Add a build script to patch paths and inject proot

.gitignore

@@ -1,2 +1,3 @@
 result
 result-*
+out

build.sh

@@ -0,0 +1,58 @@
+#!/usr/bin/env bash
+
+set -e
+
+repo=${repo:-t184256/nix-on-droid-bootstrap}  # set this to your fork!
+branch=${branch:-$(git rev-parse --abbrev-ref HEAD)}
+
+arches='aarch64 i686'
+nixOnDroidChannelURL=https://github.com/$repo/archive/$branch.tar.gz
+
+mkdir -p out
+rm -f out/*
+for arch in $arches; do
+	echo $arch: building talloc...
+	nix build --show-trace -f pkgs --argstr arch $arch tallocStatic -o out/talloc-$arch
+	talloc=$(realpath out/talloc-$arch)
+
+	echo $arch: building proot...
+	nix build --show-trace -f pkgs --argstr arch $arch prootTermux -o out/proot-$arch
+	proot=$(realpath out/proot-$arch)
+
+	echo $arch: patching proot path in modules/environment/login/default.nix...
+	grep "$arch = \"/nix/store/" modules/environment/login/default.nix
+	sed -i "s|$arch = \"/nix/store/.*\";|$arch = \"$proot\";|" modules/environment/login/default.nix
+	grep "$arch = \"/nix/store/" modules/environment/login/default.nix
+
+	echo $arch: building nix-on-droid...
+	nix build --show-trace -f pkgs --argstr arch $arch --argstr nixOnDroidChannelURL $nixOnDroidChannelURL bootstrapZip -o out/nix-on-droid-$arch
+
+	echo $arch: injecting talloc/proot for initial bootstrap
+	pwd
+
+	cat out/nix-on-droid-$arch/bootstrap-$arch.zip > out/bootstrap-$arch.zip
+	nix-store --export --readonly-mode $talloc > out/talloc-$arch.closure
+	nix-store --export --readonly-mode $proot > out/proot-$arch.closure
+
+	mkdir out/repack-$arch
+	pushd out/repack-$arch >/dev/null
+	unzip -q ../bootstrap-$arch.zip
+	rm ../bootstrap-$arch.zip
+	cp ../talloc-$arch.closure ./talloc.closure
+	cp ../proot-$arch.closure ./proot.closure
+	zip --quiet -r ../bootstrap-$arch.zip .
+	popd >/dev/null
+	chmod -R +w out/repack-$arch
+	rm -rf out/repack-$arch
+done
+
+
+if [ -z "$rsync_to" ]; then
+	echo 'Done. Now put out/bootstrap-*.zip on some HTTP server and point the app to it. Good luck!'
+else
+	if [ $branch == master ]; then
+		rsync -vP out/bootstrap-*.zip "$rsync_to/bootstrap/"
+	else
+		rsync -vP out/bootstrap-*.zip "$rsync_to/bootstrap-$branch/"
+	fi
+fi

modules/environment/login/default.nix

@@ -84,9 +84,12 @@ in
       inherit login loginInner;
 
       prootStatic =
-        if config.build.arch == "aarch64"
-        then "/nix/store/r09n7pp4fwhrld2a1k2al6bgdx2qqfaj-proot-termux-unstable-2019-09-05-aarch64-unknown-linux-android"
-        else "/nix/store/ccv4y9ndl1w7ksmwnsr9jm2iwnrrbgcq-proot-termux-unstable-2019-09-05-i686-unknown-linux-android";
+        let crosscompiled_paths = {
+         aarch64 = "/nix/store/r09n7pp4fwhrld2a1k2al6bgdx2qqfaj-proot-termux-unstable-2019-09-05-aarch64-unknown-linux-android";
+         i686 = "/nix/store/4gpm0rmrq0mm69kl3cb1gjslr7ihhp01-proot-termux-unstable-2019-09-05-i686-unknown-linux-android";
+        };
+        in
+        "${crosscompiled_paths.${config.build.arch}}";
     };
 
   };

modules/environment/login/login-inner.nix

@@ -32,6 +32,17 @@ writeText "login-inner" ''
 
       export NIX_SSL_CERT_FILE=${cacert}
 
+      if [ -r ${config.build.installationDir}/proot.closure ]; then
+        echo "Injecting bundled talloc closure..."
+        ${nix}/bin/nix-store --import < ${config.build.installationDir}/talloc.closure
+        ${coreutils}/bin/rm -f ${config.build.installationDir}/talloc.closure
+        echo "Injecting bundled proot closure..."
+        ${nix}/bin/nix-store --import < ${config.build.installationDir}/proot.closure
+        ${coreutils}/bin/rm -f ${config.build.installationDir}/proot.closure
+      else
+        echo "No bundled talloc/proot closures found, which is OK for official builds..."
+      fi
+
       echo "Installing and updating nix-channels..."
       ${nix}/bin/nix-channel --add ${config.build.channel.nixpkgs} nixpkgs
       ${nix}/bin/nix-channel --update nixpkgs