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Disable home impermanence

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This commit is contained in:
Madeleine Sydney
2024-12-21 09:49:20 -07:00
parent 684e78e936
commit be5341b5b1
12 changed files with 594 additions and 262 deletions
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10
.gitignore vendored
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@@ -1,10 +0,0 @@
# A list of files generated from README.org can be gathered and inserted by
# evaluating the following snippet:
# (mapc (lambda (target)
# (insert (concat (file-relative-name target)
# "\n")))
# (org-babel-tangle-file "README.org"))
hosts/nixos-testbed/configuration.nix
modules/system/impermanence.nix
flake.nix

218
README.org
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@@ -1,225 +1,11 @@
#+PROPERTY: header-args :noweb no-export :results silent :comments both :tangle no
#+STARTUP: overview
#+title: Madeleine's dots for the literate (=sydnix=)
* Top-level flake
#+begin_src nix :tangle flake.nix
{
description = "Madeleine's dots for the literate (sydnix)";
inputs = {
<<flake-inputs>>
disko.url = "github:nix-community/disko";
nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
impermanence.url = "github:nix-community/impermanence";
home-manager = {
url = "github:nix-community/home-manager";
inputs.nixpkgs.follows = "nixpkgs";
};
};
outputs = { nixpkgs, ... }@inputs:
let list-nix-directory = dir:
builtins.attrNames
(nixpkgs.lib.filterAttrs
(k: _v: nixpkgs.lib.hasSuffix ".nix" k)
(builtins.readDir dir));
in {
# REVIEW: Why don't we put each module under nixosModules.<name>?
nixosModules.default =
let modules = list-nix-directory ./modules/nixos;
in { ... }: {
imports =
builtins.map (m: ./modules/nixos/${m}) modules;
};
homeManagerModules.default =
let modules = list-nix-directory ./modules/home;
in { ... }: {
imports =
builtins.map (m: ./modules/home/${m}) modules;
};
nixosConfigurations = (
<<flake-outputs-nixos>>
);
homeConfigurations =
let users = builtins.readDir ./users;
mkUser = username: _v: {
imports = [
(import ./users/${username}).home
inputs.self.homeManagerModules.default
({ lib, ... }: {
home.username = username;
})
inputs.impermanence.homeManagerModules.impermanence
];
};
in
builtins.mapAttrs mkUser users;
};
}
#+end_src
* Machines
For every ~./hosts/NAME/configuration.nix~, define the system under the name ~NAME~.
#+begin_src nix :noweb-ref flake-outputs-nixos
let mkHost = k: v: nixpkgs.lib.nixosSystem {
specialArgs = inputs;
system = import ./hosts/${k}/system.nix;
modules = [
./hosts/${k}/configuration.nix
inputs.self.nixosModules.default
inputs.disko.nixosModules.disko
inputs.impermanence.nixosModules.impermanence
# Directory name should always match host name.
({ ... }: { networking.hostName = k; })
# home-manager configuration.
inputs.home-manager.nixosModules.home-manager
({ config, lib, self, ... }: {
home-manager.useGlobalPkgs = true;
home-manager.useUserPackages = true;
home-manager.users =
lib.filterAttrs
(k: _v: builtins.elem k config.sydnix.users.users)
self.homeConfigurations;
home-manager.extraSpecialArgs = inputs // { inherit self; };
})
];
};
in
builtins.mapAttrs mkHost (builtins.readDir ./hosts)
#+end_src
** =nixos-testbed=
#+begin_src nix :tangle hosts/nixos-testbed/configuration.nix
{ config, pkgs, lib, disko, ... }:
{
imports = [
./hardware-configuration.nix
./disko-config.nix
];
sydnix = {
impermanence = {
enable = true;
directories = [
# Warning: Neither /var/lib/nixos nor any of its parents are persisted.
# This means all users/groups without specified uids/gids will have them
# reassigned on reboot.
"/var/lib/nixos"
];
rollbackTo = "blank";
dataset = "rpool/local/home";
archiveLimit = 3;
};
users.users = [
"crumb"
];
};
boot = {
initrd = {
enable = true;
systemd.enable = true;
systemd.initrdBin = with pkgs; [
zfs
coreutils
babashka
];
};
loader = {
systemd-boot.enable = true;
efi.canTouchEfiVariables = false;
};
};
# networking.hostName = "nixos-testbed";
networking.hostId = "238e9b1e"; # head -c 8 /etc/machine-id
time.timeZone = "America/Denver";
i18n.defaultLocale = "en_US.UTF-8";
console = {
font = "Lat2-Terminus16";
# keyMap = "us";
useXkbConfig = true; # use xkb.options in tty.
};
services.xserver.enable = true;
# services.displayManager.sddm.enable = true;
# services.desktopManager.plasma6.enable = true;
services.xserver.xkb.layout = "us";
services.xserver.xkb.options = "caps:escape";
users.users.crumb = {
isNormalUser = true;
extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
# Change this immediately after installation!
initialPassword = "password123";
};
environment.systemPackages = with pkgs; [
neovim
];
services.openssh.enable = true;
services.openssh.settings.PermitRootLogin = "yes";
# This option defines the first version of NixOS you have installed on this
# particular machine, and is used to maintain compatibility with application
# data (e.g. databases) created on older NixOS versions.
#
# Most users should NEVER change this value after the initial install, for any
# reason, even if you've upgraded your system to a new NixOS release.
#
# This value does NOT affect the Nixpkgs version your packages and OS are
# pulled from, so changing it will NOT upgrade your system - see
# https://nixos.org/manual/nixos/stable/#sec-upgrading for how to actually do
# that.
#
# This value being lower than the current NixOS release does NOT mean your
# system is out of date, out of support, or vulnerable.
#
# Do NOT change this value unless you have manually inspected all the changes
# it would make to your configuration, and migrated your data accordingly.
#
# For more information, see `man configuration.nix` or
# https://nixos.org/manual/nixos/stable/options#opt-system.stateVersion .
system.stateVersion = "24.05"; # Did you read the comment?
}
#+end_src
** =guix-rebound=
The primary desktop of a girl done with her plebian phase, and done with Guix's
bullshit.
#+title: Madeleine's nest (=sydnix=)
* References
- My darling dearest Faye's =wishsys= }:D
- [[https://github.com/rasendubi/dotfiles][rasendubi/dotfiles]]
- [[https://git.mangoiv.com/mangoiv/dotfiles][magoiv/dotfiles]]
- [[https://github.com/hlissner/dotfiles/][hlissner/dotfiles]]
- [[https://github.com/Shawn8901/nix-configuration/tree/af71d51998a6772a300f842795b947e27202fa73][Shawn8901/nix-configuration]]

159
flake.lock generated
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@@ -1,5 +1,23 @@
{
"nodes": {
"disko": {
"inputs": {
"nixpkgs": "nixpkgs"
},
"locked": {
"lastModified": 1734088167,
"narHash": "sha256-OIitVU+IstPbX/NWn2jLF+/sT9dVKcO2FKeRAzlyX6c=",
"owner": "nix-community",
"repo": "disko",
"rev": "d32f2d1750d61a476a236526b725ec5a32e16342",
"type": "github"
},
"original": {
"owner": "nix-community",
"repo": "disko",
"type": "github"
}
},
"home-manager": {
"inputs": {
"nixpkgs": [
@@ -35,7 +53,111 @@
"type": "github"
}
},
"niri": {
"inputs": {
"niri-stable": "niri-stable",
"niri-unstable": "niri-unstable",
"nixpkgs": "nixpkgs_2",
"nixpkgs-stable": "nixpkgs-stable",
"xwayland-satellite-stable": "xwayland-satellite-stable",
"xwayland-satellite-unstable": "xwayland-satellite-unstable"
},
"locked": {
"lastModified": 1734280237,
"narHash": "sha256-+dtkltYnfqR8R78YGkzn/kBn3sRAQEN5L7PWP0A0x/U=",
"owner": "sodiboo",
"repo": "niri-flake",
"rev": "8d87a092be1823ab5a9dfb9c94cc98d151302a6a",
"type": "github"
},
"original": {
"owner": "sodiboo",
"repo": "niri-flake",
"type": "github"
}
},
"niri-stable": {
"flake": false,
"locked": {
"lastModified": 1731483594,
"narHash": "sha256-Qjf7alRbPPERfiZsM9EMKX+HwjESky1tieh5PJIkLwE=",
"owner": "YaLTeR",
"repo": "niri",
"rev": "75c79116a7e40cbc0e110ce0cdd500e896458679",
"type": "github"
},
"original": {
"owner": "YaLTeR",
"ref": "v0.1.10.1",
"repo": "niri",
"type": "github"
}
},
"niri-unstable": {
"flake": false,
"locked": {
"lastModified": 1734270275,
"narHash": "sha256-FfpxEVDPQ1qSDoLOqnSK2laM6oPklgZhd2YWzxOB8Ns=",
"owner": "YaLTeR",
"repo": "niri",
"rev": "d35ad73e3572b0ac704b0c08928f53d0cfd1951f",
"type": "github"
},
"original": {
"owner": "YaLTeR",
"repo": "niri",
"type": "github"
}
},
"nixpkgs": {
"locked": {
"lastModified": 1733749988,
"narHash": "sha256-+5qdtgXceqhK5ZR1YbP1fAUsweBIrhL38726oIEAtDs=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "bc27f0fde01ce4e1bfec1ab122d72b7380278e68",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixpkgs-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"nixpkgs-stable": {
"locked": {
"lastModified": 1734017764,
"narHash": "sha256-msOfmyJSjAHgIygI/JD0Ae3JsDv4rT54Nlfr5t6MQMQ=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "64e9404f308e0f0a0d8cdd7c358f74e34802494b",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixos-24.05",
"repo": "nixpkgs",
"type": "github"
}
},
"nixpkgs_2": {
"locked": {
"lastModified": 1734119587,
"narHash": "sha256-AKU6qqskl0yf2+JdRdD0cfxX4b9x3KKV5RqA6wijmPM=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "3566ab7246670a43abd2ffa913cc62dad9cdf7d5",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixos-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"nixpkgs_3": {
"locked": {
"lastModified": 1731245184,
"narHash": "sha256-vmLS8+x+gHRv1yzj3n+GTAEObwmhxmkkukB2DwtJRdU=",
@@ -53,9 +175,44 @@
},
"root": {
"inputs": {
"disko": "disko",
"home-manager": "home-manager",
"impermanence": "impermanence",
"nixpkgs": "nixpkgs"
"niri": "niri",
"nixpkgs": "nixpkgs_3"
}
},
"xwayland-satellite-stable": {
"flake": false,
"locked": {
"lastModified": 1730166465,
"narHash": "sha256-nq7bouXQXaaPPo/E+Jbq+wNHnatD4dY8OxSrRqzvy6s=",
"owner": "Supreeeme",
"repo": "xwayland-satellite",
"rev": "a713cf46cb7db84a0d1b57c3a397c610cad3cf98",
"type": "github"
},
"original": {
"owner": "Supreeeme",
"ref": "v0.5",
"repo": "xwayland-satellite",
"type": "github"
}
},
"xwayland-satellite-unstable": {
"flake": false,
"locked": {
"lastModified": 1734112800,
"narHash": "sha256-9qSb6AJpmzV3oYRfsyEt0e9eju6UeXDSD1poeSwadKo=",
"owner": "Supreeeme",
"repo": "xwayland-satellite",
"rev": "c45c2ed990912c26e6aed0f47bfddb03993d7999",
"type": "github"
},
"original": {
"owner": "Supreeeme",
"repo": "xwayland-satellite",
"type": "github"
}
}
},

130
flake.nix Normal file
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@@ -0,0 +1,130 @@
{
description = "Madeleine's dots for the illiterate (sydnix)";
inputs = {
disko.url = "github:nix-community/disko";
nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
impermanence.url = "github:nix-community/impermanence";
home-manager = {
url = "github:nix-community/home-manager";
inputs.nixpkgs.follows = "nixpkgs";
};
niri.url = "github:sodiboo/niri-flake";
};
outputs = { nixpkgs, ... }@inputs:
let list-nix-directory = dir:
builtins.attrNames
(nixpkgs.lib.filterAttrs
(k: _v: nixpkgs.lib.hasSuffix ".nix" k)
(builtins.readDir dir));
in {
# REVIEW: Why don't we put each module under nixosModules.<name>?
nixosModules.default =
let modules = list-nix-directory ./modules/nixos;
in { ... }: {
imports =
builtins.map (m: ./modules/nixos/${m}) modules;
};
homeManagerModules.default =
let modules = list-nix-directory ./modules/home;
in { ... }: {
imports =
builtins.map (m: ./modules/home/${m}) modules;
};
nixosConfigurations = (
let mkHost = k: v: nixpkgs.lib.nixosSystem {
specialArgs = inputs;
system = import ./hosts/${k}/system.nix;
# TODO: This is very ad-hoc, and I don't like it. Organise this better.
modules = [
./hosts/${k}/configuration.nix
inputs.self.nixosModules.default
inputs.disko.nixosModules.disko
inputs.impermanence.nixosModules.impermanence
# Directory name should always match host name.
({ ... }: { networking.hostName = k; })
# Get system users
({ config, lib, ... }: {
users.users =
(lib.mapAttrs
(k: v: (import ./users/${k}).systemUser)
(lib.filterAttrs
(k: _v: builtins.elem k config.sydnix.users.users)
(builtins.readDir ./users)));
})
# Nixpkgs configuration
({ pkgs, ... }: {
nixpkgs.config.allowUnfree = true;
documentation = {
man.enable = true;
info.enable = true;
};
environment.systemPackages = with pkgs; [
man-pages
stdman
man-pages-posix
stdmanpages
];
})
# home-manager configuration.
inputs.home-manager.nixosModules.home-manager
({ config, lib, self, ... }: {
home-manager.useGlobalPkgs = true;
home-manager.useUserPackages = true;
home-manager.users =
lib.filterAttrs
(k: _v: builtins.elem k config.sydnix.users.users)
self.homeConfigurations;
home-manager.extraSpecialArgs = inputs // { inherit self; };
})
];
};
in
builtins.mapAttrs mkHost (builtins.readDir ./hosts)
);
homeConfigurations =
let users = builtins.readDir ./users;
mkUser = username: _v: {
# TODO: This is very ad-hoc, and I don't like it. Organise this better.
imports = [
(import ./users/${username}).home
inputs.self.homeManagerModules.default
({ lib, ... }: {
home.username = username;
})
({ pkgs, lib, ... }: {
nix = {
settings.experimental-features =
lib.mkDefault
[ "nix-command" "flakes" ];
};
})
inputs.impermanence.homeManagerModules.impermanence
];
};
in
builtins.mapAttrs mkUser users;
};
}

103
hosts/nixos-testbed/configuration.nix Normal file
View File

@@ -0,0 +1,103 @@
{ config, pkgs, lib, disko, ... }:
{
imports = [
./hardware-configuration.nix
./disko-config.nix
];
sydnix = {
impermanence = {
enable = true;
directories = [
# Warning: Neither /var/lib/nixos nor any of its parents are persisted.
# This means all users/groups without specified uids/gids will have them
# reassigned on reboot.
"/var/lib/nixos"
"/etc/ssh"
];
rollbackTo = "blank";
dataset = "rpool/local/home";
archiveLimit = 3;
};
users.users = [
"crumb"
];
# niri.enable = true;
};
boot = {
initrd = {
enable = true;
systemd.enable = true;
systemd.initrdBin = with pkgs; [
zfs
coreutils
babashka
];
};
loader = {
systemd-boot.enable = true;
efi.canTouchEfiVariables = false;
};
};
# networking.hostName = "nixos-testbed";
networking.hostId = "238e9b1e"; # head -c 8 /etc/machine-id
time.timeZone = "America/Denver";
i18n.defaultLocale = "en_US.UTF-8";
console = {
font = "Lat2-Terminus16";
# keyMap = "us";
useXkbConfig = true; # use xkb.options in tty.
};
services.xserver.enable = true;
services.displayManager.sddm.enable = true;
services.desktopManager.plasma6.enable = true;
services.xserver.xkb.layout = "us";
services.xserver.xkb.options = "caps:escape";
environment.systemPackages = with pkgs; [
neovim
git
];
services.openssh.enable = true;
services.openssh.settings.PermitRootLogin = "yes";
# services.xserver.windowManager.qtile = {
# enable = true;
# extraPackages = python3Packages: with python3Packages; [
# qtile-extras
# hy
# ];
# };
# This option defines the first version of NixOS you have installed on this
# particular machine, and is used to maintain compatibility with application
# data (e.g. databases) created on older NixOS versions.
#
# Most users should NEVER change this value after the initial install, for any
# reason, even if you've upgraded your system to a new NixOS release.
#
# This value does NOT affect the Nixpkgs version your packages and OS are
# pulled from, so changing it will NOT upgrade your system - see
# https://nixos.org/manual/nixos/stable/#sec-upgrading for how to actually do
# that.
#
# This value being lower than the current NixOS release does NOT mean your
# system is out of date, out of support, or vulnerable.
#
# Do NOT change this value unless you have manually inspected all the changes
# it would make to your configuration, and migrated your data accordingly.
#
# For more information, see `man configuration.nix` or
# https://nixos.org/manual/nixos/stable/options#opt-system.stateVersion .
system.stateVersion = "24.05"; # Did you read the comment?
}

46
modules/home/impermanence.nix
View File

@@ -7,10 +7,34 @@ let
in {
options = {
sydnix.impermanence = {
enable = mkOption {
description = "Enable Impermanence";
type = types.bool;
default = false;
enable = mkEnableOption "impermanence";
mutableDotfiles = {
enable = mkEnableOption "dotfiles under impermanence";
# storeAt = mkOption {
# default = "dots/config";
# type = types.str;
# # type = with types;
# # addCheck
# # path
# # (x: cfg.mutableDotfiles.enable
# # -> ! (elem x cfg.mutableDotfiles.directories));
# };
files = mkOption {
default = [];
# FIXME: Inaccurate type.
type = with types;
listOf anything;
};
directories = mkOption {
default = [];
# FIXME: Inaccurate type.
type = with types;
listOf anything;
};
};
directories = mkOption {
@@ -28,10 +52,22 @@ in {
};
config = mkIf cfg.enable {
home.persistence."/persist/home/${config.home.username}" = {
home.persistence = {
"/persist/home/${config.home.username}" = {
allowOther = true;
directories = cfg.directories;
files = cfg.files;
};
} // (if ! cfg.mutableDotfiles.enable
then {}
else {
"/persist/dots/users/${config.home.username}/dots/" = {
removePrefixDirectory = true;
directories = cfg.mutableDotfiles.directories;
files = cfg.mutableDotfiles.files;
allowOther = true;
};
});
};
}

28
modules/nixos/erase-home-darlings.clj
View File

@@ -1,17 +1,19 @@
#!/usr/bin/env bb
;;; TODO: rewrite with fewer assumptions about the filesystem structure.
;; TODO: rewrite with fewer assumptions about the filesystem structure. Perhaps
;; we can achieve near-atomicity by doing to bulk of the work with a function
;; `erase-home-darlings : FileSystem -> Maybe FileSystem`, which will not do any
;; IO.
;;; TODO: option to either move OR copy
;; TODO: option to either move OR copy
(require '[clojure.core.match :refer [match]]
'[babashka.cli :as cli]
'[clojure.pprint :as pp]
'[clojure.tools.logging :as l]
'[babashka.process :refer [shell check process] :as p])
(defn get-files [{:keys [rollback-to dataset]}]
;; (prn rollback-to)
;; (prn dataset)
(let [snapshot (str dataset "@" rollback-to)
diff (:out (shell {:out :string}
"zfs diff -HF"
@@ -139,9 +141,27 @@ More precisely,
(defn -main [opts]
(pp/pprint opts)
(with-echoed-shell-commands
(shell "mount" (:dataset opts) "/home")
(let [files (get-files opts)]
(archive-files opts files)
(cycle-archives opts)
(do-rollback opts))))
#_
(def fs-ops
{:zfs {:get-files zfs-get-files
:rollback zfs-rollback}})
#_
(defn -main [opts]
(let [test-bin (fn [x]
(printf "%s: %s\n"
x (map str (fs/which-all x))))]
(test-bin "mount")
(test-bin "findmnt")
(test-bin "zfs"))
(shell "mount")
(shell "ls -la /home"))
(-main (cli/parse-opts *command-line-args* cli-spec))

44
modules/nixos/impermanence.nix
View File

@@ -20,6 +20,11 @@ in {
default = [];
};
persistGroupName = mkOption {
default = "persist";
type = types.str;
};
files = mkOption {
description = "";
@@ -45,10 +50,28 @@ in {
};
config = mkIf cfg.enable {
users.groups.${cfg.persistGroupName} = {
name = cfg.persistGroupName;
};
systemd.tmpfiles.settings = {
"10-persist" = {
"/persist" = {
z = {
group = cfg.persistGroupName;
mode = "2775";
};
};
};
};
boot.initrd.systemd.initrdBin = with pkgs; [
zfs
];
# TODO: Move this somewhere else.
programs.fuse.userAllowOther = true;
boot.initrd.systemd.services.erase-darlings =
let service = {
description = "Rollback filesystem to a blank state on boot";
@@ -77,16 +100,20 @@ in {
then service
else throw "sydnix.impermanence currently requires config.boot.initrd.systemd.enable'!";
systemd.services.erase-home-darlings = {
systemd.services =
let erase-home-darlings = {
description = "Rollback home to a blank state on boot";
wantedBy = [
"multi-user.target"
"local-fs-pre.target"
"zfs-mount.service"
];
after = [
"home.mount"
before = [
"local-fs.target"
"local-fs-pre.target"
"zfs-mount.service"
];
path = [ pkgs.zfs pkgs.babashka ];
# unitConfig.DefaultDependencies = "no";
path = [ pkgs.zfs pkgs.babashka pkgs.util-linux ];
unitConfig.DefaultDependencies = "no";
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
@@ -97,8 +124,11 @@ in {
stopIfChanged = false;
restartIfChanged = false;
};
in {
# inherit erase-home-darlings;
};
environment.persistence."/persist" = {
environment.persistence."/persist/root" = {
directories = cfg.directories;
files = cfg.files;
};

51
modules/nixos/niri.nix Normal file
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@@ -0,0 +1,51 @@
{ config, lib, pkgs, niri, ... }:
with lib;
let
cfg = config.sydnix.niri;
in {
options = {
sydnix.niri = {
enable = mkEnableOption "Niri";
};
};
imports = [
niri.nixosModules.niri
];
config = mkIf cfg.enable {
programs.niri = {
enable = true;
};
services.pipewire.enable = true;
# programs.niri.enable = true;
# hardware = {
# graphics = {
# enable = true;
# extraPackages = with pkgs; [
# intel-media-sdk
# mesa
# ];
# enable32Bit = true;
# };
# nvidia = {
# open = false;
# modesetting.enable = true;
# };
# };
# environment.systemPackages = with pkgs; [
# fuzzel
# ];
# services.xserver.videoDrivers = [ "qxl" "nvidia" ];
# services.qemuGuest.enable = true;
# services.spice-vdagentd.enable = true;
};
}

30
users/crumb/default.nix
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@@ -1,12 +1,38 @@
{
systemUser = {
isNormalUser = true;
extraGroups = [ "wheel" "persist" ];
# Change this immediately after installation!
initialPassword = "password123";
};
home = { config, lib, pkgs, ... }: {
sydnix.impermanence = {
enable = true;
enable = false;
directories = [
# ".ssh"
# ".config/systemd"
];
mutableDotfiles = {
enable = false;
# files = [
# "nvim/.config/nvim/init.vim"
# "nvim/.vimrc"
# ];
# directories = [
# "qtile"
# ];
};
};
home = {
stateVersion = "18.09";
packages = [ pkgs.hello ];
packages = [
pkgs.hello
# pkgs.wezterm
];
};
};
}

1
users/crumb/dots/nvim/.config/nvim/init.vim Normal file
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@@ -0,0 +1 @@
so ~/.vimrc

2
users/crumb/dots/nvim/.vimrc Normal file
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@@ -0,0 +1,2 @@
imap jk <ESC>
xmap JK <ESC>