add connection test recipe

Justfile

@@ -332,3 +332,52 @@ uuid-to-device-name remote:
 	#!/usr/bin/env bash
 	set -e -o pipefail
 	ssh {{remote}} 'nix run nixpkgs.dmidecode -c dmidecode -s system-uuid' | xxhsum --quiet -H1 | awk '{print $1}'
+
+test-connection:
+	#! /usr/bin/env nix-shell
+	#! nix-shell -p curl zsh
+	#! nix-shell -i zsh
+	#! nix-shell --pure
+
+	while true; do 
+	  FAILURE="false"
+	  output=$(
+		echo "$(date)\n---"
+		for url in \
+			"https://172.16.0.1:65443/0.7/gui/#/login/" \
+			"https://192.168.0.1" \
+			"http://172.172.171.9" \
+			"https://172.172.171.10:65443" \
+			"https://172.172.171.11:65443" \
+			"https://172.172.171.13:443" \
+			"https://172.172.171.14:443" \
+			"http://172.172.171.15:22" \
+			"http://172.172.171.16:22" \
+			"https://crates.io" \
+			"https://holo.host" \
+			; \
+		do
+		  print "trying ${url}": $(
+			curl_output=$(curl --http0.9 -k --head --connect-timeout 0.5 ${url} 2>&1)
+			# if [ $? -ne 0 ]; then
+			if [[ "$curl_output" == *timeout* ]]; then
+			  echo failure: $(echo ${curl_output} | tail -n1)
+			  # BUG: outer FAILURE is not set by this
+			  FAILURE="true"
+			else
+			  echo success
+			fi
+		  )
+		done
+	  )
+	  clear
+	  echo ${output}
+
+	  if [[ ${FAILURE} == "true" ]]; then
+		echo something failed
+		tracepath -m5 -n1 172.16.0.1
+		tracepath -m5 -n1 192.168.0.1
+	  fi
+
+	  sleep 5
+	done