From e7620feca4afb2e3e8ff4202bef7cce8b5c1beb6 Mon Sep 17 00:00:00 2001
From: Christian Kellner <christian@kellner.me>
Date: Wed, 7 Apr 2021 16:11:13 +0000
Subject: [PATCH] assemblers/qemu: support for qcow2 compat version

Add a new option `qcow2_comapt` which can be used explicitly
select the compatibility level of the qcow2 file format. Qemu
version 1.1 introduced extensions to the format that became
the default with 1.7, which are not readable by qemu < 1.1.
Thus if the resulting qcow2 should be read by such older qemu
versions, the compatibility level needs to be set to 0.10.
---
 assemblers/org.osbuild.qemu | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/assemblers/org.osbuild.qemu b/assemblers/org.osbuild.qemu
index e6bb648b..ecee8450 100755
--- a/assemblers/org.osbuild.qemu
+++ b/assemblers/org.osbuild.qemu
@@ -59,6 +59,10 @@ SCHEMA = """
     "type": "string",
     "enum": ["raw", "raw.xz", "qcow2", "vdi", "vmdk", "vpc", "vhdx"]
   },
+  "qcow2_compat": {
+    "description": "The qcow2-compatibility-version to use",
+    "type": "string"
+  },
   "filename": {
     "description": "Image filename",
     "type": "string"
@@ -690,6 +694,11 @@ def main(tree, output_dir, options, loop_client):
             "vpc": ["-o", "subformat=fixed,force_size"],
             "vhdx": []
         }
+
+        compat = options.get("qcow2_compat")
+        if compat:
+            extra_args["qcow2"] += ["-o", f"compat={compat}"]
+
         subprocess.run([
             "qemu-img",
             "convert",