig.Name())
return nil, fmt.Errorf("error copying signature: %v", err)
}
if err := sig.Sync(); err != nil {
sig.Close()
os.Remove(sig.Name())
return nil, fmt.Errorf("error writing signature: %v", err)
}
return sig, nil
}