diff options
| -rw-r--r-- | pkg/api/handlers/compat/containers_archive.go | 341 |
1 files changed, 337 insertions, 4 deletions
diff --git a/pkg/api/handlers/compat/containers_archive.go b/pkg/api/handlers/compat/containers_archive.go index 293a17e0f..f42a821cd 100644 --- a/pkg/api/handlers/compat/containers_archive.go +++ b/pkg/api/handlers/compat/containers_archive.go @@ -1,12 +1,345 @@ package compat import ( - "errors" - "net/http" - + "bytes" + "encoding/base64" + "encoding/json" + "fmt" + "github.com/containers/buildah/copier" + "github.com/containers/buildah/pkg/chrootuser" + "github.com/containers/podman/v2/libpod" + "github.com/containers/podman/v2/libpod/define" "github.com/containers/podman/v2/pkg/api/handlers/utils" + "github.com/containers/storage/pkg/idtools" + "github.com/opencontainers/runtime-spec/specs-go" + "path/filepath" + "strings" + + "github.com/gorilla/schema" + "github.com/pkg/errors" + "github.com/sirupsen/logrus" + "net/http" + "os" + "time" ) func Archive(w http.ResponseWriter, r *http.Request) { - utils.Error(w, "not implemented", http.StatusNotImplemented, errors.New("not implemented")) + decoder := r.Context().Value("decoder").(*schema.Decoder) + runtime := r.Context().Value("runtime").(*libpod.Runtime) + + switch r.Method { + case http.MethodPut: + handlePut(w, r, decoder, runtime) + case http.MethodGet, http.MethodHead: + handleHeadOrGet(w, r, decoder, runtime) + default: + utils.Error(w, fmt.Sprintf("not implemented, method: %v", r.Method), http.StatusNotImplemented, errors.New(fmt.Sprintf("not implemented, method: %v", r.Method))) + } +} + +func handleHeadOrGet(w http.ResponseWriter, r *http.Request, decoder *schema.Decoder, runtime *libpod.Runtime) { + query := struct { + Path string `schema:"path"` + }{} + + err := decoder.Decode(&query, r.URL.Query()) + if err != nil { + utils.Error(w, "Bad Request.", http.StatusBadRequest, errors.Wrap(err, "couldn't decode the query")) + return + } + if query.Path == "" { + utils.Error(w, "Bad Request.", http.StatusBadRequest, errors.New("missing `path` parameter")) + return + } + + containerName := utils.GetName(r) + + ctr, err := runtime.LookupContainer(containerName) + if errors.Cause(err) == define.ErrNoSuchCtr { + utils.Error(w, "Not found.", http.StatusNotFound, errors.Wrap(err, "the container doesn't exists")) + return + } else if err != nil { + utils.Error(w, "Something went wrong.", http.StatusInternalServerError, err) + return + } + mountPoint, err := ctr.Mount() + if err != nil { + utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "failed to mount the container")) + return + } + defer func() { + if err := ctr.Unmount(true); err != nil { + logrus.Warnf("failed to unmount container %s: %q", containerName, err) + } + }() + + opts := copier.StatOptions{} + + mountPoint, path, err := fixUpMountPointAndPath(runtime, ctr, mountPoint, query.Path) + if err != nil { + utils.Error(w, "Something went wrong.", http.StatusInternalServerError, err) + return + } + + stats, err := copier.Stat(mountPoint, "", opts, []string{filepath.Join(mountPoint, path)}) + if err != nil { + utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "failed to get stats about file")) + return + } + if len(stats) <= 0 || len(stats[0].Globbed) <= 0 { + errs := make([]string, 0, len(stats)) + for _, stat := range stats { + if stat.Error != "" { + errs = append(errs, stat.Error) + } + } + utils.Error(w, "Not found.", http.StatusNotFound, fmt.Errorf("file doesn't exist (errs: %q)", strings.Join(errs, ";"))) + return + } + + statHeader, err := statsToHeader(stats[0].Results[stats[0].Globbed[0]]) + if err != nil { + utils.Error(w, "Something went wrong.", http.StatusInternalServerError, err) + return + } + + w.Header().Add("X-Docker-Container-Path-Stat", statHeader) + + if r.Method == http.MethodGet { + idMappingOpts, err := ctr.IDMappings() + if err != nil { + utils.Error(w, "Not found.", http.StatusInternalServerError, + errors.Wrapf(err, "error getting IDMappingOptions")) + return + } + destOwner := idtools.IDPair{UID: os.Getuid(), GID: os.Getgid()} + + opts := copier.GetOptions{ + UIDMap: idMappingOpts.UIDMap, + GIDMap: idMappingOpts.GIDMap, + ChownDirs: &destOwner, + ChownFiles: &destOwner, + KeepDirectoryNames: true, + } + + w.WriteHeader(http.StatusOK) + err = copier.Get(mountPoint, "", opts, []string{filepath.Join(mountPoint, path)}, w) + if err != nil { + logrus.Error(errors.Wrapf(err, "failed to copy from the %s container path %s", containerName, query.Path)) + return + } + } else { + w.WriteHeader(http.StatusOK) + } + +} + +func handlePut(w http.ResponseWriter, r *http.Request, decoder *schema.Decoder, runtime *libpod.Runtime) { + query := struct { + Path string `schema:"path"` + // TODO handle params below + NoOverwriteDirNonDir bool `schema:"noOverwriteDirNonDir"` + CopyUIDGID bool `schema:"copyUIDGID"` + }{} + + err := decoder.Decode(&query, r.URL.Query()) + if err != nil { + utils.Error(w, "Bad Request.", http.StatusBadRequest, errors.Wrap(err, "couldn't decode the query")) + return + } + + ctrName := utils.GetName(r) + + ctr, err := runtime.LookupContainer(ctrName) + if err != nil { + utils.Error(w, "Not found", http.StatusNotFound, errors.Wrapf(err, "the %s container doesn't exists", ctrName)) + return + } + mountPoint, err := ctr.Mount() + if err != nil { + utils.Error(w, "Something went wrong", http.StatusInternalServerError, errors.Wrapf(err, "failed to mount the %s container", ctrName)) + return + } + defer func() { + if err := ctr.Unmount(true); err != nil { + logrus.Warnf("failed to unmount container %s", ctrName) + } + }() + + user, err := getUser(mountPoint, ctr.User()) + if err != nil { + utils.Error(w, "Something went wrong", http.StatusInternalServerError, err) + return + } + idMappingOpts, err := ctr.IDMappings() + if err != nil { + utils.Error(w, "Something went wrong", http.StatusInternalServerError, errors.Wrapf(err, "error getting IDMappingOptions")) + return + } + destOwner := idtools.IDPair{UID: int(user.UID), GID: int(user.GID)} + + opts := copier.PutOptions{ + UIDMap: idMappingOpts.UIDMap, + GIDMap: idMappingOpts.GIDMap, + ChownDirs: &destOwner, + ChownFiles: &destOwner, + } + + mountPoint, path, err := fixUpMountPointAndPath(runtime, ctr, mountPoint, query.Path) + if err != nil { + utils.Error(w, "Something went wrong", http.StatusInternalServerError, err) + return + } + + w.WriteHeader(http.StatusOK) + err = copier.Put(mountPoint, filepath.Join(mountPoint, path), opts, r.Body) + if err != nil { + logrus.Error(errors.Wrapf(err, "failed to copy to the %s container path %s", ctrName, query.Path)) + return + } +} + +func statsToHeader(stats *copier.StatForItem) (string, error) { + statsDTO := struct { + Name string `json:"name"` + Size int64 `json:"size"` + Mode os.FileMode `json:"mode"` + ModTime time.Time `json:"mtime"` + LinkTarget string `json:"linkTarget"` + }{ + Name: filepath.Base(stats.Name), + Size: stats.Size, + Mode: stats.Mode, + ModTime: stats.ModTime, + LinkTarget: stats.ImmediateTarget, + } + + jsonBytes, err := json.Marshal(&statsDTO) + if err != nil { + return "", errors.Wrap(err, "failed to serialize file stats") + } + + buff := bytes.NewBuffer(make([]byte, 0, 128)) + base64encoder := base64.NewEncoder(base64.StdEncoding, buff) + _, err = base64encoder.Write(jsonBytes) + if err != nil { + return "", err + } + err = base64encoder.Close() + if err != nil { + return "", err + } + + return buff.String(), nil +} + +func getUser(mountPoint string, userspec string) (specs.User, error) { + uid, gid, _, err := chrootuser.GetUser(mountPoint, userspec) + u := specs.User{ + UID: uid, + GID: gid, + Username: userspec, + } + if !strings.Contains(userspec, ":") { + groups, err2 := chrootuser.GetAdditionalGroupsForUser(mountPoint, uint64(u.UID)) + if err2 != nil { + if errors.Cause(err2) != chrootuser.ErrNoSuchUser && err == nil { + err = err2 + } + } else { + u.AdditionalGids = groups + } + + } + return u, err +} + +func fixUpMountPointAndPath(runtime *libpod.Runtime, ctr *libpod.Container, mountPoint, ctrPath string) (string, string, error) { + if !filepath.IsAbs(ctrPath) { + endsWithSep := strings.HasSuffix(ctrPath, string(filepath.Separator)) + ctrPath = filepath.Join(ctr.WorkingDir(), ctrPath) + if endsWithSep { + ctrPath = ctrPath + string(filepath.Separator) + } + } + if isVol, volDestName, volName := isVolumeDestName(ctrPath, ctr); isVol { //nolint(gocritic) + newMountPoint, path, err := pathWithVolumeMount(runtime, volDestName, volName, ctrPath) + if err != nil { + return "", "", errors.Wrapf(err, "error getting source path from volume %s", volDestName) + } + mountPoint = newMountPoint + ctrPath = path + } else if isBindMount, mount := isBindMountDestName(ctrPath, ctr); isBindMount { //nolint(gocritic) + newMountPoint, path, err := pathWithBindMountSource(mount, ctrPath) + if err != nil { + return "", "", errors.Wrapf(err, "error getting source path from bind mount %s", mount.Destination) + } + mountPoint = newMountPoint + ctrPath = path + } + return mountPoint, ctrPath, nil +} + +func isVolumeDestName(path string, ctr *libpod.Container) (bool, string, string) { + separator := string(os.PathSeparator) + if filepath.IsAbs(path) { + path = strings.TrimPrefix(path, separator) + } + if path == "" { + return false, "", "" + } + for _, vol := range ctr.Config().NamedVolumes { + volNamePath := strings.TrimPrefix(vol.Dest, separator) + if matchVolumePath(path, volNamePath) { + return true, vol.Dest, vol.Name + } + } + return false, "", "" +} + +func pathWithVolumeMount(runtime *libpod.Runtime, volDestName, volName, path string) (string, string, error) { + destVolume, err := runtime.GetVolume(volName) + if err != nil { + return "", "", errors.Wrapf(err, "error getting volume destination %s", volName) + } + if !filepath.IsAbs(path) { + path = filepath.Join(string(os.PathSeparator), path) + } + return destVolume.MountPoint(), strings.TrimPrefix(path, volDestName), err +} + +func isBindMountDestName(path string, ctr *libpod.Container) (bool, specs.Mount) { + separator := string(os.PathSeparator) + if filepath.IsAbs(path) { + path = strings.TrimPrefix(path, string(os.PathSeparator)) + } + if path == "" { + return false, specs.Mount{} + } + for _, m := range ctr.Config().Spec.Mounts { + if m.Type != "bind" { + continue + } + mDest := strings.TrimPrefix(m.Destination, separator) + if matchVolumePath(path, mDest) { + return true, m + } + } + return false, specs.Mount{} +} + +func matchVolumePath(path, target string) bool { + pathStr := filepath.Clean(path) + target = filepath.Clean(target) + for len(pathStr) > len(target) && strings.Contains(pathStr, string(os.PathSeparator)) { + pathStr = pathStr[:strings.LastIndex(pathStr, string(os.PathSeparator))] + } + return pathStr == target +} + +func pathWithBindMountSource(m specs.Mount, path string) (string, string, error) { + if !filepath.IsAbs(path) { + path = filepath.Join(string(os.PathSeparator), path) + } + return m.Source, strings.TrimPrefix(path, m.Destination), nil } |