feat: vmisobuild.sh (ISO build in the VM, package cache per VM), vmisoboot.sh (ISO VM for Calamares), qmpshot.py/qmpclick.py; run.sh VM_CACHE/VM_CPUS/VM_NOGL/VM_PORT

scripts/qmpshot.py

@@ -0,0 +1,27 @@
+# qmpshot.py <qmp socket> <out.png>: screenshot of the VM's screen over QMP
+# (screendump). Needs a VM without virgl (run.sh with VM_NOGL=1): with
+# virgl QEMU answers "no surface". Before the guest's desktop is up it shows
+# whatever is on screen (boot menu, Calamares, ...).
+import json, os, socket, sys, tempfile
+
+sock, out = sys.argv[1], sys.argv[2]
+s = socket.socket(socket.AF_UNIX); s.connect(sock); f = s.makefile("rw"); f.readline()
+def cmd(c):
+    f.write(json.dumps(c) + "\n"); f.flush()
+    while True:
+        r = json.loads(f.readline())
+        if "event" not in r:
+            return r
+cmd({"execute": "qmp_capabilities"})
+ppm = tempfile.mktemp(suffix=".ppm")
+r = cmd({"execute": "screendump", "arguments": {"filename": ppm, "format": "ppm"}})
+if "error" in r:
+    raise SystemExit("screendump: %s" % r["error"]["desc"])
+try:
+    from PIL import Image
+    Image.open(ppm).save(out)
+    os.remove(ppm)
+except ImportError:
+    os.replace(ppm, os.path.splitext(out)[0] + ".ppm")
+    print("PIL missing: wrote a .ppm instead", file=sys.stderr)
+print(out)