platforms/android-23/core-for-system-modules.jar missing

[tholenst]

I'm trying to build my library for Android using Bazel, and depending on the way I install the SDK things fail.

For this issue, we using bzlmod.

To reproduce, I first install the SDK in /tmp/core-for-system-modules-repro/

rm -rf /tmp/core-for-system-modules-repro
mkdir /tmp/core-for-system-modules-repro
cd /tmp/core-for-system-modules-repro
mkdir sdk_with_23/
mkdir sdk_with_30/
mkdir sdk_with_23_and_30

wget https://dl.google.com/android/repository/commandlinetools-linux-8512546_latest.zip
unzip commandlinetools-linux-8512546_latest.zip

yes | cmdline-tools/bin/sdkmanager --sdk_root=/tmp/core-for-system-modules-repro/sdk_with_23/           "build-tools;30.0.3" "platform-tools" "platforms;android-23"
yes | cmdline-tools/bin/sdkmanager --sdk_root=/tmp/core-for-system-modules-repro/sdk_with_23_and_30/    "build-tools;30.0.3" "platform-tools" "platforms;android-23" "platforms;android-30"
yes | cmdline-tools/bin/sdkmanager --sdk_root=/tmp/core-for-system-modules-repro/sdk_with_30/           "build-tools;30.0.3" "platform-tools" "platforms;android-30"

We then create MODULE.bazel and .bazelversion:

cat > MODULE.bazel <<EOF
bazel_dep(name = "rules_java", version = "7.11.1")
bazel_dep(name = "bazel_skylib", version = "1.3.0")

bazel_dep(name = "rules_android", version = "0.6.6")

remote_android_extensions = use_extension(
    "@rules_android//bzlmod_extensions:android_extensions.bzl",
    "remote_android_tools_extensions")
use_repo(remote_android_extensions, "android_tools")

android_sdk_repository_extension = use_extension("@rules_android//rules/android_sdk_repository:rule.bzl", "android_sdk_repository_extension")
use_repo(android_sdk_repository_extension, "androidsdk")
android_sdk_repository_extension.configure(build_tools_version = "30.0.3", api_level = 30, path="/tmp/core-for-system-modules-repro/sdk")

register_toolchains("@androidsdk//:sdk-toolchain", "@androidsdk//:all")
EOF


cat > .bazelversion <<EOF
8.4.1
EOF

Building with sdk_with_30 works:

cp -r sdk_with_30 sdk
bazel clean; bazel build @rules_android//:androidsdk_files

(INFO: Build completed successfully, 1 total action)

However, building with sdk_with_23_and_30 doesn't work:

rm -rf sdk; cp -r sdk_with_23_and_30 sdk
bazel clean; bazel build @rules_android//:androidsdk_files

ERROR: /home/tholenst/.cache/bazel/_bazel_tholenst/8459a255b91a183168e554695f792479/external/rules_android++android_sdk_repository_extension+androidsdk/BUILD.bazel:57:25: @@rules_android+//:androidsdk_files: missing input file '@@rules_android++android_sdk_repository_extension+androidsdk//:platforms/android-23/core-for-system-modules.jar'

This is a bit weird to me since I'm even selecting for api_level 30. It might be that I'm misunderstanding something, however.

I'd also like to build my library with api_level 23 only.