From 766b41d9f4be635ce3101ba9aae96c025ef55005 Mon Sep 17 00:00:00 2001
From: Guo Xiang Tan <tgx_world@hotmail.com>
Date: Fri, 9 Mar 2018 14:28:50 +0800
Subject: [PATCH] Fix version check in restorer.

---
 lib/backup_restore/restorer.rb | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/lib/backup_restore/restorer.rb b/lib/backup_restore/restorer.rb
index 5150c7fa9dc..7b66de1b4d4 100644
--- a/lib/backup_restore/restorer.rb
+++ b/lib/backup_restore/restorer.rb
@@ -39,11 +39,8 @@ module BackupRestore
       validate_metadata
 
       extract_dump
-      dumped_by_version = Gem::Version.new(get_dumped_by_version)
-
-      if dumped_by_version >= Gem::Version.new("10.3") ||
-         dumped_by_version >= Gem::Version.new("9.5.12")
 
+      if !can_restore_into_different_schema?
         enable_readonly_mode
 
         pause_sidekiq
@@ -266,6 +263,23 @@ module BackupRestore
       output.match(/version (\d+(\.\d+)?)/)[1]
     end
 
+    def can_restore_into_different_schema?
+      dumped_by_version = Gem::Version.new(get_dumped_by_version)
+
+      return false if dumped_by_version >= Gem::Version.new("10.3")
+
+      %w{
+        9.6.8
+        9.5.12
+        9.4.17
+        9.3.22
+      }.each do |version|
+        return false if Gem::Dependency.new("", "~> #{version}").match?("", dumped_by_version)
+      end
+
+      true
+    end
+
     def restore_dump_command
       if File.extname(@dump_filename) == '.gz'
         "gzip -d < #{@dump_filename} | #{sed_command} | #{psql_command} 2>&1"