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nixos/install.fish

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Fish
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#!/usr/bin/env fish
# sudo nix --experimental-features 'nix-command flakes' run nixpkgs#fish -- install.fish
# Wrap command execution in log output with error handling
function execute
if $argv &>>install.log
echo " done."
else
echo " error."
exit 1
end
end
# Alias nix to enable flakes
alias nix "nix --experimental-features 'nix-command flakes'"
# Gather variables
set -l machine (read -P "Enter machine hostname: ")
set -l secret (read -P "Enter encryption secret: ")
# Clear logfile
echo "Logging to install.log..."
rm install.log &>/dev/null
# Create keyfile
echo -n "Creating secret.key..."
execute nix run nixpkgs#fish -- -c "echo -n $secret > /tmp/secret.key"
# Format disks
echo -n "Formatting disks..."
execute nix run disko -- -m disko machines/$machine/disko.nix
# Shred keyfile
echo -n "Shredding secret.key..."
execute shred -zu /tmp/secret.key
# Generate hardware configuration
echo -n "Generating hardware-configuration.nix..."
execute nixos-generate-config --no-filesystems --root /mnt --dir .
# Move hardware configuration
echo -n "Moving hardware-configuration.nix to machines/$machine/..."
execute mv hardware-configuration.nix machines/$machine/
# Stage files in git tree for flake to access
git add .
# Update flake
echo -n "Updating flake.lock..."
execute nix flake update
# Confirm installation of NixOS
while true
switch (read -P "Install NixOS? [Y/N] ")
case Y y
break
case N n
exit
end
end
# Install NixOS
echo -n "Installing..."
execute nixos-install --no-root-password --flake .#$machine
# Update git remote to remove personal access token
echo -n "Updating git remotes..."
git remote rm origin
execute git remote add git@github.com/Myned/nixos.git
# Copy NixOS configuration to system
echo -n "Copying NixOS configuration to /mnt/etc/nixos/..."
execute cp -r . /mnt/etc/nixos/
# Finish
echo "Installation finished. Reboot when ready."