move dependencies to vendor

vendor/github.com/docker/libtrust/trustgraph/graph.go

@@ -0,0 +1,50 @@
+package trustgraph
+
+import "github.com/docker/libtrust"
+
+// TrustGraph represents a graph of authorization mapping
+// public keys to nodes and grants between nodes.
+type TrustGraph interface {
+	// Verifies that the given public key is allowed to perform
+	// the given action on the given node according to the trust
+	// graph.
+	Verify(libtrust.PublicKey, string, uint16) (bool, error)
+
+	// GetGrants returns an array of all grant chains which are used to
+	// allow the requested permission.
+	GetGrants(libtrust.PublicKey, string, uint16) ([][]*Grant, error)
+}
+
+// Grant represents a transfer of permission from one part of the
+// trust graph to another. This is the only way to delegate
+// permission between two different sub trees in the graph.
+type Grant struct {
+	// Subject is the namespace being granted
+	Subject string
+
+	// Permissions is a bit map of permissions
+	Permission uint16
+
+	// Grantee represents the node being granted
+	// a permission scope.  The grantee can be
+	// either a namespace item or a key id where namespace
+	// items will always start with a '/'.
+	Grantee string
+
+	// statement represents the statement used to create
+	// this object.
+	statement *Statement
+}
+
+// Permissions
+//  Read node 0x01 (can read node, no sub nodes)
+//  Write node 0x02 (can write to node object, cannot create subnodes)
+//  Read subtree 0x04 (delegates read to each sub node)
+//  Write subtree 0x08 (delegates write to each sub node, included create on the subject)
+//
+// Permission shortcuts
+// ReadItem = 0x01
+// WriteItem = 0x03
+// ReadAccess = 0x07
+// WriteAccess = 0x0F
+// Delegate = 0x0F