Add config validation

image/config.go

@@ -53,10 +53,6 @@ func findConfig(w walker, d *descriptor) (*config, error) {
 		if err := json.Unmarshal(buf, &c); err != nil {
 			return err
 		}
-		// check if the rootfs type is 'layers'
-		if c.RootFS.Type != "layers" {
-			return fmt.Errorf("%q is an unknown rootfs type, MUST be 'layers'", c.RootFS.Type)
-		}
 		return errEOW
 	}); err {
 	case nil:
@@ -68,6 +64,44 @@ func findConfig(w walker, d *descriptor) (*config, error) {
 	}
 }
 
+func (c *config) validate() error {
+
+	// check if the rootfs type is 'layers'
+	if c.RootFS.Type != "layers" {
+		return fmt.Errorf("%q is an unknown rootfs type, MUST be 'layers'", c.RootFS.Type)
+	}
+
+	//check os and architecture
+	if err := c.checkPlatform(); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (c *config) checkPlatform() error {
+	validCombins := map[string][]string{
+		"darwin":    {"386", "amd64", "arm", "arm64"},
+		"dragonfly": {"amd64"},
+		"freebsd":   {"386", "amd64", "arm"},
+		"linux":     {"386", "amd64", "arm", "arm64", "ppc64", "ppc64le", "mips64", "mips64le"},
+		"netbsd":    {"386", "amd64", "arm"},
+		"openbsd":   {"386", "amd64", "arm"},
+		"plan9":     {"386", "amd64"},
+		"solaris":   {"amd64"},
+		"windows":   {"386", "amd64"}}
+	for os, archs := range validCombins {
+		if os == c.OS {
+			for _, arch := range archs {
+				if arch == c.Architecture {
+					return nil
+				}
+			}
+			return fmt.Errorf("Combination of %q and %q is invalid.", c.OS, c.Architecture)
+		}
+	}
+	return fmt.Errorf("Operation system %q of the bundle is not supported yet.", c.OS)
+}
+
 func (c *config) runtimeSpec(rootfs string) (*specs.Spec, error) {
 	if c.OS != "linux" {
 		return nil, fmt.Errorf("%s: unsupported OS", c.OS)

image/image.go

@@ -84,9 +84,19 @@ func validate(w walker, refs []string, out *log.Logger) error {
 			return err
 		}
 
-		if err := m.validate(w); err != nil {
+		if err = m.validate(w); err != nil {
 			return err
 		}
+
+		c, err := findConfig(w, &m.Config)
+		if err != nil {
+			return err
+		}
+
+		if err = c.validate(); err != nil {
+			return err
+		}
+
 		if out != nil {
 			out.Printf("reference %q: OK", ref)
 		}
@@ -180,6 +190,10 @@ func createRuntimeBundle(w walker, dest, refName, rootfs string) error {
 		return err
 	}
 
+	if err = c.validate(); err != nil {
+		return err
+	}
+
 	err = m.unpack(w, filepath.Join(dest, rootfs))
 	if err != nil {
 		return err