podman: add support for --rootfs

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

cmd/podman/containers/create.go

@@ -75,8 +75,7 @@ func init() {
 
 func create(cmd *cobra.Command, args []string) error {
 	var (
-		err           error
-		rawImageInput string
+		err error
 	)
 	cliVals.Net, err = common.NetFlagsToNetOptions(cmd)
 	if err != nil {
@@ -92,20 +91,16 @@ func create(cmd *cobra.Command, args []string) error {
 		defer errorhandling.SyncQuiet(cidFile)
 	}
 
-	if rfs := cliVals.RootFS; !rfs {
-		rawImageInput = args[0]
-	}
-
 	if err := createInit(cmd); err != nil {
 		return err
 	}
 
-	if err := pullImage(args[0]); err != nil {
-		return err
+	if !cliVals.RootFS {
+		if err := pullImage(args[0]); err != nil {
+			return err
+		}
 	}
-
-	//TODO rootfs still
-	s := specgen.NewSpecGenerator(rawImageInput)
+	s := specgen.NewSpecGenerator(args[0], cliVals.RootFS)
 	if err := common.FillOutSpecGen(s, &cliVals, args); err != nil {
 		return err
 	}

cmd/podman/containers/run.go

@@ -104,8 +104,10 @@ func run(cmd *cobra.Command, args []string) error {
 		return err
 	}
 
-	if err := pullImage(args[0]); err != nil {
-		return err
+	if !cliVals.RootFS {
+		if err := pullImage(args[0]); err != nil {
+			return err
+		}
 	}
 
 	// If -i is not set, clear stdin
@@ -136,7 +138,7 @@ func run(cmd *cobra.Command, args []string) error {
 	}
 	runOpts.Detach = cliVals.Detach
 	runOpts.DetachKeys = cliVals.DetachKeys
-	s := specgen.NewSpecGenerator(args[0])
+	s := specgen.NewSpecGenerator(args[0], cliVals.RootFS)
 	if err := common.FillOutSpecGen(s, &cliVals, args); err != nil {
 		return err
 	}

pkg/specgen/generate/config_linux_cgo.go

@@ -24,6 +24,9 @@ func getSeccompConfig(s *specgen.SpecGenerator, configSpec *spec.Spec, img *imag
 	}
 
 	if scp == seccomp.PolicyImage {
+		if img == nil {
+			return nil, errors.New("cannot read seccomp profile without a valid image")
+		}
 		labels, err := img.Labels(context.Background())
 		if err != nil {
 			return nil, err

pkg/specgen/generate/container.go

@@ -15,7 +15,11 @@ import (
 func CompleteSpec(ctx context.Context, r *libpod.Runtime, s *specgen.SpecGenerator) error {
 	var appendEntryPoint bool
 
-	// TODO add support for raw rootfs
+	// If a rootfs is used, then there is no image data
+	if s.ContainerStorageConfig.Rootfs != "" {
+		return nil
+	}
+
 	newImage, err := r.ImageRuntime().NewFromLocal(s.Image)
 	if err != nil {
 		return err

pkg/specgen/generate/container_create.go

@@ -7,6 +7,7 @@ import (
 	"github.com/containers/common/pkg/config"
 	"github.com/containers/libpod/libpod"
 	"github.com/containers/libpod/libpod/define"
+	"github.com/containers/libpod/libpod/image"
 	"github.com/containers/libpod/pkg/specgen"
 	"github.com/containers/storage"
 	"github.com/pkg/errors"
@@ -84,13 +85,16 @@ func MakeContainer(rt *libpod.Runtime, s *specgen.SpecGenerator) (*libpod.Contai
 		return nil, err
 	}
 	options = append(options, createExitCommandOption(s, rt.StorageConfig(), rtc, podmanPath))
-	newImage, err := rt.ImageRuntime().NewFromLocal(s.Image)
-	if err != nil {
-		return nil, err
+	var newImage *image.Image
+	if s.Rootfs != "" {
+		options = append(options, libpod.WithRootFS(s.Rootfs))
+	} else {
+		newImage, err = rt.ImageRuntime().NewFromLocal(s.Image)
+		if err != nil {
+			return nil, err
+		}
+		options = append(options, libpod.WithRootFSFromImage(newImage.ID(), s.Image, s.RawImageName))
 	}
-
-	options = append(options, libpod.WithRootFSFromImage(newImage.ID(), s.Image, s.RawImageName))
-
 	if err := s.Validate(); err != nil {
 		return nil, errors.Wrap(err, "invalid config provided")
 	}

pkg/specgen/specgen.go

@@ -402,8 +402,13 @@ type NamedVolume struct {
 }
 
 // NewSpecGenerator returns a SpecGenerator struct given one of two mandatory inputs
-func NewSpecGenerator(image string) *SpecGenerator {
-	csc := ContainerStorageConfig{Image: image}
+func NewSpecGenerator(arg string, rootfs bool) *SpecGenerator {
+	csc := ContainerStorageConfig{}
+	if rootfs {
+		csc.Rootfs = arg
+	} else {
+		csc.Image = arg
+	}
 	return &SpecGenerator{
 		ContainerStorageConfig: csc,
 	}