BuildChain v1.0.0 — on-device Android build toolchain

KernelSU module that turns any rooted phone into a native Android
compiler. Includes aapt2/aapt/aidl/zipalign/dexdump (API 35 static
arm64), BusyBox, platform-tools. Hooks into Termux for Java/Kotlin/
Python/Gradle. bc-build compiles Java/Kotlin to APK or runs Gradle
projects. bc-sign handles debug/release signing. WebUI dashboard
on port 8089. Auto-links tools into system PATH and Termux PATH.

.gitignore

@@ -0,0 +1 @@
+*.zip

build.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+set -e
+cd "$(dirname "$0")"
+
+ZIP="BuildChain-v1.0.0.zip"
+rm -f "$ZIP"
+
+zip -r9 "$ZIP" \
+    module.prop \
+    customize.sh \
+    post-fs-data.sh \
+    service.sh \
+    uninstall.sh \
+    tools/ \
+    scripts/ \
+    webroot/ \
+    -x "*.git*" "build.sh" "sepolicy/*"
+
+echo "Built: $ZIP ($(du -h "$ZIP" | cut -f1))"

customize.sh

@@ -0,0 +1,79 @@
+#!/system/bin/sh
+# BuildChain — KernelSU installation script
+
+SKIPUNZIP=0
+
+ui_print "================================================"
+ui_print " BuildChain v1.0.0"
+ui_print " On-device Android build toolchain"
+ui_print "================================================"
+ui_print ""
+
+DEVICE=$(getprop ro.product.model)
+ARCH=$(uname -m)
+API=$(getprop ro.build.version.sdk)
+
+ui_print "- Device: $DEVICE ($ARCH)"
+ui_print "- Android API: $API"
+ui_print ""
+
+# Verify arch
+case "$ARCH" in
+    aarch64|arm64)
+        ui_print "- Architecture: arm64 (supported)"
+        ;;
+    *)
+        ui_print "! WARNING: Untested architecture: $ARCH"
+        ui_print "! Build tools are compiled for arm64"
+        ;;
+esac
+
+ui_print ""
+ui_print "- Setting up config directory..."
+CONFIG_DIR="/data/adb/buildchain"
+mkdir -p "$CONFIG_DIR"
+echo "$MODPATH" > "$CONFIG_DIR/moddir"
+
+ui_print "- Setting permissions..."
+set_perm_recursive $MODPATH 0 0 0755 0644
+set_perm_recursive $MODPATH/tools 0 2000 0755 0755
+set_perm_recursive $MODPATH/scripts 0 2000 0755 0755
+set_perm $MODPATH/service.sh 0 0 0755
+set_perm $MODPATH/post-fs-data.sh 0 0 0755
+set_perm $MODPATH/uninstall.sh 0 0 0755
+
+# Verify tools work
+ui_print ""
+ui_print "- Testing build tools..."
+for tool in aapt2 aidl zipalign; do
+    if [ -f "$MODPATH/tools/build-tools/$tool" ]; then
+        ui_print "  [OK] $tool"
+    else
+        ui_print "  [!!] $tool missing"
+    fi
+done
+
+if [ -f "$MODPATH/tools/busybox" ]; then
+    APPLETS=$("$MODPATH/tools/busybox" --list 2>/dev/null | wc -l)
+    ui_print "  [OK] busybox ($APPLETS applets)"
+else
+    ui_print "  [!!] busybox missing"
+fi
+
+# Check Termux
+ui_print ""
+if pm list packages 2>/dev/null | grep -q "com.termux"; then
+    ui_print "- Termux: installed"
+    ui_print "- After reboot, open Termux and run:"
+    ui_print "    buildchain setup"
+else
+    ui_print "! Termux not installed"
+    ui_print "! Install Termux from F-Droid, then run: buildchain setup"
+fi
+
+ui_print ""
+ui_print "- Installation complete!"
+ui_print "- Reboot to activate"
+ui_print "- CLI: buildchain status"
+ui_print "- WebUI: http://localhost:8089"
+ui_print ""

scripts/webui-server

@@ -150,8 +150,31 @@ handle_request() {
 }
 
 log "Starting on port $PORT"
+
+# Find a working netcat
+NC=""
+if command -v busybox >/dev/null 2>&1 && busybox nc --help 2>&1 | grep -q "\-ll"; then
+  NC="busybox nc"
+elif [ -f "$MODDIR/tools/busybox" ]; then
+  NC="$MODDIR/tools/busybox nc"
+elif command -v toybox >/dev/null 2>&1; then
+  NC="toybox nc"
+fi
+
+if [ -z "$NC" ]; then
+  log "ERROR: No working netcat found"
+  exit 1
+fi
+
+log "Using: $NC"
+
 while true; do
-  handle_request | busybox nc -ll -p "$PORT" -s 127.0.0.1 2>/dev/null \
-    || handle_request | toybox nc -L -p "$PORT" -s 127.0.0.1 2>/dev/null \
-    || { log "ERROR: No listener"; exit 1; }
+  # Create a FIFO for bidirectional communication
+  FIFO="/data/adb/buildchain/webui.fifo"
+  rm -f "$FIFO"
+  mkfifo "$FIFO"
+
+  # nc reads from client, pipes to handle_request, response goes back via FIFO
+  handle_request < "$FIFO" | $NC -l -p "$PORT" -s 127.0.0.1 > "$FIFO" 2>/dev/null
+  rm -f "$FIFO"
 done