Cannot allow to specify not to download native-image component

[linghengqian]

• I noticed that in https://github.com/graalvm/graalvm-jdk-downloader/actions/runs/4018232570/jobs/6903673688, the bash command actively downloaded native-image component without specifying -c native-image .
• I verified this behavior in Dockerfile, if we execute bash <(curl -sL https://get.graalvm.org/jdk) -c espresso graalvm-ce-java17-22.3.1, it will not only download espresso component, also downloads the native-image component.
• 
• This comes from my investigation of Make ShardingSphere Proxy in GraalVM Native Image form available apache/shardingsphere#21347. Since Truffle Espresso is used when packaging the GraalVM Native Image of Apache ShardingSphere Proxy, and Native image + espresso, espressoHome not defined & internal GraalVM error oracle/graal#4555 has not been closed, I must pass bash <(curl -sL https:/ /get.graalvm.org/jdk) -c espresso graalvm-ce-java17-22.3.1 to explicitly download the Espresso files. It would be nice if the bash command had a way to prevent the download of the native-image component. This reduces the size of the final Docker Image because the GraalVM Native Image binary is compiled before starting to package the Docker Image.

[fniephaus]

Thanks for raising this issue, @linghengqian. As you found out, native-image is always installed by default and we do not have any plans to change this.

This reduces the size of the final Docker Image because the GraalVM Native Image binary is compiled before starting to package the Docker Image.

I'm not sure I understand: If you build the application with Native Image and Espresso, you no longer need a full GraalVM installation when deploying the application. Are you sure you need a GraalVM installation in your Docker container?

[linghengqian]

• I have tested to run GraalVM Native Image within Truffle Espresso, and it does not require a full installation of GraalVM CE, but requires a common JVM and Truffle Espresso specific files, and Espresso files must be located in $GRAALVM_HOME/languages/java, This is the weirdest bit that I think Native image + espresso, espressoHome not defined & internal GraalVM error oracle/graal#4555 brings up. In my understanding, if I don't install GraalVM CE, downloading Espresso files is a matter of not knowing where to start.

• Native image + espresso, espressoHome not defined & internal GraalVM error oracle/graal#4555 behaves like this on GraalVM CE 22.3.1, am I understanding something wrong?

[fniephaus]

Right, I believe fixing oracle/graal#4555 is the right thing to do here. Until then, your containers may be a bit bigger. As a workaround, you could gu remove native-image again, right after using the GraalVM JDK downloader scripts.

I hope you don't mind if I'm closing this for now.

[linghengqian]

• Thanks, I will use gu remove command in Dockerfile.