Save Docker image hash in RTD environment.json file (#3880)

* Save docker image hash to consider when auto wiping the environment (#3793)

* Remove obsolete code

Now, we can access `self.config.build_image` directly.

* Move container_image selection to the init

At initialization time we have the project and we already know if the
project has the build image override so we can decide at that point
and save it as a instance attribute.

Then we can use this values from other places inside the same class.

* Save Docker Image hash in readthedocs-environment.json

The hash is used to know if the environment is obsolete and auto-wipe
it if necessary.

* Simplify the class naming

* Save the image hash in the json file

* Lint

* Remove invalid properties from YAML config in tests

* Add test for save_environment_json

* Improve docstring

* Handle obsolete cases better

* when the file is corrupted or we don't have access, we return that
  it's OBSOLETE

* when there is a new setting that we need to compare and it's not in
  the JSON file, we return OBSOLETE

* Test case for build image in the config but not in the JSON

readthedocs/doc_builder/environments.py

@@ -625,6 +625,8 @@ def __init__(self, *args, **kwargs):
         )
         if self.config and self.config.build_image:
             self.container_image = self.config.build_image
+        if self.project.container_image:
+            self.container_image = self.project.container_image
         if self.project.container_mem_limit:
             self.container_mem_limit = self.project.container_mem_limit
         if self.project.container_time_limit:
@@ -786,6 +788,13 @@ def get_container_host_config(self):
             mem_limit=self.container_mem_limit,
         )
 
+    @property
+    def image_hash(self):
+        """Return the hash of the Docker image."""
+        client = self.get_client()
+        image_metadata = client.inspect_image(self.container_image)
+        return image_metadata.get('Id')
+
     @property
     def container_id(self):
         """Return id of container if it is valid."""
@@ -828,13 +837,13 @@ def update_build_from_container_state(self):
     def create_container(self):
         """Create docker container."""
         client = self.get_client()
-        image = self.container_image
-        if self.project.container_image:
-            image = self.project.container_image
         try:
-            log.info('Creating Docker container: image=%s', image)
+            log.info(
+                'Creating Docker container: image=%s',
+                self.container_image,
+            )
             self.container = client.create_container(
-                image=image,
+                image=self.container_image,
                 command=('/bin/sh -c "sleep {time}; exit {exit}"'
                          .format(time=self.container_time_limit,
                                  exit=DOCKER_TIMEOUT_EXIT_CODE)),

readthedocs/doc_builder/python_environments.py

@@ -109,12 +109,14 @@ def environment_json_path(self):
     @property
     def is_obsolete(self):
         """
-        Determine if the Python version of the venv obsolete.
+        Determine if the environment is obsolete for different reasons.
 
         It checks the the data stored at ``readthedocs-environment.json`` and
-        compares it against the Python version in the project version to be
-        built and the Docker image used to create the venv against the one in
-        the project version config.
+        compares it with the one to be used. In particular:
+
+        * the Python version (e.g. 2.7, 3, 3.6, etc)
+        * the Docker image name
+        * the Docker image hash
 
         :returns: ``True`` when it's obsolete and ``False`` otherwise
 
@@ -129,35 +131,43 @@ def is_obsolete(self):
         try:
             with open(self.environment_json_path(), 'r') as fpath:
                 environment_conf = json.load(fpath)
-            env_python_version = environment_conf['python']['version']
-            env_build_image = environment_conf['build']['image']
         except (IOError, TypeError, KeyError, ValueError):
-            log.error('Unable to read/parse readthedocs-environment.json file')
-            return False
-
-        # TODO: remove getattr when https://github.com/rtfd/readthedocs.org/pull/3339 got merged
-        build_image = getattr(self.config, 'build_image', self.version.project.container_image) or DOCKER_IMAGE  # noqa
-
+            log.warning('Unable to read/parse readthedocs-environment.json file')
+            # We remove the JSON file here to avoid cycling over time with a
+            # corrupted file.
+            os.remove(self.environment_json_path())
+            return True
+
+        env_python = environment_conf.get('python', {})
+        env_build = environment_conf.get('build', {})
+
+        # By defaulting non-existent options to ``None`` we force a wipe since
+        # we don't know how the environment was created
+        env_python_version = env_python.get('version', None)
+        env_build_image = env_build.get('image', None)
+        env_build_hash = env_build.get('hash', None)
+
+        build_image = self.config.build_image or DOCKER_IMAGE
         # If the user define the Python version just as a major version
         # (e.g. ``2`` or ``3``) we won't know exactly which exact version was
         # used to create the venv but we can still compare it against the new
         # one coming from the project version config.
         return any([
             env_python_version != self.config.python_full_version,
             env_build_image != build_image,
+            env_build_hash != self.build_env.image_hash,
         ])
 
     def save_environment_json(self):
         """Save on disk Python and build image versions used to create the venv."""
-        # TODO: remove getattr when https://github.com/rtfd/readthedocs.org/pull/3339 got merged
-        build_image = getattr(self.config, 'build_image', self.version.project.container_image) or DOCKER_IMAGE  # noqa
-
+        build_image = self.config.build_image or DOCKER_IMAGE
         data = {
             'python': {
                 'version': self.config.python_full_version,
             },
             'build': {
                 'image': build_image,
+                'hash': self.build_env.image_hash,
             },
         }
 

readthedocs/rtd_tests/tests/test_doc_building.py

@@ -9,7 +9,9 @@
     absolute_import, division, print_function, unicode_literals)
 
 import os.path
+import json
 import re
+import tempfile
 import uuid
 from builtins import str
 
@@ -837,14 +839,54 @@ def test_command_oom_kill(self):
             u'Command killed due to excessive memory consumption\n')
 
 
-
-
-class TestAutoWipeEnvironment(TestCase):
+class AutoWipeEnvironmentBase(object):
     fixtures = ['test_data']
+    build_env_class = None
 
     def setUp(self):
         self.pip = Project.objects.get(slug='pip')
         self.version = self.pip.versions.get(slug='0.8')
+        self.build_env = self.build_env_class(
+            project=self.pip,
+            version=self.version,
+            build={'id': DUMMY_BUILD_ID},
+        )
+
+    def test_save_environment_json(self):
+        config_data = {
+            'build': {
+                'image': '2.0',
+            },
+            'python': {
+                'version': 2.7,
+            },
+        }
+        yaml_config = create_load(config_data)()[0]
+        config = ConfigWrapper(version=self.version, yaml_config=yaml_config)
+
+        python_env = Virtualenv(
+            version=self.version,
+            build_env=self.build_env,
+            config=config,
+        )
+
+        with patch(
+                'readthedocs.doc_builder.python_environments.PythonEnvironment.environment_json_path',
+                return_value=tempfile.mktemp(suffix='envjson'),
+        ):
+            python_env.save_environment_json()
+            json_data = json.load(open(python_env.environment_json_path()))
+
+        expected_data = {
+            'build': {
+                'image': 'readthedocs/build:2.0',
+                'hash': 'a1b2c3',
+            },
+            'python': {
+                'version': 2.7,
+            },
+        }
+        self.assertDictEqual(json_data, expected_data)
 
     def test_is_obsolete_without_env_json_file(self):
         yaml_config = create_load()()[0]
@@ -854,7 +896,7 @@ def test_is_obsolete_without_env_json_file(self):
             exists.return_value = False
             python_env = Virtualenv(
                 version=self.version,
-                build_env=None,
+                build_env=self.build_env,
                 config=config,
             )
 
@@ -868,7 +910,7 @@ def test_is_obsolete_with_invalid_env_json_file(self):
             exists.return_value = True
             python_env = Virtualenv(
                 version=self.version,
-                build_env=None,
+                build_env=self.build_env,
                 config=config,
             )
 
@@ -888,10 +930,10 @@ def test_is_obsolete_with_json_different_python_version(self):
 
         python_env = Virtualenv(
             version=self.version,
-            build_env=None,
+            build_env=self.build_env,
             config=config,
         )
-        env_json_data = '{"build": {"image": "readthedocs/build:2.0"}, "python": {"version": 3.5}}'
+        env_json_data = '{"build": {"image": "readthedocs/build:2.0", "hash": "a1b2c3"}, "python": {"version": 3.5}}'  # noqa
         with patch('os.path.exists') as exists, patch('readthedocs.doc_builder.python_environments.open', mock_open(read_data=env_json_data)) as _open:  # noqa
             exists.return_value = True
             self.assertTrue(python_env.is_obsolete)
@@ -910,10 +952,10 @@ def test_is_obsolete_with_json_different_build_image(self):
 
         python_env = Virtualenv(
             version=self.version,
-            build_env=None,
+            build_env=self.build_env,
             config=config,
         )
-        env_json_data = '{"build": {"image": "readthedocs/build:2.0"}, "python": {"version": 2.7}}'
+        env_json_data = '{"build": {"image": "readthedocs/build:2.0", "hash": "a1b2c3"}, "python": {"version": 2.7}}'  # noqa
         with patch('os.path.exists') as exists, patch('readthedocs.doc_builder.python_environments.open', mock_open(read_data=env_json_data)) as _open:  # noqa
             exists.return_value = True
             self.assertTrue(python_env.is_obsolete)
@@ -936,10 +978,10 @@ def test_is_obsolete_with_project_different_build_image(self):
 
         python_env = Virtualenv(
             version=self.version,
-            build_env=None,
+            build_env=self.build_env,
             config=config,
         )
-        env_json_data = '{"build": {"image": "readthedocs/build:2.0"}, "python": {"version": 2.7}}'
+        env_json_data = '{"build": {"image": "readthedocs/build:2.0", "hash": "a1b2c3"}, "python": {"version": 2.7}}'  # noqa
         with patch('os.path.exists') as exists, patch('readthedocs.doc_builder.python_environments.open', mock_open(read_data=env_json_data)) as _open:  # noqa
             exists.return_value = True
             self.assertTrue(python_env.is_obsolete)
@@ -958,10 +1000,82 @@ def test_is_obsolete_with_json_same_data_as_version(self):
 
         python_env = Virtualenv(
             version=self.version,
-            build_env=None,
+            build_env=self.build_env,
             config=config,
         )
-        env_json_data = '{"build": {"image": "readthedocs/build:2.0"}, "python": {"version": 3.5}}'
+        env_json_data = '{"build": {"image": "readthedocs/build:2.0", "hash": "a1b2c3"}, "python": {"version": 3.5}}'  # noqa
         with patch('os.path.exists') as exists, patch('readthedocs.doc_builder.python_environments.open', mock_open(read_data=env_json_data)) as _open:  # noqa
             exists.return_value = True
             self.assertFalse(python_env.is_obsolete)
+
+    def test_is_obsolete_with_json_different_build_hash(self):
+        config_data = {
+            'build': {
+                'image': '2.0',
+            },
+            'python': {
+                'version': 2.7,
+            },
+        }
+        yaml_config = create_load(config_data)()[0]
+        config = ConfigWrapper(version=self.version, yaml_config=yaml_config)
+
+        # Set container_image manually
+        self.pip.container_image = 'readthedocs/build:2.0'
+        self.pip.save()
+
+        python_env = Virtualenv(
+            version=self.version,
+            build_env=self.build_env,
+            config=config,
+        )
+        env_json_data = '{"build": {"image": "readthedocs/build:2.0", "hash": "foo"}, "python": {"version": 2.7}}'  # noqa
+        with patch('os.path.exists') as exists, patch('readthedocs.doc_builder.python_environments.open', mock_open(read_data=env_json_data)) as _open:  # noqa
+            exists.return_value = True
+            self.assertTrue(python_env.is_obsolete)
+
+    def test_is_obsolete_with_json_missing_build_hash(self):
+        config_data = {
+            'build': {
+                'image': '2.0',
+                'hash': 'a1b2c3',
+            },
+            'python': {
+                'version': 2.7,
+            },
+        }
+        yaml_config = create_load(config_data)()[0]
+        config = ConfigWrapper(version=self.version, yaml_config=yaml_config)
+
+        # Set container_image manually
+        self.pip.container_image = 'readthedocs/build:2.0'
+        self.pip.save()
+
+        python_env = Virtualenv(
+            version=self.version,
+            build_env=self.build_env,
+            config=config,
+        )
+        env_json_data = '{"build": {"image": "readthedocs/build:2.0"}, "python": {"version": 2.7}}'  # noqa
+        with patch('os.path.exists') as exists, patch('readthedocs.doc_builder.python_environments.open', mock_open(read_data=env_json_data)) as _open:  # noqa
+            exists.return_value = True
+            self.assertTrue(python_env.is_obsolete)
+
+
+@patch(
+    'readthedocs.doc_builder.environments.DockerBuildEnvironment.image_hash',
+    PropertyMock(return_value='a1b2c3'),
+)
+class AutoWipeDockerBuildEnvironmentTest(AutoWipeEnvironmentBase, TestCase):
+    build_env_class = DockerBuildEnvironment
+
+
+@pytest.mark.xfail(
+    reason='PythonEnvironment needs to be refactored to do not rely on DockerBuildEnvironment',
+)
+@patch(
+    'readthedocs.doc_builder.environments.DockerBuildEnvironment.image_hash',
+    PropertyMock(return_value='a1b2c3'),
+)
+class AutoWipeLocalBuildEnvironmentTest(AutoWipeEnvironmentBase, TestCase):
+    build_env_class = LocalBuildEnvironment