88 lines
2.6 KiB
Nix
88 lines
2.6 KiB
Nix
# Pull-based NixOS updates for hosts that can't be pushed to reliably.
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# CI builds the system closure on muffin (which Harmonia serves), then
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# records the output store path at /deploy/<hostname>. On boot this
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# service fetches that path, pulls the closure from the binary cache,
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# sets it as the boot profile, and reboots into it.
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#
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# Runs before the display manager so the user sees progress on the
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# console instead of staring at a frozen Steam loading screen.
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{
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pkgs,
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hostname,
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lib,
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...
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}:
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let
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deploy-url = "https://nix-cache.sigkill.computer/deploy/${hostname}";
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pull-update = pkgs.writeShellApplication {
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name = "pull-update";
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runtimeInputs = with pkgs; [
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pkgs.curl
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pkgs.coreutils
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pkgs.nix
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pkgs.systemd
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pkgs.util-linux
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];
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text = ''
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set -uo pipefail
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# wait for actual connectivity, not just networkd "up"
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for i in $(seq 1 30); do
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if curl -sf --max-time 5 "${deploy-url}" >/dev/null; then
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break
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fi
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echo "Waiting for network... ($i/30)"
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sleep 2
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done
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STORE_PATH=$(curl -sf --max-time 30 "${deploy-url}" || true)
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if [ -z "$STORE_PATH" ]; then
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echo "Server unreachable or no deployment available, skipping"
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exit 0
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fi
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CURRENT=$(readlink -f /nix/var/nix/profiles/system)
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if [ "$CURRENT" = "$STORE_PATH" ]; then
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echo "Already on latest configuration"
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exit 0
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fi
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echo ""
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echo "====================================="
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echo " System update available. Installing."
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echo "====================================="
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echo ""
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nix-store -r "$STORE_PATH" || { echo "Failed to fetch closure"; exit 1; }
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nix-env -p /nix/var/nix/profiles/system --set "$STORE_PATH" || { echo "Failed to set profile"; exit 1; }
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"$STORE_PATH/bin/switch-to-configuration" boot || { echo "Failed to install boot entry"; exit 1; }
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echo ""
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echo "Update installed. Rebooting..."
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echo ""
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systemctl reboot
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'';
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};
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in
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{
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systemd.services.pull-update = {
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description = "Pull latest NixOS configuration from binary cache";
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after = [ "network-online.target" ];
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wants = [ "network-online.target" ];
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# run before the display manager so the message is visible on the console
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before = [ "display-manager.service" ];
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wantedBy = [ "multi-user.target" ];
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restartIfChanged = false;
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serviceConfig = {
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Type = "oneshot";
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ExecStart = lib.getExe pull-update;
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StandardOutput = "journal+console";
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StandardError = "journal+console";
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};
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};
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}
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