project: add Image to the configuration

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

pkg/project/project.go

@@ -20,21 +20,24 @@ type Project struct {
 	Name     string
 	RootDir  string `yaml:"-"`
 	Binaries *projectBinaries
+	Image    string
 }
 
 // ChainkitManifest defines the name of the manifest file
 const ChainkitManifest = "chainkit.yml"
 
 // New will create a new project in the given directory.
 func New(dir, name string) *Project {
-	return &Project{
+	p := &Project{
 		Name: name,
 		Binaries: &projectBinaries{
 			CLI:    name + "cli",
 			Daemon: name + "d",
 		},
 		RootDir: path.Join(dir, name),
 	}
+	p.SetDefaults()
+	return p
 }
 
 // Save serializes the project data on disk
@@ -53,9 +56,36 @@ func (p *Project) Save() error {
 	return nil
 }
 
+// Validate runs sanity checks against the project
+func (p *Project) Validate() error {
+	errorOut := func(field string) error {
+		return fmt.Errorf("missing required field %q", field)
+	}
+
+	switch {
+	case p.Name == "":
+		return errorOut("name")
+	case p.Binaries == nil:
+		return errorOut("binaries")
+	case p.Binaries.CLI == "":
+		return errorOut("binaries.cli")
+	case p.Binaries.Daemon == "":
+		return errorOut("binaries.daemon")
+	}
+
+	return nil
+}
+
+func (p *Project) SetDefaults() {
+	switch {
+	case p.Image == "":
+		p.Image = fmt.Sprintf("chainkit-%s", p.Name)
+	}
+}
+
 // Load will load a project from a given directory
 func Load(dir string) (*Project, error) {
-	errMsg := fmt.Sprintf("Cannot read manifest \"%s\"", ChainkitManifest)
+	errMsg := fmt.Sprintf("Cannot read manifest %q", ChainkitManifest)
 	data, err := ioutil.ReadFile(path.Join(dir, ChainkitManifest))
 	if err != nil {
 		return nil, errors.Wrap(err, errMsg)
@@ -65,5 +95,12 @@ func Load(dir string) (*Project, error) {
 		return nil, errors.Wrap(err, errMsg)
 	}
 	p.RootDir = dir
+
+	if err := p.Validate(); err != nil {
+		return nil, errors.Wrap(err, fmt.Sprintf("%s validation", ChainkitManifest))
+	}
+
+	p.SetDefaults()
+
 	return p, nil
 }