sane-scripts: lift sane-ip-check out of resholve

pkgs/additional/sane-scripts/default.nix

@@ -26,7 +26,6 @@ let
           # see: <https://github.com/abathur/resholve/issues/26>
           "bin"
           coreutils-full
-          curl
           file
           findutils
           gnugrep
@@ -39,6 +38,7 @@ let
           oath-toolkit
           openssh
           openssl
+          py-scripts.ip-check
           rmlint
           rsync
           ssh-to-age
@@ -157,6 +157,11 @@ let
       src = ./src;
       pkgs = [ "git" ];
     };
+    ip-check = static-nix-shell.mkBash {
+      pname = "sane-ip-check";
+      src = ./src;
+      pkgs = [ "curl" "gnugrep" ];
+    };
     ip-check-upnp = static-nix-shell.mkPython3Bin {
       pname = "sane-ip-check-upnp";
       src = ./src;

pkgs/additional/sane-scripts/src/sane-ip-check

@@ -1,4 +1,5 @@
-#!/usr/bin/env bash
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p curl -p gnugrep
 ip=$(curl --silent https://ipinfo.io/ip)
 echo "$ip" | grep -P " *^\d+\.\d+\.\d+\.\d+ *$"
 exit $?