feat(install): add disko direct-url workflow

scripts/install-btrfs.sh

@@ -1,17 +1,18 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-# Non-interactive Btrfs installer using the flake in this repo.
+# Non-interactive Btrfs installer using disko-install.
 # Defaults: DISK=/dev/vda TARGET_HOST=nanuqsaurus
+# If FLAKE is unset and /etc/nixos/flake.nix exists, it uses /etc/nixos.
+# Otherwise, set FLAKE to a flake URI like:
+#   - git+https://codeberg.org/<owner>/<repo>.git
+#   - github:<owner>/<repo>
 
 DISK="${DISK:-/dev/vda}"
 TARGET_HOST="${TARGET_HOST:-nanuqsaurus}"
-
-SCRIPT_DIR="$(cd -- "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-REPO_ROOT="$(cd -- "$SCRIPT_DIR/.." && pwd)"
+FLAKE="${FLAKE:-}"
 
 MNT=/mnt
-EFI_SIZE=550M
 
 have() { command -v "$1" >/dev/null 2>&1; }
 
@@ -27,85 +28,34 @@ confirm_disk() {
   sleep 5
 }
 
+resolve_flake() {
+  if [[ -n "$FLAKE" ]]; then
+    return 0
+  fi
+
+  if [[ -e /etc/nixos/flake.nix ]]; then
+    FLAKE=/etc/nixos
+    return 0
+  fi
+
+  die "FLAKE is unset. Set FLAKE to a flake URI (or run from an ISO that provides /etc/nixos)."
+}
+
 clear
 confirm_disk
+resolve_flake
 
-echo "[1/7] Partitioning ${DISK}"
-sfdisk "$DISK" <<EOF
-label: gpt
-,${EFI_SIZE},U
-,,L
-EOF
-
-echo "[2/7] Formatting filesystems"
-mkfs.fat -F32 "${DISK}1"
-mkfs.btrfs -f "${DISK}2"
-
-echo "[3/7] Creating Btrfs subvolumes"
-mkdir -p "$MNT"
-mount "${DISK}2" "$MNT"
-
-for subvol in root home nix; do
-  btrfs subvolume create "$MNT/$subvol"
-done
-
-umount "$MNT"
-
-echo "[4/7] Mounting subvolumes"
-mount -o compress=zstd,subvol=root "${DISK}2" "$MNT"
-mkdir -p "$MNT"/{home,nix,boot}
-
-mount -o compress=zstd,subvol=home "${DISK}2" "$MNT/home"
-mount -o compress=zstd,subvol=nix  "${DISK}2" "$MNT/nix"
-mount "${DISK}1" "$MNT/boot"
-
-echo "[5/7] Copying flake to /etc/nixos"
-mkdir -p "$MNT/etc/nixos"
-
-EXCLUDES=(--exclude=.git --exclude=result --exclude=node_modules)
-
-if have rsync; then
-  rsync -a "${EXCLUDES[@]}" "$REPO_ROOT/" "$MNT/etc/nixos/"
-else
-  (cd "$REPO_ROOT" && tar -cf - "${EXCLUDES[@]/#/--exclude=}" .) \
-    | (cd "$MNT/etc/nixos" && tar -xf -)
-fi
-
-echo "[6/7] Generating hardware config"
-HOSTS_DIR="$MNT/etc/nixos/hosts"
-mkdir -p "$HOSTS_DIR"
-
-HW_FILE="$HOSTS_DIR/local-${TARGET_HOST}-hardware.nix"
-HOST_FILE="$HOSTS_DIR/local-${TARGET_HOST}.nix"
-
-nixos-generate-config --root "$MNT" --show-hardware-config > "$HW_FILE"
-
-if [[ ! -e "$HOST_FILE" ]]; then
-  cat > "$HOST_FILE" <<EOF
-{ inputs, ... }:
-
-{
-  imports = [
-    inputs.lix-module.nixosModules.lixFromNixpkgs
-    ../modules/system/base.nix
-    ../modules/system/packages.nix
-    ../modules/system/home-manager-skel.nix
-    ../modules/desktop/gnome-minimal.nix
-    ../modules/users/admin.nix
-    ./local-${TARGET_HOST}-hardware.nix
-  ];
-
-  networking.hostName = "${TARGET_HOST}";
-}
-EOF
-fi
-
-echo "[7/7] Installing ${TARGET_HOST} via flake"
+echo "[1/1] Installing ${TARGET_HOST} via disko-install"
 LOG=/tmp/nixos-install.log
-nixos-install \
-  --root "$MNT" \
-  --flake "$MNT/etc/nixos#local-${TARGET_HOST}" \
-  --no-root-passwd |& tee "$LOG"
+
+nix \
+  --experimental-features "nix-command flakes" \
+  run "github:nix-community/disko/latest#disko-install" -- \
+  --mode format \
+  --flake "${FLAKE}#${TARGET_HOST}" \
+  --disk main "${DISK}" \
+  --mount-point "$MNT" \
+  --system-config '{"users":{"users":{"root":{"hashedPassword":"!"}}}}' |& tee "$LOG"
 
 echo "Install log saved to $LOG"
 echo "Install complete. You can reboot now."