twrp: Prepare for multiple branches

Author: samueldr

flavors/twrp/default.nix

@@ -9,11 +9,16 @@ let
     mkIf
     mkMerge
   ;
-  TWRPBranch = "twrp-9.0";
+  androidVersionToTWRPBranch = {
+    "9" = "twrp-9.0";
+  };
+  TWRPBranch = androidVersionToTWRPBranch.${toString config.androidVersion};
   repoDirs = lib.importJSON (./. + "/${TWRPBranch}/repo.json");
 in mkIf (config.flavor == "twrp")
+(mkMerge [
 {
-  androidVersion = mkDefault 9;
+  # Defaults elsewhere makes it default to `12` if unset.
+  androidVersion = mkDefault (builtins.throw "androidVersion needs to be set according to your device tree.");
 
   # product names start with "omni_"
   #  → lunch omni_sailfish-eng
@@ -26,18 +31,6 @@ in mkIf (config.flavor == "twrp")
 
   source.dirs = mkMerge ([
     repoDirs
-    {
-      "bootable/recovery" = {
-        patches = [
-          ./patches/android_bootable_recovery/0001-gui-Don-t-preserve-mode-owner-when-copying-files.patch
-        ];
-      };
-      "build/make" = {
-        patches = [
-          ./patches/android_build/0001-Work-around-source-files-being-read-only.patch
-        ];
-      };
-    }
   ]);
 
   source.manifest.url = mkDefault "https://github.com/minimal-manifest-twrp/platform_manifest_twrp_omni.git";
@@ -56,3 +49,20 @@ in mkIf (config.flavor == "twrp")
     };
   };
 }
+(mkIf (config.androidVersion == 9) {
+  source.dirs = mkMerge ([
+    repoDirs
+    {
+      "bootable/recovery" = {
+        patches = [
+          ./patches/android_bootable_recovery/0001-gui-Don-t-preserve-mode-owner-when-copying-files.patch
+        ];
+      };
+      "build/make" = {
+        patches = [
+          ./patches/android_build/0001-Work-around-source-files-being-read-only.patch
+        ];
+      };
+    }
+  ]);
+})