From ca156a66b75999153d746f57a11a19222fd5cdfb Mon Sep 17 00:00:00 2001
From: Andrew Childs <lorne@cons.org.nz>
Date: Tue, 9 Feb 2021 12:51:42 +0900
Subject: [PATCH] stdenv/patchShebangs: fix off by one reading old interpreter

This caused shebangs that were already store paths to be rewritten.

Introduced by ab4c35982269e8f1f15e07afa7fedf65c749f276 in #94642

Example difference:

    $ echo "hello world" | tail -c+3
    llo world

    $ str="hello world"; echo ${str:3}
    lo world
---
 pkgs/build-support/setup-hooks/patch-shebangs.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/build-support/setup-hooks/patch-shebangs.sh b/pkgs/build-support/setup-hooks/patch-shebangs.sh
index d0efe039ced8..04ebcd2cc64e 100644
--- a/pkgs/build-support/setup-hooks/patch-shebangs.sh
+++ b/pkgs/build-support/setup-hooks/patch-shebangs.sh
@@ -51,7 +51,7 @@ patchShebangs() {
         isScript "$f" || continue
 
         read -r oldInterpreterLine < "$f"
-        read -r oldPath arg0 args <<< "${oldInterpreterLine:3}"
+        read -r oldPath arg0 args <<< "${oldInterpreterLine:2}"
 
         if [[ -z "$pathName" ]]; then
             if [[ -n $strictDeps && $f == "$NIX_STORE"* ]]; then