'podman cp' copy between host and container

Signed-off-by: Qi Wang <qiwan@redhat.com>

1 files changed, 257 insertions, 0 deletions

diff --git a/cmd/podman/cp.go b/cmd/podman/cp.go
new file mode 100644
index 000000000..89114fda1
--- /dev/null
+++ b/cmd/podman/cp.go
@@ -0,0 +1,257 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+
+	"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/chrootuser"
+	"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 = "Copy files/folders between a container and the local filesystem"
+	_cpCommand    = &cobra.Command{
+		Use:   "cp",
+		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
+	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)
+
+	return copyBetweenHostAndContainer(runtime, args[0], args[1])
+}
+
+func copyBetweenHostAndContainer(runtime *libpod.Runtime, src string, dest string) 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
+	}
+
+	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)
+		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) 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))
+		}
+		// 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
+	}
+	// 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
+}
+
+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
+}