Feature #4305: Add onedb sqlite2mysql command

(cherry picked from commit f9c950367b)

src/onedb/onedb

@@ -356,4 +356,24 @@ cmd=CommandParser::CmdParser.new(ARGV) do
         end
     end
 
+    ###########################################################################
+    # Migrate SQLite to MySQL
+    ###########################################################################
+    sqlite2mysql_desc = <<-EOT.unindent
+        Migrates a SQLite OpenNebula Database to MySQL
+    EOT
+
+    command :sqlite2mysql , sqlite2mysql_desc, :options=>[BACKUP, FORCE] do
+        begin
+            options[:backend] = :sqlite
+            sqlite = OneDB.new(options)
+
+            options[:backend] = :mysql
+            mysql = OneDB.new(options)
+
+            mysql.sqlite2mysql(options, sqlite)
+        rescue Exception => e
+            [-1, e.message]
+        end
+    end
 end

src/onedb/onedb.rb

@@ -20,6 +20,8 @@ require 'onedb_backend'
 LOG_TIME = false
 
 class OneDB
+    attr_accessor :backend
+
     def initialize(ops)
         if ops[:backend] == :sqlite
             begin
@@ -519,6 +521,40 @@ is preserved.
         end
     end
 
+    def sqlite2mysql(options, sqlite)
+        one_not_running()
+
+        sqlite_v = sqlite.backend.read_db_version
+        mysql_v  = @backend.read_db_version
+
+        if !options[:force]
+            match = true
+            match = false if sqlite_v[:version] != mysql_v[:version]
+            match = false if sqlite_v[:local_version] != mysql_v[:local_version]
+
+            if !match
+                err_msg =  "SQLite version: #{sqlite_v[:version]}\n"
+                err_msg << "SQLite local version: #{sqlite_v[:local_version]}\n"
+                err_msg << "MySQL version: #{mysql_v[:version]}\n"
+                err_msg << "MySQL local version: #{mysql_v[:local_version]}\n"
+                err_msg << "The MySQL and SQLite versions do not match. Please run "
+                err_msg << "'onedb -i' in order to bootstrap a blank OpenNebula DB."
+
+                raise err_msg
+            end
+        end
+
+        backup(options[:backup], options)
+
+        file = "#{RUBY_LIB_LOCATION}/onedb/sqlite2mysql.rb"
+        load(file)
+        @backend.extend Sqlite2MySQL
+
+        @backend.convert(sqlite.backend.db)
+
+        return 0
+    end
+
     private
 
     def one_not_running()

src/onedb/onedb_backend.rb

@@ -286,7 +286,11 @@ class BackEndSQLite < OneDBBacKEnd
     require 'fileutils'
 
     def initialize(file)
-        @sqlite_file = file
+        if !file.nil?
+            @sqlite_file = file
+        else
+            raise "SQLite database path not supplied."
+        end
     end
 
     def bck_file

src/onedb/sqlite2mysql.rb

@@ -0,0 +1,33 @@
+module Sqlite2MySQL
+
+    PROGRESS = 1000
+
+    def convert(sqlite_db)
+        puts "Starting migration from SQLite to MySQL\n"
+
+        sqlite_db.tables.each do |table|
+            @db[table].delete
+
+            records = sqlite_db[table].count
+            puts "> #{table} (#{records} records)"
+
+            i=0
+            sqlite_db[table].each do |row|
+                @db[table].insert(row)
+
+                i+=1
+                if i % PROGRESS == 0
+                    if i < PROGRESS+1
+                        print "  #{i}"
+                    else
+                        print "...#{i}"
+                    end
+                end
+            end
+
+            puts if i > PROGRESS-1
+        end
+
+        puts "\nMigration successful."
+    end
+end