The TAG+="uaccess" has no effect in the udev rule

[wucke13]

As hinted here, udev uaccess is granted by /usr/lib/udev/rules.d/73-seat-late.rules. So having a rule add the uaccess tag after 73-seat-late.rules ran has not effect. The rules are ran in lexical order, so to be compatible with the uacccess system, the rule must be renamed, i.e. to 70-CH341.rules.

IMSProg/IMSProg_programmer/other/99-CH341.rules

Line 3 in 062b2f0

SUBSYSTEM=="usb", ATTRS{idVendor}=="1a86", ATTRS{idProduct}=="5512", MODE="0660", GROUP="plugdev", TAG+="uaccess"

[bigbigmdm]

@wucke13 , GROUP=‘plugdev’ is not enough for the current user to get permissions?

[wucke13]

It is, on distros that use the plugdev group menchanism. Udev's uaccess is a completely orthogonal mechanism to provide access: essentially, for each device that was tagged uaccess, in 73-seat-late.rules an internal function of udev is called to grant access to all users that have a local seat.

The mechanism is widely used, but unfortunately under-documented, as pointed out in systemd/systemd#4288. However, many distros consider deprecating plugdev and instead moving to uaccess as the cleaner approach, i.e. as mentioned in the archwiki: https://wiki.archlinux.org/title/Udev#Allowing_regular_users_to_use_devices

[bigbigmdm]

@Fantu , may I have your opinion on this? (Pull request)

[wucke13]

Fixed by 947320f