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'podman cp' copy between host and container
Signed-off-by: Qi Wang <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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 | ||
|
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| 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]) | ||
| } | ||
|
|
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| func copyBetweenHostAndContainer(runtime *libpod.Runtime, src string, dest string) error { | ||
|
|
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| 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 | ||
| } | ||
|
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| 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) | ||
|
|
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| if srcfi.IsDir() { | ||
|
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| 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 | ||
| } |
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