clair/database/pgsql/migrations/00001_change_migrator.go

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// Copyright 2016 clair authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package migrations
import (
"database/sql"
"github.com/remind101/migrate"
)
func init() {
// This migration removes the data maintained by the previous migration tool
// (liamstask/goose), and if it was present, mark the 00002_initial_schema
// migration as done.
RegisterMigration(migrate.Migration{
ID: 1,
Up: func(tx *sql.Tx) error {
// Verify that goose was in use before, otherwise skip this migration.
var e bool
err := tx.QueryRow("SELECT true FROM pg_class WHERE relname = $1", "goose_db_version").Scan(&e)
if err == sql.ErrNoRows {
return nil
}
if err != nil {
return err
}
// Delete goose's data.
_, err = tx.Exec("DROP TABLE goose_db_version CASCADE")
if err != nil {
return err
}
// Mark the '00002_initial_schema' as done.
_, err = tx.Exec("INSERT INTO schema_migrations (version) VALUES (2)")
return err
},
Down: migrate.Queries([]string{}),
})
}