fix(package): sentinèlla: use ip(8) for local-IP detection (inetutils hostname lacks -I); harden numeric parsing

package/sentinèlla/default.nix

@@ -1,4 +1,4 @@
-{ symlinkJoin, writeTextFile, socat, dash, hectic, curl, gawk, jq, inetutils, getent, bind }:
+{ symlinkJoin, writeTextFile, socat, dash, hectic, curl, gawk, jq, iproute2, getent, bind }:
 let
   shell = "${dash}/bin/dash";
   bashOptions = [
@@ -36,7 +36,7 @@ let
   watcher = hectic.writeShellApplication {
     inherit shell bashOptions;
     name = "watcher";
-    runtimeInputs = [ curl jq gawk inetutils getent bind.dnsutils ];
+    runtimeInputs = [ curl jq gawk iproute2 getent bind.dnsutils ];
     text = ''
       ${builtins.readFile ./log.sh}
       ${builtins.readFile ./colors.sh}

package/sentinèlla/watcher.sh

@@ -61,7 +61,10 @@ local_ips() {
     printf '%s' "$SELF"
     return
   fi
-  hostname -I 2>/dev/null || true
+  # ip -o -4 addr show: "<idx>: <iface>    inet <ip>/<prefix> ..."
+  ip -o addr show 2>/dev/null \
+    | awk '$3 ~ /^inet6?$/ { sub(/\/.*/, "", $4); print $4 }' \
+    | tr '\n' ' '
 }
 
 # is_local_ip(ip) — returns 0 if ip belongs to this node
@@ -151,8 +154,15 @@ while :; do
 
     ok="down"; total=0; good=0
     if [ "$code" = "200" ]; then
-      summary=$(printf '%s' "$body" | parse_summary || true)
-      [ -n "$summary" ] && { total=${summary%% *}; good=${summary#* }; }
+      summary=$(printf '%s' "$body" | parse_summary 2>/dev/null || true)
+      if [ -n "$summary" ]; then
+        _total=${summary%% *}
+        _good=${summary#* }
+        case "$_total" in ''|*[!0-9]*) _total=0 ;; esac
+        case "$_good"  in ''|*[!0-9]*) _good=0  ;; esac
+        total=$_total
+        good=$_good
+      fi
       [ "$total" -eq "$good" ] && ok="up"
     fi