Flag to skip all pull errors when pulling images.

Signed-off-by: Vojta Orgon <villlem@gmail.com>

compose/cli/main.py

@@ -270,6 +270,7 @@ class TopLevelCommand(Command):
         Usage: pull [options] [SERVICE...]
 
         Options:
+            --ignore-pull-failures  Pull what it can and ignores images with pull failures.
             --allow-insecure-ssl    Deprecated - no effect.
         """
         if options['--allow-insecure-ssl']:
@@ -277,6 +278,7 @@ class TopLevelCommand(Command):
 
         project.pull(
             service_names=options['SERVICE'],
+            ignore_pull_failures=options.get('--ignore-pull-failures')
         )
 
     def rm(self, project, options):

compose/project.py

@@ -311,9 +311,9 @@ class Project(object):
 
         return plans
 
-    def pull(self, service_names=None):
+    def pull(self, service_names=None, ignore_pull_failures=False):
         for service in self.get_services(service_names, include_deps=True):
-            service.pull()
+            service.pull(ignore_pull_failures)
 
     def containers(self, service_names=None, stopped=False, one_off=False):
         if service_names:

compose/service.py

@@ -769,7 +769,7 @@ class Service(object):
                 return True
         return False
 
-    def pull(self):
+    def pull(self, ignore_pull_failures=False):
         if 'image' not in self.options:
             return
 
@@ -781,7 +781,14 @@ class Service(object):
             tag=tag,
             stream=True,
         )
-        stream_output(output, sys.stdout)
+
+        try:
+            stream_output(output, sys.stdout)
+        except StreamOutputError as e:
+            if not ignore_pull_failures:
+                raise
+            else:
+                log.error(six.text_type(e))
 
 
 class Net(object):