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forgejo/routers/api/packages/container/container.go
KN4CK3R a1ae83f36e
Workaround for container registry push/pull errors (#21862)
This PR addresses #19586

I added a mutex to the upload version creation which will prevent the
push errors when two requests try to create these database entries. I'm
not sure if this should be the final solution for this problem.

I added a workaround to allow a reupload of missing blobs. Normally a
reupload is skipped because the database knows the blob is already
present. The workaround checks if the blob exists on the file system.
This should not be needed anymore with the above fix so I marked this
code to be removed with Gitea v1.20.

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
2022-11-25 13:47:46 +08:00

712 lines
20 KiB
Go

// Copyright 2021 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package container
import (
"errors"
"fmt"
"io"
"net/http"
"net/url"
"os"
"regexp"
"strconv"
"strings"
packages_model "code.gitea.io/gitea/models/packages"
container_model "code.gitea.io/gitea/models/packages/container"
user_model "code.gitea.io/gitea/models/user"
"code.gitea.io/gitea/modules/context"
"code.gitea.io/gitea/modules/json"
"code.gitea.io/gitea/modules/log"
packages_module "code.gitea.io/gitea/modules/packages"
container_module "code.gitea.io/gitea/modules/packages/container"
"code.gitea.io/gitea/modules/packages/container/oci"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/util"
"code.gitea.io/gitea/routers/api/packages/helper"
packages_service "code.gitea.io/gitea/services/packages"
container_service "code.gitea.io/gitea/services/packages/container"
)
// maximum size of a container manifest
// https://github.com/opencontainers/distribution-spec/blob/main/spec.md#pushing-manifests
const maxManifestSize = 10 * 1024 * 1024
var imageNamePattern = regexp.MustCompile(`\A[a-z0-9]+([._-][a-z0-9]+)*(/[a-z0-9]+([._-][a-z0-9]+)*)*\z`)
type containerHeaders struct {
Status int
ContentDigest string
UploadUUID string
Range string
Location string
ContentType string
ContentLength int64
}
// https://github.com/opencontainers/distribution-spec/blob/main/spec.md#legacy-docker-support-http-headers
func setResponseHeaders(resp http.ResponseWriter, h *containerHeaders) {
if h.Location != "" {
resp.Header().Set("Location", h.Location)
}
if h.Range != "" {
resp.Header().Set("Range", h.Range)
}
if h.ContentType != "" {
resp.Header().Set("Content-Type", h.ContentType)
}
if h.ContentLength != 0 {
resp.Header().Set("Content-Length", strconv.FormatInt(h.ContentLength, 10))
}
if h.UploadUUID != "" {
resp.Header().Set("Docker-Upload-Uuid", h.UploadUUID)
}
if h.ContentDigest != "" {
resp.Header().Set("Docker-Content-Digest", h.ContentDigest)
resp.Header().Set("ETag", fmt.Sprintf(`"%s"`, h.ContentDigest))
}
resp.Header().Set("Docker-Distribution-Api-Version", "registry/2.0")
resp.WriteHeader(h.Status)
}
func jsonResponse(ctx *context.Context, status int, obj interface{}) {
setResponseHeaders(ctx.Resp, &containerHeaders{
Status: status,
ContentType: "application/json",
})
if err := json.NewEncoder(ctx.Resp).Encode(obj); err != nil {
log.Error("JSON encode: %v", err)
}
}
func apiError(ctx *context.Context, status int, err error) {
helper.LogAndProcessError(ctx, status, err, func(message string) {
setResponseHeaders(ctx.Resp, &containerHeaders{
Status: status,
})
})
}
// https://github.com/opencontainers/distribution-spec/blob/main/spec.md#error-codes
func apiErrorDefined(ctx *context.Context, err *namedError) {
type ContainerError struct {
Code string `json:"code"`
Message string `json:"message"`
}
type ContainerErrors struct {
Errors []ContainerError `json:"errors"`
}
jsonResponse(ctx, err.StatusCode, ContainerErrors{
Errors: []ContainerError{
{
Code: err.Code,
Message: err.Message,
},
},
})
}
// ReqContainerAccess is a middleware which checks the current user valid (real user or ghost for anonymous access)
func ReqContainerAccess(ctx *context.Context) {
if ctx.Doer == nil {
ctx.Resp.Header().Add("WWW-Authenticate", `Bearer realm="`+setting.AppURL+`v2/token",service="container_registry",scope="*"`)
apiErrorDefined(ctx, errUnauthorized)
}
}
// VerifyImageName is a middleware which checks if the image name is allowed
func VerifyImageName(ctx *context.Context) {
if !imageNamePattern.MatchString(ctx.Params("image")) {
apiErrorDefined(ctx, errNameInvalid)
}
}
// DetermineSupport is used to test if the registry supports OCI
// https://github.com/opencontainers/distribution-spec/blob/main/spec.md#determining-support
func DetermineSupport(ctx *context.Context) {
setResponseHeaders(ctx.Resp, &containerHeaders{
Status: http.StatusOK,
})
}
// Authenticate creates a token for the current user
// If the current user is anonymous, the ghost user is used
func Authenticate(ctx *context.Context) {
u := ctx.Doer
if u == nil {
u = user_model.NewGhostUser()
}
token, err := packages_service.CreateAuthorizationToken(u)
if err != nil {
apiError(ctx, http.StatusInternalServerError, err)
return
}
ctx.JSON(http.StatusOK, map[string]string{
"token": token,
})
}
// https://docs.docker.com/registry/spec/api/#listing-repositories
func GetRepositoryList(ctx *context.Context) {
n := ctx.FormInt("n")
if n <= 0 || n > 100 {
n = 100
}
last := ctx.FormTrim("last")
repositories, err := container_model.GetRepositories(ctx, ctx.Doer, n, last)
if err != nil {
apiError(ctx, http.StatusInternalServerError, err)
return
}
type RepositoryList struct {
Repositories []string `json:"repositories"`
}
if len(repositories) == n {
v := url.Values{}
if n > 0 {
v.Add("n", strconv.Itoa(n))
}
v.Add("last", repositories[len(repositories)-1])
ctx.Resp.Header().Set("Link", fmt.Sprintf(`</v2/_catalog?%s>; rel="next"`, v.Encode()))
}
jsonResponse(ctx, http.StatusOK, RepositoryList{
Repositories: repositories,
})
}
// https://github.com/opencontainers/distribution-spec/blob/main/spec.md#mounting-a-blob-from-another-repository
// https://github.com/opencontainers/distribution-spec/blob/main/spec.md#single-post
// https://github.com/opencontainers/distribution-spec/blob/main/spec.md#pushing-a-blob-in-chunks
func InitiateUploadBlob(ctx *context.Context) {
image := ctx.Params("image")
mount := ctx.FormTrim("mount")
from := ctx.FormTrim("from")
if mount != "" {
blob, _ := workaroundGetContainerBlob(ctx, &container_model.BlobSearchOptions{
Image: from,
Digest: mount,
})
if blob != nil {
setResponseHeaders(ctx.Resp, &containerHeaders{
Location: fmt.Sprintf("/v2/%s/%s/blobs/%s", ctx.Package.Owner.LowerName, image, mount),
ContentDigest: mount,
Status: http.StatusCreated,
})
return
}
}
digest := ctx.FormTrim("digest")
if digest != "" {
buf, err := packages_module.CreateHashedBufferFromReader(ctx.Req.Body, 32*1024*1024)
if err != nil {
apiError(ctx, http.StatusInternalServerError, err)
return
}
defer buf.Close()
if digest != digestFromHashSummer(buf) {
apiErrorDefined(ctx, errDigestInvalid)
return
}
if _, err := saveAsPackageBlob(buf, &packages_service.PackageInfo{Owner: ctx.Package.Owner, Name: image}); err != nil {
apiError(ctx, http.StatusInternalServerError, err)
return
}
setResponseHeaders(ctx.Resp, &containerHeaders{
Location: fmt.Sprintf("/v2/%s/%s/blobs/%s", ctx.Package.Owner.LowerName, image, digest),
ContentDigest: digest,
Status: http.StatusCreated,
})
return
}
upload, err := packages_model.CreateBlobUpload(ctx)
if err != nil {
apiError(ctx, http.StatusInternalServerError, err)
return
}
setResponseHeaders(ctx.Resp, &containerHeaders{
Location: fmt.Sprintf("/v2/%s/%s/blobs/uploads/%s", ctx.Package.Owner.LowerName, image, upload.ID),
Range: "0-0",
UploadUUID: upload.ID,
Status: http.StatusAccepted,
})
}
// https://docs.docker.com/registry/spec/api/#get-blob-upload
func GetUploadBlob(ctx *context.Context) {
uuid := ctx.Params("uuid")
upload, err := packages_model.GetBlobUploadByID(ctx, uuid)
if err != nil {
if err == packages_model.ErrPackageBlobUploadNotExist {
apiErrorDefined(ctx, errBlobUploadUnknown)
} else {
apiError(ctx, http.StatusInternalServerError, err)
}
return
}
setResponseHeaders(ctx.Resp, &containerHeaders{
Range: fmt.Sprintf("0-%d", upload.BytesReceived),
UploadUUID: upload.ID,
Status: http.StatusNoContent,
})
}
// https://github.com/opencontainers/distribution-spec/blob/main/spec.md#pushing-a-blob-in-chunks
func UploadBlob(ctx *context.Context) {
image := ctx.Params("image")
uploader, err := container_service.NewBlobUploader(ctx, ctx.Params("uuid"))
if err != nil {
if err == packages_model.ErrPackageBlobUploadNotExist {
apiErrorDefined(ctx, errBlobUploadUnknown)
} else {
apiError(ctx, http.StatusInternalServerError, err)
}
return
}
defer uploader.Close()
contentRange := ctx.Req.Header.Get("Content-Range")
if contentRange != "" {
start, end := 0, 0
if _, err := fmt.Sscanf(contentRange, "%d-%d", &start, &end); err != nil {
apiErrorDefined(ctx, errBlobUploadInvalid)
return
}
if int64(start) != uploader.Size() {
apiErrorDefined(ctx, errBlobUploadInvalid.WithStatusCode(http.StatusRequestedRangeNotSatisfiable))
return
}
} else if uploader.Size() != 0 {
apiErrorDefined(ctx, errBlobUploadInvalid.WithMessage("Stream uploads after first write are not allowed"))
return
}
if err := uploader.Append(ctx, ctx.Req.Body); err != nil {
apiError(ctx, http.StatusInternalServerError, err)
return
}
setResponseHeaders(ctx.Resp, &containerHeaders{
Location: fmt.Sprintf("/v2/%s/%s/blobs/uploads/%s", ctx.Package.Owner.LowerName, image, uploader.ID),
Range: fmt.Sprintf("0-%d", uploader.Size()-1),
UploadUUID: uploader.ID,
Status: http.StatusAccepted,
})
}
// https://github.com/opencontainers/distribution-spec/blob/main/spec.md#pushing-a-blob-in-chunks
func EndUploadBlob(ctx *context.Context) {
image := ctx.Params("image")
digest := ctx.FormTrim("digest")
if digest == "" {
apiErrorDefined(ctx, errDigestInvalid)
return
}
uploader, err := container_service.NewBlobUploader(ctx, ctx.Params("uuid"))
if err != nil {
if err == packages_model.ErrPackageBlobUploadNotExist {
apiErrorDefined(ctx, errBlobUploadUnknown)
} else {
apiError(ctx, http.StatusInternalServerError, err)
}
return
}
close := true
defer func() {
if close {
uploader.Close()
}
}()
if ctx.Req.Body != nil {
if err := uploader.Append(ctx, ctx.Req.Body); err != nil {
apiError(ctx, http.StatusInternalServerError, err)
return
}
}
if digest != digestFromHashSummer(uploader) {
apiErrorDefined(ctx, errDigestInvalid)
return
}
if _, err := saveAsPackageBlob(uploader, &packages_service.PackageInfo{Owner: ctx.Package.Owner, Name: image}); err != nil {
apiError(ctx, http.StatusInternalServerError, err)
return
}
if err := uploader.Close(); err != nil {
apiError(ctx, http.StatusInternalServerError, err)
return
}
close = false
if err := container_service.RemoveBlobUploadByID(ctx, uploader.ID); err != nil {
apiError(ctx, http.StatusInternalServerError, err)
return
}
setResponseHeaders(ctx.Resp, &containerHeaders{
Location: fmt.Sprintf("/v2/%s/%s/blobs/%s", ctx.Package.Owner.LowerName, image, digest),
ContentDigest: digest,
Status: http.StatusCreated,
})
}
// https://docs.docker.com/registry/spec/api/#delete-blob-upload
func CancelUploadBlob(ctx *context.Context) {
uuid := ctx.Params("uuid")
_, err := packages_model.GetBlobUploadByID(ctx, uuid)
if err != nil {
if err == packages_model.ErrPackageBlobUploadNotExist {
apiErrorDefined(ctx, errBlobUploadUnknown)
} else {
apiError(ctx, http.StatusInternalServerError, err)
}
return
}
if err := container_service.RemoveBlobUploadByID(ctx, uuid); err != nil {
apiError(ctx, http.StatusInternalServerError, err)
return
}
setResponseHeaders(ctx.Resp, &containerHeaders{
Status: http.StatusNoContent,
})
}
func getBlobFromContext(ctx *context.Context) (*packages_model.PackageFileDescriptor, error) {
digest := ctx.Params("digest")
if !oci.Digest(digest).Validate() {
return nil, container_model.ErrContainerBlobNotExist
}
return workaroundGetContainerBlob(ctx, &container_model.BlobSearchOptions{
OwnerID: ctx.Package.Owner.ID,
Image: ctx.Params("image"),
Digest: digest,
})
}
// https://github.com/opencontainers/distribution-spec/blob/main/spec.md#checking-if-content-exists-in-the-registry
func HeadBlob(ctx *context.Context) {
blob, err := getBlobFromContext(ctx)
if err != nil {
if err == container_model.ErrContainerBlobNotExist {
apiErrorDefined(ctx, errBlobUnknown)
} else {
apiError(ctx, http.StatusInternalServerError, err)
}
return
}
setResponseHeaders(ctx.Resp, &containerHeaders{
ContentDigest: blob.Properties.GetByName(container_module.PropertyDigest),
ContentLength: blob.Blob.Size,
Status: http.StatusOK,
})
}
// https://github.com/opencontainers/distribution-spec/blob/main/spec.md#pulling-blobs
func GetBlob(ctx *context.Context) {
blob, err := getBlobFromContext(ctx)
if err != nil {
if err == container_model.ErrContainerBlobNotExist {
apiErrorDefined(ctx, errBlobUnknown)
} else {
apiError(ctx, http.StatusInternalServerError, err)
}
return
}
s, _, err := packages_service.GetPackageFileStream(ctx, blob.File)
if err != nil {
apiError(ctx, http.StatusInternalServerError, err)
return
}
defer s.Close()
setResponseHeaders(ctx.Resp, &containerHeaders{
ContentDigest: blob.Properties.GetByName(container_module.PropertyDigest),
ContentType: blob.Properties.GetByName(container_module.PropertyMediaType),
ContentLength: blob.Blob.Size,
Status: http.StatusOK,
})
if _, err := io.Copy(ctx.Resp, s); err != nil {
log.Error("Error whilst copying content to response: %v", err)
}
}
// https://github.com/opencontainers/distribution-spec/blob/main/spec.md#deleting-blobs
func DeleteBlob(ctx *context.Context) {
digest := ctx.Params("digest")
if !oci.Digest(digest).Validate() {
apiErrorDefined(ctx, errBlobUnknown)
return
}
if err := deleteBlob(ctx.Package.Owner.ID, ctx.Params("image"), digest); err != nil {
apiError(ctx, http.StatusInternalServerError, err)
return
}
setResponseHeaders(ctx.Resp, &containerHeaders{
Status: http.StatusAccepted,
})
}
// https://github.com/opencontainers/distribution-spec/blob/main/spec.md#pushing-manifests
func UploadManifest(ctx *context.Context) {
reference := ctx.Params("reference")
mci := &manifestCreationInfo{
MediaType: oci.MediaType(ctx.Req.Header.Get("Content-Type")),
Owner: ctx.Package.Owner,
Creator: ctx.Doer,
Image: ctx.Params("image"),
Reference: reference,
IsTagged: !oci.Digest(reference).Validate(),
}
if mci.IsTagged && !oci.Reference(reference).Validate() {
apiErrorDefined(ctx, errManifestInvalid.WithMessage("Tag is invalid"))
return
}
maxSize := maxManifestSize + 1
buf, err := packages_module.CreateHashedBufferFromReader(&io.LimitedReader{R: ctx.Req.Body, N: int64(maxSize)}, maxSize)
if err != nil {
apiError(ctx, http.StatusInternalServerError, err)
return
}
defer buf.Close()
if buf.Size() > maxManifestSize {
apiErrorDefined(ctx, errManifestInvalid.WithMessage("Manifest exceeds maximum size").WithStatusCode(http.StatusRequestEntityTooLarge))
return
}
digest, err := processManifest(mci, buf)
if err != nil {
var namedError *namedError
if errors.As(err, &namedError) {
apiErrorDefined(ctx, namedError)
} else if errors.Is(err, container_model.ErrContainerBlobNotExist) {
apiErrorDefined(ctx, errBlobUnknown)
} else {
apiError(ctx, http.StatusInternalServerError, err)
}
return
}
setResponseHeaders(ctx.Resp, &containerHeaders{
Location: fmt.Sprintf("/v2/%s/%s/manifests/%s", ctx.Package.Owner.LowerName, mci.Image, reference),
ContentDigest: digest,
Status: http.StatusCreated,
})
}
func getManifestFromContext(ctx *context.Context) (*packages_model.PackageFileDescriptor, error) {
reference := ctx.Params("reference")
opts := &container_model.BlobSearchOptions{
OwnerID: ctx.Package.Owner.ID,
Image: ctx.Params("image"),
IsManifest: true,
}
if oci.Digest(reference).Validate() {
opts.Digest = reference
} else if oci.Reference(reference).Validate() {
opts.Tag = reference
} else {
return nil, container_model.ErrContainerBlobNotExist
}
return workaroundGetContainerBlob(ctx, opts)
}
// https://github.com/opencontainers/distribution-spec/blob/main/spec.md#checking-if-content-exists-in-the-registry
func HeadManifest(ctx *context.Context) {
manifest, err := getManifestFromContext(ctx)
if err != nil {
if err == container_model.ErrContainerBlobNotExist {
apiErrorDefined(ctx, errManifestUnknown)
} else {
apiError(ctx, http.StatusInternalServerError, err)
}
return
}
setResponseHeaders(ctx.Resp, &containerHeaders{
ContentDigest: manifest.Properties.GetByName(container_module.PropertyDigest),
ContentType: manifest.Properties.GetByName(container_module.PropertyMediaType),
ContentLength: manifest.Blob.Size,
Status: http.StatusOK,
})
}
// https://github.com/opencontainers/distribution-spec/blob/main/spec.md#pulling-manifests
func GetManifest(ctx *context.Context) {
manifest, err := getManifestFromContext(ctx)
if err != nil {
if err == container_model.ErrContainerBlobNotExist {
apiErrorDefined(ctx, errManifestUnknown)
} else {
apiError(ctx, http.StatusInternalServerError, err)
}
return
}
s, _, err := packages_service.GetPackageFileStream(ctx, manifest.File)
if err != nil {
apiError(ctx, http.StatusInternalServerError, err)
return
}
defer s.Close()
setResponseHeaders(ctx.Resp, &containerHeaders{
ContentDigest: manifest.Properties.GetByName(container_module.PropertyDigest),
ContentType: manifest.Properties.GetByName(container_module.PropertyMediaType),
ContentLength: manifest.Blob.Size,
Status: http.StatusOK,
})
if _, err := io.Copy(ctx.Resp, s); err != nil {
log.Error("Error whilst copying content to response: %v", err)
}
}
// https://github.com/opencontainers/distribution-spec/blob/main/spec.md#deleting-tags
// https://github.com/opencontainers/distribution-spec/blob/main/spec.md#deleting-manifests
func DeleteManifest(ctx *context.Context) {
reference := ctx.Params("reference")
opts := &container_model.BlobSearchOptions{
OwnerID: ctx.Package.Owner.ID,
Image: ctx.Params("image"),
IsManifest: true,
}
if oci.Digest(reference).Validate() {
opts.Digest = reference
} else if oci.Reference(reference).Validate() {
opts.Tag = reference
} else {
apiErrorDefined(ctx, errManifestUnknown)
return
}
pvs, err := container_model.GetManifestVersions(ctx, opts)
if err != nil {
apiError(ctx, http.StatusInternalServerError, err)
return
}
if len(pvs) == 0 {
apiErrorDefined(ctx, errManifestUnknown)
return
}
for _, pv := range pvs {
if err := packages_service.RemovePackageVersion(ctx.Doer, pv); err != nil {
apiError(ctx, http.StatusInternalServerError, err)
return
}
}
setResponseHeaders(ctx.Resp, &containerHeaders{
Status: http.StatusAccepted,
})
}
// https://github.com/opencontainers/distribution-spec/blob/main/spec.md#content-discovery
func GetTagList(ctx *context.Context) {
image := ctx.Params("image")
if _, err := packages_model.GetPackageByName(ctx, ctx.Package.Owner.ID, packages_model.TypeContainer, image); err != nil {
if err == packages_model.ErrPackageNotExist {
apiErrorDefined(ctx, errNameUnknown)
} else {
apiError(ctx, http.StatusInternalServerError, err)
}
return
}
n := -1
if ctx.FormTrim("n") != "" {
n = ctx.FormInt("n")
}
last := ctx.FormTrim("last")
tags, err := container_model.GetImageTags(ctx, ctx.Package.Owner.ID, image, n, last)
if err != nil {
apiError(ctx, http.StatusInternalServerError, err)
return
}
type TagList struct {
Name string `json:"name"`
Tags []string `json:"tags"`
}
if len(tags) > 0 {
v := url.Values{}
if n > 0 {
v.Add("n", strconv.Itoa(n))
}
v.Add("last", tags[len(tags)-1])
ctx.Resp.Header().Set("Link", fmt.Sprintf(`</v2/%s/%s/tags/list?%s>; rel="next"`, ctx.Package.Owner.LowerName, image, v.Encode()))
}
jsonResponse(ctx, http.StatusOK, TagList{
Name: strings.ToLower(ctx.Package.Owner.LowerName + "/" + image),
Tags: tags,
})
}
// FIXME: Workaround to be removed in v1.20
// https://github.com/go-gitea/gitea/issues/19586
func workaroundGetContainerBlob(ctx *context.Context, opts *container_model.BlobSearchOptions) (*packages_model.PackageFileDescriptor, error) {
blob, err := container_model.GetContainerBlob(ctx, opts)
if err != nil {
return nil, err
}
err = packages_module.NewContentStore().Has(packages_module.BlobHash256Key(blob.Blob.HashSHA256))
if err != nil {
if errors.Is(err, util.ErrNotExist) || errors.Is(err, os.ErrNotExist) {
log.Debug("Package registry inconsistent: blob %s does not exist on file system", blob.Blob.HashSHA256)
return nil, container_model.ErrContainerBlobNotExist
}
return nil, err
}
return blob, nil
}