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//go:build !windows
package daemon // import "github.com/docker/docker/daemon"
import (
"context"
"io"
"os"
"path/filepath"
containertypes "github.com/docker/docker/api/types/container"
"github.com/docker/docker/api/types/events"
"github.com/docker/docker/container"
"github.com/docker/docker/errdefs"
"github.com/docker/docker/pkg/archive"
"github.com/docker/docker/pkg/ioutils"
volumemounts "github.com/docker/docker/volume/mounts"
"github.com/pkg/errors"
)
// containerStatPath stats the filesystem resource at the specified path in this
// container. Returns stat info about the resource.
func (daemon *Daemon) containerStatPath(container *container.Container, path string) (stat *containertypes.PathStat, err error) {
container.Lock()
defer container.Unlock()
cfs, err := daemon.openContainerFS(container)
if err != nil {
return nil, err
}
defer cfs.Close()
return cfs.Stat(context.TODO(), path)
}
// containerArchivePath creates an archive of the filesystem resource at the specified
// path in this container. Returns a tar archive of the resource and stat info
// about the resource.
func (daemon *Daemon) containerArchivePath(container *container.Container, path string) (content io.ReadCloser, stat *containertypes.PathStat, err error) {
container.Lock()
defer func() {
if err != nil {
// Wait to unlock the container until the archive is fully read
// (see the ReadCloseWrapper func below) or if there is an error
// before that occurs.
container.Unlock()
}
}()
cfs, err := daemon.openContainerFS(container)
if err != nil {
return nil, nil, err
}
defer func() {
if err != nil {
cfs.Close()
}
}()
absPath := archive.PreserveTrailingDotOrSeparator(filepath.Join("/", path), path)
stat, err = cfs.Stat(context.TODO(), absPath)
if err != nil {
return nil, nil, err
}
sourceDir, sourceBase := absPath, "."
if stat.Mode&os.ModeDir == 0 { // not dir
sourceDir, sourceBase = filepath.Split(absPath)
}
opts := archive.TarResourceRebaseOpts(sourceBase, filepath.Base(absPath))
tb, err := archive.NewTarballer(sourceDir, opts)
if err != nil {
return nil, nil, err
}
cfs.GoInFS(context.TODO(), tb.Do)
data := tb.Reader()
content = ioutils.NewReadCloserWrapper(data, func() error {
err := data.Close()
_ = cfs.Close()
container.Unlock()
return err
})
daemon.LogContainerEvent(container, events.ActionArchivePath)
return content, stat, nil
}
// containerExtractToDir extracts the given tar archive to the specified location in the
// filesystem of this container. The given path must be of a directory in the
// container. If it is not, the error will be an errdefs.InvalidParameter. If
// noOverwriteDirNonDir is true then it will be an error if unpacking the
// given content would cause an existing directory to be replaced with a non-
// directory and vice versa.
func (daemon *Daemon) containerExtractToDir(container *container.Container, path string, copyUIDGID, noOverwriteDirNonDir bool, content io.Reader) (err error) {
container.Lock()
defer container.Unlock()
cfs, err := daemon.openContainerFS(container)
if err != nil {
return err
}
defer cfs.Close()
err = cfs.RunInFS(context.TODO(), func() error {
// The destination path needs to be resolved with all symbolic links
// followed. Note that we need to also evaluate the last path element if
// it is a symlink. This is so that you can extract an archive to a
// symlink that points to a directory.
absPath, err := filepath.EvalSymlinks(filepath.Join("/", path))
if err != nil {
return err
}
absPath = archive.PreserveTrailingDotOrSeparator(absPath, path)
stat, err := os.Lstat(absPath)
if err != nil {
return err
}
if !stat.IsDir() {
return errdefs.InvalidParameter(errors.New("extraction point is not a directory"))
}
// Need to check if the path is in a volume. If it is, it cannot be in a
// read-only volume. If it is not in a volume, the container cannot be
// configured with a read-only rootfs.
toVolume, err := checkIfPathIsInAVolume(container, absPath)
if err != nil {
return err
}
if !toVolume && container.HostConfig.ReadonlyRootfs {
return errdefs.InvalidParameter(errors.New("container rootfs is marked read-only"))
}
options := daemon.defaultTarCopyOptions(noOverwriteDirNonDir)
if copyUIDGID {
var err error
// tarCopyOptions will appropriately pull in the right uid/gid for the
// user/group and will set the options.
options, err = daemon.tarCopyOptions(container, noOverwriteDirNonDir)
if err != nil {
return err
}
}
return archive.Untar(content, absPath, options)
})
if err != nil {
return err
}
daemon.LogContainerEvent(container, events.ActionExtractToDir)
return nil
}
// checkIfPathIsInAVolume checks if the path is in a volume. If it is, it
// cannot be in a read-only volume. If it is not in a volume, the container
// cannot be configured with a read-only rootfs.
func checkIfPathIsInAVolume(container *container.Container, absPath string) (bool, error) {
var toVolume bool
parser := volumemounts.NewParser()
for _, mnt := range container.MountPoints {
if toVolume = parser.HasResource(mnt, absPath); toVolume {
if mnt.RW {
break
}
return false, errdefs.InvalidParameter(errors.New("mounted volume is marked read-only"))
}
}
return toVolume, nil
}
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