backup/restore rake task

1 files changed, 92 insertions, 0 deletions

diff --git a/lib/backup/database.rb b/lib/backup/database.rb
new file mode 100644
index 0000000..3ef5f44
--- /dev/null
+++ b/lib/backup/database.rb
@@ -0,0 +1,92 @@
+require 'yaml'
+
+module Backup
+  class Database
+    attr_reader :config, :db_dir
+
+    def initialize
+      @config = YAML.load_file(File.join(Rails.root,'config','database.yml'))[Rails.env]
+      @db_dir = File.join(GitlabCi.config.backup.path, 'db')
+      FileUtils.mkdir_p(@db_dir) unless Dir.exists?(@db_dir)
+    end
+
+    def dump
+      success = case config["adapter"]
+      when /^mysql/ then
+        $progress.print "Dumping MySQL database #{config['database']} ... "
+        system('mysqldump', *mysql_args, config['database'], out: db_file_name)
+      when "postgresql" then
+        $progress.print "Dumping PostgreSQL database #{config['database']} ... "
+        pg_env
+        system('pg_dump', config['database'], out: db_file_name)
+      end
+      report_success(success)
+      abort 'Backup failed' unless success
+    end
+
+    def restore
+      success = case config["adapter"]
+      when /^mysql/ then
+        $progress.print "Restoring MySQL database #{config['database']} ... "
+        system('mysql', *mysql_args, config['database'], in: db_file_name)
+      when "postgresql" then
+        $progress.print "Restoring PostgreSQL database #{config['database']} ... "
+        # Drop all tables because PostgreSQL DB dumps do not contain DROP TABLE
+        # statements like MySQL.
+        drop_all_tables
+        drop_all_postgres_sequences
+        pg_env
+        system('psql', config['database'], '-f', db_file_name)
+      end
+      report_success(success)
+      abort 'Restore failed' unless success
+    end
+
+    protected
+
+    def db_file_name
+      File.join(db_dir, 'database.sql')
+    end
+
+    def mysql_args
+      args = {
+        'host'      => '--host',
+        'port'      => '--port',
+        'socket'    => '--socket',
+        'username'  => '--user',
+        'encoding'  => '--default-character-set',
+        'password'  => '--password'
+      }
+      args.map { |opt, arg| "#{arg}=#{config[opt]}" if config[opt] }.compact
+    end
+
+    def pg_env
+      ENV['PGUSER']     = config["username"] if config["username"]
+      ENV['PGHOST']     = config["host"] if config["host"]
+      ENV['PGPORT']     = config["port"].to_s if config["port"]
+      ENV['PGPASSWORD'] = config["password"].to_s if config["password"]
+    end
+
+    def report_success(success)
+      if success
+        $progress.puts '[DONE]'.green
+      else
+        $progress.puts '[FAILED]'.red
+      end
+    end
+
+    def drop_all_tables
+      connection = ActiveRecord::Base.connection
+      connection.tables.each do |table|
+        connection.drop_table(table)
+      end
+    end
+
+    def drop_all_postgres_sequences
+      connection = ActiveRecord::Base.connection
+      connection.execute("SELECT c.relname FROM pg_class c WHERE c.relkind = 'S';").each do |sequence|
+        connection.execute("DROP SEQUENCE #{sequence['relname']}")
+      end
+    end
+  end
+end