Add support for docker run --tmpfs flag.

Signed-off-by: Philip Walls <pawalls@rabidgeek.com>

compose/config/config.py

@@ -591,7 +591,7 @@ def process_service(service_config):
     if 'extra_hosts' in service_dict:
         service_dict['extra_hosts'] = parse_extra_hosts(service_dict['extra_hosts'])
 
-    for field in ['dns', 'dns_search']:
+    for field in ['dns', 'dns_search', 'tmpfs']:
         if field in service_dict:
             service_dict[field] = to_list(service_dict[field])
 
@@ -730,7 +730,7 @@ def merge_service_dicts(base, override, version):
     ]:
         md.merge_field(field, operator.add, default=[])
 
-    for field in ['dns', 'dns_search', 'env_file']:
+    for field in ['dns', 'dns_search', 'env_file', 'tmpfs']:
         md.merge_field(field, merge_list_or_string)
 
     for field in set(ALLOWED_KEYS) - set(md):

compose/config/config_schema_v1.json

@@ -104,6 +104,7 @@
         "shm_size": {"type": ["number", "string"]},
         "stdin_open": {"type": "boolean"},
         "stop_signal": {"type": "string"},
+        "tmpfs": {"$ref": "#/definitions/string_or_list"},
         "tty": {"type": "boolean"},
         "ulimits": {
           "type": "object",

compose/config/config_schema_v2.0.json

@@ -184,6 +184,7 @@
         "shm_size": {"type": ["number", "string"]},
         "stdin_open": {"type": "boolean"},
         "stop_signal": {"type": "string"},
+        "tmpfs": {"$ref": "#/definitions/string_or_list"},
         "tty": {"type": "boolean"},
         "ulimits": {
           "type": "object",

compose/service.py

@@ -668,6 +668,7 @@ class Service(object):
             cgroup_parent=options.get('cgroup_parent'),
             cpu_quota=options.get('cpu_quota'),
             shm_size=options.get('shm_size'),
+            tmpfs=options.get('tmpfs'),
         )
 
     def build(self, no_cache=False, pull=False, force_rm=False):