Fix the workspace build off-device
Two breaks that only appeared on a full `cargo test --workspace`. `slint::android` exists only when compiling for Android, so darkroom-android failed to compile on the host even though it is a workspace member. The entry point is now gated on the target rather than on a feature. The timeline forwarded `scrub` where the Timeline component declares `scrub-to`, which the Slint compiler rejects. Assisted-by: LLM
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#!/usr/bin/env bash
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# Build DarkRoom into an installable APK, without Gradle.
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#
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# ./docker/android/package.sh # build + package, debug-signed
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# ./docker/android/package.sh --install # ...and adb install to a device
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#
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# Gradle would add a second build system, a second dependency tree, and a
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# second place for the toolchain versions to drift out of step with the
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# Dockerfile. The four tools it would have driven — aapt2, d8, zipalign,
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# apksigner — are in build-tools already and are enough on their own, because
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# the app has no Java of its own: android-activity's glue calls android_main
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# directly, and the only classes in the APK are the ones Slint's build script
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# compiles for its own helper.
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set -euo pipefail
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HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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REPO="$(cd "${HERE}/../.." && pwd)"
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ABI="arm64-v8a"
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RUST_TARGET="aarch64-linux-android"
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PKG_DIR="${REPO}/apps/darkroom-android/android"
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# The container writes here (see build.sh); the APK is assembled in the same
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# place so both halves of the build agree on one output directory.
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CACHE="${XDG_CACHE_HOME:-${HOME}/.cache}/darkroom-android"
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OUT="${CACHE}/apk"
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APK="${OUT}/darkroom.apk"
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INSTALL=0
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[[ "${1:-}" == "--install" ]] && INSTALL=1
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# ---------------------------------------------------------------------------
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# 1. Cross-compile the shared library.
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# ---------------------------------------------------------------------------
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echo "==> building libdarkroom.so (${ABI})"
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"${HERE}/build.sh" cargo ndk -t "${ABI}" -o /work/target-android/jniLibs \
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build --release -p darkroom-android
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SO="${CACHE}/target/jniLibs/${ABI}/libdarkroom.so"
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[[ -f "${SO}" ]] || { echo "error: ${SO} not built" >&2; exit 1; }
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# ---------------------------------------------------------------------------
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# 2. Assemble the APK inside the container, where the SDK lives.
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#
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# Everything below runs in one container invocation: aapt2 link produces a base
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# APK with the manifest, then the .so and Slint's dex are added as stored
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# entries, then zipalign and apksigner finish it. The .so is stored rather than
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# deflated so Android can mmap it directly (extractNativeLibs=false territory);
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# for a 37 MB library that also keeps install times sane.
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# ---------------------------------------------------------------------------
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echo "==> packaging APK"
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"${HERE}/build.sh" bash -euo pipefail -c '
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SDK=/opt/android-sdk
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BT="${SDK}/build-tools/36.0.0"
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ABI="'"${ABI}"'"
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RT="'"${RUST_TARGET}"'"
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OUT=/work/target-android/apk
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rm -rf "${OUT}" && mkdir -p "${OUT}/staging/lib/${ABI}"
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# Slint compiles a Java helper (SlintAndroidJavaHelper) in its build script
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# and dexes it. The build-dir hash changes whenever its inputs change, so
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# find it rather than hard-coding a path; the newest wins if stale
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# directories from earlier builds are still around.
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DEX="$(find "/work/target-android/${RT}/release/build" \
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-path "*i-slint-backend-android-activity*/out/classes.dex" \
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-printf "%T@ %p\n" 2>/dev/null | sort -rn | head -1 | cut -d" " -f2-)"
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if [[ -z "${DEX}" ]]; then
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echo "error: Slint classes.dex not found — did the backend build?" >&2
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exit 1
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fi
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echo " dex: ${DEX}"
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# A debug keystore, created once and kept in the cache. Debug-signed only:
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# this exists to get the app onto a test device, not to release it.
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KS=/work/target-android/debug.keystore
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if [[ ! -f "${KS}" ]]; then
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echo " generating debug keystore"
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keytool -genkeypair -keystore "${KS}" -alias androiddebugkey \
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-storepass android -keypass android \
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-keyalg RSA -keysize 2048 -validity 10950 \
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-dname "CN=Android Debug,O=Android,C=US" >/dev/null 2>&1
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fi
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# aapt2 link needs the compile SDK to resolve android: attributes, and
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# --min-sdk-version is what ends up in the manifest the device reads.
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"${BT}/aapt2" link \
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-I "${SDK}/platforms/android-36/android.jar" \
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--manifest /work/apps/darkroom-android/android/AndroidManifest.xml \
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--min-sdk-version 28 \
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--target-sdk-version 36 \
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-o "${OUT}/base.apk" \
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--auto-add-overlay
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cp "/work/target-android/jniLibs/${ABI}/libdarkroom.so" \
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"${OUT}/staging/lib/${ABI}/libdarkroom.so"
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cp "${DEX}" "${OUT}/staging/classes.dex"
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# -0 "" stores without compression; see the note above about mmap.
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cd "${OUT}/staging"
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cp "${OUT}/base.apk" "${OUT}/unaligned.apk"
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zip -q -0 -X "${OUT}/unaligned.apk" "lib/${ABI}/libdarkroom.so"
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zip -q -X "${OUT}/unaligned.apk" classes.dex
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# zipalign before signing: apksigner preserves alignment, the reverse order
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# invalidates the signature.
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"${BT}/zipalign" -p -f 4 "${OUT}/unaligned.apk" "${OUT}/darkroom.apk"
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"${BT}/apksigner" sign \
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--ks "${KS}" --ks-pass pass:android --key-pass pass:android \
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--min-sdk-version 28 \
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"${OUT}/darkroom.apk"
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"${BT}/apksigner" verify --print-certs "${OUT}/darkroom.apk" | head -2
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'
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echo "==> ${APK}"
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ls -la "${APK}"
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# ---------------------------------------------------------------------------
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# 3. Install from the host.
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#
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# The container has adb but no device: build.sh mounts no USB and shares no
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# network, so the host's already-authorised adb server is the shorter path.
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# ---------------------------------------------------------------------------
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if [[ "${INSTALL}" == "1" ]]; then
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command -v adb >/dev/null || { echo "error: adb not on PATH" >&2; exit 1; }
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echo "==> installing"
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adb install -r "${APK}"
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echo "==> launching"
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adb shell am start -n paris.tourolle.darkroom/android.app.NativeActivity
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fi
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