Merge pull request #47446 from dtzWill/fix/patch-shebangs-head-error-writing-broken-pipe

patch-shebangs: use isScript to safely check for shebang start

pkgs/build-support/setup-hooks/patch-shebangs.sh

@@ -18,11 +18,11 @@ patchShebangs() {
     local oldInterpreterLine
     local newInterpreterLine
 
-    find "$dir" -type f -perm -0100 | while read f; do
-        if [ "$(head -1 "$f" | head -c+2)" != '#!' ]; then
-            # missing shebang => not a script
-            continue
-        fi
+    [ -e "$dir" ] || return 0
+
+    local f
+    while IFS= read -r -d $'\0' f; do
+        isScript "$f" || continue
 
         oldInterpreterLine=$(head -1 "$f" | tail -c+3)
         read -r oldPath arg0 args <<< "$oldInterpreterLine"
@@ -61,7 +61,7 @@ patchShebangs() {
                 rm "$f.timestamp"
             fi
         fi
-    done
+    done < <(find "$dir" -type f -perm -0100 -print0)
 
     stopNest
 }