Error: A runtime version is set in your AndroidManifest.xml, but is missing from your app.json/app.config.js

[km1chno]

Sometimes when running expo prebuild in project with android directory, we get the following error:

So far it has only been observed in CNG projects with android directory left as junk after build.

Quick remedy could be to

• evaluate whether project is CNG, like here: https://github.com/expo/expo/blob/ee198d023415c5d3e0f9ae9676f567badb48821d/packages/expo-updates/utils/src/workflow.ts
• run expo prebuild with flag --clean if it is CNG

It would be nice to understand exactly what the issue is though

[km1chno]

Steps to reproduce:

1. Set up expo project with app.json which has no runtimePolicy field and android/ directory in .gitignore.
2. Run setup-ci --preset --eas.
3. Run npx expo prebuild.
4. Run git reset --hard HEAD; git clean -df.
5. Run setup-ci --preset --eas again.
6. error occurs

Root cause

EAS Preview recipe patches app.json by adding

runtimeVersion: {
    policy: "fingerprint"
}

After that, npx expo prebuild (step 3) produces android/app/src/main/AndroidManifest.xml file with the following line:
<meta-data android:name="expo.modules.updates.EXPO_RUNTIME_VERSION" android:value="@string/expo_runtime_version"/>.
This line is added to AndroidManifest.xml by expo prebuild only if runtimeVersion is defined in app.json.

Then, if we reset app.json to original state (step 4.), and runtimeVersion field is removed), the android directory is not removed since it is listed in .gitignore and running npx expo prebuild again (as a subprocess of step 5) results in the error.

[km1chno]

I will close this with #120 as this seems like a very rare edge case that should not be handled by us.