package main import ( "io/ioutil" "os" "path/filepath" "strconv" "strings" "github.com/containers/buildah/pkg/chrootuser" "github.com/containers/buildah/util" "github.com/containers/libpod/cmd/podman/cliconfig" "github.com/containers/libpod/cmd/podman/libpodruntime" "github.com/containers/libpod/libpod" "github.com/containers/libpod/pkg/rootless" "github.com/containers/storage" "github.com/containers/storage/pkg/archive" "github.com/containers/storage/pkg/chrootarchive" "github.com/containers/storage/pkg/idtools" digest "github.com/opencontainers/go-digest" specs "github.com/opencontainers/runtime-spec/specs-go" "github.com/pkg/errors" "github.com/sirupsen/logrus" "github.com/spf13/cobra" ) var ( cpCommand cliconfig.CpValues cpDescription = `Command copies the contents of SRC_PATH to the DEST_PATH. You can copy from the container's file system to the local machine or the reverse, from the local filesystem to the container. If "-" is specified for either the SRC_PATH or DEST_PATH, you can also stream a tar archive from STDIN or to STDOUT. The CONTAINER can be a running or stopped container. The SRC_PATH or DEST_PATH can be a file or directory. ` _cpCommand = &cobra.Command{ Use: "cp [flags] SRC_PATH DEST_PATH", Short: "Copy files/folders between a container and the local filesystem", Long: cpDescription, RunE: func(cmd *cobra.Command, args []string) error { cpCommand.InputArgs = args cpCommand.GlobalFlags = MainGlobalOpts return cpCmd(&cpCommand) }, Example: "[CONTAINER:]SRC_PATH [CONTAINER:]DEST_PATH", } ) func init() { cpCommand.Command = _cpCommand flags := cpCommand.Flags() flags.BoolVar(&cpCommand.Extract, "extract", false, "Extract the tar file into the destination directory.") cpCommand.SetHelpTemplate(HelpTemplate()) cpCommand.SetUsageTemplate(UsageTemplate()) rootCmd.AddCommand(cpCommand.Command) } func cpCmd(c *cliconfig.CpValues) error { args := c.InputArgs if len(args) != 2 { return errors.Errorf("you must provide a source path and a destination path") } runtime, err := libpodruntime.GetRuntime(&c.PodmanCommand) if err != nil { return errors.Wrapf(err, "could not get runtime") } defer runtime.Shutdown(false) extract := c.Flag("extract").Changed return copyBetweenHostAndContainer(runtime, args[0], args[1], extract) } func copyBetweenHostAndContainer(runtime *libpod.Runtime, src string, dest string, extract bool) error { srcCtr, srcPath := parsePath(runtime, src) destCtr, destPath := parsePath(runtime, dest) if (srcCtr == nil && destCtr == nil) || (srcCtr != nil && destCtr != nil) { return errors.Errorf("invalid arguments %s, %s you must use just one container", src, dest) } if len(srcPath) == 0 || len(destPath) == 0 { return errors.Errorf("invalid arguments %s, %s you must specify paths", src, dest) } ctr := srcCtr isFromHostToCtr := (ctr == nil) if isFromHostToCtr { ctr = destCtr } if os.Geteuid() != 0 { s, err := ctr.State() if err != nil { return err } var became bool var ret int if s == libpod.ContainerStateRunning || s == libpod.ContainerStatePaused { data, err := ioutil.ReadFile(ctr.Config().ConmonPidFile) if err != nil { return errors.Wrapf(err, "cannot read conmon PID file %q", ctr.Config().ConmonPidFile) } conmonPid, err := strconv.Atoi(string(data)) if err != nil { return errors.Wrapf(err, "cannot parse PID %q", data) } became, ret, err = rootless.JoinDirectUserAndMountNS(uint(conmonPid)) } else { became, ret, err = rootless.BecomeRootInUserNS() } if err != nil { return err } if became { os.Exit(ret) } } mountPoint, err := ctr.Mount() if err != nil { return err } defer ctr.Unmount(false) user, err := getUser(mountPoint, ctr.User()) if err != nil { return err } idMappingOpts, err := ctr.IDMappings() if err != nil { return errors.Wrapf(err, "error getting IDMappingOptions") } containerOwner := idtools.IDPair{UID: int(user.UID), GID: int(user.GID)} hostUID, hostGID, err := util.GetHostIDs(convertIDMap(idMappingOpts.UIDMap), convertIDMap(idMappingOpts.GIDMap), user.UID, user.GID) if err != nil { return err } hostOwner := idtools.IDPair{UID: int(hostUID), GID: int(hostGID)} var glob []string if isFromHostToCtr { if filepath.IsAbs(destPath) { destPath = filepath.Join(mountPoint, destPath) } else { if err = idtools.MkdirAllAndChownNew(filepath.Join(mountPoint, ctr.WorkingDir()), 0755, hostOwner); err != nil { return errors.Wrapf(err, "error creating directory %q", destPath) } destPath = filepath.Join(mountPoint, ctr.WorkingDir(), destPath) } } else { if filepath.IsAbs(srcPath) { srcPath = filepath.Join(mountPoint, srcPath) } else { srcPath = filepath.Join(mountPoint, ctr.WorkingDir(), srcPath) } } glob, err = filepath.Glob(srcPath) if err != nil { return errors.Wrapf(err, "invalid glob %q", srcPath) } if len(glob) == 0 { glob = append(glob, srcPath) } if !filepath.IsAbs(destPath) { dir, err := os.Getwd() if err != nil { return errors.Wrapf(err, "err getting current working directory") } destPath = filepath.Join(dir, destPath) } var lastError error for _, src := range glob { err := copy(src, destPath, dest, idMappingOpts, &containerOwner, extract) if lastError != nil { logrus.Error(lastError) } lastError = err } return lastError } 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 parsePath(runtime *libpod.Runtime, path string) (*libpod.Container, string) { pathArr := strings.SplitN(path, ":", 2) if len(pathArr) == 2 { ctr, err := runtime.LookupContainer(pathArr[0]) if err == nil { return ctr, pathArr[1] } } return nil, path } func getPathInfo(path string) (string, os.FileInfo, error) { path, err := filepath.EvalSymlinks(path) if err != nil { return "", nil, errors.Wrapf(err, "error evaluating symlinks %q", path) } srcfi, err := os.Stat(path) if err != nil { return "", nil, errors.Wrapf(err, "error reading path %q", path) } return path, srcfi, nil } func copy(src, destPath, dest string, idMappingOpts storage.IDMappingOptions, chownOpts *idtools.IDPair, extract bool) error { srcPath, err := filepath.EvalSymlinks(src) if err != nil { return errors.Wrapf(err, "error evaluating symlinks %q", srcPath) } srcPath, srcfi, err := getPathInfo(srcPath) if err != nil { return err } destdir := destPath if !srcfi.IsDir() && !strings.HasSuffix(dest, string(os.PathSeparator)) { destdir = filepath.Dir(destPath) } if err = os.MkdirAll(destdir, 0755); err != nil { return errors.Wrapf(err, "error creating directory %q", destdir) } // return functions for copying items copyFileWithTar := chrootarchive.CopyFileWithTarAndChown(chownOpts, digest.Canonical.Digester().Hash(), idMappingOpts.UIDMap, idMappingOpts.GIDMap) copyWithTar := chrootarchive.CopyWithTarAndChown(chownOpts, digest.Canonical.Digester().Hash(), idMappingOpts.UIDMap, idMappingOpts.GIDMap) untarPath := chrootarchive.UntarPathAndChown(chownOpts, digest.Canonical.Digester().Hash(), idMappingOpts.UIDMap, idMappingOpts.GIDMap) if srcfi.IsDir() { logrus.Debugf("copying %q to %q", srcPath+string(os.PathSeparator)+"*", dest+string(os.PathSeparator)+"*") if err = copyWithTar(srcPath, destPath); err != nil { return errors.Wrapf(err, "error copying %q to %q", srcPath, dest) } return nil } if !archive.IsArchivePath(srcPath) { // This srcPath is a file, and either it's not an // archive, or we don't care whether or not it's an // archive. destfi, err := os.Stat(destPath) if err != nil { if !os.IsNotExist(err) { return errors.Wrapf(err, "failed to get stat of dest path %s", destPath) } } if destfi != nil && destfi.IsDir() { destPath = filepath.Join(destPath, filepath.Base(srcPath)) } } if extract { // We're extracting an archive into the destination directory. logrus.Debugf("extracting contents of %q into %q", srcPath, destPath) if err = untarPath(srcPath, destPath); err != nil { return errors.Wrapf(err, "error extracting %q into %q", srcPath, destPath) } return nil } // Copy the file, preserving attributes. logrus.Debugf("copying %q to %q", srcPath, destPath) if err = copyFileWithTar(srcPath, destPath); err != nil { return errors.Wrapf(err, "error copying %q to %q", srcPath, destPath) } return nil } func convertIDMap(idMaps []idtools.IDMap) (convertedIDMap []specs.LinuxIDMapping) { for _, idmap := range idMaps { tempIDMap := specs.LinuxIDMapping{ ContainerID: uint32(idmap.ContainerID), HostID: uint32(idmap.HostID), Size: uint32(idmap.Size), } convertedIDMap = append(convertedIDMap, tempIDMap) } return convertedIDMap }