129 lines
4.6 KiB
Nix
129 lines
4.6 KiB
Nix
{ config, lib, pkgs, utils, ... }:
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with lib;
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let
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bootFs = filterAttrs (n: fs: (fs.fsType == "bcachefs") && (utils.fsNeededForBoot fs)) config.fileSystems;
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commonFunctions = ''
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prompt() {
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local name="$1"
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printf "enter passphrase for $name: "
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}
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tryUnlock() {
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local name="$1"
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local path="$2"
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local success=false
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local target
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local uuid=$(echo -n $path | sed -e 's,UUID=\(.*\),\1,g')
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printf "waiting for device to appear $path"
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for try in $(seq 10); do
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if [ -e $path ]; then
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success=true
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break
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else
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target=$(blkid --uuid $uuid)
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if [ $? == 0 ]; then
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success=true
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break
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fi
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fi
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echo -n "."
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sleep 1
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done
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printf "\n"
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if [ $success == true ]; then
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path=$target
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fi
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if bcachefs unlock -c $path > /dev/null 2> /dev/null; then # test for encryption
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prompt $name
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until bcachefs unlock $path 2> /dev/null; do # repeat until successfully unlocked
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printf "unlocking failed!\n"
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prompt $name
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done
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printf "unlocking successful.\n"
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else
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echo "Cannot unlock device $uuid with path $path" >&2
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fi
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}
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'';
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# we need only unlock one device manually, and cannot pass multiple at once
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# remove this adaptation when bcachefs implements mounting by filesystem uuid
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# also, implement automatic waiting for the constituent devices when that happens
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# bcachefs does not support mounting devices with colons in the path, ergo we don't (see #49671)
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firstDevice = fs: head (splitString ":" fs.device);
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openCommand = name: fs: ''
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tryUnlock ${name} ${firstDevice fs}
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'';
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mkUnits = prefix: name: fs: let
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mountUnit = "${utils.escapeSystemdPath (prefix + (lib.removeSuffix "/" fs.mountPoint))}.mount";
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device = firstDevice fs;
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deviceUnit = "${utils.escapeSystemdPath device}.device";
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in {
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name = "unlock-bcachefs-${utils.escapeSystemdPath fs.mountPoint}";
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value = {
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description = "Unlock bcachefs for ${fs.mountPoint}";
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requiredBy = [ mountUnit ];
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before = [ mountUnit ];
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bindsTo = [ deviceUnit ];
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after = [ deviceUnit ];
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unitConfig.DefaultDependencies = false;
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serviceConfig = {
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Type = "oneshot";
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ExecCondition = "${pkgs.bcachefs-tools}/bin/bcachefs unlock -c \"${device}\"";
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Restart = "on-failure";
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RestartMode = "direct";
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# Ideally, this service would lock the key on stop.
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# As is, RemainAfterExit doesn't accomplish anything.
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RemainAfterExit = true;
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};
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script = ''
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${config.boot.initrd.systemd.package}/bin/systemd-ask-password --timeout=0 "enter passphrase for ${name}" | exec ${pkgs.bcachefs-tools}/bin/bcachefs unlock "${device}"
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'';
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};
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};
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in
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{
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config = mkIf (elem "bcachefs" config.boot.supportedFilesystems) (mkMerge [
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{
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# needed for systemd-remount-fs
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system.fsPackages = [ pkgs.bcachefs-tools ];
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# use kernel package with bcachefs support until it's in mainline
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# TODO replace with requireKernelConfig
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boot.kernelPackages = pkgs.linuxPackages_testing_bcachefs;
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systemd.services = lib.mapAttrs' (mkUnits "") (lib.filterAttrs (n: fs: (fs.fsType == "bcachefs") && (!utils.fsNeededForBoot fs)) config.fileSystems);
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}
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(mkIf ((elem "bcachefs" config.boot.initrd.supportedFilesystems) || (bootFs != {})) {
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# chacha20 and poly1305 are required only for decryption attempts
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boot.initrd.availableKernelModules = [ "bcachefs" "sha256" "chacha20" "poly1305" ];
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boot.initrd.systemd.extraBin = {
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# do we need this? boot/systemd.nix:566 & boot/systemd/initrd.nix:357
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"bcachefs" = "${pkgs.bcachefs-tools}/bin/bcachefs";
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"mount.bcachefs" = "${pkgs.bcachefs-tools}/bin/mount.bcachefs";
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};
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boot.initrd.extraUtilsCommands = lib.mkIf (!config.boot.initrd.systemd.enable) ''
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copy_bin_and_libs ${pkgs.bcachefs-tools}/bin/bcachefs
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copy_bin_and_libs ${pkgs.bcachefs-tools}/bin/mount.bcachefs
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'';
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boot.initrd.extraUtilsCommandsTest = lib.mkIf (!config.boot.initrd.systemd.enable) ''
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$out/bin/bcachefs version
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'';
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boot.initrd.postDeviceCommands = lib.mkIf (!config.boot.initrd.systemd.enable) (commonFunctions + concatStrings (mapAttrsToList openCommand bootFs));
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boot.initrd.systemd.services = lib.mapAttrs' (mkUnits "/sysroot") bootFs;
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})
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]);
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}
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