package specgen import ( "path/filepath" "strings" "github.com/containers/common/pkg/parse" spec "github.com/opencontainers/runtime-spec/specs-go" "github.com/pkg/errors" "github.com/sirupsen/logrus" ) // NamedVolume holds information about a named volume that will be mounted into // the container. type NamedVolume struct { // Name is the name of the named volume to be mounted. May be empty. // If empty, a new named volume with a pseudorandomly generated name // will be mounted at the given destination. Name string // Destination to mount the named volume within the container. Must be // an absolute path. Path will be created if it does not exist. Dest string // Options are options that the named volume will be mounted with. Options []string } // OverlayVolume holds information about a overlay volume that will be mounted into // the container. type OverlayVolume struct { // Destination is the absolute path where the mount will be placed in the container. Destination string `json:"destination"` // Source specifies the source path of the mount. Source string `json:"source,omitempty"` // Options holds overlay volume options. Options []string `json:"options,omitempty"` } // ImageVolume is a volume based on a container image. The container image is // first mounted on the host and is then bind-mounted into the container. An // ImageVolume is always mounted read only. type ImageVolume struct { // Source is the source of the image volume. The image can be referred // to by name and by ID. Source string // Destination is the absolute path of the mount in the container. Destination string // ReadWrite sets the volume writable. ReadWrite bool } // GenVolumeMounts parses user input into mounts, volumes and overlay volumes func GenVolumeMounts(volumeFlag []string) (map[string]spec.Mount, map[string]*NamedVolume, map[string]*OverlayVolume, error) { errDuplicateDest := errors.Errorf("duplicate mount destination") mounts := make(map[string]spec.Mount) volumes := make(map[string]*NamedVolume) overlayVolumes := make(map[string]*OverlayVolume) volumeFormatErr := errors.Errorf("incorrect volume format, should be [host-dir:]ctr-dir[:option]") for _, vol := range volumeFlag { var ( options []string src string dest string err error ) splitVol := strings.Split(vol, ":") if len(splitVol) > 3 { return nil, nil, nil, errors.Wrapf(volumeFormatErr, vol) } src = splitVol[0] if len(splitVol) == 1 { // This is an anonymous named volume. Only thing given // is destination. // Name/source will be blank, and populated by libpod. src = "" dest = splitVol[0] } else if len(splitVol) > 1 { dest = splitVol[1] } if len(splitVol) > 2 { if options, err = parse.ValidateVolumeOpts(strings.Split(splitVol[2], ",")); err != nil { return nil, nil, nil, err } } // Do not check source dir for anonymous volumes if len(splitVol) > 1 { if len(src) == 0 { return nil, nil, nil, errors.New("host directory cannot be empty") } } if err := parse.ValidateVolumeCtrDir(dest); err != nil { return nil, nil, nil, err } cleanDest := filepath.Clean(dest) if strings.HasPrefix(src, "/") || strings.HasPrefix(src, ".") { // This is not a named volume overlayFlag := false chownFlag := false for _, o := range options { if o == "O" { overlayFlag = true joinedOpts := strings.Join(options, "") if strings.Contains(joinedOpts, "U") { chownFlag = true } if len(options) > 2 || (len(options) == 2 && !chownFlag) { return nil, nil, nil, errors.New("can't use 'O' with other options") } } } if overlayFlag { // This is a overlay volume newOverlayVol := new(OverlayVolume) newOverlayVol.Destination = cleanDest newOverlayVol.Source = src newOverlayVol.Options = options if _, ok := overlayVolumes[newOverlayVol.Destination]; ok { return nil, nil, nil, errors.Wrapf(errDuplicateDest, newOverlayVol.Destination) } overlayVolumes[newOverlayVol.Destination] = newOverlayVol } else { newMount := spec.Mount{ Destination: cleanDest, Type: "bind", Source: src, Options: options, } if _, ok := mounts[newMount.Destination]; ok { return nil, nil, nil, errors.Wrapf(errDuplicateDest, newMount.Destination) } mounts[newMount.Destination] = newMount } } else { // This is a named volume newNamedVol := new(NamedVolume) newNamedVol.Name = src newNamedVol.Dest = cleanDest newNamedVol.Options = options if _, ok := volumes[newNamedVol.Dest]; ok { return nil, nil, nil, errors.Wrapf(errDuplicateDest, newNamedVol.Dest) } volumes[newNamedVol.Dest] = newNamedVol } logrus.Debugf("User mount %s:%s options %v", src, dest, options) } return mounts, volumes, overlayVolumes, nil }