cloudapi/v2: introduce multi build composes

This only extends the API, the backend can still only deal with composes of a single build.

I aimed to keep the API practically backwards compatible, i.e., no current consumer of it should notice the change. I hope I didn't mess that up.

fixup: image statuses

internal/cloudapi/v2/openapi.v2.gen.go

@@ -165,7 +165,8 @@ type ComposeMetadata struct {
 type ComposeRequest struct {
 	Customizations *Customizations `json:"customizations,omitempty"`
 	Distribution   string          `json:"distribution"`
-	ImageRequest   ImageRequest    `json:"image_request"`
+	ImageRequest   *ImageRequest   `json:"image_request,omitempty"`
+	ImageRequests  *[]ImageRequest `json:"image_requests,omitempty"`
 	Koji           *Koji           `json:"koji,omitempty"`
 }
 
@@ -174,9 +175,10 @@ type ComposeStatus struct {
 	// Embedded struct due to allOf(#/components/schemas/ObjectReference)
 	ObjectReference `yaml:",inline"`
 	// Embedded fields due to inline allOf schema
-	ImageStatus ImageStatus        `json:"image_status"`
+	ImageStatus   ImageStatus        `json:"image_status"`
-	KojiStatus  *KojiStatus        `json:"koji_status,omitempty"`
+	ImageStatuses *[]ImageStatus     `json:"image_statuses,omitempty"`
-	Status      ComposeStatusValue `json:"status"`
+	KojiStatus    *KojiStatus        `json:"koji_status,omitempty"`
+	Status        ComposeStatusValue `json:"status"`
 }
 
 // ComposeStatusValue defines model for ComposeStatusValue.
@@ -551,68 +553,69 @@ func RegisterHandlersWithBaseURL(router EchoRouter, si ServerInterface, baseURL
 // Base64 encoded, gzipped, json marshaled Swagger object
 var swaggerSpec = []string{
 
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+	"SIAqBIMYxaArFYk4q/+SofyZhL3U3+LOqjbmN4e206GtX+t2teu6fpTl4x/7S5TyKL/5uW9+7u/h5zq+",
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+	"SSs0rimy9neGuKz5t46LWb9/7DgX387WU/rmompTA6o2z9xk/aGmv96DT9vtbwD4HDkwvpnZX2NmVtH/",
-	"ae1mu4sizGybiZHqp2oW2fp56WyFzNHpd9T9MoCK7u899Ud/8hlebeU3H/3mo0/xUbu2Ttr4ZdU03Xz+",
+	"fkaGKwXCaYpyLiWdpVBp09rMdhdFmNk2EyPV7+isZOvnpbMVMqHTb6j7ZQAV3d8b9Ud/cgyvjvKbjX6z",
-	"vXNT/FbdBOvIGW9FlCGtA/cK9++YOWwV57G6svTFmTfuJSuPC2KfX1cvfJptcZzTnuYjE+p+BIpz2rdv",
+	"0afYqF1bJ23ssmqabo5/79wUv1Y3hXXkjLUiypDGwL3C/TtmDlu381hdWfr8zBv3kpXHBbHPr6sXPs22",
-	"r0zvHURUPqPvPwxNPtFq1iu8oGyxjYFUeAG/k41RIitf2lZsdtG5ffy/AAAA//8JG9vrnEIAAA==",
+	"OM5pT/ORCXW/UMU57du3V6b3DiIqn9H3H4Ymn2g16xVeULbYxkAqvIDfycaAyMqXthWbXXRuH/8vAAD/",
+	"/4MyIy45QwAA",
 }
 
 // GetSwagger returns the content of the embedded swagger specification file

internal/cloudapi/v2/openapi.v2.yml

@@ -357,6 +357,10 @@ components:
             $ref: '#/components/schemas/ComposeStatusValue'
           image_status:
             $ref: '#/components/schemas/ImageStatus'
+          image_statuses:
+            type: array
+            items:
+              $ref: '#/components/schemas/ImageStatus'
           koji_status:
             $ref: '#/components/schemas/KojiStatus'
     ComposeStatusValue:
@@ -491,13 +495,16 @@ components:
     ComposeRequest:
       required:
         - distribution
-        - image_request
       properties:
         distribution:
           type: string
           example: 'rhel-8'
         image_request:
           $ref: '#/components/schemas/ImageRequest'
+        image_requests:
+          type: array
+          items:
+            $ref: '#/components/schemas/ImageRequest'
         customizations:
           $ref: '#/components/schemas/Customizations'
         koji:

internal/cloudapi/v2/v2.go

@@ -184,7 +184,24 @@ func (h *apiHandlers) PostCompose(ctx echo.Context) error {
 	}
 	manifestSeed := bigSeed.Int64()
 
-	ir := request.ImageRequest
+	// For backwards compatibility, we support both a single image request
+	// as well as an array of requests in the API. In case both are
+	// specified we merge them together.
+	irs := make([]ImageRequest, 0)
+	if request.ImageRequest != nil {
+		irs = append(irs, *request.ImageRequest)
+	}
+	if request.ImageRequests != nil {
+		irs = append(irs, (*request.ImageRequests)...)
+	}
+	// For now, we only actually support one image request, no matter
+	// how it is specified.
+	// TODO: drop this limitation
+	if len(irs) != 1 {
+		return HTTPError(ErrorInvalidNumberOfImageBuilds)
+	}
+	ir := irs[0]
+
 	arch, err := distribution.GetArch(ir.Architecture)
 	if err != nil {
 		return HTTPError(ErrorUnsupportedArchitecture)
@@ -733,8 +750,10 @@ func (h *apiHandlers) GetComposeStatus(ctx echo.Context, id string) error {
 				Kind: "ComposeStatus",
 			},
 			Status: composeStatusFromKojiJobStatus(finalizeStatus, &initResult, []worker.OSBuildKojiJobResult{buildResult}, &result),
-			ImageStatus: ImageStatus{
+			ImageStatuses: &[]ImageStatus{
-				Status: imageStatusFromKojiJobStatus(buildJobStatus, &initResult, &buildResult),
+				{
+					Status: imageStatusFromKojiJobStatus(buildJobStatus, &initResult, &buildResult),
+				},
 			},
 			KojiStatus: &KojiStatus{},
 		}