Update

local/share/sway/scripts/once.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env sh
+
+mkdir -p "$HOME/.local/state"
+LOCKFILE="$HOME/.local/state/once.lock"
+
+# Kills the process if it's already running
+lsof -Fp "$LOCKFILE" | sed 's/^p//' | xargs -r kill
+
+flock --verbose -n "$LOCKFILE" "$@"