dolomite: fix lightsail

machines/dolomite/default.nix

@@ -1,6 +1,6 @@
 { config, lib, ... }:
 let
-  awsHosts = [ "tok-00 "];
+  awsHosts = [ "tok-00"];
   bwgHosts = [ "la-00" ];
 in
 {
@@ -80,7 +80,7 @@ in
     };
 
     nix.settings = {
-      trusted-users = config.users.groups.wheel.members;
+      trusted-users = config.users.groups.wheel.members ++ [ "root" ];
     };
 
     services.sing-box = let

machines/dolomite/ec2-metadata-fetcher.sh

@@ -0,0 +1,66 @@
+metaDir=/etc/ec2-metadata
+mkdir -m 0755 -p "$metaDir"
+rm -f "$metaDir/*"
+
+get_imds_token() {
+  # retry-delay of 1 selected to give the system a second to get going,
+  # but not add a lot to the bootup time
+  curl \
+    --silent \
+    --show-error \
+    --retry 3 \
+    --retry-delay 1 \
+    --fail \
+    -X PUT \
+    --connect-timeout 1 \
+    -H "X-aws-ec2-metadata-token-ttl-seconds: 600" \
+    http://169.254.169.254/latest/api/token
+}
+
+preflight_imds_token() {
+  # retry-delay of 1 selected to give the system a second to get going,
+  # but not add a lot to the bootup time
+  curl \
+    --silent \
+    --show-error \
+    --retry 3 \
+    --retry-delay 1 \
+    --fail \
+    --connect-timeout 1 \
+    -H "X-aws-ec2-metadata-token: $IMDS_TOKEN" \
+    -o /dev/null \
+    http://169.254.169.254/1.0/meta-data/instance-id
+}
+
+try=1
+while [ $try -le 3 ]; do
+  echo "(attempt $try/3) getting an EC2 instance metadata service v2 token..."
+  IMDS_TOKEN=$(get_imds_token) && break
+  try=$((try + 1))
+  sleep 1
+done
+
+if [ "x$IMDS_TOKEN" == "x" ]; then
+  echo "failed to fetch an IMDS2v token."
+fi
+
+try=1
+while [ $try -le 10 ]; do
+  echo "(attempt $try/10) validating the EC2 instance metadata service v2 token..."
+  preflight_imds_token && break
+  try=$((try + 1))
+  sleep 1
+done
+
+echo "getting EC2 instance metadata..."
+
+get_imds() {
+  # --fail to avoid populating missing files with 404 HTML response body
+  # || true to allow the script to continue even when encountering a 404
+  curl --silent --show-error --fail --header "X-aws-ec2-metadata-token: $IMDS_TOKEN" "$@" || true
+}
+
+get_imds -o "$metaDir/ami-manifest-path" http://169.254.169.254/1.0/meta-data/ami-manifest-path
+(umask 077 && get_imds -o "$metaDir/user-data" http://169.254.169.254/1.0/user-data)
+get_imds -o "$metaDir/hostname" http://169.254.169.254/1.0/meta-data/hostname
+get_imds -o "$metaDir/public-keys-0-openssh-key" http://169.254.169.254/1.0/meta-data/public-keys/0/openssh-key

machines/dolomite/lightsail.nix

@@ -26,23 +26,19 @@ in
 
     boot.growPartition = true;
 
-    fileSystems."/" = mkIf (!cfg.zfs.enable) {
+    fileSystems."/" = {
       device = "/dev/disk/by-label/nixos";
       fsType = "ext4";
       autoResize = true;
     };
 
-    fileSystems."/boot" = mkIf (cfg.efi || cfg.zfs.enable) {
+    fileSystems."/boot" = {
       # The ZFS image uses a partition labeled ESP whether or not we're
       # booting with EFI.
       device = "/dev/disk/by-label/ESP";
       fsType = "vfat";
     };
 
-    services.zfs.expandOnBoot = mkIf cfg.zfs.enable "all";
-
-    boot.zfs.devNodes = mkIf cfg.zfs.enable "/dev/";
-
     boot.extraModulePackages = [
       config.boot.kernelPackages.ena
     ];