running flutter-gallery on rpi 3

[gmpbigsun]

Hey I was wondering if you could tell me how to run the gallery app on the raspberry pi

I followed the readme and setup everything to make the DRM version work.
The flutter-pi command itself is working however I'm not sure how to run the gallery-app

running "flutter-pi /usr/share/flutter-gallery/sony/data/flutter_assets leaves me with an error telling me that there's
no icutl.dat file inside /usr/share/flutter/

and running "flutter-pi /usr/share/flutter-gallery/sony/data/" tells me that there's no kernel.blob file inside "/usr/share/flutter-gallery/sony/data/" for debug mode

trying to run in release mode is telling me that there's no app.so inside the data folder

[Charlie9830]

Hi gmpbigsun.
I may be able to help.

By default, the flutter-gallery recipe installs the app bundle using the "Sony" layout. Which itself renames app.so to libapp.so and splits the bundle into a data/ and lib/ directory. This makes it compatible with the Sony embedders but unfortunately confuses flutter-pi.

To make this work for flutter-pi you can manually move libapp.so from the /lib directory over to the /data directory then rename it to app.so.
Then point flutter-pi to the data/ directory as it's target bundle directory.

A more permanent solution is to modify the flutter-gallery recipe (and any subsequent recipes you use for your own flutter apps). Specifically the compile and install steps, I've included the steps from my recipe below but I'll list the specific changes I made first.

• In do_compile() changed the --elf=libapp.so to --elf=app.so
• In do_install() disabled the Sony layout steps (I still plan to use the Sony embedders in the future)
• In do_install() I drop the sony subdirectory and instead just install app.so into a the flutter_assets directory.

With that done. At runtime I can run my app castboard-player with the following command.

flutter-pi --release /usr/share/castboard-player/flutter_assets

Recipe Changes

do_compile() {
    export PATH=${STAGING_DIR_NATIVE}/usr/share/flutter/sdk/bin:$PATH

    ENGINE_SDK=${S}/engine_sdk/sdk

    cd ${S}

    flutter build bundle
    dart ${ENGINE_SDK}/frontend_server.dart.snapshot --aot --tfa --target=flutter --sdk-root ${ENGINE_SDK} --output-dill app.dill lib/main.dart
    ${ENGINE_SDK}/clang_x64/gen_snapshot --deterministic --snapshot_kind=app-aot-elf --elf=app.so --strip app.dill
}

do_install() {

    #
    # Sony Layout
    #
    #install -d ${D}${datadir}/${PN}/sony
    #
    #install -d ${D}${datadir}/${PN}/sony/lib
    #install -m 644 ${S}/libapp.so ${D}${datadir}/${PN}/sony/lib
    #
    #install -d ${D}${datadir}/${PN}/sony/data
    #install -m 644 ${STAGING_DATADIR}/flutter/icudtl.dat ${D}${datadir}/${PN}/sony/data/
    #
    #install -d ${D}${datadir}/${PN}/sony/data/flutter_assets
    #cp -rTv ${S}/build/flutter_assets/. ${D}${datadir}/${PN}/sony/data/flutter_assets/


    #
    # Flutter-Pi Layout
    #
    install -d ${D}${datadir}/${PN}/
    
    install -d ${D}${datadir}/${PN}/flutter_assets/
    install -m 644 ${S}/app.so ${D}${datadir}/${PN}/flutter_assets/
    
    install -m 644 ${STAGING_DATADIR}/flutter/icudtl.dat ${D}${datadir}/${PN}/
    
    cp -r ${S}/build/flutter_assets/* ${D}${datadir}/${PN}/flutter_assets/
}

[gmpbigsun]

Hi gmpbigsun.
I may be able to help.

By default, the flutter-gallery recipe installs the app bundle using the "Sony" layout. Which itself renames app.so to libapp.so and splits the bundle into a data/ and lib/ directory. This makes it compatible with the Sony embedders but unfortunately confuses flutter-pi.

To make this work for flutter-pi you can manually move libapp.so from the /lib directory over to the /data directory then rename it to app.so.
Then point flutter-pi to the data/ directory as it's target bundle directory.

A more permanent solution is to modify the flutter-gallery recipe (and any subsequent recipes you use for your own flutter apps). Specifically the compile and install steps, I've included the steps from my recipe below but I'll list the specific changes I made first.

* In do_compile() changed the `--elf=libapp.so` to `--elf=app.so`

* In do_install() disabled the Sony layout steps (I still plan to use the Sony embedders in the future)

* In do_install() I drop the `sony` subdirectory and instead just install `app.so` into a the `flutter_assets` directory.

With that done. At runtime I can run my app castboard-player with the following command.

flutter-pi --release /usr/share/castboard-player/flutter_assets

Recipe Changes

do_compile() {
    export PATH=${STAGING_DIR_NATIVE}/usr/share/flutter/sdk/bin:$PATH

    ENGINE_SDK=${S}/engine_sdk/sdk

    cd ${S}

    flutter build bundle
    dart ${ENGINE_SDK}/frontend_server.dart.snapshot --aot --tfa --target=flutter --sdk-root ${ENGINE_SDK} --output-dill app.dill lib/main.dart
    ${ENGINE_SDK}/clang_x64/gen_snapshot --deterministic --snapshot_kind=app-aot-elf --elf=app.so --strip app.dill
}

do_install() {

    #
    # Sony Layout
    #
    #install -d ${D}${datadir}/${PN}/sony
    #
    #install -d ${D}${datadir}/${PN}/sony/lib
    #install -m 644 ${S}/libapp.so ${D}${datadir}/${PN}/sony/lib
    #
    #install -d ${D}${datadir}/${PN}/sony/data
    #install -m 644 ${STAGING_DATADIR}/flutter/icudtl.dat ${D}${datadir}/${PN}/sony/data/
    #
    #install -d ${D}${datadir}/${PN}/sony/data/flutter_assets
    #cp -rTv ${S}/build/flutter_assets/. ${D}${datadir}/${PN}/sony/data/flutter_assets/


    #
    # Flutter-Pi Layout
    #
    install -d ${D}${datadir}/${PN}/
    
    install -d ${D}${datadir}/${PN}/flutter_assets/
    install -m 644 ${S}/app.so ${D}${datadir}/${PN}/flutter_assets/
    
    install -m 644 ${STAGING_DATADIR}/flutter/icudtl.dat ${D}${datadir}/${PN}/
    
    cp -r ${S}/build/flutter_assets/* ${D}${datadir}/${PN}/flutter_assets/
}

Hey @Charlie9830
Thanks for the very helpful answer
That definitely explains why I wasn't able to do it.
Now it's working as intended.