Build and cache libtun2socks and libv2ray (#4167)

* build libtun2socks

* Clean up binaries

* test cache

altrepo for testing

* switch to original repo

.github/workflows/build.yml

@@ -13,42 +13,112 @@ jobs:
     - name: Checkout code
       uses: actions/checkout@v4
 
-    - name: Setup Java
-      uses: actions/setup-java@v4
+    - name: Prepare build dir
+      run: |
+        mkdir ${{ github.workspace }}/build
+
+    - name: Fetch AndroidLibV2rayLite
+      run: |
+        cd ${{ github.workspace }}/build
+        git clone --depth=1 -b master https://github.com/2dust/AndroidLibV2rayLite.git
+        cd AndroidLibV2rayLite
+        git submodule update --init
+
+    - name: Restore cached libtun2socks
+      id: cache-libtun2socks-restore
+      uses: actions/cache/restore@v4
       with:
-        distribution: 'temurin'
-        java-version: '21'
+        path: ${{ github.workspace }}/build/AndroidLibV2rayLite/libs
+        key: libtun2socks-${{ runner.os }}-${{ hashFiles('build/AndroidLibV2rayLite/.gitmodules') }}-${{ hashFiles('build/AndroidLibV2rayLite/.git/modules/badvpn/HEAD') }}-${{ hashFiles('build/AndroidLibV2rayLite/.git/modules/libancillary/HEAD') }}
+
+    - name: Setup Android NDK
+      if: steps.cache-libtun2socks-restore.outputs.cache-hit != 'true'
+      uses: nttld/setup-ndk@v1
+      id: setup-ndk
+      # Same version as https://gitlab.com/fdroid/fdroiddata/metadata/com.v2ray.ang.yml
+      with:
+        ndk-version: r27
+
+    - name: Build libtun2socks
+      if: steps.cache-libtun2socks-restore.outputs.cache-hit != 'true'
+      run: |
+        cd ${{ github.workspace }}/build/AndroidLibV2rayLite
+        bash compile-tun2socks.sh
+        tar -xvzf libtun2socks.so.tgz
+        cp -r libs/* ${{ github.workspace }}/V2rayNG/app/libs/
+      env:
+        NDK_HOME: ${{ steps.setup-ndk.outputs.ndk-path }}
+
+    - name: Save libtun2socks
+      if: steps.cache-libtun2socks-restore.outputs.cache-hit != 'true'
+      uses: actions/cache/save@v4
+      with:
+        path: ${{ github.workspace }}/build/AndroidLibV2rayLite/libs
+        key: libtun2socks-${{ runner.os }}-${{ hashFiles('build/AndroidLibV2rayLite/.gitmodules') }}-${{ hashFiles('build/AndroidLibV2rayLite/.git/modules/badvpn/HEAD') }}-${{ hashFiles('build/AndroidLibV2rayLite/.git/modules/libancillary/HEAD') }}
+
+    - name: Copy libtun2socks
+      run: |
+        cp -r ${{ github.workspace }}/build/AndroidLibV2rayLite/libs/* ${{ github.workspace }}/V2rayNG/app/libs/
+
+    - name: Fetch AndroidLibXrayLite
+      run: |
+        cd ${{ github.workspace }}/build
+        git clone --depth=1 -b main https://github.com/2dust/AndroidLibXrayLite.git
+
+    - name: Restore cached libv2ray
+      id: cache-libv2ray-restore
+      uses: actions/cache/restore@v4
+      with:
+        path: ${{ github.workspace }}/build/AndroidLibXrayLite/
+        key: libv2ray-${{ runner.os }}-${{ hashFiles('build/AndroidLibXrayLite/.git/refs/heads/main') }}
 
     - name: Setup Golang
+      if: steps.cache-libv2ray-restore.outputs.cache-hit != 'true'
       uses: actions/setup-go@v5
       with:
         go-version: '1.23.4'
         cache: false
 
     - name: Patch Go use 600296
+      if: steps.cache-libv2ray-restore.outputs.cache-hit != 'true'
       #https://go-review.googlesource.com/c/go/+/600296
       run: |
         cd "$(go env GOROOT)"
         curl "https://go-review.googlesource.com/changes/go~600296/revisions/5/patch" | base64 -d | patch --verbose -p 1
 
     - name: Install gomobile
+      if: steps.cache-libv2ray-restore.outputs.cache-hit != 'true'
       run: |
         go install golang.org/x/mobile/cmd/gomobile@v0.0.0-20240806205939-81131f6468ab
         echo "$(go env GOPATH)/bin" >> $GITHUB_PATH
 
-    - name: Setup Android environment
-      uses: android-actions/setup-android@v3
-
-    - name: Build dependencies
+    - name: Build libv2ray
+      if: steps.cache-libv2ray-restore.outputs.cache-hit != 'true'
       run: |
-        mkdir ${{ github.workspace }}/build
-        cd ${{ github.workspace }}/build
-        git clone --depth=1 -b main https://github.com/2dust/AndroidLibXrayLite.git
-        cd AndroidLibXrayLite
+        cd ${{ github.workspace }}/build/AndroidLibXrayLite
         gomobile init
         go mod tidy -v
         gomobile bind -v -androidapi 21 -ldflags='-s -w' ./
-        cp *.aar ${{ github.workspace }}/V2rayNG/app/libs/
+
+    - name: Save libv2ray
+      if: steps.cache-libv2ray-restore.outputs.cache-hit != 'true'
+      uses: actions/cache/save@v4
+      with:
+        path: ${{ github.workspace }}/build/AndroidLibXrayLite/
+        key: libv2ray-${{ runner.os }}-${{ hashFiles('build/AndroidLibXrayLite/.git/refs/heads/main') }}
+
+    - name: Copy libv2ray
+      run: |
+        cp -r ${{ github.workspace }}/build/AndroidLibXrayLite/*.aar ${{ github.workspace }}/V2rayNG/app/libs/
+
+    - name: Setup Java
+      uses: actions/setup-java@v4
+      with:
+        distribution: 'temurin'
+        java-version: '21'
+
+    - name: Setup Android environment
+      uses: android-actions/setup-android@v3
 
     - name: Decode Keystore
       uses: timheuer/base64-to-file@v1