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package container // import "github.com/docker/docker/container"
import (
"os"
"github.com/docker/docker/api/types"
"github.com/docker/docker/pkg/archive"
"github.com/docker/docker/pkg/system"
"github.com/pkg/errors"
)
// ResolvePath resolves the given path in the container to a resource on the
// host. Returns a resolved path (absolute path to the resource on the host),
// the absolute path to the resource relative to the container's rootfs, and
// an error if the path points to outside the container's rootfs.
func (container *Container) ResolvePath(path string) (resolvedPath, absPath string, err error) {
if container.BaseFS == nil {
return "", "", errors.New("ResolvePath: BaseFS of container " + container.ID + " is unexpectedly nil")
}
// Check if a drive letter supplied, it must be the system drive. No-op except on Windows
path, err = system.CheckSystemDriveAndRemoveDriveLetter(path, container.BaseFS)
if err != nil {
return "", "", err
}
// Consider the given path as an absolute path in the container.
absPath = archive.PreserveTrailingDotOrSeparator(
container.BaseFS.Join(string(container.BaseFS.Separator()), path),
path,
container.BaseFS.Separator())
// Split the absPath into its Directory and Base components. We will
// resolve the dir in the scope of the container then append the base.
dirPath, basePath := container.BaseFS.Split(absPath)
resolvedDirPath, err := container.GetResourcePath(dirPath)
if err != nil {
return "", "", err
}
// resolvedDirPath will have been cleaned (no trailing path separators) so
// we can manually join it with the base path element.
resolvedPath = resolvedDirPath + string(container.BaseFS.Separator()) + basePath
return resolvedPath, absPath, nil
}
// StatPath is the unexported version of StatPath. Locks and mounts should
// be acquired before calling this method and the given path should be fully
// resolved to a path on the host corresponding to the given absolute path
// inside the container.
func (container *Container) StatPath(resolvedPath, absPath string) (stat *types.ContainerPathStat, err error) {
if container.BaseFS == nil {
return nil, errors.New("StatPath: BaseFS of container " + container.ID + " is unexpectedly nil")
}
driver := container.BaseFS
lstat, err := driver.Lstat(resolvedPath)
if err != nil {
return nil, err
}
var linkTarget string
if lstat.Mode()&os.ModeSymlink != 0 {
// Fully evaluate the symlink in the scope of the container rootfs.
hostPath, err := container.GetResourcePath(absPath)
if err != nil {
return nil, err
}
linkTarget, err = driver.Rel(driver.Path(), hostPath)
if err != nil {
return nil, err
}
// Make it an absolute path.
linkTarget = driver.Join(string(driver.Separator()), linkTarget)
}
return &types.ContainerPathStat{
Name: driver.Base(absPath),
Size: lstat.Size(),
Mode: lstat.Mode(),
Mtime: lstat.ModTime(),
LinkTarget: linkTarget,
}, nil
}
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