fix: cross-compile bundled Android git libs with Rust

.gitea/workflows/android-build.yml

@@ -96,14 +96,28 @@ jobs:
           set -euxo pipefail
           printf 'sdk.dir=%s/.android/sdk\n' "$HOME" > local.properties
 
+      - name: Install Rust toolchain
+        shell: bash
+        run: |
+          set -euxo pipefail
+          if ! command -v cargo >/dev/null 2>&1; then
+            curl https://sh.rustup.rs -sSf | sh -s -- -y --profile minimal
+          fi
+          echo "$HOME/.cargo/bin" >> "$GITHUB_PATH"
+          export PATH="$HOME/.cargo/bin:$PATH"
+          cargo --version
+          rustc --version
+          rustup target add aarch64-linux-android armv7-linux-androideabi i686-linux-android x86_64-linux-android
+
       - name: Compile bundled native Git binaries
         shell: bash
         run: |
           set -euxo pipefail
+          export PATH="$HOME/.cargo/bin:$PATH"
           export ANDROID_SDK_ROOT="$HOME/.android/sdk"
           export ANDROID_HOME="$ANDROID_SDK_ROOT"
           chmod +x ./AndroidProjectTooling.sh
-          bash ./AndroidProjectTooling.sh --compile-git
+          bash ./AndroidProjectTooling.sh --compile-android-git
 
       - name: Prepare CI build metadata
         id: build_meta
@@ -151,6 +165,8 @@ jobs:
           required = {
               'lib/arm64-v8a/libgit.so',
               'lib/armeabi-v7a/libgit.so',
+              'lib/x86/libgit.so',
+              'lib/x86_64/libgit.so',
           }
           found = {name for name in names if name in required}
           print('APK_NATIVE_GIT', sorted(found))
@@ -182,6 +198,8 @@ jobs:
           required = {
               'base/lib/arm64-v8a/libgit.so',
               'base/lib/armeabi-v7a/libgit.so',
+              'base/lib/x86/libgit.so',
+              'base/lib/x86_64/libgit.so',
           }
           found = {name for name in names if name in required}
           print('AAB_NATIVE_GIT', sorted(found))

AndroidProjectTooling.sh

@@ -48,7 +48,7 @@ quiet_log_name() {
   local arg
   for arg in "$@"; do
     case "$arg" in
-      --build|--build-release-aab|--test|--clean-test|--test-emulator|--compile-git)
+      --build|--build-release-aab|--test|--clean-test|--test-emulator|--compile-git|--compile-android-git)
         mode="${arg#--}"
         ;;
     esac
@@ -502,10 +502,11 @@ build_host_git() {
 build_android_git_for_abi() {
   local abi="$1"
   local cc="$2"
+  local rust_target="$3"
   local output_dir="$ANDROID_JNI_DIR/$abi"
   local output_binary="$output_dir/libgit.so"
   local stamp="$output_dir/.source-fingerprint"
-  local fingerprint="$3:android:$abi:$cc:$ANDROID_API:githug-embedded-main"
+  local fingerprint="$4:android:$abi:$cc:$rust_target:$ANDROID_API:githug-embedded-main"
 
   require_path "$ANDROID_TOOLBIN/$cc"
 
@@ -530,6 +531,7 @@ build_android_git_for_abi() {
     AR=llvm-ar \
     RANLIB=llvm-ranlib \
     STRIP=llvm-strip \
+    RUST_TARGETS="$rust_target" \
     "${make_args[@]}" \
     git
 
@@ -554,10 +556,10 @@ build_android_git() {
   local fingerprint
   fingerprint="$(git_source_fingerprint)"
 
-  build_android_git_for_abi "arm64-v8a" "aarch64-linux-android${ANDROID_API}-clang" "$fingerprint"
-  build_android_git_for_abi "armeabi-v7a" "armv7a-linux-androideabi${ANDROID_API}-clang" "$fingerprint"
-  build_android_git_for_abi "x86" "i686-linux-android${ANDROID_API}-clang" "$fingerprint"
-  build_android_git_for_abi "x86_64" "x86_64-linux-android${ANDROID_API}-clang" "$fingerprint"
+  build_android_git_for_abi "arm64-v8a" "aarch64-linux-android${ANDROID_API}-clang" "aarch64-linux-android" "$fingerprint"
+  build_android_git_for_abi "armeabi-v7a" "armv7a-linux-androideabi${ANDROID_API}-clang" "armv7-linux-androideabi" "$fingerprint"
+  build_android_git_for_abi "x86" "i686-linux-android${ANDROID_API}-clang" "i686-linux-android" "$fingerprint"
+  build_android_git_for_abi "x86_64" "x86_64-linux-android${ANDROID_API}-clang" "x86_64-linux-android" "$fingerprint"
 }
 
 build_all_git_targets() {
@@ -786,6 +788,11 @@ maybe_run_operation() {
       build_all_git_targets
       return
       ;;
+    --compile-android-git)
+      setup_env
+      build_android_git
+      return
+      ;;
     *)
       return
       ;;
@@ -850,7 +857,7 @@ maybe_run_operation() {
 
 print_usage() {
   cat <<EOF_USAGE
-Usage: bash ./AndroidProjectTooling.sh [--quiet] [--build | --build-release-aab | --test | --clean-test | --test-emulator [--hide-emulator-window] | --compile-git]
+Usage: bash ./AndroidProjectTooling.sh [--quiet] [--build | --build-release-aab | --test | --clean-test | --test-emulator [--hide-emulator-window] | --compile-git | --compile-android-git]
 
   --build      Set up the environment and build the debug APK
   --build-release-aab  Set up the environment and build a release Android App Bundle (AAB)
@@ -859,6 +866,7 @@ Usage: bash ./AndroidProjectTooling.sh [--quiet] [--build | --build-release-aab
   --test-emulator  Set up a visible Android emulator and run debug instrumentation tests on it
   --hide-emulator-window  Run --test-emulator with the emulator window hidden
   --compile-git  Compile Git for the development host and all Android target ABIs
+  --compile-android-git  Compile Git only for the Android target ABIs used by the app
   --quiet      Write full output to build/reports/android-project-tooling/ and print only a concise result
 EOF_USAGE
 }
@@ -872,7 +880,7 @@ validate_args() {
   shift || true
 
   case "$mode" in
-    ""|--build|--build-release-aab|--test|--clean-test|--test-emulator|--compile-git)
+    ""|--build|--build-release-aab|--test|--clean-test|--test-emulator|--compile-git|--compile-android-git)
       ;;
     *)
       echo "Unknown argument: $mode" >&2
@@ -913,11 +921,18 @@ main() {
   require_tool git
   require_tool perl
   require_tool make
-  require_tool clang
   require_tool pkg-config
   require_tool readelf
   require_tool file
 
+  local mode="${1:-}"
+  if [ "$mode" = "--build" ] || [ "$mode" = "--build-release-aab" ] || [ "$mode" = "--test" ] || [ "$mode" = "--clean-test" ] || [ "$mode" = "--compile-git" ] || [ "$mode" = "--test-emulator" ] || [ "$mode" = "--compile-android-git" ]; then
+    require_tool cargo
+  fi
+  if [ "$mode" = "--build" ] || [ "$mode" = "--build-release-aab" ] || [ "$mode" = "--test" ] || [ "$mode" = "--clean-test" ] || [ "$mode" = "--compile-git" ] || [ "$mode" = "--test-emulator" ]; then
+    require_tool clang
+  fi
+
   ensure_dir "$TMP_DIR"
   ensure_dir "$SDK_DIR"
   ensure_dir "$GRADLE_USER_HOME_DIR"
@@ -936,6 +951,7 @@ main() {
   log "NDK dir: $ANDROID_NDK_DIR"
   log "CMake dir: $ANDROID_CMAKE_DIR"
   log "To compile Git for host and Android ABIs: bash ./AndroidProjectTooling.sh --compile-git"
+  log "To compile Git only for Android ABIs: bash ./AndroidProjectTooling.sh --compile-android-git"
   log "To build without a background Gradle daemon: ./gradlew --no-daemon assembleDebug"
   log "To set up and build in one step: bash ./AndroidProjectTooling.sh --build"
   log "To set up and build a release AAB in one step: bash ./AndroidProjectTooling.sh --build-release-aab"