Strange `can't compile assets - 1` error on iOS due to missing simulator

[darronschall]

My build server runs ./gradlew iosSimulatorArm64Test as a GitHub action. When I added moko-resources into a new (almost empty) project, I started running into a strange can't compile assets - 1 that took a little while to debug. This error was not happening locally for me, just on the build server.

I'm not sure this is a moko-resources issue, but I'll document it here for future reference.

The error was:

> Task :shared:compileKotlinIosSimulatorArm64
can't compile assets - 1

FAILURE: Build failed with an exception.

> Task :shared:compileKotlinIosSimulatorArm64 FAILED
* What went wrong:
Execution failed for task ':shared:compileKotlinIosSimulatorArm64'.
> Assets compilation failed: 

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
> Get more help at https://help.gradle.org/./

... which I saw was coming from https://github.com/icerockdev/moko-resources/blob/590fc8f2eacbe5aca4992df83aa7473b[…]rock/gradle/generator/apple/action/PackResourcesToKLibAction.kt

After remoting into the server, I tried the command with debugging info: ./gradlew iosSimulatorArm64Test --debug --stacktrace

There was a lot of output, but this was the relevant part:

2024-04-23T11:17:11.252-0400 [ERROR] [org.gradle.api.Task] can't compile assets - 1
2024-04-23T11:17:11.252-0400 [INFO] [org.gradle.api.Task] <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
        <key>com.apple.actool.compilation-results</key>
        <dict>
                <key>output-files</key>
                <array/>
        </dict>
        <key>com.apple.actool.errors</key>
        <array>
                <dict>
                        <key>description</key>
                        <string>The operation couldn't be completed. Failed to locate any simulator runtime matching options: {
    BuildVersionString = 21E210;
    Platforms =     (
        "com.apple.platform.iphonesimulator"
    );
    VersionString = "17.4";
}</string>
                        <key>failure-reason</key>
                        <string>Failed to locate any simulator runtime matching options: {
    BuildVersionString = 21E210;
    Platforms =     (
        "com.apple.platform.iphonesimulator"
    );
    VersionString = "17.4";
}</string>
                </dict>
        </array>
</dict>
</plist>

That was able to point me in the right direction.

Running xcrun simctl list devices available showed that I had no 17.4 sims on the build server.

So, I tried to create one: xcrun simctl create "iPhone 15 (17.4)" "iPhone 15" iOS17.4 ... but that failed with: Invalid runtime: iOS17.4

Opening Xcode on the Mac mini and installing iOS 17.4 SDK, then creating a simulator, did the trick. (Previously, the highest SDK available I had installed on this particular Mac Mini build server was 17.2)

Again, what's interesting is that ./gradlew iosSimulatorArm64Test worked just fine before moko-resources was included in the project (the tests were run with one of the existing simulators).

The task only started failing because thexcrun actool Assets.xcassets --compile . --platform iphoneos --minimum-deployment-target 9.0 command was looking for the 17.4 simulator which wasn't installed... I'm not 100% sure why that is, or if there's something the moko-resources plugin can do to pick the same simulator as the multiplatform plugin to avoid erroring?

Anyway, I thought this was worth sharing. I'm not sure it's a bug... but it took a bit of digging to figure out so I wanted to share my findings here should anyone else encounter the same thing in the future. 👋

[Alex009]

@darronschall in 0.24.0 we now have iosMinimumDeploymentTarget property that passed in actool here

https://github.com/icerockdev/moko-resources/blob/d1afd653949f50e8a74de44aa934d89618418eab/resources-generator/src/main/kotlin/dev/icerock/gradle/actions/apple/PackAppleResourcesToKLibAction.kt#L105

so maybe you configure that minimum target is 17.4? in gradle

[Alex009]

@ExNDY here need to change info to error

https://github.com/icerockdev/moko-resources/blob/d1afd653949f50e8a74de44aa934d89618418eab/resources-generator/src/main/kotlin/dev/icerock/gradle/actions/apple/PackAppleResourcesToKLibAction.kt#L115

[ExNDY]

task.logger.info(input) changed in #674

[darronschall]

For this particular project, I have the iOS Deployment Target set in Xcode to 16.0. I'm not sure why actool was looking for a 17.4 sim... I couldn't find a 17.4 reference in any of the project source files.

[Alex009]

@darronschall i tell not about deployment target in xcode, but about iosMinimalDeploymentTarget in gradle configuration. did you change it?

[darronschall]

@Alex009 Ah, I see. No, I did not supply a value. I'm using a very minimal configuration:

multiplatformResources {
    resourcesPackage = "com.myapp.resources"
}