start to split behaviour on presence of network or not

bin/subiquity-configure-apt

@@ -15,13 +15,14 @@ setup_overlay () {
 $PY -m curtin apt-config
 
 setup_overlay $TARGET_MOUNT_POINT/etc/apt
-setup_overlay $TARGET_MOUNT_POINT/var/lib/apt/lists
 
 cat > "/tmp/sources.list" <<EOF
 deb file:///run/cdrom $(lsb_release -sc) main restricted
 EOF
 if [ $HAS_NETWORK = 'true' ]; then
     cat "$TARGET_MOUNT_POINT/etc/apt/sources.list" >> "/tmp/sources.list"
+else
+    setup_overlay $TARGET_MOUNT_POINT/var/lib/apt/lists
 fi
 mv /tmp/sources.list "$TARGET_MOUNT_POINT/etc/apt/sources.list"
 $PY -m curtin in-target -- apt-get update

subiquity/controllers/installprogress.py

@@ -298,8 +298,14 @@ class InstallProgressController(BaseController):
         else:
             cmds = [
                 ["umount", self.tpath('etc/apt')],
-                ["umount", self.tpath('var/lib/apt/lists')],
                 ]
+            if self.base_model.network.has_network:
+                cmds.append([
+                    sys.executable, "-m", "curtin", "in-target", "-t",
+                    "/target", "--", "apt-get", "update",
+                    ])
+            else:
+                cmds.append(["umount", self.tpath('var/lib/apt/lists')])
         for cmd in cmds:
             self._bg_run_command_logged(cmd)
 

subiquity/models/subiquity.py

@@ -158,7 +158,7 @@ class SubiquityModel:
             'curthooks_commands': {
                 '000-configure-apt': [
                     '/snap/bin/subiquity.subiquity-configure-apt',
-                    sys.executable, 'true',
+                    sys.executable, str(self.network.has_network).lower(),
                     ],
                 },