func runMigrationsUpTo(b backend.Backend, targetVersion int64) (bool, error) {
migrationsRun := 0
currentVersion := b.CurrentSchemaVersion()
for i := int64(1); i <= latestMigrationVersion; i++ {
m := availableMigrations[i]
// skip migrations we've already run
if currentVersion >= m.Version {
continue
}
// run migrations up to and through our target version.
if m.Version > targetVersion {
break
}
if err := m.Run(b); err != nil {
return false, err
}
migrationsRun++
}
if migrationsRun == 0 {
fmt.Println("No migrations needed to be run.")
} else {
fmt.Println("All migrations ran successfully.")
}
return false, nil
}
// Run executes the migration using a supplied backend.Backend
func (m *Migration) Run(b backend.Backend) error {
fmt.Printf("Running migration #%d against %s backend\n", m.Version, b.Name())
if err := m.runner(b); err != nil {
return errored.Errorf("Encountered error during migration %d", m.Version).Combine(err)
}
if err := b.UpdateSchemaVersion(m.Version); err != nil {
return errored.Errorf("Successfully applied migration but failed to update schema version key").Combine(err)
}
fmt.Println("")
return nil
}