Provide plug-in point for alternative version schemes (#15)

* Provide plug-in point for alternative version schemes

README.md

@@ -134,21 +134,19 @@ cd $GOPATH && \
 git clone git@github.com:getnelson/slipway.git github.com/getnelson/slipway
 ```
 
-Next, install the tools `slipway` needs to build:
+Next, install the tools `slipway` needs to build and generate the protobuf (as a one-time operation)
 
 ```
 make tools
 make deps.install
+make generate
 ```
 
-Generate the protobuf (as a one-time operation) and then build:
+Finally, execute the build and test:
 
 ```
-make generate && \
 make build && \
 make test
 ```
 
 The slipway binary will then be available in `./bin/slipway`
-
-

cmd/util.go

@@ -110,18 +110,18 @@ func getUnitNameFromDockerContainer(ctr string) (a string, b string) {
  * Given a docker tag like 1.23.45 create a typed protobuf nelson.Version
  * representation which can be used with v2 APIs
  */
-func versionFromTag(tagged string) (v *nelson.Version, errs []error) {
+func versionFromTag(tagged string) (v *nelson.SemanticVersion, errs []error) {
 	arr := strings.Split(tagged, ".")
 	if len(arr) > 3 {
 		errs = append(errs, errors.New("The supplied version string '"+tagged+"' should follow semver, and be composed of three components. E.g. 1.20.49"))
-		return &nelson.Version{}, errs
+		return &nelson.SemanticVersion{}, errs
 	}
 
 	se, _ := strconv.ParseInt(arr[0], 10, 32)
 	fe, _ := strconv.ParseInt(arr[1], 10, 32)
 	pa, _ := strconv.ParseInt(arr[2], 10, 32)
 
-	return &nelson.Version{Series: int32(se), Feature: int32(fe), Patch: int32(pa)}, nil
+	return &nelson.SemanticVersion{Major: int32(se), Minor: int32(fe), Patch: int32(pa)}, nil
 }
 
 /* lift the old three-param behavior into the new v2 typed nelson.Deployable */
@@ -133,7 +133,7 @@ func newProtoDeployable(imageUri string, unitName string, tag string) (*nelson.D
 
 	return &nelson.Deployable{
 		UnitName: unitName,
-		Version:  v,
+		Version:  &nelson.Deployable_Semver{v},
 		Kind: &nelson.Deployable_Container{
 			&nelson.Container{
 				Image: imageUri,

glide.yaml

@@ -19,7 +19,7 @@ import:
 - package: gopkg.in/yaml.v2
   version: a5b47d31c556af34a302ce5d659e6fea44d90de0
 - package: github.com/getnelson/api
-  version: 5bdf591afeae6880f49b2026e1975af5a2050ecb
+  version: b34ae15e3411689955977de715a10d5bd2901de5
   subpackages:
   - protobuf
 - package: github.com/gogo/googleapis