nix develop: Find bin/bash in the bashInteractive outputs

src/nix/develop.cc

@@ -512,9 +512,20 @@ struct CmdDevelop : Common, MixEnvironment
                 Strings{"legacyPackages." + settings.thisSystem.get() + "."},
                 nixpkgsLockFlags);
 
-            shell = store->printStorePath(
+            bool found = false;
-                Installable::toStorePath(getEvalStore(), store, Realise::Outputs, OperateOn::Output, bashInstallable))
+
-                + "/bin/bash";
+            for (auto & path : Installable::toStorePaths(getEvalStore(), store, Realise::Outputs, OperateOn::Output, {bashInstallable})) {
+                auto s = store->printStorePath(path) + "/bin/bash";
+                if (pathExists(s)) {
+                    shell = s;
+                    found = true;
+                    break;
+                }
+            }
+
+            if (!found)
+                throw Error("package 'nixpkgs#bashInteractive' does not provide a 'bin/bash'");
+
         } catch (Error &) {
             ignoreException();
         }