Tested with the Numworks calculator v0100, Ubuntu 19.10. $ dpkg -l chromium-browser ... ii chromium-browser 77.0.3865.120-0ubuntu1.19.10.1 amd64 Transitional package - chromium-browser -> chromium snap $ snap changes ID Status Spawn Ready Summary 36 Done today at 10:20 CET today at 10:20 CET Refresh "chromium" snap from "candidate/raw-usb-test" channel $ snap interface raw-usb name: raw-usb summary: allows raw access to all USB devices slots: - core $ sudo snap connect chromium:raw-usb error: snap "chromium" has no plug named "raw-usb"
And without this connect, chrome://device-log/ says 'operation not permitted', as designed. At this point, the workaround of using chromium without a snap wrapper seems no longer available. The snap system knows something about raw- usb, but the chromium snap from the raw-usb-test channel does not want to connect to it. Let me know when you want further testing. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to chromium-browser in Ubuntu. https://bugs.launchpad.net/bugs/1780678 Title: [snap] Chromium cannot use WebUSB Status in chromium-browser package in Ubuntu: New Bug description: We're running into a weird bug on Ubuntu : WebUSB works on Chrome but doesn't on Chromium! Here's our udev rule: https://workshop.numworks.com/files/drivers/linux/50-numworks- calculator.rules It uses the uaccess tag which adds an ACL to the created file in /dev/ so that the current logged-in user has RW access to the corresponding /dev/bus/usb/** device. Apparently that's the way to go, since relying on groups is fragile (not all distros use the "plugdev" group for example). That udev rules works just fine. When using a command-line utility such as "dfu-tool", the USB device is seen and can be read from and written to. It also works just fine on Chrome. But Chromium gives us an "access denied" error. It lists the device, we do get the pop-up, but we cannot communicate. On Chromium, chrome://device-log says : Failed to open /dev/bus/usb/001/011: Operation not permitted (1) Here are the infos on said file: user@virtualbox:~$ ls -l /dev/bus/usb/001/011 crw-rw-r--+ 1 root root 189, 10 Jul 3 11:35 /dev/bus/usb/001/011 As you can see, the file is owned root/root, but has an ACL (as shown by the "+" symbol) user@virtualbox:~$ getfacl /dev/bus/usb/001/011 getfacl: Removing leading '/' from absolute path names # file: dev/bus/usb/001/011 # owner: root # group: root user::rw- user:user:rw- group::rw- mask::rw- other::r-- Here the ACL supposedely gives RW access to "user" who is indeed the current logged-in user, and the user running Chromium and Chrome. For reference : - Latest stable Ubuntu (18.04) - Using the Chromium that ships with Ubuntu (from the Ubuntu Software app. attached chrome://version page) - And using latest stable Chrome from google.com (attached chrome://version page) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bug/1780678/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
