podman: add support for --rootfs

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

4 files changed, 25 insertions, 9 deletions

diff --git a/pkg/specgen/generate/config_linux_cgo.go b/pkg/specgen/generate/config_linux_cgo.go
index b06ef5c9a..5d629a6e6 100644
--- a/pkg/specgen/generate/config_linux_cgo.go
+++ b/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
diff --git a/pkg/specgen/generate/container.go b/pkg/specgen/generate/container.go
index de3239fda..9797ad572 100644
--- a/pkg/specgen/generate/container.go
+++ b/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
diff --git a/pkg/specgen/generate/container_create.go b/pkg/specgen/generate/container_create.go
index 369c64e1f..49a717c5d 100644
--- a/pkg/specgen/generate/container_create.go
+++ b/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")
 	}
diff --git a/pkg/specgen/specgen.go b/pkg/specgen/specgen.go
index 37f2b3190..275af1f49 100644
--- a/pkg/specgen/specgen.go
+++ b/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,
 	}