From 865fa5013c9189f6d7578c348a658a873cf3b672 Mon Sep 17 00:00:00 2001
From: Connor Baker <ConnorBaker01@gmail.com>
Date: Fri, 17 Jan 2025 16:37:26 -0800
Subject: [PATCH] no-broken-symlinks: guard against double inclusions

---
 pkgs/build-support/setup-hooks/no-broken-symlinks.sh | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/pkgs/build-support/setup-hooks/no-broken-symlinks.sh b/pkgs/build-support/setup-hooks/no-broken-symlinks.sh
index 26f4838af5a8f4..8117da45d80d4e 100644
--- a/pkgs/build-support/setup-hooks/no-broken-symlinks.sh
+++ b/pkgs/build-support/setup-hooks/no-broken-symlinks.sh
@@ -1,4 +1,12 @@
 # shellcheck shell=bash
+
+# Guard against double inclusion.
+if (("${noBrokenSymlinksHookInstalled:-0}" > 0)); then
+  nixInfoLog "skipping because the hook has been propagated more than once"
+  return 0
+fi
+declare -ig noBrokenSymlinksHookInstalled=1
+
 # symlinks are often created in postFixup
 # don't use fixupOutputHooks, it is before postFixup
 postFixupHooks+=(noBrokenSymlinksInAllOutputs)