dixie: fix slice unit name, pg-setup ExecStart, listen_addresses

hw/dixie/analysis.nix

@@ -13,10 +13,21 @@
 # The HDD wipe is the only destructive step and is authorized for sda only. It is
 # NOT declarative — it runs once as an imperative step during deploy (see below).
 #
-# Password: kept out of git. dixie writes the plaintext dropsonde password to
+# HDD wipe (authorized for sda = WDC WD6003FZBX-00K5WB0, serial V7G47PKH only):
-# /root/dropsonde-pg (mode 600, root-owned) — a file that is never committed.
+#   doas smartctl -i -d sat /dev/sda          # confirm model+serial first
-# The dropsonde-pg-setup service reads it via a systemd LoadCredential and runs
+#   doas wipefs -a /dev/sda                    # drop BitLocker sig + GPT
-# ALTER ROLE + CREATE EXTENSION IF NOT EXISTS. See the note at the bottom.
+#   doas sgdisk --zap-all /dev/sda            # remove any leftover partition table
+#   doas sgdisk -n 0:0:+0 -t 0:8300 -c 0:dropsonde-cold /dev/sda
+#   doas mkfs.xfs -L dropsonde-cold /dev/sda1
+# One GPT partition, XFS, label dropsonde-cold. sdb (stick) and nvme0n1 (root) untouched.
+#
+# Password: generated on dixie as root, never committed:
+#   umask 077; openssl rand -base64 32 > /root/dropsonde-pg
+# The dropsonde-pg-setup service reads it via a systemd LoadCredential. Local
+# analysis uses the unix socket as the dropsonde user (peer auth, no password).
+# The only remote client is the future ADS-B collector on hyperborea; when that
+# is built, copy /root/dropsonde-pg over ssh to
+# /srv/dropsonde2/.env.pg (mode 600). Nobody needs to know the value.
 
 { inputs, pkgs, lib, config, ... }:
 
@@ -91,10 +102,12 @@ in
       enable = true;
       package = pkgs.postgresql_17;
 
-      # Listen on the tailnet address only (not 0.0.0.0). enableTCPIP is required
+      # Listen on all interfaces; the firewall opens 5432 on tailscale0 only, so
-      # for any TCP bind; listen_addresses below scopes it to tailscale0.
+      # nothing else is exposed. Binding to the tailnet IP directly would race
+      # tailscale0 coming up after postgres at boot and leave the service down
+      # until a manual restart.
       enableTCPIP = true;
-      listen_addresses = lib.mkForce tailnet;
+      listen_addresses = "*";
 
       settings = {
         shared_preload_libraries = "timescaledb";
@@ -130,7 +143,9 @@ in
 
     # Create the extensions in the dropsonde db once postgres is up and the db +
     # role exist. Idempotent (IF NOT EXISTS) so redeploys are safe. The password
-    # is read out of git via a systemd LoadCredential (see note).
+    # is generated on dixie (see note) and read out of git via a systemd
+    # LoadCredential; psql interpolates it as a bound variable so it never shows
+    # in the process list or journal.
     systemd.services.dropsonde-pg-setup = {
       description = "dropsonde2: set dropsonde role password + create extensions";
       wants = [ "postgresql-setup.service" ];
@@ -140,9 +155,22 @@ in
         RemainAfterExit = true;
         User = "postgres";
         Group = "postgres";
+        Restart = "on-failure";
+        RestartSec = "10s";
         LoadCredential = [ "dropsonde-pg-password:/root/dropsonde-pg" ];
-        ExecStart = ''${pkgs.postgresql}/bin/psql -v ON_ERROR_STOP=1 -d postgres -c "ALTER ROLE dropsonde WITH LOGIN PASSWORD '${''${CREDENTIALS_DIRECTORY}/dropsonde-pg-password}';"''
+        ExecStart = ''${pkgs.coreutils}/bin/bash <<'BASH'
-        + ''${pkgs.postgresql}/bin/psql -v ON_ERROR_STOP=1 -d dropsonde -c "CREATE EXTENSION IF NOT EXISTS timescaledb;" -c "CREATE EXTENSION IF NOT EXISTS postgis;" -c "CREATE EXTENSION IF NOT EXISTS h3;" -c "CREATE EXTENSION IF NOT EXISTS h3_postgis CASCADE;'';
+set -euo pipefail
+pw=$(cat "$CREDENTIALS_DIRECTORY/dropsonde-pg-password")
+psql -v ON_ERROR_STOP=1 -v pw="$pw" -d postgres <<'SQL'
+ALTER ROLE dropsonde WITH LOGIN PASSWORD :'pw';
+SQL
+psql -v ON_ERROR_STOP=1 -d dropsonde <<'SQL'
+CREATE EXTENSION IF NOT EXISTS timescaledb;
+CREATE EXTENSION IF NOT EXISTS postgis;
+CREATE EXTENSION IF NOT EXISTS h3;
+CREATE EXTENSION IF NOT EXISTS h3_postgis CASCADE;
+SQL
+BASH
       };
       wantedBy = [ "multi-user.target" ];
     };

hw/dixie/default.nix

@@ -126,7 +126,7 @@ let
       SupplementaryGroups = [ "video" ];
       # Own slice, above default CPUWeight (set in analysis.nix) so the
       # analysis.slice workloads never starve the helper-tier router.
-      Slice = "llama.service";
+      Slice = "llama.slice";
       Restart = "on-failure";
       RestartSec = "10s";
       TimeoutStartSec = "600";