BuildChain v1.0.0 — on-device Android build toolchain

System-level KernelSU module: aapt2/aidl/zipalign (API 35), BusyBox,
platform-tools, all as static arm64 binaries in the Android framework.

Termux integration for Java/Kotlin/Gradle/Python via pkg.
CLI tools: buildchain, bc-build, bc-sign.
WebUI on :8089 for toolchain management.

Turns any Android phone into a native compilation powerhouse.

post-fs-data.sh

@@ -0,0 +1,26 @@
+#!/system/bin/sh
+# BuildChain — early boot: install busybox applets system-wide, set up paths
+MODDIR=${0%/*}
+CONFIG_DIR="/data/adb/buildchain"
+
+mkdir -p "$CONFIG_DIR"
+echo "$MODDIR" > "$CONFIG_DIR/moddir"
+
+# Install busybox applets to /system/xbin via module overlay
+XBIN="$MODDIR/system/xbin"
+mkdir -p "$XBIN"
+
+if [ -f "$MODDIR/tools/busybox" ]; then
+  cp "$MODDIR/tools/busybox" "$XBIN/busybox"
+  chmod 0755 "$XBIN/busybox"
+
+  # Create symlinks for all busybox applets
+  "$XBIN/busybox" --list 2>/dev/null | while read applet; do
+    [ "$applet" = "busybox" ] && continue
+    # Don't override core Android binaries
+    case "$applet" in
+      sh|ls|cat|cp|mv|rm|mkdir|chmod|chown|mount|umount|reboot|ps|kill|ln|df|du) continue ;;
+    esac
+    ln -sf busybox "$XBIN/$applet" 2>/dev/null
+  done
+fi