github.com/ggriffiths/terraform@v0.9.0-beta1.0.20170222213024-79c4935604cb/command/state_meta.go (about)

     1  package command
     2  
     3  import (
     4  	"errors"
     5  	"fmt"
     6  	"time"
     7  
     8  	backendlocal "github.com/hashicorp/terraform/backend/local"
     9  	"github.com/hashicorp/terraform/state"
    10  	"github.com/hashicorp/terraform/terraform"
    11  )
    12  
    13  // StateMeta is the meta struct that should be embedded in state subcommands.
    14  type StateMeta struct{}
    15  
    16  // State returns the state for this meta. This is different then Meta.State
    17  // in the way that backups are done. This configures backups to be timestamped
    18  // rather than just the original state path plus a backup path.
    19  func (c *StateMeta) State(m *Meta) (state.State, error) {
    20  	// Load the backend
    21  	b, err := m.Backend(nil)
    22  	if err != nil {
    23  		return nil, err
    24  	}
    25  
    26  	// Get the state
    27  	s, err := b.State()
    28  	if err != nil {
    29  		return nil, err
    30  	}
    31  
    32  	// Get a local backend
    33  	localRaw, err := m.Backend(&BackendOpts{ForceLocal: true})
    34  	if err != nil {
    35  		// This should never fail
    36  		panic(err)
    37  	}
    38  	localB := localRaw.(*backendlocal.Local)
    39  
    40  	// Determine the backup path. stateOutPath is set to the resulting
    41  	// file where state is written (cached in the case of remote state)
    42  	backupPath := fmt.Sprintf(
    43  		"%s.%d%s",
    44  		localB.StateOutPath,
    45  		time.Now().UTC().Unix(),
    46  		DefaultBackupExtension)
    47  
    48  	// Wrap it for backups
    49  	s = &state.BackupState{
    50  		Real: s,
    51  		Path: backupPath,
    52  	}
    53  
    54  	return s, nil
    55  }
    56  
    57  // filterInstance filters a single instance out of filter results.
    58  func (c *StateMeta) filterInstance(rs []*terraform.StateFilterResult) (*terraform.StateFilterResult, error) {
    59  	var result *terraform.StateFilterResult
    60  	for _, r := range rs {
    61  		if _, ok := r.Value.(*terraform.InstanceState); !ok {
    62  			continue
    63  		}
    64  
    65  		if result != nil {
    66  			return nil, errors.New(errStateMultiple)
    67  		}
    68  
    69  		result = r
    70  	}
    71  
    72  	return result, nil
    73  }
    74  
    75  const errStateMultiple = `Multiple instances found for the given pattern!
    76  
    77  This command requires that the pattern match exactly one instance
    78  of a resource. To view the matched instances, use "terraform state list".
    79  Please modify the pattern to match only a single instance.`