From bf99a819a16089a8df03cc06262f06b31dfb683c Mon Sep 17 00:00:00 2001
From: happysalada <raphael@megzari.com>
Date: Thu, 24 Jun 2021 19:52:02 +0900
Subject: [PATCH] setup.sh: fatal: This word should yield a string, but it
 contains an array

remove implicit array comparison in case
---
 pkgs/stdenv/generic/setup.sh | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/pkgs/stdenv/generic/setup.sh b/pkgs/stdenv/generic/setup.sh
index 388fcbaf7d84..83a623ef0801 100644
--- a/pkgs/stdenv/generic/setup.sh
+++ b/pkgs/stdenv/generic/setup.sh
@@ -364,16 +364,13 @@ findInputs() {
     local var="${!varRef}"
     unset -v varVar varRef
 
-    # TODO(@Ericson2314): Restore using associative array once Darwin
-    # nix-shell doesn't use impure bash. This should replace the O(n)
-    # case with an O(1) hash map lookup, assuming bash is implemented
-    # well :D.
-    local varSlice="${var}[*]"
-    # ${..-} to hack around old bash empty array problem
-    case "${!varSlice-}" in
-        *" $pkg "*) return 0 ;;
-    esac
-    unset -v varSlice
+    # var is a reference to an array and can sometimes be undefined
+    # so checking the array with "${!var}[@]" does not work
+    # check if $pkgs is in the var ref array
+    # TODO(@Ericson2314): Restore using associative array
+    if [[ "${var}[*]" = *" $pkg "* ]]; then
+        return 0
+    fi
 
     eval "$var"'+=("$pkg")'