1 files changed, 40 insertions, 0 deletions

diff --git a/vendor/github.com/hashicorp/terraform/states/statefile/marshal_equal.go b/vendor/github.com/hashicorp/terraform/states/statefile/marshal_equal.go
new file mode 100644
index 0000000..4948b39
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/states/statefile/marshal_equal.go
@@ -0,0 +1,40 @@
+package statefile
+
+import (
+        "bytes"
+
+        "github.com/hashicorp/terraform/states"
+)
+
+// StatesMarshalEqual returns true if and only if the two given states have
+// an identical (byte-for-byte) statefile representation.
+//
+// This function compares only the portions of the state that are persisted
+// in state files, so for example it will not return false if the only
+// differences between the two states are local values or descendent module
+// outputs.
+func StatesMarshalEqual(a, b *states.State) bool {
+        var aBuf bytes.Buffer
+        var bBuf bytes.Buffer
+
+        // nil states are not valid states, and so they can never martial equal.
+        if a == nil || b == nil {
+                return false
+        }
+
+        // We write here some temporary files that have no header information
+        // populated, thus ensuring that we're only comparing the state itself
+        // and not any metadata.
+        err := Write(&File{State: a}, &aBuf)
+        if err != nil {
+                // Should never happen, because we're writing to an in-memory buffer
+                panic(err)
+        }
+        err = Write(&File{State: b}, &bBuf)
+        if err != nil {
+                // Should never happen, because we're writing to an in-memory buffer
+                panic(err)
+        }
+
+        return bytes.Equal(aBuf.Bytes(), bBuf.Bytes())
+}