From 69709798c6b42dffe3a93dc9a119bfeb9dcadd9c Mon Sep 17 00:00:00 2001
From: Ilya Epifanov <elijah.epifanov@gmail.com>
Date: Wed, 8 May 2019 13:50:25 +0200
Subject: [PATCH] mounting the superproject directory

---
 pre_commit/git.py              | 8 ++++++++
 pre_commit/languages/docker.py | 9 ++++++---
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/pre_commit/git.py b/pre_commit/git.py
index 64e449cb..113b8f67 100644
--- a/pre_commit/git.py
+++ b/pre_commit/git.py
@@ -39,6 +39,14 @@ def get_root():
     return cmd_output('git', 'rev-parse', '--show-toplevel')[1].strip()
 
 
+def get_superproject_root():
+    stdout = cmd_output('git',
+                        'rev-parse',
+                        '--show-superproject-working-tree',
+                        '--show-toplevel')
+    return stdout[1].splitlines()[0].strip()
+
+
 def get_git_dir(git_root='.'):
     opts = ('--git-common-dir', '--git-dir')
     _, out, _ = cmd_output('git', 'rev-parse', *opts, cwd=git_root)
diff --git a/pre_commit/languages/docker.py b/pre_commit/languages/docker.py
index 59a53b4f..fb3f3e28 100644
--- a/pre_commit/languages/docker.py
+++ b/pre_commit/languages/docker.py
@@ -5,7 +5,7 @@ import hashlib
 import os
 
 import pre_commit.constants as C
-from pre_commit import five
+from pre_commit import five, git
 from pre_commit.languages import helpers
 from pre_commit.util import CalledProcessError
 from pre_commit.util import clean_path_on_failure
@@ -74,6 +74,9 @@ def install_environment(
 
 
 def docker_cmd():  # pragma: windows no cover
+    superproject_dir = git.get_superproject_root()
+    project_dir = git.get_root()
+    project_relpath = os.path.relpath(project_dir, superproject_dir)
     return (
         'docker', 'run',
         '--rm',
@@ -81,8 +84,8 @@ def docker_cmd():  # pragma: windows no cover
         # https://docs.docker.com/engine/reference/commandline/run/#mount-volumes-from-container-volumes-from
         # The `Z` option tells Docker to label the content with a private
         # unshared label. Only the current container can use a private volume.
-        '-v', '{}:/src:rw,Z'.format(os.getcwd()),
-        '--workdir', '/src',
+        '-v', '{}:/src:rw,Z'.format(superproject_dir),
+        '--workdir', os.path.abspath(os.path.join('/src', project_relpath)),
     )