package state import ( "os" "path/filepath" "github.com/hashicorp/terraform/terraform" ) // LocalState manages a state storage that is local to the filesystem. type LocalState struct { // Path is the path to read the state from. PathOut is the path to // write the state to. If PathOut is not specified, Path will be used. // If PathOut already exists, it will be overwritten. Path string PathOut string state *terraform.State readState *terraform.State written bool } // SetState will force a specific state in-memory for this local state. func (s *LocalState) SetState(state *terraform.State) { s.state = state s.readState = state } // StateReader impl. func (s *LocalState) State() *terraform.State { return s.state } // WriteState for LocalState always persists the state as well. // // StateWriter impl. func (s *LocalState) WriteState(state *terraform.State) error { s.state = state path := s.PathOut if path == "" { path = s.Path } // If we don't have any state, we actually delete the file if it exists if state == nil { err := os.Remove(path) if err != nil && os.IsNotExist(err) { return nil } return err } // Create all the directories if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil { return err } f, err := os.Create(path) if err != nil { return err } defer f.Close() s.state.IncrementSerialMaybe(s.readState) s.readState = s.state if err := terraform.WriteState(s.state, f); err != nil { return err } s.written = true return nil } // PersistState for LocalState is a no-op since WriteState always persists. // // StatePersister impl. func (s *LocalState) PersistState() error { return nil } // StateRefresher impl. func (s *LocalState) RefreshState() error { // If we've never loaded before, read from Path, otherwise we // read from PathOut. path := s.Path if s.written && s.PathOut != "" { path = s.PathOut } f, err := os.Open(path) if err != nil { // It is okay if the file doesn't exist, we treat that as a nil state if !os.IsNotExist(err) { return err } f = nil } var state *terraform.State if f != nil { defer f.Close() state, err = terraform.ReadState(f) if err != nil { return err } } s.state = state s.readState = state return nil }