From d4a9ff4d1f044d17040fa0b4b93ea93a8da4888e Mon Sep 17 00:00:00 2001
From: Edgar Geier <egeier@rhrk.uni-kl.de>
Date: Thu, 25 Jul 2019 11:20:03 +0200
Subject: [PATCH] Simplify docker user fallback implementation and test

---
 pre_commit/languages/docker.py | 17 ++++-------------
 tests/languages/docker_test.py | 17 +++++++----------
 2 files changed, 11 insertions(+), 23 deletions(-)

diff --git a/pre_commit/languages/docker.py b/pre_commit/languages/docker.py
index 8f7c72df..4517050b 100644
--- a/pre_commit/languages/docker.py
+++ b/pre_commit/languages/docker.py
@@ -14,8 +14,6 @@ from pre_commit.util import cmd_output
 
 ENVIRONMENT_DIR = 'docker'
 PRE_COMMIT_LABEL = 'PRE_COMMIT'
-FALLBACK_UID = 1000
-FALLBACK_GID = 1000
 get_default_version = helpers.basic_get_default_version
 healthy = helpers.basic_healthy
 
@@ -75,25 +73,18 @@ def install_environment(
         os.mkdir(directory)
 
 
-def getuid():  # pragma: windows no cover
+def get_docker_user():  # pragma: windows no cover
     try:
-        return os.getuid()
+        return '{}:{}'.format(os.getuid(), os.getgid())
     except AttributeError:
-        return FALLBACK_UID
-
-
-def getgid():  # pragma: windows no cover
-    try:
-        return os.getgid()
-    except AttributeError:
-        return FALLBACK_GID
+        return '1000:1000'
 
 
 def docker_cmd():  # pragma: windows no cover
     return (
         'docker', 'run',
         '--rm',
-        '-u', '{}:{}'.format(getuid(), getgid()),
+        '-u', get_docker_user(),
         # 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.
diff --git a/tests/languages/docker_test.py b/tests/languages/docker_test.py
index a4cfbac1..1a96e69d 100644
--- a/tests/languages/docker_test.py
+++ b/tests/languages/docker_test.py
@@ -15,15 +15,12 @@ def test_docker_is_running_process_error():
         assert docker.docker_is_running() is False
 
 
-def test_docker_fallback_uid():
+def test_docker_fallback_user():
     def invalid_attribute():
         raise AttributeError
-    with mock.patch('os.getuid', invalid_attribute, create=True):
-        assert docker.getuid() == docker.FALLBACK_UID
-
-
-def test_docker_fallback_gid():
-    def invalid_attribute():
-        raise AttributeError
-    with mock.patch('os.getgid', invalid_attribute, create=True):
-        assert docker.getgid() == docker.FALLBACK_GID
+    with mock.patch.multiple(
+        'os', create=True,
+        getuid=invalid_attribute,
+        getgid=invalid_attribute,
+    ):
+        assert docker.get_docker_user() == '1000:1000'