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It can be accessed and reviewed at: https://github.com/lxc/lxd/pull/4794

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=== Description (from pull-request) ===
New fields that are added to the protobuf definitions need to be optional so to
not break migration between different LXD versions.

Closes #4780.

Signed-off-by: Christian Brauner <christian.brau...@ubuntu.com>
From 1c93d2cdeb275a87c0c3c9495ad65b257fce7e1c Mon Sep 17 00:00:00 2001
From: Christian Brauner <christian.brau...@ubuntu.com>
Date: Mon, 16 Jul 2018 13:24:50 +0200
Subject: [PATCH] migration: fix cross version migrations

New fields that are added to the protobuf definitions need to be optional so to
not break migration between different LXD versions.

Closes #4780.

Signed-off-by: Christian Brauner <christian.brau...@ubuntu.com>
---
 lxd/migration/migrate.pb.go | 118 ++++++++++++++++++++++----------------------
 lxd/migration/migrate.proto |   4 +-
 2 files changed, 61 insertions(+), 61 deletions(-)

diff --git a/lxd/migration/migrate.pb.go b/lxd/migration/migrate.pb.go
index ad752ff8ed..13e68f3067 100644
--- a/lxd/migration/migrate.pb.go
+++ b/lxd/migration/migrate.pb.go
@@ -220,8 +220,8 @@ type Snapshot struct {
        LocalDevices     []*Device `protobuf:"bytes,5,rep,name=localDevices" 
json:"localDevices,omitempty"`
        Architecture     *int32    `protobuf:"varint,6,req,name=architecture" 
json:"architecture,omitempty"`
        Stateful         *bool     `protobuf:"varint,7,req,name=stateful" 
json:"stateful,omitempty"`
-       CreationDate     *int64    
`protobuf:"varint,8,req,name=creation_date,json=creationDate" 
json:"creation_date,omitempty"`
-       LastUsedDate     *int64    
`protobuf:"varint,9,req,name=last_used_date,json=lastUsedDate" 
json:"last_used_date,omitempty"`
+       CreationDate     *int64    
`protobuf:"varint,8,opt,name=creation_date,json=creationDate" 
json:"creation_date,omitempty"`
+       LastUsedDate     *int64    
`protobuf:"varint,9,opt,name=last_used_date,json=lastUsedDate" 
json:"last_used_date,omitempty"`
        XXX_unrecognized []byte    `json:"-"`
 }
 
@@ -583,64 +583,64 @@ func init() {
 func init() { proto.RegisterFile("lxd/migration/migrate.proto", 
fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-       // 935 bytes of a gzipped FileDescriptorProto
+       // 934 bytes of a gzipped FileDescriptorProto
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0xc3, 0x78, 0x5a, 0x79,
+       0xcb, 0xee, 0xb7, 0xd6, 0x1d, 0x96, 0xbc, 0x44, 0xe9, 0xc3, 0xac, 0x67, 
0xdd, 0x17, 0x4a, 0x50,
+       0x3f, 0x4b, 0xeb, 0x0e, 0x7f, 0xad, 0x13, 0xe9, 0x8f, 0x34, 0x32, 0xb6, 
0xc8, 0x69, 0x9d, 0xc8,
+       0xe0, 0xaf, 0x1e, 0x3c, 0x11, 0x28, 0xab, 0x42, 0xe0, 0xce, 0xa8, 0x3e, 
0x37, 0x5f, 0xcb, 0x30,
+       0x2a, 0x32, 0x55, 0xb2, 0x79, 0x8e, 0x5d, 0x6a, 0x6a, 0x5b, 0x36, 0x22, 
0x39, 0x82, 0xc7, 0xbb,
+       0xed, 0x89, 0x8a, 0x3b, 0x3d, 0x32, 0x97, 0x3e, 0xea, 0xf6, 0x66, 0x59, 
0xdc, 0xa9, 0xb9, 0x25,
+       0x85, 0xb8, 0x69, 0x87, 0xdf, 0xcc, 0xad, 0xd1, 0xec, 0x68, 0xed, 0x65, 
0x3a, 0x63, 0x1b, 0x35,
+       0x9a, 0x46, 0xda, 0x8b, 0x35, 0xa2, 0x1a, 0x5b, 0xaf, 0xbd, 0x18, 0x6d, 
0xc4, 0xe0, 0x3d, 0x8c,
+       0xba, 0xe5, 0x9c, 0x80, 0x1b, 0x9b, 0x55, 0xed, 0xcd, 0x47, 0x8b, 0x67, 
0x9d, 0x7f, 0xea, 0x9f,
+       0x4b, 0x4a, 0x35, 0x48, 0xbe, 0x81, 0xfd, 0x26, 0x81, 0xfe, 0x1d, 0x46, 
0x8b, 0x4f, 0x3a, 0xdf,
+       0x7c, 0xa0, 0x61, 0xd4, 0xe2, 0x47, 0xdf, 0x76, 0x5e, 0x1f, 0xf3, 0xaa, 
0x10, 0x0f, 0x06, 0x74,
+       0xfd, 0xf3, 0xf9, 0x72, 0xfa, 0x3f, 0x75, 0x3c, 0xbd, 0xa4, 0x67, 0xeb, 
0x69, 0x8f, 0xec, 0x43,
+       0xff, 0x97, 0xb3, 0xf5, 0xd4, 0x51, 0x07, 0x7a, 0xba, 0x9a, 0xf6, 0x8f, 
0x4e, 0x60, 0x68, 0x9f,
+       0x18, 0x72, 0x00, 0xa0, 0xce, 0x61, 0xe7, 0xc3, 0x8b, 0xd7, 0xdf, 0x5d, 
0xbd, 0x9d, 0xf6, 0xc8,
+       0x10, 0xdc, 0xf3, 0x1f, 0xcf, 0xbf, 0x9f, 0x3a, 0x7f, 0x07, 0x00, 0x00, 
0xff, 0xff, 0x45, 0x27,
+       0x31, 0x3a, 0x61, 0x07, 0x00, 0x00,
 }
diff --git a/lxd/migration/migrate.proto b/lxd/migration/migrate.proto
index e887c3504e..6f04db560e 100644
--- a/lxd/migration/migrate.proto
+++ b/lxd/migration/migrate.proto
@@ -42,8 +42,8 @@ message Snapshot {
        repeated Device                 localDevices    = 5;
        required int32                  architecture    = 6;
        required bool                   stateful                = 7;
-       required int64                  creation_date   = 8;
-       required int64                  last_used_date  = 9;
+       optional int64                  creation_date   = 8;
+       optional int64                  last_used_date  = 9;
 }
 
 message MigrationHeader {
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