extracting the definition of the no spec project descriptor to a diff…

…erent file

Signed-off-by: Juan Bustamante <jbustamante@vmware.com>

pkg/cnb/project_descriptor.go

@@ -51,9 +51,12 @@ func parseProjectDescriptor(file string, logger *log.Logger) (descriptorV2, erro
 	if _, err := toml.DecodeFile(file, &d); err != nil {
 		var dV2NoSpec descriptorV2NoSpec
 		if _, err2 := toml.DecodeFile(file, &dV2NoSpec); err2 != nil {
+			logger.Println(fmt.Sprintf("warning: project descriptor '%s' could not be parsed, error '%v'", file, err))
 			return descriptorV2{}, err2
 		}
 		d = v2NoSpecToV2(dV2NoSpec)
+		logger.Println(fmt.Sprintf("warning: using key io.buildpacks.env to set environment variables is " +
+			"not defined in the specification. We recommend switching to io.buildpacks.build.env instead"))
 	}
 
 	switch sv := d.Project.SchemaVersion; sv {
@@ -87,23 +90,6 @@ func v1ToV2(v1 descriptorV1) descriptorV2 {
 	}
 }
 
-func v2NoSpecToV2(v2 descriptorV2NoSpec) descriptorV2 {
-	return descriptorV2{
-		Project: v2.Project,
-		IO: ioTable{
-			Buildpacks: cnbTableV2{
-				build: v2.IO.Buildpacks.build,
-				Group: v2.IO.Buildpacks.Group,
-				buildEnvVariableV2: buildEnvVariableV2{
-					BuildEnv: buildEnvVariable{
-						Env: v2.IO.Buildpacks.Env,
-					},
-				},
-			},
-		},
-	}
-}
-
 func processFiles(appDir string, d build) error {
 	fileFilter, err := getFileFilter(d)
 	if err != nil {
@@ -209,18 +195,3 @@ type cnbTableV1 struct {
 	Env        []envVariable `toml:"env"`
 	Buildpacks []buildpack   `toml:"buildpacks"`
 }
-
-type descriptorV2NoSpec struct {
-	Project project       `toml:"_"`
-	IO      ioTableNoSpec `toml:"io"`
-}
-
-type ioTableNoSpec struct {
-	Buildpacks cnbTableV2NoSpec `toml:"buildpacks"`
-}
-
-type cnbTableV2NoSpec struct {
-	build `toml:",inline"`
-	Env   []envVariable `toml:"env"`
-	Group []buildpack   `toml:"group"`
-}

pkg/cnb/project_descriptor_nospec.go

@@ -0,0 +1,36 @@
+package cnb
+
+// A descriptorV2NoSpec represents a project descriptor that uses the key io.buildpacks.env to set environment variables
+// This key is not defined in the Project Descriptor V2, but was added by mistake in the PR https://github.com/pivotal/kpack/pull/810
+// and this struct is created to guarantee compatibility
+type descriptorV2NoSpec struct {
+	Project project       `toml:"_"`
+	IO      ioTableNoSpec `toml:"io"`
+}
+
+type ioTableNoSpec struct {
+	Buildpacks cnbTableV2NoSpec `toml:"buildpacks"`
+}
+
+type cnbTableV2NoSpec struct {
+	build `toml:",inline"`
+	Env   []envVariable `toml:"env"`
+	Group []buildpack   `toml:"group"`
+}
+
+func v2NoSpecToV2(v2 descriptorV2NoSpec) descriptorV2 {
+	return descriptorV2{
+		Project: v2.Project,
+		IO: ioTable{
+			Buildpacks: cnbTableV2{
+				build: v2.IO.Buildpacks.build,
+				Group: v2.IO.Buildpacks.Group,
+				buildEnvVariableV2: buildEnvVariableV2{
+					BuildEnv: buildEnvVariable{
+						Env: v2.IO.Buildpacks.Env,
+					},
+				},
+			},
+		},
+	}
+}