Add `--no-cache` option to `fig build` (Closes #152)

Signed-off-by: Mark Steve Samson <hello@marksteve.com>

fig/cli/main.py

@@ -103,9 +103,13 @@ class TopLevelCommand(Command):
         e.g. `figtest_db`. If you change a service's `Dockerfile` or the
         contents of its build directory, you can run `fig build` to rebuild it.
 
-        Usage: build [SERVICE...]
+        Usage: build [options] [SERVICE...]
+
+        Options:
+            --no-cache  Do not use cache when building the image.
         """
-        self.project.build(service_names=options['SERVICE'])
+        no_cache = bool(options.get('--no-cache', False))
+        self.project.build(service_names=options['SERVICE'], no_cache=no_cache)
 
     def help(self, options):
         """

fig/project.py

@@ -154,10 +154,10 @@ class Project(object):
         for service in reversed(self.get_services(service_names)):
             service.kill(**options)
 
-    def build(self, service_names=None, **options):
+    def build(self, service_names=None, no_cache=False):
         for service in self.get_services(service_names):
             if service.can_be_built():
-                service.build(**options)
+                service.build(no_cache)
             else:
                 log.info('%s uses an image, skipping' % service.name)
 

fig/service.py

@@ -356,14 +356,15 @@ class Service(object):
 
         return container_options
 
-    def build(self):
+    def build(self, no_cache=False):
         log.info('Building %s...' % self.name)
 
         build_output = self.client.build(
             self.options['build'],
             tag=self._build_tag_name(),
             stream=True,
-            rm=True
+            rm=True,
+            nocache=no_cache,
         )
 
         try: