From 4e2d18db903e19c6cb56d75da0f69e42abe64c47 Mon Sep 17 00:00:00 2001
From: Matej Vasek <mvasek@redhat.com>
Date: Wed, 4 Nov 2020 20:18:02 +0100
Subject: Implement containers/{id or name}/archive
Signed-off-by: Matej Vasek <mvasek@redhat.com>
---
pkg/api/handlers/compat/containers_archive.go | 341 +++++++++++++++++++++++++-
1 file changed, 337 insertions(+), 4 deletions(-)
(limited to 'pkg/api')
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
}
--
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