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package abi
import (
"context"
"io"
"path/filepath"
"strings"
buildahCopiah "github.com/containers/buildah/copier"
"github.com/containers/buildah/pkg/chrootuser"
"github.com/containers/buildah/util"
"github.com/containers/podman/v2/libpod"
"github.com/containers/podman/v2/pkg/domain/entities"
"github.com/containers/storage"
"github.com/containers/storage/pkg/archive"
"github.com/containers/storage/pkg/idtools"
"github.com/opencontainers/runtime-spec/specs-go"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// NOTE: Only the parent directory of the container path must exist. The path
// itself may be created while copying.
func (ic *ContainerEngine) ContainerCopyFromArchive(ctx context.Context, nameOrID string, containerPath string, reader io.Reader) (entities.ContainerCopyFunc, error) {
container, err := ic.Libpod.LookupContainer(nameOrID)
if err != nil {
return nil, err
}
containerMountPoint, err := container.Mount()
if err != nil {
return nil, err
}
unmount := func() {
if err := container.Unmount(false); err != nil {
logrus.Errorf("Error unmounting container: %v", err)
}
}
_, resolvedRoot, resolvedContainerPath, err := ic.containerStat(container, containerMountPoint, containerPath)
if err != nil {
unmount()
return nil, err
}
decompressed, err := archive.DecompressStream(reader)
if err != nil {
unmount()
return nil, err
}
idMappings, idPair, err := getIDMappingsAndPair(container, resolvedRoot)
if err != nil {
unmount()
return nil, err
}
logrus.Debugf("Container copy *to* %q (resolved: %q) on container %q (ID: %s)", containerPath, resolvedContainerPath, container.Name(), container.ID())
return func() error {
defer unmount()
defer decompressed.Close()
putOptions := buildahCopiah.PutOptions{
UIDMap: idMappings.UIDMap,
GIDMap: idMappings.GIDMap,
ChownDirs: idPair,
ChownFiles: idPair,
}
return buildahCopiah.Put(resolvedRoot, resolvedContainerPath, putOptions, decompressed)
}, nil
}
func (ic *ContainerEngine) ContainerCopyToArchive(ctx context.Context, nameOrID string, containerPath string, writer io.Writer) (entities.ContainerCopyFunc, error) {
container, err := ic.Libpod.LookupContainer(nameOrID)
if err != nil {
return nil, err
}
containerMountPoint, err := container.Mount()
if err != nil {
return nil, err
}
unmount := func() {
if err := container.Unmount(false); err != nil {
logrus.Errorf("Error unmounting container: %v", err)
}
}
// Make sure that "/" copies the *contents* of the mount point and not
// the directory.
if containerPath == "/" {
containerPath = "/."
}
statInfo, resolvedRoot, resolvedContainerPath, err := ic.containerStat(container, containerMountPoint, containerPath)
if err != nil {
unmount()
return nil, err
}
idMappings, idPair, err := getIDMappingsAndPair(container, resolvedRoot)
if err != nil {
unmount()
return nil, err
}
logrus.Debugf("Container copy *from* %q (resolved: %q) on container %q (ID: %s)", containerPath, resolvedContainerPath, container.Name(), container.ID())
return func() error {
defer container.Unmount(false)
getOptions := buildahCopiah.GetOptions{
// Unless the specified points to ".", we want to copy the base directory.
KeepDirectoryNames: statInfo.IsDir && filepath.Base(containerPath) != ".",
UIDMap: idMappings.UIDMap,
GIDMap: idMappings.GIDMap,
ChownDirs: idPair,
ChownFiles: idPair,
}
return buildahCopiah.Get(resolvedRoot, "", getOptions, []string{resolvedContainerPath}, writer)
}, nil
}
// getIDMappingsAndPair returns the ID mappings for the container and the host
// ID pair.
func getIDMappingsAndPair(container *libpod.Container, containerMount string) (*storage.IDMappingOptions, *idtools.IDPair, error) {
user, err := getContainerUser(container, containerMount)
if err != nil {
return nil, nil, err
}
idMappingOpts, err := container.IDMappings()
if err != nil {
return nil, nil, err
}
hostUID, hostGID, err := util.GetHostIDs(idtoolsToRuntimeSpec(idMappingOpts.UIDMap), idtoolsToRuntimeSpec(idMappingOpts.GIDMap), user.UID, user.GID)
if err != nil {
return nil, nil, err
}
idPair := idtools.IDPair{UID: int(hostUID), GID: int(hostGID)}
return &idMappingOpts, &idPair, nil
}
// getContainerUser returns the specs.User of the container.
func getContainerUser(container *libpod.Container, mountPoint string) (specs.User, error) {
userspec := container.Config().User
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
}
// idtoolsToRuntimeSpec converts idtools ID mapping to the one of the runtime spec.
func idtoolsToRuntimeSpec(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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