Stages: support vmdk subformat in the qemu stage

Support specifying the subformat for the `vmdk` image type in the
`org.osbuild.qemu` stage.

stages/org.osbuild.qemu

@@ -61,6 +61,11 @@ SCHEMA_2 = r"""
         "description": "The type of the format, here 'vmdk'",
         "type": "string",
         "enum": ["vmdk"]
+      },
+      "subformat": {
+        "description": "VMDK flat extent format",
+        "type": "string",
+        "enum": ["monolithicSparse", "monolithicFlat", "twoGbMaxExtentSparse", "twoGbMaxExtentFlat", "streamOptimized"]
       }
     }
   },
@@ -133,6 +138,14 @@ def qcow2_arguments(options):
     return argv
 
 
+def vmdk_arguments(options):
+    argv = ["-c"]
+    subformat = options.get("subformat")
+    if subformat:
+        argv += ["-o", f"subformat={subformat}"]
+    return argv
+
+
 def parse_input(inputs):
     image = inputs["image"]
     files = image["data"]["files"]
@@ -153,7 +166,7 @@ def main(inputs, output, options):
     formats = {
         "qcow2": qcow2_arguments,
         "vdi": [],
-        "vmdk": ["-c"],
+        "vmdk": vmdk_arguments,
         "vpc": ["-o", "subformat=fixed,force_size"],
         "vhdx": []
     }

test/data/stages/qemu/checks.json

@@ -17,6 +17,15 @@
   "image.vmdk": {
     "format": "vmdk"
   },
+  "image-stream.vmdk": {
+    "format": "vmdk",
+    "format-specific": {
+      "type": "vmdk",
+      "data": {
+        "create-type": "streamOptimized"
+      }
+    }
+  },
   "image.vpc": {
     "format": "raw"
   },

test/data/stages/qemu/qemu.json

@@ -468,6 +468,33 @@
         }
       ]
     },
+    {
+      "name": "image-stream.vmdk",
+      "build": "name:build",
+      "stages": [
+        {
+          "type": "org.osbuild.qemu",
+          "inputs": {
+            "image": {
+              "type": "org.osbuild.files",
+              "origin": "org.osbuild.pipeline",
+              "references": {
+                "name:image": {
+                  "file": "image.raw"
+                }
+              }
+            }
+          },
+          "options": {
+            "filename": "image-stream.vmdk",
+            "format": {
+              "type": "vmdk",
+              "subformat": "streamOptimized"
+            }
+          }
+        }
+      ]
+    },
     {
       "name": "image.vpc",
       "build": "name:build",

test/data/stages/qemu/qemu.mpp.json

@@ -126,6 +126,33 @@
         }
       ]
     },
+    {
+      "name": "image-stream.vmdk",
+      "build": "name:build",
+      "stages": [
+        {
+          "type": "org.osbuild.qemu",
+          "inputs": {
+            "image": {
+              "type": "org.osbuild.files",
+              "origin": "org.osbuild.pipeline",
+              "references": {
+                "name:image": {
+                  "file": "image.raw"
+                }
+              }
+            }
+          },
+          "options": {
+            "filename": "image-stream.vmdk",
+            "format": {
+              "type": "vmdk",
+              "subformat": "streamOptimized"
+            }
+          }
+        }
+      ]
+    },
     {
       "name": "image.vpc",
       "build": "name:build",