Ability to change working directory via a CLI flag

Signed-off-by: Dimitar Bonev <dimitar.bonev@gmail.com>

compose/cli/command.py

@@ -33,7 +33,8 @@ def project_from_options(project_dir, options):
         verbose=options.get('--verbose'),
         host=host,
         tls_config=tls_config_from_options(options),
-        environment=environment
+        environment=environment,
+        override_dir=options.get('--project-directory'),
     )
 
 
@@ -93,10 +94,10 @@ def get_client(environment, verbose=False, version=None, tls_config=None, host=N
 
 
 def get_project(project_dir, config_path=None, project_name=None, verbose=False,
-                host=None, tls_config=None, environment=None):
+                host=None, tls_config=None, environment=None, override_dir=None):
     if not environment:
         environment = Environment.from_env_file(project_dir)
-    config_details = config.find(project_dir, config_path, environment)
+    config_details = config.find(project_dir, config_path, environment, override_dir)
     project_name = get_project_name(
         config_details.working_dir, project_name, environment
     )

compose/cli/main.py

@@ -168,6 +168,8 @@ class TopLevelCommand(object):
       --skip-hostname-check       Don't check the daemon's hostname against the name specified
                                   in the client certificate (for example if your docker host
                                   is an IP address)
+      --project-directory PATH    Specify an alternate working directory
+                                  (default: the path of the compose file)
 
     Commands:
       build              Build or rebuild services

compose/config/config.py

@@ -235,10 +235,10 @@ class ServiceConfig(namedtuple('_ServiceConfig', 'working_dir filename name conf
             config)
 
 
-def find(base_dir, filenames, environment):
+def find(base_dir, filenames, environment, override_dir='.'):
     if filenames == ['-']:
         return ConfigDetails(
-            os.getcwd(),
+            os.path.abspath(override_dir),
             [ConfigFile(None, yaml.safe_load(sys.stdin))],
             environment
         )
@@ -250,7 +250,7 @@ def find(base_dir, filenames, environment):
 
     log.debug("Using configuration files: {}".format(",".join(filenames)))
     return ConfigDetails(
-        os.path.dirname(filenames[0]),
+        override_dir or os.path.dirname(filenames[0]),
         [ConfigFile.from_filename(f) for f in filenames],
         environment
     )

tests/acceptance/cli_test.py

@@ -107,6 +107,7 @@ class CLITestCase(DockerClientTestCase):
     def setUp(self):
         super(CLITestCase, self).setUp()
         self.base_dir = 'tests/fixtures/simple-composefile'
+        self.override_dir = None
 
     def tearDown(self):
         if self.base_dir:
@@ -129,7 +130,7 @@ class CLITestCase(DockerClientTestCase):
     def project(self):
         # Hack: allow project to be overridden
         if not hasattr(self, '_project'):
-            self._project = get_project(self.base_dir)
+            self._project = get_project(self.base_dir, override_dir=self.override_dir)
         return self._project
 
     def dispatch(self, options, project_options=None, returncode=0):
@@ -518,6 +519,23 @@ class CLITestCase(DockerClientTestCase):
             },
         }
 
+    def test_build_override_dir(self):
+        self.base_dir = 'tests/fixtures/build-path-override-dir'
+        self.override_dir = os.path.abspath('tests/fixtures')
+        result = self.dispatch([
+            '--project-directory', self.override_dir,
+            'build'])
+
+        assert 'Successfully built' in result.stdout
+
+    def test_build_override_dir_invalid_path(self):
+        config_path = os.path.abspath('tests/fixtures/build-path-override-dir/docker-compose.yml')
+        result = self.dispatch([
+            '-f', config_path,
+            'build'], returncode=1)
+
+        assert 'does not exist, is not accessible, or is not a valid URL' in result.stderr
+
     def test_create(self):
         self.dispatch(['create'])
         service = self.project.get_service('simple')

tests/fixtures/build-path-override-dir/docker-compose.yml

@@ -0,0 +1,2 @@
+foo:
+  build: ./build-ctx/

tests/unit/config/config_test.py

@@ -2875,9 +2875,9 @@ class EnvTest(unittest.TestCase):
             set([VolumeSpec.parse('/opt/tmp:/opt/host/tmp')]))
 
 
-def load_from_filename(filename):
+def load_from_filename(filename, override_dir=None):
     return config.load(
-        config.find('.', [filename], Environment.from_env_file('.'))
+        config.find('.', [filename], Environment.from_env_file('.'), override_dir=override_dir)
     ).services
 
 
@@ -3443,6 +3443,12 @@ class BuildPathTest(unittest.TestCase):
         service_dict = load_from_filename('tests/fixtures/build-path/docker-compose.yml')
         self.assertEqual(service_dict, [{'name': 'foo', 'build': {'context': self.abs_context_path}}])
 
+    def test_from_file_override_dir(self):
+        override_dir = os.path.join(os.getcwd(), 'tests/fixtures/')
+        service_dict = load_from_filename(
+            'tests/fixtures/build-path-override-dir/docker-compose.yml', override_dir=override_dir)
+        self.assertEquals(service_dict, [{'name': 'foo', 'build': {'context': self.abs_context_path}}])
+
     def test_valid_url_in_build_path(self):
         valid_urls = [
             'git://github.com/docker/docker',