Expose Finch features to Crosh and other Chrome OS processes

[Tim Zheng]

Is there a recommended way to share Finch features to Crosh? D-Bus or mojo or something else?

Thank you

Tim

[Mike Frysinger]

backing up, who is managing the finch database ?  is it all under Chrome ?  if so, dbus is preferable.  then again, if it's in Chrome, doesn't it already have a chrome:// page for it so crosh wouldn't be needed ?

-mike

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[Scott Violet]

Finch state is held by Chrome. I'm not sure what system you need this for, but it's entirely possible Chrome isn't running at the time you would need the information.

  -Scott

[Mike Frysinger]

we have the same issue with the policy db and proxy info, so i think we have precedence to refer to

-mike

[Tim Zheng 鄭雲生]

Currently I have 2 places that need to check this value. 1) A program that's invoked within crosh 2) The app list UI. Is Chrome possible to be not running while the app list is? How is it addressed with policy db and proxy info?

[Tim Zheng 鄭雲生]

+Jeffrey Kardatzke

[Zelidrag Hornung]

Nope - Chrome is always running right now and app list UI is served from it.

You probably just want to pass new command line switches derived from Finch values to the process underneath Crosh.

[Mike Frysinger]

if Chrome had a dbus end point to query Finch experiments, that'd be feasible.  another option would be to have the program itself do the query and change its (default) behavior.  that might be preferable as we like to keep crosh light (due to its shell script nature).

-mike

[Tim Zheng 鄭雲生]

Hi Mike,

Is it possible to pass in a command line parameter to crosh from chrome when crosh is started? I'm thinking I might want to remove this particular crosh command depending on this parameter. Is this considered a clean approach? Can you give me an example if this is regularly done? Or is querying a D-Bus interface a more preferred approach?

Thanks

Tim

[Mike Frysinger]

crosh is spawned from Chrome, so it could change the flags it passes, but i don't think that's the route we want to go.  the images are all public so people can still see the commands.  it'd also complicate the code.  we already have commands in crosh that aren't available on all devices, and crosh is a developer tool, so shouldn't be a problem to have one say "this is unavailable".

-mike