l: add untilport

1 files changed, 18 insertions, 0 deletions

diff --git a/lass/5pkgs/untilport/default.nix b/lass/5pkgs/untilport/default.nix
new file mode 100644
index 00000000..61bcc2b8
--- /dev/null
+++ b/lass/5pkgs/untilport/default.nix
@@ -0,0 +1,18 @@
+{ pkgs, ... }:
+
+pkgs.writeDashBin "untilport" ''
+  set -euf
+
+  usage() {
+    echo 'untiport $target $port'
+    echo 'Sleeps until the destinated port is reachable.'
+    echo 'ex: untilport google.de 80 && echo "google is now reachable"'
+  }
+
+
+  if [ $# -ne 2 ]; then
+    usage
+  else
+    until ${pkgs.netcat-openbsd}/bin/nc -z "$@"; do sleep 1; done
+  fi
+''