adding "fig pull [SERVICE]" to pull service images

Fixes #158

Signed-off-by: Luke Amdor <luke.amdor@gmail.com>

fig/cli/main.py

@@ -85,6 +85,7 @@ class TopLevelCommand(Command):
       kill      Kill containers
       logs      View output from containers
       ps        List containers
+      pull      Pulls service images
       rm        Remove stopped containers
       run       Run a one-off command
       scale     Set number of containers for a service
@@ -182,6 +183,14 @@ class TopLevelCommand(Command):
                 ])
             print(Formatter().table(headers, rows))
 
+    def pull(self, project, options):
+        """
+        Pulls images for services.
+
+        Usage: pull [SERVICE...]
+        """
+        project.pull(service_names=options['SERVICE'])
+
     def rm(self, project, options):
         """
         Remove stopped service containers.

fig/project.py

@@ -176,6 +176,10 @@ class Project(object):
 
         return running_containers
 
+    def pull(self, service_names=None):
+        for service in self.get_services(service_names, include_links=True):
+            service.pull()
+
     def remove_stopped(self, service_names=None, **options):
         for service in self.get_services(service_names):
             service.remove_stopped(**options)

fig/service.py

@@ -401,6 +401,11 @@ class Service(object):
                 return False
         return True
 
+    def pull(self):
+        if 'image' in self.options:
+            log.info('Pulling %s (%s)...' % (self.name, self.options.get('image')))
+            self.client.pull(self.options.get('image'))
+
 
 NAME_RE = re.compile(r'^([^_]+)_([^_]+)_(run_)?(\d+)$')