Grab proot from bootstrap zip rather than including its nix path directly.

This means that the cachix substituter (or already having the package in your nix store somehow) is no longer required to build.

This required reworking the deploy script. As a bonus you can now omit the second argument and it will tell you what it would have copied instead of copying anything.

This is fixes one source of impurity, but for now flake builds will still require the --impure flag

modules/environment/login/default.nix

@@ -37,7 +37,7 @@ in
 
       prootStatic = mkOption {
         type = types.package;
-        readOnly = true;
+        # not readOnly, this needs to be overridden when building bootstrap zip
         internal = true;
         description = "<literal>proot-static</literal> package.";
       };
@@ -84,14 +84,27 @@ in
     environment.files = {
       inherit login loginInner;
 
+      # Ideally this would build the static proot binary, but doing that on aarch64 is HARD so instead pull it from the bootstrap tarball
       prootStatic =
         let
-          crossCompiledPaths = {
-            aarch64-linux = "/nix/store/7qd99m1w65x2vgqg453nd70y60sm3kay-proot-termux-static-aarch64-unknown-linux-android-unstable-2024-05-04";
-            x86_64-linux = "/nix/store/pakj3svvw84rhkzdc6211yhc2cgvc21f-proot-termux-static-x86_64-unknown-linux-android-unstable-2024-05-04";
+          attrs = (import ./proot-attrs).${targetSystem};
+          prootFile = pkgs.fetchurl {
+            name = "proot-static-file";
+            inherit (attrs) url hash;
+
+            downloadToTemp = true;
+            executable = true;
+            postFetch = ''
+              ${pkgs.unzip}/bin/unzip -u $downloadedFile bin/proot-static
+              echo $PWD >&2
+              mv bin/proot-static $out
+            '';
           };
         in
-        "${crossCompiledPaths.${targetSystem}}";
+        pkgs.runCommand "proot-static" { } ''
+          mkdir -p $out/bin
+          cp ${prootFile} $out/bin/proot-static
+        '';
     };
 
   };

modules/environment/login/proot-attrs/aarch64.nix

@@ -0,0 +1,5 @@
+# WARNING: This file is autogenerated by the deploy script. Any changes will be overridden
+{
+  url = "https://nix-on-droid.unboiled.info/bootstrap-testing/bootstrap-aarch64.zip";
+  hash = "sha256-fZyqldmHWbv2e6543mwb5UPcKxcODRg+PDvZNcjVyUU=";
+}

modules/environment/login/proot-attrs/default.nix

@@ -0,0 +1,4 @@
+{
+  x86_64-linux = import ./x86_64.nix;
+  aarch64-linux = import ./aarch64.nix;
+}

modules/environment/login/proot-attrs/x86_64.nix

@@ -0,0 +1,5 @@
+# WARNING: This file is autogenerated by the deploy script. Any changes will be overridden
+{
+  url = "https://nix-on-droid.unboiled.info/bootstrap-testing/bootstrap-x86_64.zip";
+  hash = "sha256-1WZBmFNEmZucOwuzDAFO+Sl+b2XO7Lp1aQr/4egl4wU=";
+}