build(core): swap in stoppable trigger runner script

dev/BUCK

@@ -80,3 +80,8 @@ sh_binary(
   name = "setup-hydra-client",
   main = "bin/setup-hydra-client.sh",
 )
+
+sh_binary(
+  name = "stoppable-trigger",
+  main = "bin/run-stoppable-trigger.sh",
+)

dev/Tiltfile

@@ -282,7 +282,7 @@ local_resource(
     "api-trigger",
     labels = ["core"],
     cmd = "buck2 build {}".format(api_trigger_target),
-    serve_cmd = "buck2 run {}".format(api_trigger_target),
+    serve_cmd = "buck2 run //dev:stoppable-trigger {}".format(api_trigger_target),
     serve_env = core_serve_env,
     allow_parallel = True,
     readiness_probe = probe(

dev/bin/run-stoppable-trigger.sh

@@ -0,0 +1,44 @@
+#!/bin/bash
+
+buck_target="$1"
+
+REPO_ROOT=$(git rev-parse --show-toplevel)
+BATS_DIR="${REPO_ROOT}/bats"
+
+TRIGGER_PID_FILE="$BATS_DIR/.trigger_pid"
+
+CONTROL_FILE="$BATS_DIR/.stop_trigger"
+rm "$CONTROL_FILE"
+
+start_trigger() {
+  buck2 run "$buck_target" &
+  echo "$!" > "$TRIGGER_PID_FILE"
+}
+
+trigger_is_running() {
+  SERVER_PID=$(head -n 1 "$TRIGGER_PID_FILE")
+  if ps -p "$SERVER_PID" > /dev/null; then
+    return 0
+  fi
+  return 1
+}
+
+while true; do
+  if [[ -f "$CONTROL_FILE" ]]; then
+    if trigger_is_running > /dev/null; then
+      echo "Stopping server..."
+      kill -15 $SERVER_PID
+      if [[ "$?" == "0" ]]; then
+        echo "Successfully stopped trigger"
+      else
+        echo "Could not stop trigger, exiting..."
+        exit 1
+      fi
+    fi
+  else
+    if ! trigger_is_running > /dev/null; then
+      start_trigger
+    fi
+  fi
+  sleep 2
+done