// ImageDownload checks if we have that Image Fingerprint else
// downloads the image from a remote server.
func (d *Daemon) ImageDownload(op *operation, server string, protocol string, certificate string, secret string, alias string, forContainer bool, autoUpdate bool) (string, error) {
var err error
var ss *shared.SimpleStreams
if protocol == "" {
protocol = "lxd"
}
fp := alias
// Expand aliases
if protocol == "simplestreams" {
ss, err = shared.SimpleStreamsClient(server, d.proxy)
if err != nil {
return "", err
}
target := ss.GetAlias(fp)
if target != "" {
fp = target
}
image, err := ss.GetImageInfo(fp)
if err != nil {
return "", err
}
if fp == alias {
alias = image.Fingerprint
}
fp = image.Fingerprint
} else if protocol == "lxd" {
target, err := remoteGetImageFingerprint(d, server, certificate, fp)
if err == nil && target != "" {
fp = target
}
}
if _, _, err := dbImageGet(d.db, fp, false, false); err == nil {
shared.Log.Debug("Image already exists in the db", log.Ctx{"image": fp})
// already have it
return fp, nil
}
shared.Log.Info(
"Image not in the db, downloading it",
log.Ctx{"image": fp, "server": server})
// Now check if we already downloading the image
d.imagesDownloadingLock.RLock()
if waitChannel, ok := d.imagesDownloading[fp]; ok {
// We already download the image
d.imagesDownloadingLock.RUnlock()
shared.Log.Info(
"Already downloading the image, waiting for it to succeed",
log.Ctx{"image": fp})
// Wait until the download finishes (channel closes)
if _, ok := <-waitChannel; ok {
shared.Log.Warn("Value transmitted over image lock semaphore?")
}
if _, _, err := dbImageGet(d.db, fp, false, true); err != nil {
shared.Log.Error(
"Previous download didn't succeed",
log.Ctx{"image": fp})
return "", fmt.Errorf("Previous download didn't succeed")
}
shared.Log.Info(
"Previous download succeeded",
log.Ctx{"image": fp})
return fp, nil
}
d.imagesDownloadingLock.RUnlock()
shared.Log.Info(
"Downloading the image",
log.Ctx{"image": fp})
// Add the download to the queue
d.imagesDownloadingLock.Lock()
d.imagesDownloading[fp] = make(chan bool)
d.imagesDownloadingLock.Unlock()
// Unlock once this func ends.
defer func() {
d.imagesDownloadingLock.Lock()
if waitChannel, ok := d.imagesDownloading[fp]; ok {
close(waitChannel)
delete(d.imagesDownloading, fp)
}
d.imagesDownloadingLock.Unlock()
}()
exporturl := server
var info shared.ImageInfo
info.Fingerprint = fp
destDir := shared.VarPath("images")
destName := filepath.Join(destDir, fp)
if shared.PathExists(destName) {
d.Storage.ImageDelete(fp)
}
progress := func(progressInt int) {
if op == nil {
return
}
meta := op.metadata
if meta == nil {
meta = make(map[string]interface{})
}
progress := fmt.Sprintf("%d%%", progressInt)
if meta["download_progress"] != progress {
meta["download_progress"] = progress
op.UpdateMetadata(meta)
}
}
if protocol == "lxd" {
/* grab the metadata from /1.0/images/%s */
var url string
if secret != "" {
url = fmt.Sprintf(
"%s/%s/images/%s?secret=%s",
server, shared.APIVersion, fp, secret)
} else {
url = fmt.Sprintf("%s/%s/images/%s", server, shared.APIVersion, fp)
}
resp, err := d.httpGetSync(url, certificate)
if err != nil {
shared.Log.Error(
"Failed to download image metadata",
log.Ctx{"image": fp, "err": err})
return "", err
}
if err := json.Unmarshal(resp.Metadata, &info); err != nil {
return "", err
}
/* now grab the actual file from /1.0/images/%s/export */
if secret != "" {
exporturl = fmt.Sprintf(
"%s/%s/images/%s/export?secret=%s",
server, shared.APIVersion, fp, secret)
} else {
exporturl = fmt.Sprintf(
"%s/%s/images/%s/export",
server, shared.APIVersion, fp)
}
} else if protocol == "simplestreams" {
err := ss.Download(fp, "meta", destName, nil)
if err != nil {
return "", err
}
err = ss.Download(fp, "root", destName+".rootfs", progress)
if err != nil {
return "", err
}
info, err := ss.GetImageInfo(fp)
if err != nil {
return "", err
}
info.Public = false
info.AutoUpdate = autoUpdate
_, err = imageBuildFromInfo(d, *info)
if err != nil {
return "", err
}
if alias != fp {
id, _, err := dbImageGet(d.db, fp, false, true)
if err != nil {
return "", err
}
err = dbImageSourceInsert(d.db, id, server, protocol, "", alias)
if err != nil {
return "", err
}
}
if forContainer {
return fp, dbImageLastAccessInit(d.db, fp)
}
return fp, nil
}
raw, err := d.httpGetFile(exporturl, certificate)
if err != nil {
shared.Log.Error(
"Failed to download image",
log.Ctx{"image": fp, "err": err})
return "", err
}
info.Size = raw.ContentLength
ctype, ctypeParams, err := mime.ParseMediaType(raw.Header.Get("Content-Type"))
if err != nil {
ctype = "application/octet-stream"
}
body := &shared.TransferProgress{Reader: raw.Body, Length: raw.ContentLength, Handler: progress}
if ctype == "multipart/form-data" {
// Parse the POST data
mr := multipart.NewReader(body, ctypeParams["boundary"])
// Get the metadata tarball
part, err := mr.NextPart()
if err != nil {
shared.Log.Error(
"Invalid multipart image",
log.Ctx{"image": fp, "err": err})
return "", err
}
if part.FormName() != "metadata" {
shared.Log.Error(
"Invalid multipart image",
log.Ctx{"image": fp, "err": err})
return "", fmt.Errorf("Invalid multipart image")
}
destName = filepath.Join(destDir, info.Fingerprint)
f, err := os.Create(destName)
if err != nil {
shared.Log.Error(
"Failed to save image",
log.Ctx{"image": fp, "err": err})
return "", err
}
_, err = io.Copy(f, part)
f.Close()
if err != nil {
shared.Log.Error(
"Failed to save image",
log.Ctx{"image": fp, "err": err})
return "", err
}
// Get the rootfs tarball
part, err = mr.NextPart()
if err != nil {
shared.Log.Error(
"Invalid multipart image",
log.Ctx{"image": fp, "err": err})
return "", err
}
if part.FormName() != "rootfs" {
shared.Log.Error(
"Invalid multipart image",
log.Ctx{"image": fp})
return "", fmt.Errorf("Invalid multipart image")
}
destName = filepath.Join(destDir, info.Fingerprint+".rootfs")
f, err = os.Create(destName)
if err != nil {
shared.Log.Error(
"Failed to save image",
log.Ctx{"image": fp, "err": err})
return "", err
}
_, err = io.Copy(f, part)
f.Close()
if err != nil {
shared.Log.Error(
"Failed to save image",
log.Ctx{"image": fp, "err": err})
return "", err
}
} else {
destName = filepath.Join(destDir, info.Fingerprint)
f, err := os.Create(destName)
if err != nil {
shared.Log.Error(
"Failed to save image",
log.Ctx{"image": fp, "err": err})
return "", err
}
_, err = io.Copy(f, body)
f.Close()
if err != nil {
shared.Log.Error(
"Failed to save image",
log.Ctx{"image": fp, "err": err})
return "", err
}
}
if protocol == "direct" {
imageMeta, err := getImageMetadata(destName)
if err != nil {
return "", err
}
info.Architecture = imageMeta.Architecture
info.CreationDate = time.Unix(imageMeta.CreationDate, 0)
info.ExpiryDate = time.Unix(imageMeta.ExpiryDate, 0)
info.Properties = imageMeta.Properties
}
// By default, make all downloaded images private
info.Public = false
_, err = imageBuildFromInfo(d, info)
if err != nil {
shared.Log.Error(
"Failed to create image",
log.Ctx{"image": fp, "err": err})
return "", err
}
if alias != fp {
id, _, err := dbImageGet(d.db, fp, false, true)
if err != nil {
return "", err
}
err = dbImageSourceInsert(d.db, id, server, protocol, "", alias)
if err != nil {
return "", err
}
}
shared.Log.Info(
"Download succeeded",
log.Ctx{"image": fp})
if forContainer {
return fp, dbImageLastAccessInit(d.db, fp)
}
return fp, nil
}
// ImageDownload checks if we have that Image Fingerprint else
// downloads the image from a remote server.
func (d *Daemon) ImageDownload(op *operation, server string, protocol string, certificate string, secret string, alias string, forContainer bool, autoUpdate bool) (string, error) {
var err error
var ss *shared.SimpleStreams
var ctxMap log.Ctx
if protocol == "" {
protocol = "lxd"
}
fp := alias
// Expand aliases
if protocol == "simplestreams" {
imageStreamCacheLock.Lock()
entry, _ := imageStreamCache[server]
if entry == nil || entry.expiry.Before(time.Now()) {
refresh := func() (*imageStreamCacheEntry, error) {
// Setup simplestreams client
ss, err = shared.SimpleStreamsClient(server, d.proxy)
if err != nil {
return nil, err
}
// Get all aliases
aliases, err := ss.ListAliases()
if err != nil {
return nil, err
}
// Get all fingerprints
images, err := ss.ListImages()
if err != nil {
return nil, err
}
fingerprints := []string{}
for _, image := range images {
fingerprints = append(fingerprints, image.Fingerprint)
}
// Generate cache entry
entry = &imageStreamCacheEntry{ss: ss, Aliases: aliases, Fingerprints: fingerprints, expiry: time.Now().Add(time.Hour)}
imageStreamCache[server] = entry
imageSaveStreamCache()
return entry, nil
}
newEntry, err := refresh()
if err == nil {
// Cache refreshed
entry = newEntry
} else if entry != nil {
// Failed to fetch entry but existing cache
shared.LogWarn("Unable to refresh cache, using stale entry", log.Ctx{"server": server})
entry.expiry = time.Now().Add(time.Hour)
} else {
// Failed to fetch entry and nothing in cache
imageStreamCacheLock.Unlock()
return "", err
}
} else {
shared.LogDebug("Using SimpleStreams cache entry", log.Ctx{"server": server, "expiry": entry.expiry})
ss = entry.ss
}
imageStreamCacheLock.Unlock()
// Expand aliases
for _, alias := range entry.Aliases {
if alias.Name != fp {
continue
}
fp = alias.Target
break
}
// Expand fingerprint
for _, fingerprint := range entry.Fingerprints {
if !strings.HasPrefix(fingerprint, fp) {
continue
}
if fp == alias {
alias = fingerprint
}
fp = fingerprint
break
}
} else if protocol == "lxd" {
target, err := remoteGetImageFingerprint(d, server, certificate, fp)
if err == nil && target != "" {
fp = target
}
}
if _, _, err := dbImageGet(d.db, fp, false, false); err == nil {
shared.LogDebug("Image already exists in the db", log.Ctx{"image": fp})
// already have it
return fp, nil
}
// Now check if we already downloading the image
d.imagesDownloadingLock.RLock()
if waitChannel, ok := d.imagesDownloading[fp]; ok {
// We already download the image
d.imagesDownloadingLock.RUnlock()
shared.LogDebug(
"Already downloading the image, waiting for it to succeed",
log.Ctx{"image": fp})
// Wait until the download finishes (channel closes)
if _, ok := <-waitChannel; ok {
shared.LogWarnf("Value transmitted over image lock semaphore?")
}
if _, _, err := dbImageGet(d.db, fp, false, true); err != nil {
shared.LogError(
"Previous download didn't succeed",
log.Ctx{"image": fp})
return "", fmt.Errorf("Previous download didn't succeed")
}
shared.LogDebug(
"Previous download succeeded",
log.Ctx{"image": fp})
return fp, nil
}
d.imagesDownloadingLock.RUnlock()
if op == nil {
ctxMap = log.Ctx{"alias": alias, "server": server}
} else {
ctxMap = log.Ctx{"trigger": op.url, "image": fp, "operation": op.id, "alias": alias, "server": server}
}
shared.LogInfo("Downloading image", ctxMap)
// Add the download to the queue
d.imagesDownloadingLock.Lock()
d.imagesDownloading[fp] = make(chan bool)
d.imagesDownloadingLock.Unlock()
// Unlock once this func ends.
defer func() {
d.imagesDownloadingLock.Lock()
if waitChannel, ok := d.imagesDownloading[fp]; ok {
close(waitChannel)
delete(d.imagesDownloading, fp)
}
d.imagesDownloadingLock.Unlock()
}()
exporturl := server
var info shared.ImageInfo
info.Fingerprint = fp
destDir := shared.VarPath("images")
destName := filepath.Join(destDir, fp)
if shared.PathExists(destName) {
d.Storage.ImageDelete(fp)
}
progress := func(progressInt int64, speedInt int64) {
if op == nil {
return
}
meta := op.metadata
if meta == nil {
meta = make(map[string]interface{})
}
progress := fmt.Sprintf("%d%% (%s/s)", progressInt, shared.GetByteSizeString(speedInt))
if meta["download_progress"] != progress {
meta["download_progress"] = progress
op.UpdateMetadata(meta)
}
}
if protocol == "lxd" {
/* grab the metadata from /1.0/images/%s */
var url string
if secret != "" {
url = fmt.Sprintf(
"%s/%s/images/%s?secret=%s",
server, shared.APIVersion, fp, secret)
} else {
url = fmt.Sprintf("%s/%s/images/%s", server, shared.APIVersion, fp)
}
resp, err := d.httpGetSync(url, certificate)
if err != nil {
shared.LogError(
"Failed to download image metadata",
log.Ctx{"image": fp, "err": err})
return "", err
}
if err := json.Unmarshal(resp.Metadata, &info); err != nil {
return "", err
}
/* now grab the actual file from /1.0/images/%s/export */
if secret != "" {
exporturl = fmt.Sprintf(
"%s/%s/images/%s/export?secret=%s",
server, shared.APIVersion, fp, secret)
} else {
exporturl = fmt.Sprintf(
"%s/%s/images/%s/export",
server, shared.APIVersion, fp)
}
} else if protocol == "simplestreams" {
err := ss.Download(fp, "meta", destName, nil)
if err != nil {
return "", err
}
err = ss.Download(fp, "root", destName+".rootfs", progress)
if err != nil {
return "", err
}
info, err := ss.GetImageInfo(fp)
if err != nil {
return "", err
}
info.Public = false
info.AutoUpdate = autoUpdate
_, err = imageBuildFromInfo(d, *info)
if err != nil {
return "", err
}
if alias != fp {
id, _, err := dbImageGet(d.db, fp, false, true)
if err != nil {
return "", err
}
err = dbImageSourceInsert(d.db, id, server, protocol, "", alias)
if err != nil {
return "", err
}
}
shared.LogInfo("Image downloaded", ctxMap)
if forContainer {
return fp, dbImageLastAccessInit(d.db, fp)
}
return fp, nil
}
raw, err := d.httpGetFile(exporturl, certificate)
if err != nil {
shared.LogError(
"Failed to download image",
log.Ctx{"image": fp, "err": err})
return "", err
}
info.Size = raw.ContentLength
ctype, ctypeParams, err := mime.ParseMediaType(raw.Header.Get("Content-Type"))
if err != nil {
ctype = "application/octet-stream"
}
body := &shared.ProgressReader{
ReadCloser: raw.Body,
Tracker: &shared.ProgressTracker{
Length: raw.ContentLength,
Handler: progress,
},
}
if ctype == "multipart/form-data" {
// Parse the POST data
mr := multipart.NewReader(body, ctypeParams["boundary"])
// Get the metadata tarball
part, err := mr.NextPart()
if err != nil {
shared.LogError(
"Invalid multipart image",
log.Ctx{"image": fp, "err": err})
return "", err
}
if part.FormName() != "metadata" {
shared.LogError(
"Invalid multipart image",
log.Ctx{"image": fp, "err": err})
return "", fmt.Errorf("Invalid multipart image")
}
destName = filepath.Join(destDir, info.Fingerprint)
f, err := os.Create(destName)
if err != nil {
shared.LogError(
"Failed to save image",
log.Ctx{"image": fp, "err": err})
return "", err
}
_, err = io.Copy(f, part)
f.Close()
if err != nil {
shared.LogError(
"Failed to save image",
log.Ctx{"image": fp, "err": err})
return "", err
}
// Get the rootfs tarball
part, err = mr.NextPart()
if err != nil {
shared.LogError(
"Invalid multipart image",
log.Ctx{"image": fp, "err": err})
return "", err
}
if part.FormName() != "rootfs" {
shared.LogError(
"Invalid multipart image",
log.Ctx{"image": fp})
return "", fmt.Errorf("Invalid multipart image")
}
destName = filepath.Join(destDir, info.Fingerprint+".rootfs")
f, err = os.Create(destName)
if err != nil {
shared.LogError(
"Failed to save image",
log.Ctx{"image": fp, "err": err})
return "", err
}
_, err = io.Copy(f, part)
f.Close()
if err != nil {
shared.LogError(
"Failed to save image",
log.Ctx{"image": fp, "err": err})
return "", err
}
} else {
destName = filepath.Join(destDir, info.Fingerprint)
f, err := os.Create(destName)
if err != nil {
shared.LogError(
"Failed to save image",
log.Ctx{"image": fp, "err": err})
return "", err
}
_, err = io.Copy(f, body)
f.Close()
if err != nil {
shared.LogError(
"Failed to save image",
log.Ctx{"image": fp, "err": err})
return "", err
}
}
if protocol == "direct" {
imageMeta, err := getImageMetadata(destName)
if err != nil {
return "", err
}
info.Architecture = imageMeta.Architecture
info.CreationDate = time.Unix(imageMeta.CreationDate, 0)
info.ExpiryDate = time.Unix(imageMeta.ExpiryDate, 0)
info.Properties = imageMeta.Properties
}
// By default, make all downloaded images private
info.Public = false
if alias != fp && secret == "" {
info.AutoUpdate = autoUpdate
}
_, err = imageBuildFromInfo(d, info)
if err != nil {
shared.LogError(
"Failed to create image",
log.Ctx{"image": fp, "err": err})
return "", err
}
if alias != fp {
id, _, err := dbImageGet(d.db, fp, false, true)
if err != nil {
return "", err
}
err = dbImageSourceInsert(d.db, id, server, protocol, "", alias)
if err != nil {
return "", err
}
}
shared.LogInfo("Image downloaded", ctxMap)
if forContainer {
return fp, dbImageLastAccessInit(d.db, fp)
}
return fp, nil
}