Make "reason" a common opcode attribute

The "reason" attribute will be common to many opcodes.
This patch factors it out so that it will be possible for the next commits
to use it without code duplication.

Signed-off-by: Michele Tartara <mtartara@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>

diff --git a/lib/opcodes.py b/lib/opcodes.py
index 59af3f6..faffbac 100644 (file)
--- a/lib/opcodes.py
+++ b/lib/opcodes.py
@@ -184,6 +184,16 @@ _PTargetGroups = \
   ("target_groups", None, ht.TMaybeListOf(ht.TNonEmptyString),
    "Destination group names or UUIDs (defaults to \"all but current group\")")
 
+# The reason for a state change of an instance
+_PReason = \
+  ("reason", (constants.INSTANCE_REASON_SOURCE_UNKNOWN, None),
+   ht.TAnd(ht.TIsLength(2),
+           ht.TItems([
+             ht.TElemOf(constants.INSTANCE_REASON_SOURCES),
+             ht.TMaybeString,
+           ])),
+   "The reason why the reboot is happening")
+
 #: OP_ID conversion regular expression
 _OPID_RE = re.compile("([a-z])([A-Z])")
 
@@ -1451,13 +1461,7 @@ class OpInstanceReboot(OpCode):
      "Whether to start the instance even if secondary disks are failing"),
     ("reboot_type", ht.NoDefault, ht.TElemOf(constants.REBOOT_TYPES),
      "How to reboot instance"),
-    ("reason", (constants.INSTANCE_REASON_SOURCE_UNKNOWN, None),
-     ht.TAnd(ht.TIsLength(2),
-             ht.TItems([
-               ht.TElemOf(constants.INSTANCE_REASON_SOURCES),
-               ht.TMaybeString,
-             ])),
-     "The reason why the reboot is happening"),
+    _PReason,
     ]
   OP_RESULT = ht.TNone