STR: 0. Enable USB Sharing with UMS Expected: The sdcard is exported via UMS Actual: Nothing happens

We first need to add "mass_storage" to |persist.sys.usb.config|. Then I have the feature working (a /dev/sdb is exposed to the computer) but it's not sharing anything.

(In reply to Alexandre LISSY :gerard-majax from comment #1) > We first need to add "mass_storage" to |persist.sys.usb.config|. Then I have > the feature working (a /dev/sdb is exposed to the computer) but it's not > sharing anything. And that works. My profile comes from previous devices. Code from AutoMounterSetting checks against the Settings API whether we have a specific volume allowed for UMS. This is being checked at https://hg.mozilla.org/mozilla-central/annotate/ab0490972e1e/dom/system/gonk/AutoMounterSetting.cpp#l265 So it turns out my device previously had volumes named "sdcard", "extsdcard" and "external", while my new one has "sdcard", "sdcard1" and "usbdisk". So of course, the settings were: - ums.volume.sdcard.enabled: true - ums.volume.extsdcard.enabled: true - ums.volume.external.enabled: true While it should have been: - ums.volume.sdcard.enabled: true - ums.volume.sdcard1.enabled: true - ums.volume.usbdisk.enabled: true Once this is fixed, and with the appropriate persist value, then USB Mass Storage works. Only for the "sdcard1" volume of course.

Should we also treat this as a migration issue? All my devices where I put a profile coming from a previous device expose the same issue: they lack the settings keys.

This is further complicated by the fact that you used to be able to set the individual volume controls in the settings app, but this was removed a while back. I think that a reasonable way forward is that the preference should default to true if it doesn't exist.

Comment on attachment 8589059 [details] Shinano common PR Looks good to me.