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Add udev rules for Ledger devices #39950

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Add udev rules for Ledger devices #39950

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chris-martin
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@chris-martin chris-martin commented May 3, 2018 •
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This adds udev rules for Ledget wallets, allowing you to use a Ledger device by adding hardware.ledger.enable = true; to your NixOS config.

The source file is a bash script at https://github.com/LedgerHQ/udev-rules/blob/master/add_udev_rules.sh and I made the ledger-udev-rule package by applying some replacements with sed. The rules file ends up looks like this:

lib/udev/rules.d/20-ledger.rules

SUBSYSTEMS=="usb", ATTRS{idVendor}=="2581", ATTRS{idProduct}=="1b7c",  TAG+="uaccess"
SUBSYSTEMS=="usb", ATTRS{idVendor}=="2581", ATTRS{idProduct}=="2b7c",  TAG+="uaccess"
SUBSYSTEMS=="usb", ATTRS{idVendor}=="2581", ATTRS{idProduct}=="3b7c",  TAG+="uaccess"
SUBSYSTEMS=="usb", ATTRS{idVendor}=="2581", ATTRS{idProduct}=="4b7c",  TAG+="uaccess"
SUBSYSTEMS=="usb", ATTRS{idVendor}=="2581", ATTRS{idProduct}=="1807",  TAG+="uaccess"
SUBSYSTEMS=="usb", ATTRS{idVendor}=="2581", ATTRS{idProduct}=="1808",  TAG+="uaccess"
SUBSYSTEMS=="usb", ATTRS{idVendor}=="2c97", ATTRS{idProduct}=="0000",  TAG+="uaccess"
SUBSYSTEMS=="usb", ATTRS{idVendor}=="2c97", ATTRS{idProduct}=="0001",  TAG+="uaccess"

jtojnar
jtojnar reviewed May 3, 2018
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nixos/doc/manual/release-notes/rl-1809.xml Outdated
</listitem>
<listitem>
<para>
<literal>./services/hardware/ledger.nix</literal>
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I think this section is usually auto-generated before release.

pkgs/os-specific/linux/ledger-udev-rules/default.nix

installPhase = ''
mkdir --parents "$out/lib/udev/rules.d"
cat add_udev_rules.sh | grep echo | sed "s_/etc_$out/lib_" | sed "s_hw1_ledger_" | sed 's_MODE=\\"0660\\",__' | sed 's_GROUP=\\"plugdev\\"_TAG+=\\"uaccess\\"_' > install.sh
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Could you maybe ask upstream to provide the rules in a separate file?

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I'll try.

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Submitted LedgerHQ/udev-rules#1 upstream.

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Could we just embed these rules? The other key modules does it as well.

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I did it this way because I was trying to follow the example of an existing package (libu2f-host), but I don't have an opinion. I'd be happy to amend the PR to embed the rules if that's preferable.

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@jtojnar jtojnar May 4, 2018 •
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I think the script is preferable – since upstream does not provide the rules file, we would need to convert the add_udev_rules.sh file with each update anyway.

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I doubt that script is likely to be stable enough for my sed nonsense to remain reliable, so I think it's a wash.

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It got merged!

@chris-martin chris-martin mentioned this pull request May 3, 2018
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@CMCDragonkai CMCDragonkai mentioned this pull request May 4, 2018
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For some reason, trying out your rules on my NixOS doesn't work. It only works if I explicitly set OWNER="cmcdragonkai". I monitor the udevadm, and it shows that it adds the device, and everything else is correct, but the Ledger Manager is just stuck. If I add the owner rule, everything just works.

Is there something that's meant to happen with uaccess that requires a prompt or something? I'm not running a normal DE, I'm running XMonad if that helps.

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Should we add udev-acl as well?

@rehno-lindeque
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Should we add udev-acl as well?

I don't think so, I believe udev-acl doesn't exist anymore.

@rehno-lindeque
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For some reason, trying out your rules on my NixOS doesn't work. It only works if I explicitly set OWNER="cmcdragonkai".

Possibly getfacl /dev/hidraw* could help debug. (Should be able to see user:cmcdragonkai:rw-?)

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asymmetric commented Feb 10, 2019 •
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@CMCDragonkai's addition was necessary for this to work in my case too, and I use i3. @chris-martin maybe OWNER should be added in this module?

EDIT: The uaccess tag only works if the rule is sourced in a file with id < 73, so that explains why it wasn't working when added to extraRules (which appends to a 99- file).

@asymmetric asymmetric mentioned this pull request Feb 14, 2019
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6.topic: nixos 8.has: module (update) 8.has: package (new) 10.rebuild-darwin: 0 10.rebuild-linux: 1-10
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@chris-martin @CMCDragonkai @rehno-lindeque @asymmetric @jtojnar @GrahamcOfBorg