ci(nc-android): fix gradle build

.github/workflows/nc-android-apk.yml

@@ -33,6 +33,9 @@ jobs:
           libayatana-appindicator3-dev \
           librsvg2-dev
 
+      - name: Checkout
+        uses: actions/checkout@v3
+
       - name: Install Java
         uses: actions/setup-java@v3
         with:
@@ -57,11 +60,6 @@ jobs:
             "ndk;$NDK_VERSION" \
             "build-tools;$SDK_BUILDTOOLS_VERSION"
 
-      - name: Debug
-        run: |
-          echo $ANDROID_HOME
-          ls -la $ANDROID_HOME
-
       - name: Install Rust toolchain
         uses: dtolnay/rust-toolchain@stable
 
@@ -82,9 +80,6 @@ jobs:
           npm i -g yarn
           yarn --version
 
-      - name: Checkout
-        uses: actions/checkout@v3
-
       - name: Build frontend code
         run: |
           yarn install --frozen-lockfile
@@ -94,8 +89,10 @@ jobs:
       - name: Build APK
         working-directory: nym-connect-android
         env:
+          ANDROID_SDK_ROOT: ${{ env.ANDROID_HOME }}
           WRY_ANDROID_PACKAGE: net.nymtech.nym_connect_android
           WRY_ANDROID_LIBRARY: nym_connect_android
+          NODE_BIN_PATH: ${{ github.workspace }}/nym-connect-android/node_modules/.bin
         # TODO build with release profile (--release), it will requires
         # to sign the APK. For now build with debug profile to avoid that
         run: yarn tauri android build --debug --apk --split-per-abi

nym-connect-android/src-tauri/gen/android/nym_connect_android/buildSrc/src/main/java/net/nymtech/nym_connect_android/kotlin/BuildTask.kt

@@ -14,8 +14,10 @@ open class BuildTask : DefaultTask() {
     @InputDirectory
     @PathSensitive(PathSensitivity.RELATIVE)
     var rootDirRel: File? = null
+
     @Input
     var target: String? = null
+
     @Input
     var release: Boolean? = null
 
@@ -25,12 +27,20 @@ open class BuildTask : DefaultTask() {
         val target = target ?: throw GradleException("target cannot be null")
         val release = release ?: throw GradleException("release cannot be null")
         val home = (System.getenv("HOME") ?: "")
-        val cargo_home = (System.getenv("CARGO_HOME") ?: "$home/.cargo")
-        println("gradle Rust plugin: CARGO_HOME $cargo_home")
+        val nodeBinPath = (System.getenv("NODE_BIN_PATH") ?: "")
+        val cargoHome = (System.getenv("CARGO_HOME") ?: "$home/.cargo")
+        val cargoExecutable = "$cargoHome/bin/cargo-tauri";
+        val nodeExecutable = "$nodeBinPath/tauri";
+        val tauriCli = when {
+            File(cargoExecutable).isFile() -> cargoExecutable
+            File(nodeExecutable).isFile() -> nodeExecutable
+            else -> throw GradleException("couldn't find tauri-cli executable")
+        }
+        println("gradle Rust plugin, using tauri cli executable: $tauriCli")
         project.exec {
             workingDir(File(project.projectDir, rootDirRel.path))
-            executable("""$cargo_home/bin/cargo-tauri""")
-            args(listOf("tauri", "android", "android-studio-script"))
+            executable(tauriCli)
+            args(listOf("android", "android-studio-script"))
             if (project.logger.isEnabled(LogLevel.DEBUG)) {
                 args("-vv")
             } else if (project.logger.isEnabled(LogLevel.INFO)) {