Remove passing lists of args to genrule

This is required for this migration bazelbuild/bazel#5903

.bazelrc

@@ -28,8 +28,3 @@ build --nocheck_visibility
 # here forever.
 build --define=RULES_SWIFT_BUILD_DUMMY_WORKER=1
 build --strategy=SwiftCompile=local
-
-# Disable this for now because apple_support currently relies on a workaround
-# that needs to be able to pass a sequence of strings to actions.run_shell's
-# 'command'.
-build --incompatible_run_shell_command_string=false

apple/internal/codesigning_support.bzl

@@ -516,14 +516,10 @@ def _sign_binary_action(ctx, input_binary, output_binary):
         ctx,
         inputs = [input_binary],
         outputs = [output_binary],
-        command = [
-            "/bin/bash",
-            "-c",
-            "cp {input_binary} {output_binary}".format(
-                input_binary = input_binary.path,
-                output_binary = output_binary.path,
-            ) + "\n" + signing_commands,
-        ],
+        command = "cp {input_binary} {output_binary}".format(
+            input_binary = input_binary.path,
+            output_binary = output_binary.path,
+        ) + "\n" + signing_commands,
         mnemonic = "SignBinary",
         execution_requirements = {
             # Added so that the output of this action is not cached remotely, in case multiple

apple/internal/utils/legacy_actions.bzl

@@ -22,10 +22,6 @@ load(
     "@build_bazel_rules_apple//apple/internal:platform_support.bzl",
     "platform_support",
 )
-load(
-    "@bazel_skylib//lib:types.bzl",
-    "types",
-)
 
 def _add_dicts(*dictionaries):
     """Adds a list of dictionaries into a single dictionary."""
@@ -144,16 +140,6 @@ def _run_shell(
       **kwargs: Arguments to be passed into ctx.actions.run_shell.
     """
 
-    # TODO(b/77637734) remove "workaround" once the bazel issue is resolved.
-    # Bazel doesn't always get the shell right for a single string `commands`;
-    # so work around that case by faking it as a list of strings that forces
-    # the shell correctly.
-    command = kwargs.get("command")
-    if command and types.is_string(command):
-        processed_args = dict(kwargs)
-        processed_args["command"] = ["/bin/sh", "-c", command]
-        kwargs = processed_args
-
     # TODO(b/161370390): Eliminate need to make actions and platform_prerequisites optional when all
     # calls to this method with a ctx argument are eliminated.
     if not actions: