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daemon_images.go
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daemon_images.go
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package main
import (
"context"
"crypto/sha256"
"fmt"
"io"
"net/http"
"os"
"path/filepath"
"time"
"github.com/canonical/lxd/client"
"github.com/canonical/lxd/lxd/db"
"github.com/canonical/lxd/lxd/db/cluster"
"github.com/canonical/lxd/lxd/lifecycle"
"github.com/canonical/lxd/lxd/locking"
"github.com/canonical/lxd/lxd/operations"
"github.com/canonical/lxd/lxd/request"
"github.com/canonical/lxd/lxd/response"
"github.com/canonical/lxd/lxd/state"
"github.com/canonical/lxd/lxd/util"
"github.com/canonical/lxd/shared"
"github.com/canonical/lxd/shared/api"
"github.com/canonical/lxd/shared/cancel"
"github.com/canonical/lxd/shared/ioprogress"
"github.com/canonical/lxd/shared/logger"
"github.com/canonical/lxd/shared/units"
"github.com/canonical/lxd/shared/version"
)
// ImageDownloadArgs used with ImageDownload.
type ImageDownloadArgs struct {
ProjectName string
Server string
Protocol string
Certificate string
Secret string
Alias string
Type string
SetCached bool
PreferCached bool
AutoUpdate bool
Public bool
StoragePool string
Budget int64
SourceProjectName string
UserRequested bool
}
// imageOperationLock acquires a lock for operating on an image and returns the unlock function.
func imageOperationLock(fingerprint string) (locking.UnlockFunc, error) {
l := logger.AddContext(logger.Ctx{"fingerprint": fingerprint})
l.Debug("Acquiring lock for image")
defer l.Debug("Lock acquired for image")
return locking.Lock(context.TODO(), fmt.Sprintf("ImageOperation_%s", fingerprint))
}
// ImageDownload resolves the image fingerprint and if not in the database, downloads it.
func ImageDownload(r *http.Request, s *state.State, op *operations.Operation, args *ImageDownloadArgs) (*api.Image, error) {
var err error
var ctxMap logger.Ctx
var remote lxd.ImageServer
var info *api.Image
// Default protocol is LXD. Copy so that local modifications aren't propagated to args.
protocol := args.Protocol
if protocol == "" {
protocol = "lxd"
}
// Copy so that local modifications aren't propagated to args.
alias := args.Alias
// Default the fingerprint to the alias string we received
fp := alias
// Attempt to resolve the alias
if shared.ValueInSlice(protocol, []string{"lxd", "simplestreams"}) {
clientArgs := &lxd.ConnectionArgs{
TLSServerCert: args.Certificate,
UserAgent: version.UserAgent,
Proxy: s.Proxy,
CachePath: s.OS.CacheDir,
CacheExpiry: time.Hour,
}
if protocol == "lxd" {
// Setup LXD client
remote, err = lxd.ConnectPublicLXD(args.Server, clientArgs)
if err != nil {
return nil, fmt.Errorf("Failed to connect to LXD server %q: %w", args.Server, err)
}
server, ok := remote.(lxd.InstanceServer)
if ok {
remote = server.UseProject(args.SourceProjectName)
}
} else {
// Setup simplestreams client
remote, err = lxd.ConnectSimpleStreams(args.Server, clientArgs)
if err != nil {
return nil, fmt.Errorf("Failed to connect to simple streams server %q: %w", args.Server, err)
}
}
// For public images, handle aliases and initial metadata
if args.Secret == "" {
// Look for a matching alias
entry, _, err := remote.GetImageAliasType(args.Type, fp)
if err == nil {
fp = entry.Target
}
// Expand partial fingerprints
info, _, err = remote.GetImage(fp)
if err != nil {
return nil, fmt.Errorf("Failed getting remote image info: %w", err)
}
fp = info.Fingerprint
}
}
// Ensure we are the only ones operating on this image.
unlock, err := imageOperationLock(fp)
if err != nil {
return nil, err
}
defer unlock()
// If auto-update is on and we're being given the image by
// alias, try to use a locally cached image matching the given
// server/protocol/alias, regardless of whether it's stale or
// not (we can assume that it will be not *too* stale since
// auto-update is on).
interval := s.GlobalConfig.ImagesAutoUpdateIntervalHours()
if args.PreferCached && interval > 0 && alias != fp {
err = s.DB.Cluster.Transaction(context.TODO(), func(ctx context.Context, tx *db.ClusterTx) error {
for _, architecture := range s.OS.Architectures {
cachedFingerprint, err := tx.GetCachedImageSourceFingerprint(ctx, args.Server, args.Protocol, alias, args.Type, architecture)
if err == nil && cachedFingerprint != fp {
fp = cachedFingerprint
break
}
}
return nil
})
if err != nil {
return nil, err
}
}
var imgInfo *api.Image
err = s.DB.Cluster.Transaction(context.TODO(), func(ctx context.Context, tx *db.ClusterTx) error {
// Check if the image already exists in this project (partial hash match).
_, imgInfo, err = tx.GetImage(ctx, fp, cluster.ImageFilter{Project: &args.ProjectName})
return err
})
if err == nil {
var nodeAddress string
err = s.DB.Cluster.Transaction(context.TODO(), func(ctx context.Context, tx *db.ClusterTx) error {
// Check if the image is available locally or it's on another node.
nodeAddress, err = tx.LocateImage(ctx, imgInfo.Fingerprint)
return err
})
if err != nil {
return nil, fmt.Errorf("Failed locating image %q in the cluster: %w", imgInfo.Fingerprint, err)
}
if nodeAddress != "" {
// The image is available from another node, let's try to import it.
err = instanceImageTransfer(s, r, args.ProjectName, imgInfo.Fingerprint, nodeAddress)
if err != nil {
return nil, fmt.Errorf("Failed transferring image %q from %q: %w", imgInfo.Fingerprint, nodeAddress, err)
}
err = s.DB.Cluster.Transaction(context.TODO(), func(ctx context.Context, tx *db.ClusterTx) error {
// As the image record already exists in the project, just add the node ID to the image.
return tx.AddImageToLocalNode(ctx, args.ProjectName, imgInfo.Fingerprint)
})
if err != nil {
return nil, fmt.Errorf("Failed adding transferred image %q to local cluster member: %w", imgInfo.Fingerprint, err)
}
}
} else if response.IsNotFoundError(err) {
err = s.DB.Cluster.Transaction(context.TODO(), func(ctx context.Context, tx *db.ClusterTx) error {
// Check if the image already exists in some other project.
_, imgInfo, err = tx.GetImageFromAnyProject(ctx, fp)
return err
})
if err == nil {
var nodeAddress string
err = s.DB.Cluster.Transaction(context.TODO(), func(ctx context.Context, tx *db.ClusterTx) error {
// Check if the image is available locally or it's on another node. Do this before creating
// the missing DB record so we don't include ourself in the search results.
nodeAddress, err = tx.LocateImage(ctx, imgInfo.Fingerprint)
if err != nil {
return fmt.Errorf("Locate image %q in the cluster: %w", imgInfo.Fingerprint, err)
}
// We need to insert the database entry for this project, including the node ID entry.
err = tx.CreateImage(ctx, args.ProjectName, imgInfo.Fingerprint, imgInfo.Filename, imgInfo.Size, args.Public, imgInfo.AutoUpdate, imgInfo.Architecture, imgInfo.CreatedAt, imgInfo.ExpiresAt, imgInfo.Properties, imgInfo.Type, nil)
if err != nil {
return fmt.Errorf("Failed creating image record for project: %w", err)
}
// Mark the image as "cached" if downloading for an instance.
if args.SetCached {
err = tx.SetImageCachedAndLastUseDate(ctx, args.ProjectName, imgInfo.Fingerprint, time.Now().UTC())
if err != nil {
return fmt.Errorf("Failed setting cached flag and last use date: %w", err)
}
}
var id int
id, imgInfo, err = tx.GetImage(ctx, fp, cluster.ImageFilter{Project: &args.ProjectName})
if err != nil {
return err
}
return tx.CreateImageSource(ctx, id, args.Server, args.Protocol, args.Certificate, alias)
})
if err != nil {
return nil, err
}
// Transfer image if needed (after database record has been created above).
if nodeAddress != "" {
// The image is available from another node, let's try to import it.
err = instanceImageTransfer(s, r, args.ProjectName, info.Fingerprint, nodeAddress)
if err != nil {
return nil, fmt.Errorf("Failed transferring image: %w", err)
}
}
}
}
if imgInfo != nil {
info = imgInfo
ctxMap = logger.Ctx{"fingerprint": info.Fingerprint}
logger.Debug("Image already exists in the DB", ctxMap)
var poolID int64
var poolIDs []int64
err = s.DB.Cluster.Transaction(context.TODO(), func(ctx context.Context, tx *db.ClusterTx) error {
// If the image already exists, is cached and that it is
// requested to be downloaded from an explicit `image copy` operation, then disable its `cache` parameter
// so that it won't be candidate for auto removal.
if imgInfo.Cached && args.UserRequested {
err = tx.UnsetImageCached(ctx, args.ProjectName, imgInfo.Fingerprint)
if err != nil {
return err
}
}
if args.StoragePool != "" {
ctxMap["pool"] = args.StoragePool
// Get the ID of the target storage pool.
poolID, err = tx.GetStoragePoolID(ctx, args.StoragePool)
if err != nil {
return err
}
// Check if the image is already in the pool.
poolIDs, err = tx.GetPoolsWithImage(ctx, info.Fingerprint)
return err
}
return nil
})
if err != nil {
return nil, err
}
// If not requested in a particular pool, we're done.
if args.StoragePool == "" {
return info, nil
}
if shared.ValueInSlice(poolID, poolIDs) {
logger.Debug("Image already exists on storage pool", ctxMap)
return info, nil
}
// Import the image in the pool.
logger.Debug("Image does not exist on storage pool", ctxMap)
err = imageCreateInPool(s, info, args.StoragePool)
if err != nil {
ctxMap["err"] = err
logger.Debug("Failed to create image on storage pool", ctxMap)
return nil, fmt.Errorf("Failed to create image %q on storage pool %q: %w", info.Fingerprint, args.StoragePool, err)
}
logger.Debug("Created image on storage pool", ctxMap)
return info, nil
}
// Begin downloading
if op == nil {
ctxMap = logger.Ctx{"alias": alias, "server": args.Server}
} else {
ctxMap = logger.Ctx{"trigger": op.URL(), "fingerprint": fp, "operation": op.ID(), "alias": alias, "server": args.Server}
}
logger.Info("Downloading image", ctxMap)
// Cleanup any leftover from a past attempt
destDir := shared.VarPath("images")
destName := filepath.Join(destDir, fp)
failure := true
cleanup := func() {
if failure {
_ = os.Remove(destName)
_ = os.Remove(destName + ".rootfs")
}
}
defer cleanup()
// Setup a progress handler
progress := func(progress ioprogress.ProgressData) {
if op == nil {
return
}
meta := op.Metadata()
if meta == nil {
meta = make(map[string]any)
}
if meta["download_progress"] != progress.Text {
meta["download_progress"] = progress.Text
_ = op.UpdateMetadata(meta)
}
}
var canceler *cancel.HTTPRequestCanceller
if op != nil {
canceler = cancel.NewHTTPRequestCanceller()
op.SetCanceler(canceler)
}
if protocol == "lxd" || protocol == "simplestreams" {
// Create the target files
dest, err := os.Create(destName)
if err != nil {
return nil, err
}
defer func() { _ = dest.Close() }()
destRootfs, err := os.Create(destName + ".rootfs")
if err != nil {
return nil, err
}
defer func() { _ = destRootfs.Close() }()
// Get the image information
if info == nil {
if args.Secret != "" {
info, _, err = remote.GetPrivateImage(fp, args.Secret)
if err != nil {
return nil, err
}
// Expand the fingerprint now and mark alias string to match
fp = info.Fingerprint
alias = info.Fingerprint
} else {
info, _, err = remote.GetImage(fp)
if err != nil {
return nil, err
}
}
}
// Compatibility with older LXD servers
if info.Type == "" {
info.Type = "container"
}
if args.Budget > 0 && info.Size > args.Budget {
return nil, fmt.Errorf("Remote image with size %d exceeds allowed bugdget of %d", info.Size, args.Budget)
}
// Download the image
var resp *lxd.ImageFileResponse
request := lxd.ImageFileRequest{
MetaFile: io.WriteSeeker(dest),
RootfsFile: io.WriteSeeker(destRootfs),
ProgressHandler: progress,
Canceler: canceler,
DeltaSourceRetriever: func(fingerprint string, file string) string {
path := shared.VarPath("images", fmt.Sprintf("%s.%s", fingerprint, file))
if shared.PathExists(path) {
return path
}
return ""
},
}
if args.Secret != "" {
resp, err = remote.GetPrivateImageFile(fp, args.Secret, request)
} else {
resp, err = remote.GetImageFile(fp, request)
}
if err != nil {
return nil, err
}
// Truncate down to size
if resp.RootfsSize > 0 {
err = destRootfs.Truncate(resp.RootfsSize)
if err != nil {
return nil, err
}
}
err = dest.Truncate(resp.MetaSize)
if err != nil {
return nil, err
}
// Deal with unified images
if resp.RootfsSize == 0 {
err := os.Remove(destName + ".rootfs")
if err != nil {
return nil, err
}
}
err = dest.Close()
if err != nil {
return nil, err
}
err = destRootfs.Close()
if err != nil {
return nil, err
}
} else if protocol == "direct" {
// Setup HTTP client
httpClient, err := util.HTTPClient(args.Certificate, s.Proxy)
if err != nil {
return nil, err
}
// Use relatively short response header timeout so as not to hold the image lock open too long.
httpTransport, ok := httpClient.Transport.(*http.Transport)
if !ok {
return nil, fmt.Errorf("Invalid http client type")
}
httpTransport.ResponseHeaderTimeout = 30 * time.Second
req, err := http.NewRequest("GET", args.Server, nil)
if err != nil {
return nil, err
}
req.Header.Set("User-Agent", version.UserAgent)
// Make the request
raw, doneCh, err := cancel.CancelableDownload(canceler, httpClient.Do, req)
if err != nil {
return nil, err
}
defer close(doneCh)
if raw.StatusCode != http.StatusOK {
return nil, fmt.Errorf("Unable to fetch %q: %s", args.Server, raw.Status)
}
// Progress handler
body := &ioprogress.ProgressReader{
ReadCloser: raw.Body,
Tracker: &ioprogress.ProgressTracker{
Length: raw.ContentLength,
Handler: func(percent int64, speed int64) {
progress(ioprogress.ProgressData{Text: fmt.Sprintf("%d%% (%s/s)", percent, units.GetByteSizeString(speed, 2))})
},
},
}
// Create the target files
f, err := os.Create(destName)
if err != nil {
return nil, err
}
defer func() { _ = f.Close() }()
// Hashing
sha256 := sha256.New()
// Download the image
writer := shared.NewQuotaWriter(io.MultiWriter(f, sha256), args.Budget)
size, err := io.Copy(writer, body)
if err != nil {
return nil, err
}
// Validate hash
result := fmt.Sprintf("%x", sha256.Sum(nil))
if result != fp {
return nil, fmt.Errorf("Hash mismatch for %q: %s != %s", args.Server, result, fp)
}
// Parse the image
imageMeta, imageType, err := getImageMetadata(destName)
if err != nil {
return nil, err
}
info = &api.Image{}
info.Fingerprint = fp
info.Size = size
info.Architecture = imageMeta.Architecture
info.CreatedAt = time.Unix(imageMeta.CreationDate, 0)
info.ExpiresAt = time.Unix(imageMeta.ExpiryDate, 0)
info.Properties = imageMeta.Properties
info.Type = imageType
err = f.Close()
if err != nil {
return nil, err
}
} else {
return nil, fmt.Errorf("Unsupported protocol: %v", protocol)
}
// Override visiblity
info.Public = args.Public
// We want to enable auto-update only if we were passed an
// alias name, so we can figure when the associated
// fingerprint changes in the remote.
if alias != fp {
info.AutoUpdate = args.AutoUpdate
}
err = s.DB.Cluster.Transaction(context.TODO(), func(ctx context.Context, tx *db.ClusterTx) error {
// Create the database entry
return tx.CreateImage(ctx, args.ProjectName, info.Fingerprint, info.Filename, info.Size, info.Public, info.AutoUpdate, info.Architecture, info.CreatedAt, info.ExpiresAt, info.Properties, info.Type, nil)
})
if err != nil {
return nil, fmt.Errorf("Failed creating image record: %w", err)
}
// Image is in the DB now, don't wipe on-disk files on failure
failure = false
// Check if the image path changed (private images)
newDestName := filepath.Join(destDir, fp)
if newDestName != destName {
err = shared.FileMove(destName, newDestName)
if err != nil {
return nil, err
}
if shared.PathExists(destName + ".rootfs") {
err = shared.FileMove(destName+".rootfs", newDestName+".rootfs")
if err != nil {
return nil, err
}
}
}
// Record the image source
if alias != fp {
err = s.DB.Cluster.Transaction(context.TODO(), func(ctx context.Context, tx *db.ClusterTx) error {
id, _, err := tx.GetImage(ctx, fp, cluster.ImageFilter{Project: &args.ProjectName})
if err != nil {
return err
}
return tx.CreateImageSource(ctx, id, args.Server, protocol, args.Certificate, alias)
})
if err != nil {
return nil, err
}
}
// Import into the requested storage pool
if args.StoragePool != "" {
err = imageCreateInPool(s, info, args.StoragePool)
if err != nil {
return nil, err
}
}
// Mark the image as "cached" if downloading for an instance
if args.SetCached {
err = s.DB.Cluster.Transaction(context.TODO(), func(ctx context.Context, tx *db.ClusterTx) error {
return tx.SetImageCachedAndLastUseDate(ctx, args.ProjectName, fp, time.Now().UTC())
})
if err != nil {
return nil, fmt.Errorf("Failed setting cached flag and last use date: %w", err)
}
}
logger.Info("Image downloaded", ctxMap)
var requestor *api.EventLifecycleRequestor
if op != nil {
requestor = op.Requestor()
} else if r != nil {
requestor = request.CreateRequestor(r)
}
s.Events.SendLifecycle(args.ProjectName, lifecycle.ImageCreated.Event(info.Fingerprint, args.ProjectName, requestor, logger.Ctx{"type": info.Type}))
return info, nil
}