Add interactive-defaults.ks to updates image

The interactive-defaults is must have to enable testing of web ui on the
boot.iso because we don't have support for package based installations
there. This way we are serving the tarball for the VM which will be used
as payload to overcome this missing implementation.

Do not SSH the interactive-defaults.ks into the VM when it's running but
instead add the interactive-defaults.ks to the updates.img.
The SSH copy of interactive-defaults.ks works but not reliably. The
issue is that we are copying the interactive-defaults.ks to the running
installation and if the file will land too late it won't be taken by the
installer.

To avoid this issue add the interactive-defaults.ks content to the
updates image before the VM is started.

test/machine_install.py

@@ -20,6 +20,7 @@
 import subprocess
 import sys
 import time
+from tempfile import TemporaryDirectory
 
 WEBUI_TEST_DIR = os.path.dirname(__file__)
 ROOT_DIR = os.path.dirname(WEBUI_TEST_DIR)
@@ -83,10 +84,20 @@ def _serve_payload(self):
 
         return payload_cached_name, http_payload_port
 
-    def _write_interactive_defaults_ks(self):
+    def _write_interactive_defaults_ks(self, updates_image):
         payload_cached_name, http_payload_port = self._serve_payload()
         content = f'liveimg --url="http://10.0.2.2:{http_payload_port}/{payload_cached_name}"'
-        Machine.execute(self, f'echo \'{content}\' > /usr/share/anaconda/interactive-defaults.ks')
+        defaults_path = "usr/share/anaconda/"
+        print("Adding interactive defaults to updates.img")
+        with TemporaryDirectory() as tmp_dir:
+            os.makedirs(f"{tmp_dir}/{defaults_path}")
+            # unpack initrd to the temporary directory
+            os.system(f"cd {tmp_dir} && gzip -dc {updates_image} | cpio -idu")
+            # add new interactive-defaults.ks (have to be available at start of the installer)
+            with open(f"{tmp_dir}/{defaults_path}/interactive-defaults.ks", "wt", encoding="utf-8") as f:
+                f.write(content)
+            # pack the updates.img again and replace the original one
+            os.system(f"cd {tmp_dir} && find . | cpio -c -o | gzip -9cv > {updates_image}")
 
     def start(self):
         update_img_file = os.path.join(ROOT_DIR, "updates.img")
@@ -118,6 +129,10 @@ def start(self):
         else:
             location = f"{iso_path}"
 
+        if not self.is_live():
+            # Configure the payload in interactive-defaults.ks
+            self._write_interactive_defaults_ks(update_img_file)
+
         if self.efi:
             boot_arg = "--boot uefi "
         else:
@@ -153,9 +168,6 @@ def start(self):
             if not self.is_live():
                 Machine.wait_boot(self, timeout_sec=300)
 
-                # Configure the payload in interactive-defaults.ks
-                self._write_interactive_defaults_ks()
-
                 for _ in range(30):
                     try:
                         Machine.execute(self, "journalctl -t anaconda | grep 'anaconda: ui.webui: cockpit web view has been started'")