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debloat initrd (ZFS-related)

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Niklas Gollenstede 2023-08-12 17:20:06 +02:00
parent c59ecbba02
commit 41c75410e1
3 changed files with 13 additions and 7 deletions
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1
.vscode/settings.json vendored
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@ -123,6 +123,7 @@
"nounset", // bash
"ntfs", // filesystem
"oneshot", // systemd
"openssh", // package
"optimise", // B/E
"ostype", // virtual box
"overlayed", // word

2
lib/setup-scripts/zfs.sh
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@ -36,7 +36,7 @@ function create-zpool {
fi
done
@{native.kmod}/bin/modprobe zfs || true
<$keySrc @{native.xxd}/bin/xxd -l 32 -c 64 -p | ( PATH=@{native.zfs}/bin ; ${_set_x:-:} ; zpool create ${args[zpool-force]:+-f} "${zpoolCreate[@]}" -R "$mnt" "${pool[name]}" "${vdevs[@]}" ) || return
{ <$keySrc tr -dc 0-9a-f || true ; } | head -c 64 | ( PATH=@{native.zfs}/bin ; ${_set_x:-:} ; zpool create ${args[zpool-force]:+-f} "${zpoolCreate[@]}" -R "$mnt" "${pool[name]}" "${vdevs[@]}" ) || return
prepend_trap "@{native.zfs}/bin/zpool export '$poolName'" EXIT || return
if [[ $keySrc == /dev/urandom ]] ; then @{native.zfs}/bin/zfs unload-key "$poolName" &>/dev/null ; fi

17
modules/setup/zfs.nix.md
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@ -156,29 +156,34 @@ in let module = {
anyPool = filterBy: lib.any (pool: pool.${filterBy}) (lib.attrValues cfg.pools);
poolNames = filterBy: lib.attrNames (lib.filterAttrs (name: pool: pool.${filterBy}) cfg.pools);
filter = pool: "^${pool}($|[/])";
ensure-datasets = zfsPackage: pkgs.writeShellScript "ensure-datasets" ''
ensure-datasets = zfsPackage: extraUtils: pkgs.writeScript "ensure-datasets" ''
#!${pkgs.pkgsStatic.bash}/bin/bash
set -o pipefail -o nounset ; declare-command () { : ; } ; declare-flag () { : ; } ;
${lib.fun.substituteImplicit { inherit pkgs; scripts = lib.attrValues { inherit (lib.self.setup-scripts) zfs utils; }; context = { inherit config; native = pkgs // { zfs = zfsPackage; }; }; }}
${lib.fun.substituteImplicit { inherit pkgs; scripts = lib.attrValues { inherit (lib.self.setup-scripts) zfs utils; }; context = { inherit config; native = pkgs // { zfs = zfsPackage; } // (lib.optionalAttrs (extraUtils != null) (lib.genAttrs [
"kmod" # modprobe
"util-linux" # mount umount
"nix" "openssh" "jq" # (unused)
] (_: extraUtils))); }; }}
ensure-datasets "$@"
'';
ensure-datasets-for = filterBy: zfsPackage: ''( if [ ! "''${IN_NIXOS_ENTER:-}" ] && [ -e ${zfsPackage}/bin/zfs ] ; then
ensure-datasets-for = filterBy: zfsPackage: extraUtils: ''( if [ ! "''${IN_NIXOS_ENTER:-}" ] && [ -e ${zfsPackage}/bin/zfs ] ; then
${lib.concatStrings (map (pool: ''
expected=${lib.escapeShellArg (builtins.toJSON (lib.mapAttrs (n: v: v.props // (if v.permissions != { } then { ":permissions" = v.permissions; } else { })) (lib.filterAttrs (path: _: path == pool || lib.fun.startsWith "${pool}/" path) cfg.datasets)))}
if [ "$(${zfsPackage}/bin/zfs get -H -o value nixos-${setup}:applied-datasets ${pool})" != "$expected" ] ; then
${ensure-datasets zfsPackage} / ${lib.escapeShellArg (filter pool)} && ${zfsPackage}/bin/zfs set nixos-${setup}:applied-datasets="$expected" ${pool}
${ensure-datasets zfsPackage extraUtils} / ${lib.escapeShellArg (filter pool)} && ${zfsPackage}/bin/zfs set nixos-${setup}:applied-datasets="$expected" ${pool}
fi
'') (poolNames filterBy))}
fi )'';
in {
boot.initrd.postDeviceCommands = lib.mkIf (anyPool "autoApplyDuringBoot") (lib.mkOrder 2000 ''
${ensure-datasets-for "autoApplyDuringBoot" extraUtils}
${ensure-datasets-for "autoApplyDuringBoot" extraUtils extraUtils}
'');
boot.initrd.supportedFilesystems = lib.mkIf (anyPool "autoApplyDuringBoot") [ "zfs" ];
${setup}.zfs.extraInitrdPools = (poolNames "autoApplyDuringBoot");
system.activationScripts.A_ensure-datasets = lib.mkIf (anyPool "autoApplyOnActivation") {
text = ensure-datasets-for "autoApplyOnActivation" (pkgs.runCommandLocal "booted-system-link" { } ''ln -sT /run/booted-system/sw $out''); # (want to use the version of ZFS that the kernel module uses, also it's convenient that this does not yet exist during activation at boot)
text = ensure-datasets-for "autoApplyOnActivation" (pkgs.runCommandLocal "booted-system-link" { } ''ln -sT /run/booted-system/sw $out'') null; # (want to use the version of ZFS that the kernel module uses, also it's convenient that this does not yet exist during activation at boot)
}; # these are sorted alphabetically, unless one gets "lifted up" by some other ending on it via its ».deps« field