add config validate

Signed-off-by: zhouhao <zhouhao@cn.fujitsu.com>

Author: zhouhao

image/config.go

@@ -53,6 +53,15 @@ 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)
+		}
+
+		//check os and architecture
+		if err := checkPlatform(c); err != nil {
+			return err
+		}
 		return errEOW
 	}); err {
 	case nil:
@@ -64,19 +73,28 @@ func findConfig(w walker, d *descriptor) (*config, error) {
 	}
 }
 
-func (c *config) validate(w walk) error {
-
-	// check if the rootfs type is 'layers'
-	if c.RootFS.Type != "layers" {
-		return errors.New("%q is an unknown rootfs type, MUST be 'layers'", c.RootFS.Type)
+func checkPlatform(c config) 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)
+		}
 	}
-
-	for _, d = range c.RootFs.DiffIDs {
-		h := sha256.New()
-		DiffIds := "sha256" + hex.EncodeToString(h.Sum(nil))
-
-		if DiffIds != d {
-			return errors.New("DiffIDs mismatch")
+	return fmt.Errorf("Operation system %q of the bundle is not supported yet.", c.OS)
 }
 
 func (c *config) runtimeSpec(rootfs string) (*specs.Spec, error) {

image/image.go

@@ -88,12 +88,7 @@ func validate(w walker, refs []string, out *log.Logger) error {
 			return err
 		}
 
-		c, err := findConfig(w, &m.Config)
-		if err != nil {
-			return err
-		}
-
-		if err := c.validate(w); err != nil {
+		if _, err := findConfig(w, &m.Config); err != nil {
 			return err
 		}