Add deploy --evaluate-only

domenkozar · domenkozar · commit efa8c702b90c · 2016-11-23T17:08:16.000+01:00
diff --git a/nixops/deployment.py b/nixops/deployment.py
@@ -854,14 +854,17 @@ def evaluate_active(self, include=[], exclude=[], kill_obsolete=False):
             self._destroy_resources(include=to_destroy)
 
 
-    def _deploy(self, dry_run=False, build_only=False, create_only=False, copy_only=False,
+    def _deploy(self, dry_run=False, build_only=False, create_only=False, copy_only=False, evaluate_only=False,
                 include=[], exclude=[], check=False, kill_obsolete=False,
                 allow_reboot=False, allow_recreate=False, force_reboot=False,
                 max_concurrent_copy=5, sync=True, always_activate=False, repair=False, dry_activate=False):
         """Perform the deployment defined by the deployment specification."""
 
         self.evaluate_active(include, exclude, kill_obsolete)
 
+        if evaluate_only:
+            return
+
         # Assign each resource an index if it doesn't have one.
         for r in self.active_resources.itervalues():
             if r.index == None:
diff --git a/scripts/nixops b/scripts/nixops
@@ -360,7 +360,8 @@ def op_deploy():
     depl = open_deployment()
     if args.confirm:
         depl.logger.set_autoresponse("y")
-    depl.deploy(dry_run=args.dry_run, build_only=args.build_only,
+    depl.deploy(dry_run=args.dry_run, evaluate_only=args.evaluate_only,
+                build_only=args.build_only,
                 create_only=args.create_only, copy_only=args.copy_only,
                 include=args.include or [], exclude=args.exclude or [],
                 check=args.check, kill_obsolete=args.kill_obsolete,
@@ -768,6 +769,7 @@ subparser.add_argument('--kill-obsolete', '-k', action='store_true', help='kill
 subparser.add_argument('--dry-run', action='store_true', help='show what will be built')
 subparser.add_argument('--dry-activate', action='store_true', help='show what will be activated on the machines in the network')
 subparser.add_argument('--repair', action='store_true', help='use --repair when calling nix-build (slow)')
+subparser.add_argument('--evaluate-only', action='store_true', help='only call nix-instantiate and exit')
 subparser.add_argument('--build-only', action='store_true', help='build only; do not perform deployment actions')
 subparser.add_argument('--create-only', action='store_true', help='exit after creating missing machines')
 subparser.add_argument('--copy-only', action='store_true', help='exit after copying closures')
