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About

Welcome to the bikeshed!

This repository houses all my machine configurations expressed declaratively using a Nix flake. It covers both my personal and work devices that are running either NixOS or macOS.

The expressions are organised into platform-agnostic modules that leverage the likes of the nixpkgs, home-manager and nix-darwin to fully configure the OS and userspace from scratch.

These days I am spending the majority of time in either Firefox or Emacs (+vterm). On NixOS I am using EXWM and on macOS I am usually just running native fullscreen, ⌘↹ing between the two previously mentioned apps. Additionally, a simple theming system is used to switch various things between light and dark versions, and a secrets attribute set (kept encrypted in a private repository) is referenced throughout.

NOTE: Some twisted souls found value in all the ricing of the previous incarnation of this repository. I’ll keep archived on this branch for reference.

CI (Travis for NixOS, GitHub Actions for macOS) runs on push. The jobs generate a special CI machine that imports every module, and derives either a NixOS VM (via QEMU) or simply builds on a fresh Darwin agent VM (in the case of macOS). The resultant binaries are pushed to Cachix and subsequently become available for any of my other machines, saving a lot of wasted battery!

The Makefile (in conjunction with some helpful aliases) is used to drive most actions, abstracting away NixOS/macOS differences where necessary.

Installation Notes

Below are some rough platform specific installation notes I use to go from fresh installs to fully configured machine.

macOS

From a fresh macOS install.

Enable SSHd

sudo systemsetup -setremotelogin on

Install XCode

sudo xcodebuild -license

Change hostname to match target Nix machine

sudo scutil --set HostName nixmachine
sudo scutil --set LocalHostName nixmachine
sudo scutil --set ComputerName nixmachine
dscacheutil -flushcache

Add a new keys group

For sops-nix.

  1. System settings –> Users and Groups –> Add Account –> Group
  2. Press (i) on keys and attach it to mbaillie

Install Homebrew for those macOS GUI apps unmanageable through Nix

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"

[APPLE SILICON] Install Rosetta2

softwareupdate --install-rosetta

Install Nix (multi-user)

curl --proto '=https' --tlsv1.2 -sSf -L \
    https://install.determinate.systems/nix | \
    sh -s -- install

[OPTIONAL] Seed Nix store contents from an existing Darwin machine

nix copy --no-check-sigs --keep-going --to ssh-ng://$REMOTE ~/.nix-profile

Grab dotfiles using forwarded agent

sudo git clone --recursive git@github.com:martinbaillie/dotfiles.git /etc/dotfiles
sudo chown -R $USER: /etc/dotfiles

Set up Cachix one-off

nix-shell -p cachix
cachix use martinbaillie

Switch to Nix configuration based on hostname

make switch

Switch login shell to zsh

chsh -s /run/current-system/sw/bin/zsh $USER

Configure Emacs

make config-emacs

Configure Casks

Set Flux, Karabiner, Spectacle, Cursorcerer to start at boot, install kernel extensions and so on.

Bump Kernel / User Limits

NixOS

Media

Download and verify latest NixOS minimal ISO:

"21.05"

#+RESULTS[8f7a4f3511d5d6152ec17fdf52addc1eecd1a880]: nixos-ver

21.05
(format "%s.2796.110a2c9ebbf" nixos-ver)

#+RESULTS[d02522c67a569b479981b108c6d2236d90a80aec]: nixos-rel

21.05.2796.110a2c9ebbf
(format "https://releases.nixos.org/nixos/%s" nixos-ver)

#+RESULTS[6ea8b95b40577283983b31f1862093ba872ded97]: nixos-url

https://releases.nixos.org/nixos/21.05
curl -O ${NIXOS_URL}/nixos-${NIXOS_REL}/nixos-minimal-${NIXOS_REL}-x86_64-linux.iso
curl -O ${NIXOS_URL}/nixos-${NIXOS_REL}/nixos-minimal-${NIXOS_REL}-x86_64-linux.iso.sha256
sha256sum -c nixos-minimal-${NIXOS_REL}-x86_64-linux.iso.sha256

Create a bootable NixOS USB (macOS example):

diskutil list # Find USB
diskutil unmountDisk /dev/disk2
dd if=nixos-minimal-${NIXOS_REL}-x86_64-linux.iso of=/dev/rdisk2 bs=4m
diskutil unmountDisk /dev/disk2

Create a bootable NixOS USB (NixOS example):

lsblk -i # Locate the device.
cp nixos-minimal-${NIXOS_REL}-x86_64-linux.iso /dev/sdX # Target whole disk.

BIOS Tweaks (ThinkPad)

  • [X] Disable Secure Boot
  • [X] Enable CSM Support

Boot

Setup networking:

sudo su
wpa_supplicant -B -i interface -c <(wpa_passphrase 'SSID' 'key')
ip addr

Conduct rest of install from other laptop for convenience (+SSH agent forwarding):

ssh -A root@<addr>

Partition

Create a 500M boot partition:

gdisk /dev/nvme0n1
#  o (create new empty partition table)
#  n (add partition, 500M, type ef00 EFI)
#  n (add partition, remaining space, type 8301 Linux Reserved - in the absence of a LUKS code)
#  w (write partition table and exit)

Setup the encrypted LUKS partition and open it:

cryptsetup luksFormat /dev/nvme0n1p2
cryptsetup luksOpen /dev/nvme0n1p2 enc-pv

Create two logical volumes (swap and root):

pvcreate /dev/mapper/enc-pv
vgcreate vg /dev/mapper/enc-pv
lvcreate -L 8G -n swap vg
lvcreate -l '100%FREE' -n root vg

Format the partitions:

mkfs.fat -F 32 /dev/nvme0n1p1
mkfs.ext4 -L root /dev/vg/root
mkswap -L swap /dev/vg/swap

Install

Mount the partitions just created under /mnt:

mount /dev/vg/root /mnt
mkdir /mnt/boot
mount /dev/nvme0n1p1 /mnt/boot
swapon /dev/vg/swap

Install:

useradd -m -G wheel martin
sudo su - martin
nix-shell -p git --run \
    git clone --recursive git@github.com:martinbaillie/dotfiles.git \
    /mnt/etc/dotfiles

nix-shell -p nixUnstable -p git
sudo -E nixos-install --option pure-eval no --flake .\#$HOSTNAME

# make -C /mnt/etc/dotfiles install

Iterative Troubleshooting

If system doesn’t boot:

cryptsetup luksOpen /dev/nvme0n1p2 enc-pv
lvchange -a y /dev/vg/swap
lvchange -a y /dev/vg/root
mount /dev/vg/root /mnt
mount /dev/nvme0n1p1 /mnt/boot
swapon /dev/vg/swap
wpa_supplicant -B -i interface -c <(wpa_passphrase 'SSID' 'key')
nixos-enter

Try again.

Import GPG key

gpg --import ~/.gnupg/gpg.asc

Configure Emacs

make config-emacs

References