New charm revision updater api

state/charm.go

 // Copyright 2012, 2013 Canonical Ltd.
 // Licensed under the AGPLv3, see LICENCE file for details.
 
 package state
 
 import (
         "net/url"
 
         "launchpad.net/juju-core/charm"
 )
 
 // charmDoc represents the internal state of a charm in MongoDB.
 type charmDoc struct {
         URL           *charm.URL `bson:"_id"`
         Meta          *charm.Meta
         Config        *charm.Config
         BundleURL     *url.URL
         BundleSha256  string
         PendingUpload bool
+        Placeholder   bool
 }
 
 // Charm represents the state of a charm in the environment.
 type Charm struct {
         st  *State
         doc charmDoc
 }
 
 func newCharm(st *State, cdoc *charmDoc) (*Charm, error) {
         return &Charm{st: st, doc: *cdoc}, nil
@@ skipping 34 matching lines @@
 // BundleSha256 returns the SHA256 digest of the charm bundle bytes.
 func (c *Charm) BundleSha256() string {
         return c.doc.BundleSha256
 }
 
 // IsUploaded returns whether the charm has been uploaded to the
 // provider storage.
 func (c *Charm) IsUploaded() bool {
         return !c.doc.PendingUpload
 }
+
+// IsPlaceholder returns whether the charm record is just a placeholder
+// rather than representing a deployed charm.
+func (c *Charm) IsPlaceholder() bool {
+        return c.doc.Placeholder
+}