require_dev_touchscreen.patch

--- a/pmb/config/__init__.py
+++ b/pmb/config/__init__.py
@@ -161,41 +161,44 @@ apkbuild_attributes = {
 }
 
 # Variables from deviceinfo. Reference: <https://postmarketos.org/deviceinfo>
-deviceinfo_attributes = [
+# When the value is True, the variable is required.
+deviceinfo_attributes = {
     # device
-    "format_version",
-    "name",
-    "manufacturer",
-    "date",
-    "keyboard",
-    "nonfree",
-    "dtb",
-    "modules_initfs",
-    "external_disk",
-    "external_disk_install",
-    "flash_methods",
-    "arch",
+    "dev_keyboard": False,
+    "dev_touchscreen": True,
+    "format_version": False,
+    "name": False,
+    "manufacturer": False,
+    "date": False,
+    "keyboard": False,
+    "nonfree": False,
+    "dtb": False,
+    "modules_initfs": False,
+    "external_disk": False,
+    "external_disk_install": False,
+    "flash_methods": False,
+    "arch": False,
 
     # flash
-    "generate_bootimg",
-    "generate_legacy_uboot_initfs",
-    "flash_heimdall_partition_initfs",
-    "flash_heimdall_partition_kernel",
-    "flash_offset_base",
-    "flash_offset_kernel",
-    "flash_offset_ramdisk",
-    "flash_offset_second",
-    "flash_offset_tags",
-    "flash_pagesize",
-    "flash_sparse",
-    "kernel_cmdline",
+    "generate_bootimg": False,
+    "generate_legacy_uboot_initfs": False,
+    "flash_heimdall_partition_initfs": False,
+    "flash_heimdall_partition_kernel": False,
+    "flash_offset_base": False,
+    "flash_offset_kernel": False,
+    "flash_offset_ramdisk": False,
+    "flash_offset_second": False,
+    "flash_offset_tags": False,
+    "flash_pagesize": False,
+    "flash_sparse": False,
+    "kernel_cmdline": False,
 
     # weston
-    "weston_pixman_type",
+    "weston_pixman_type": False,
 
     # keymaps
-    "keymaps",
-]
+    "keymaps": False,
+}
 
 #
 # INITFS
diff --git a/pmb/parse/deviceinfo.py b/pmb/parse/deviceinfo.py
index 9b7c379..ec398c8 100644
--- a/pmb/parse/deviceinfo.py
+++ b/pmb/parse/deviceinfo.py
@@ -50,9 +50,15 @@ def deviceinfo(args, device=None):
             value = split[1].replace("\"", "").replace("\n", "")
             ret[key] = value
 
-    # Assign empty string as default
+    # Required keys check, default to empty string
     for key in pmb.config.deviceinfo_attributes:
         if key not in ret:
-            ret[key] = ""
+            if pmb.config.deviceinfo_attributes[key]:
+                raise RuntimeError("Missing key 'deviceinfo_" + key + "' in " +
+                                   path + "! Please add it and try again. See"
+                                   " <https://postmarketos.org/deviceinfo> for"
+                                   " reference.")
+            else:
+                ret[key] = ""
 
     return ret