optimized android build in docker

Author: andre-dietrich

Dockerfile

@@ -64,20 +64,23 @@ COPY package.json package-lock.json* ./
 RUN npm ci --omit=dev
 
 # Pre-cache Capacitor dependencies for Android builds
-RUN mkdir -p /tmp/capacitor-cache && \
-    cd /tmp/capacitor-cache && \
+RUN mkdir -p dist/capacitor-cache && \
+    cd dist/capacitor-cache && \
     echo '{"dependencies":{"@capacitor/cli":"^8.0.0","@capacitor-community/text-to-speech":"git+https://github.com/capacitor-community/text-to-speech.git#v8.0.0","@capacitor/android":"^8.0.0","@capacitor/assets":"^3.0.5","@capacitor/core":"^8.0.0"}}' > package.json && \
     npm install && \
-    cd / && \
-    rm -rf /tmp/capacitor-cache
+    echo "import type { CapacitorConfig } from '@capacitor/cli'; const config: CapacitorConfig = { appId: 'io.liascript.course', appName: 'App', webDir: 'www' }; export default config;" > capacitor.config.ts && \
+    mkdir -p www && \
+    touch www/index.html && \
+    npx cap add android && \
+    cd android && \
+    ./gradlew && \
+    cd .. && \
+    rm -rf www android capacitor.config.ts && \
+    cd ..
 
 # Copy the dist folder
 COPY dist/ ./dist/
 
-# Create symlink for server public folder at expected path
-RUN mkdir -p /app/liascript-exporter/server && \
-    ln -s /app/dist/server/public /app/liascript-exporter/server/public
-
 # Install Puppeteer's Chrome explicitly
 RUN npx puppeteer browsers install chrome
 

src/export/android.ts

@@ -110,9 +110,16 @@ export async function exporter(argument: AndroidExportArguments, json: any) {
     })
   }
 
-  await helper.writeFile(
-    path.join(tmp, 'package.json'),
-    `{
+  let capacitorCachePath = path.join(dirname, './capacitor-cache')
+  if (fs.existsSync(capacitorCachePath)) {
+    console.log('Using cached Capacitor dependencies for Android export')
+    await fs.copy(capacitorCachePath, tmp)
+  } else {
+    capacitorCachePath = null
+
+    await helper.writeFile(
+      path.join(tmp, 'package.json'),
+      `{
     "scripts": {
       "build": "npx cap sync android"
     },
@@ -127,7 +134,8 @@ export async function exporter(argument: AndroidExportArguments, json: any) {
       "node": ">= 12"
     }
   }`,
-  )
+    )
+  }
 
   await helper.writeFile(
     path.join(tmp, 'capacitor.config.ts'),
@@ -170,7 +178,9 @@ export default config`,
 
   execute(
     [
-      'npm i',
+      capacitorCachePath
+        ? 'echo "Using cached Capacitor dependencies"'
+        : 'npm i',
       'npx cap add android',
       'npx cap sync',
       `npx @capacitor/assets generate --iconBackgroundColor '${argument['android-iconBackgroundColor'] || '#bbbbbb'}' --iconBackgroundColorDark '${argument['android-iconBackgroundColorDark'] || '#555555'}'`,