fix disc flag when complie python (pytorch#39)

* fix bazel flag when complie python

* fix lint.

setup.py

@@ -254,17 +254,19 @@ def bazel_build(self, ext):
 
     # package BladeDISC distribution files
     # please note, TorchBlade also create some symbolic links to 'torch_blade' dir
-    disc_ral_so_name = 'libral_base_context.so'
-    bazel_bin_path = 'build/temp.linux-x86_64-cpython-310/bazel-bin/external/disc_compiler'
-    shutil.copyfile(
-        os.path.join(bazel_bin_path, disc_ral_so_name),
-        '/'.join([ext_dest_dir, disc_ral_so_name]))
-
-    disc_customop_so_name = 'libdisc_custom_ops.so'
-    bazel_bin_path = 'build/temp.linux-x86_64-cpython-38/bazel-bin/external/disc_compiler'
-    shutil.copyfile(
-        os.path.join(bazel_bin_path, disc_customop_so_name),
-        '/'.join([ext_dest_dir, disc_customop_so_name]))
+
+    if build_util.check_env_flag('ENABLE_DISC', 'true'):
+      disc_ral_so_name = 'libral_base_context.so'
+      bazel_bin_path = 'build/temp.linux-x86_64-cpython-310/bazel-bin/external/disc_compiler'
+      shutil.copyfile(
+          os.path.join(bazel_bin_path, disc_ral_so_name),
+          '/'.join([ext_dest_dir, disc_ral_so_name]))
+
+      disc_customop_so_name = 'libdisc_custom_ops.so'
+      bazel_bin_path = 'build/temp.linux-x86_64-cpython-310/bazel-bin/external/disc_compiler'
+      shutil.copyfile(
+          os.path.join(bazel_bin_path, disc_customop_so_name),
+          '/'.join([ext_dest_dir, disc_customop_so_name]))
 
 
 class Develop(develop.develop):