select: fix non escaped '

pkgs/clan-cli/clan_lib/flake/flake.py

@@ -755,19 +755,21 @@ class Flake:
             in
               derivation {{
                 name = "clan-flake-select";
-                system = "{config["system"]}";
+                result = builtins.toJSON [
-                builder = "/bin/sh";
-                args = [
-                  "-c"
-                  ''
-                    printf %s '${{builtins.toJSON [
                     {" ".join(
                         [
                             f"(selectLib.applySelectors (builtins.fromJSON ''{attr}'') flake)"
                             for attr in str_selectors
                         ]
                     )}
-                    ]}}' > $out
+                ];
+                passAsFile = [ "result" ];
+                system = "{config["system"]}";
+                builder = "/bin/sh";
+                args = [
+                  "-c"
+                  ''
+                     read -r x < "$resultPath"; printf %s "$x" > $out
                   ''
                 ];
               }}
@@ -784,7 +786,7 @@ class Flake:
 
         if tmp_store:
             build_output = tmp_store.joinpath(*build_output.parts[1:])
-        outputs = json.loads(build_output.read_text())
+        outputs = json.loads(build_output.read_bytes())
         if len(outputs) != len(selectors):
             msg = f"flake_prepare_cache: Expected {len(outputs)} outputs, got {len(outputs)}"
             raise ClanError(msg)