599 lines
21 KiB
Go
599 lines
21 KiB
Go
package command
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import (
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"context"
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"errors"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"path/filepath"
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"sort"
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"strings"
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"github.com/hashicorp/terraform/internal/backend"
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"github.com/hashicorp/terraform/internal/command/arguments"
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"github.com/hashicorp/terraform/internal/command/clistate"
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"github.com/hashicorp/terraform/internal/command/views"
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"github.com/hashicorp/terraform/internal/states"
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"github.com/hashicorp/terraform/internal/states/statemgr"
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"github.com/hashicorp/terraform/internal/terraform"
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)
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type backendMigrateOpts struct {
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SourceType, DestinationType string
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Source, Destination backend.Backend
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// Fields below are set internally when migrate is called
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sourceWorkspace string
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destinationWorkspace string
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force bool // if true, won't ask for confirmation
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}
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// backendMigrateState handles migrating (copying) state from one backend
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// to another. This function handles asking the user for confirmation
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// as well as the copy itself.
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//
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// This function can handle all scenarios of state migration regardless
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// of the existence of state in either backend.
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//
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// After migrating the state, the existing state in the first backend
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// remains untouched.
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//
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// This will attempt to lock both states for the migration.
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func (m *Meta) backendMigrateState(opts *backendMigrateOpts) error {
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log.Printf("[TRACE] backendMigrateState: need to migrate from %q to %q backend config", opts.SourceType, opts.DestinationType)
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// We need to check what the named state status is. If we're converting
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// from multi-state to single-state for example, we need to handle that.
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var sourceSingleState, destinationSingleState bool
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sourceWorkspaces, err := opts.Source.Workspaces()
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if err == backend.ErrWorkspacesNotSupported {
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sourceSingleState = true
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err = nil
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}
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if err != nil {
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return fmt.Errorf(strings.TrimSpace(
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errMigrateLoadStates), opts.SourceType, err)
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}
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destinationWorkspaces, err := opts.Destination.Workspaces()
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if err == backend.ErrWorkspacesNotSupported {
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destinationSingleState = true
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err = nil
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}
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if err != nil {
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return fmt.Errorf(strings.TrimSpace(
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errMigrateLoadStates), opts.DestinationType, err)
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}
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// Set up defaults
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opts.sourceWorkspace = backend.DefaultStateName
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opts.destinationWorkspace = backend.DefaultStateName
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opts.force = m.forceInitCopy
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// Disregard remote Terraform version for the state source backend. If it's a
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// Terraform Cloud remote backend, we don't care about the remote version,
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// as we are migrating away and will not break a remote workspace.
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m.ignoreRemoteVersionConflict(opts.Source)
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// Disregard remote Terraform version if instructed to do so via CLI flag.
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if m.ignoreRemoteVersion {
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m.ignoreRemoteVersionConflict(opts.Destination)
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} else {
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// Check the remote Terraform version for the state destination backend. If
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// it's a Terraform Cloud remote backend, we want to ensure that we don't
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// break the workspace by uploading an incompatible state file.
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for _, workspace := range destinationWorkspaces {
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diags := m.remoteVersionCheck(opts.Destination, workspace)
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if diags.HasErrors() {
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return diags.Err()
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}
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}
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// If there are no specified destination workspaces, perform a remote
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// backend version check with the default workspace.
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if len(destinationWorkspaces) == 0 {
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diags := m.remoteVersionCheck(opts.Destination, backend.DefaultStateName)
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if diags.HasErrors() {
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return diags.Err()
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}
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}
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}
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// Determine migration behavior based on whether the source/destination
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// supports multi-state.
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switch {
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// Single-state to single-state. This is the easiest case: we just
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// copy the default state directly.
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case sourceSingleState && destinationSingleState:
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return m.backendMigrateState_s_s(opts)
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// Single-state to multi-state. This is easy since we just copy
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// the default state and ignore the rest in the destination.
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case sourceSingleState && !destinationSingleState:
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return m.backendMigrateState_s_s(opts)
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// Multi-state to single-state. If the source has more than the default
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// state this is complicated since we have to ask the user what to do.
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case !sourceSingleState && destinationSingleState:
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// If the source only has one state and it is the default,
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// treat it as if it doesn't support multi-state.
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if len(sourceWorkspaces) == 1 && sourceWorkspaces[0] == backend.DefaultStateName {
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return m.backendMigrateState_s_s(opts)
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}
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return m.backendMigrateState_S_s(opts)
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// Multi-state to multi-state. We merge the states together (migrating
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// each from the source to the destination one by one).
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case !sourceSingleState && !destinationSingleState:
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// If the source only has one state and it is the default,
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// treat it as if it doesn't support multi-state.
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if len(sourceWorkspaces) == 1 && sourceWorkspaces[0] == backend.DefaultStateName {
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return m.backendMigrateState_s_s(opts)
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}
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return m.backendMigrateState_S_S(opts)
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}
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return nil
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}
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//-------------------------------------------------------------------
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// State Migration Scenarios
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//
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// The functions below cover handling all the various scenarios that
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// can exist when migrating state. They are named in an immediately not
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// obvious format but is simple:
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//
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// Format: backendMigrateState_s1_s2[_suffix]
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//
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// When s1 or s2 is lower case, it means that it is a single state backend.
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// When either is uppercase, it means that state is a multi-state backend.
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// The suffix is used to disambiguate multiple cases with the same type of
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// states.
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//
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//-------------------------------------------------------------------
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// Multi-state to multi-state.
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func (m *Meta) backendMigrateState_S_S(opts *backendMigrateOpts) error {
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log.Print("[TRACE] backendMigrateState: migrating all named workspaces")
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migrate := opts.force
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if !migrate {
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var err error
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// Ask the user if they want to migrate their existing remote state
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migrate, err = m.confirm(&terraform.InputOpts{
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Id: "backend-migrate-multistate-to-multistate",
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Query: fmt.Sprintf(
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"Do you want to migrate all workspaces to %q?",
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opts.DestinationType),
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Description: fmt.Sprintf(
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strings.TrimSpace(inputBackendMigrateMultiToMulti),
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opts.SourceType, opts.DestinationType),
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})
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if err != nil {
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return fmt.Errorf(
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"Error asking for state migration action: %s", err)
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}
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}
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if !migrate {
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return fmt.Errorf("Migration aborted by user.")
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}
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// Read all the states
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sourceWorkspaces, err := opts.Source.Workspaces()
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if err != nil {
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return fmt.Errorf(strings.TrimSpace(
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errMigrateLoadStates), opts.SourceType, err)
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}
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// Sort the states so they're always copied alphabetically
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sort.Strings(sourceWorkspaces)
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// Go through each and migrate
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for _, name := range sourceWorkspaces {
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// Copy the same names
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opts.sourceWorkspace = name
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opts.destinationWorkspace = name
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// Force it, we confirmed above
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opts.force = true
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// Perform the migration
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if err := m.backendMigrateState_s_s(opts); err != nil {
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return fmt.Errorf(strings.TrimSpace(
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errMigrateMulti), name, opts.SourceType, opts.DestinationType, err)
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}
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}
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return nil
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}
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// Multi-state to single state.
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func (m *Meta) backendMigrateState_S_s(opts *backendMigrateOpts) error {
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log.Printf("[TRACE] backendMigrateState: destination backend type %q does not support named workspaces", opts.DestinationType)
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currentEnv, err := m.Workspace()
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if err != nil {
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return err
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}
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migrate := opts.force
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if !migrate {
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var err error
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// Ask the user if they want to migrate their existing remote state
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migrate, err = m.confirm(&terraform.InputOpts{
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Id: "backend-migrate-multistate-to-single",
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Query: fmt.Sprintf(
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"Destination state %q doesn't support workspaces.\n"+
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"Do you want to copy only your current workspace?",
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opts.DestinationType),
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Description: fmt.Sprintf(
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strings.TrimSpace(inputBackendMigrateMultiToSingle),
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opts.SourceType, opts.DestinationType, currentEnv),
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})
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if err != nil {
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return fmt.Errorf(
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"Error asking for state migration action: %s", err)
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}
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}
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if !migrate {
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return fmt.Errorf("Migration aborted by user.")
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}
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// Copy the default state
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opts.sourceWorkspace = currentEnv
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// now switch back to the default env so we can acccess the new backend
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m.SetWorkspace(backend.DefaultStateName)
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return m.backendMigrateState_s_s(opts)
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}
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// Single state to single state, assumed default state name.
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func (m *Meta) backendMigrateState_s_s(opts *backendMigrateOpts) error {
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log.Printf("[TRACE] backendMigrateState: migrating %q workspace to %q workspace", opts.sourceWorkspace, opts.destinationWorkspace)
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sourceState, err := opts.Source.StateMgr(opts.sourceWorkspace)
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if err != nil {
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return fmt.Errorf(strings.TrimSpace(
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errMigrateSingleLoadDefault), opts.SourceType, err)
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}
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if err := sourceState.RefreshState(); err != nil {
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return fmt.Errorf(strings.TrimSpace(
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errMigrateSingleLoadDefault), opts.SourceType, err)
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}
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// Do not migrate workspaces without state.
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if sourceState.State().Empty() {
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log.Print("[TRACE] backendMigrateState: source workspace has empty state, so nothing to migrate")
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return nil
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}
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destinationState, err := opts.Destination.StateMgr(opts.destinationWorkspace)
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if err == backend.ErrDefaultWorkspaceNotSupported {
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// If the backend doesn't support using the default state, we ask the user
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// for a new name and migrate the default state to the given named state.
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destinationState, err = func() (statemgr.Full, error) {
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log.Print("[TRACE] backendMigrateState: destination doesn't support a default workspace, so we must prompt for a new name")
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name, err := m.UIInput().Input(context.Background(), &terraform.InputOpts{
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Id: "new-state-name",
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Query: fmt.Sprintf(
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"[reset][bold][yellow]The %q backend configuration only allows "+
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"named workspaces![reset]",
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opts.DestinationType),
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Description: strings.TrimSpace(inputBackendNewWorkspaceName),
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})
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if err != nil {
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return nil, fmt.Errorf("Error asking for new state name: %s", err)
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}
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// Update the name of the destination state.
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opts.destinationWorkspace = name
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destinationState, err := opts.Destination.StateMgr(opts.destinationWorkspace)
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if err != nil {
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return nil, err
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}
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// Ignore invalid workspace name as it is irrelevant in this context.
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workspace, _ := m.Workspace()
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// If the currently selected workspace is the default workspace, then set
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// the named workspace as the new selected workspace.
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if workspace == backend.DefaultStateName {
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if err := m.SetWorkspace(opts.destinationWorkspace); err != nil {
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return nil, fmt.Errorf("Failed to set new workspace: %s", err)
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}
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}
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return destinationState, nil
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}()
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}
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if err != nil {
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return fmt.Errorf(strings.TrimSpace(
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errMigrateSingleLoadDefault), opts.DestinationType, err)
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}
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if err := destinationState.RefreshState(); err != nil {
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return fmt.Errorf(strings.TrimSpace(
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errMigrateSingleLoadDefault), opts.DestinationType, err)
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}
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// Check if we need migration at all.
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// This is before taking a lock, because they may also correspond to the same lock.
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source := sourceState.State()
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destination := destinationState.State()
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// no reason to migrate if the state is already there
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if source.Equal(destination) {
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// Equal isn't identical; it doesn't check lineage.
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sm1, _ := sourceState.(statemgr.PersistentMeta)
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sm2, _ := destinationState.(statemgr.PersistentMeta)
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if source != nil && destination != nil {
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if sm1 == nil || sm2 == nil {
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log.Print("[TRACE] backendMigrateState: both source and destination workspaces have no state, so no migration is needed")
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return nil
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}
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if sm1.StateSnapshotMeta().Lineage == sm2.StateSnapshotMeta().Lineage {
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log.Printf("[TRACE] backendMigrateState: both source and destination workspaces have equal state with lineage %q, so no migration is needed", sm1.StateSnapshotMeta().Lineage)
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return nil
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}
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}
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}
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if m.stateLock {
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lockCtx := context.Background()
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view := views.NewStateLocker(arguments.ViewHuman, m.View)
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locker := clistate.NewLocker(m.stateLockTimeout, view)
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lockerSource := locker.WithContext(lockCtx)
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if diags := lockerSource.Lock(sourceState, "migration source state"); diags.HasErrors() {
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return diags.Err()
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}
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defer lockerSource.Unlock()
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lockerDestination := locker.WithContext(lockCtx)
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if diags := lockerDestination.Lock(destinationState, "migration destination state"); diags.HasErrors() {
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return diags.Err()
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}
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defer lockerDestination.Unlock()
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// We now own a lock, so double check that we have the version
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// corresponding to the lock.
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log.Print("[TRACE] backendMigrateState: refreshing source workspace state")
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if err := sourceState.RefreshState(); err != nil {
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return fmt.Errorf(strings.TrimSpace(
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errMigrateSingleLoadDefault), opts.SourceType, err)
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}
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log.Print("[TRACE] backendMigrateState: refreshing destination workspace state")
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if err := destinationState.RefreshState(); err != nil {
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return fmt.Errorf(strings.TrimSpace(
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errMigrateSingleLoadDefault), opts.SourceType, err)
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}
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source = sourceState.State()
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destination = destinationState.State()
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}
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var confirmFunc func(statemgr.Full, statemgr.Full, *backendMigrateOpts) (bool, error)
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switch {
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// No migration necessary
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case source.Empty() && destination.Empty():
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log.Print("[TRACE] backendMigrateState: both source and destination workspaces have empty state, so no migration is required")
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return nil
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// No migration necessary if we're inheriting state.
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case source.Empty() && !destination.Empty():
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log.Print("[TRACE] backendMigrateState: source workspace has empty state, so no migration is required")
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return nil
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// We have existing state moving into no state. Ask the user if
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// they'd like to do this.
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case !source.Empty() && destination.Empty():
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log.Print("[TRACE] backendMigrateState: destination workspace has empty state, so might copy source workspace state")
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confirmFunc = m.backendMigrateEmptyConfirm
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// Both states are non-empty, meaning we need to determine which
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// state should be used and update accordingly.
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case !source.Empty() && !destination.Empty():
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log.Print("[TRACE] backendMigrateState: both source and destination workspaces have states, so might overwrite destination with source")
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confirmFunc = m.backendMigrateNonEmptyConfirm
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}
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if confirmFunc == nil {
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panic("confirmFunc must not be nil")
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}
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if !opts.force {
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// Abort if we can't ask for input.
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if !m.input {
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log.Print("[TRACE] backendMigrateState: can't prompt for input, so aborting migration")
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return errors.New("error asking for state migration action: input disabled")
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}
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// Confirm with the user whether we want to copy state over
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confirm, err := confirmFunc(sourceState, destinationState, opts)
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if err != nil {
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log.Print("[TRACE] backendMigrateState: error reading input, so aborting migration")
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return err
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}
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if !confirm {
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log.Print("[TRACE] backendMigrateState: user cancelled at confirmation prompt, so aborting migration")
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return nil
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}
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}
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// Confirmed! We'll have the statemgr package handle the migration, which
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// includes preserving any lineage/serial information where possible, if
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// both managers support such metadata.
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log.Print("[TRACE] backendMigrateState: migration confirmed, so migrating")
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if err := statemgr.Migrate(destinationState, sourceState); err != nil {
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return fmt.Errorf(strings.TrimSpace(errBackendStateCopy),
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opts.SourceType, opts.DestinationType, err)
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}
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if err := destinationState.PersistState(); err != nil {
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return fmt.Errorf(strings.TrimSpace(errBackendStateCopy),
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opts.SourceType, opts.DestinationType, err)
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}
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// And we're done.
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return nil
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}
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func (m *Meta) backendMigrateEmptyConfirm(source, destination statemgr.Full, opts *backendMigrateOpts) (bool, error) {
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inputOpts := &terraform.InputOpts{
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Id: "backend-migrate-copy-to-empty",
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Query: "Do you want to copy existing state to the new backend?",
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Description: fmt.Sprintf(
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strings.TrimSpace(inputBackendMigrateEmpty),
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opts.SourceType, opts.DestinationType),
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}
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return m.confirm(inputOpts)
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}
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func (m *Meta) backendMigrateNonEmptyConfirm(
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sourceState, destinationState statemgr.Full, opts *backendMigrateOpts) (bool, error) {
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// We need to grab both states so we can write them to a file
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source := sourceState.State()
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destination := destinationState.State()
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// Save both to a temporary
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td, err := ioutil.TempDir("", "terraform")
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if err != nil {
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return false, fmt.Errorf("Error creating temporary directory: %s", err)
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}
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defer os.RemoveAll(td)
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// Helper to write the state
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saveHelper := func(n, path string, s *states.State) error {
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mgr := statemgr.NewFilesystem(path)
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return mgr.WriteState(s)
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}
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// Write the states
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sourcePath := filepath.Join(td, fmt.Sprintf("1-%s.tfstate", opts.SourceType))
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destinationPath := filepath.Join(td, fmt.Sprintf("2-%s.tfstate", opts.DestinationType))
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if err := saveHelper(opts.SourceType, sourcePath, source); err != nil {
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return false, fmt.Errorf("Error saving temporary state: %s", err)
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}
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if err := saveHelper(opts.DestinationType, destinationPath, destination); err != nil {
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return false, fmt.Errorf("Error saving temporary state: %s", err)
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}
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// Ask for confirmation
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inputOpts := &terraform.InputOpts{
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Id: "backend-migrate-to-backend",
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Query: "Do you want to copy existing state to the new backend?",
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Description: fmt.Sprintf(
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strings.TrimSpace(inputBackendMigrateNonEmpty),
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opts.SourceType, opts.DestinationType, sourcePath, destinationPath),
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}
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// Confirm with the user that the copy should occur
|
|
return m.confirm(inputOpts)
|
|
}
|
|
|
|
const errMigrateLoadStates = `
|
|
Error inspecting states in the %q backend:
|
|
%s
|
|
|
|
Prior to changing backends, Terraform inspects the source and destination
|
|
states to determine what kind of migration steps need to be taken, if any.
|
|
Terraform failed to load the states. The data in both the source and the
|
|
destination remain unmodified. Please resolve the above error and try again.
|
|
`
|
|
|
|
const errMigrateSingleLoadDefault = `
|
|
Error loading state:
|
|
%[2]s
|
|
|
|
Terraform failed to load the default state from the %[1]q backend.
|
|
State migration cannot occur unless the state can be loaded. Backend
|
|
modification and state migration has been aborted. The state in both the
|
|
source and the destination remain unmodified. Please resolve the
|
|
above error and try again.
|
|
`
|
|
|
|
const errMigrateMulti = `
|
|
Error migrating the workspace %q from the previous %q backend
|
|
to the newly configured %q backend:
|
|
%s
|
|
|
|
Terraform copies workspaces in alphabetical order. Any workspaces
|
|
alphabetically earlier than this one have been copied. Any workspaces
|
|
later than this haven't been modified in the destination. No workspaces
|
|
in the source state have been modified.
|
|
|
|
Please resolve the error above and run the initialization command again.
|
|
This will attempt to copy (with permission) all workspaces again.
|
|
`
|
|
|
|
const errBackendStateCopy = `
|
|
Error copying state from the previous %q backend to the newly configured
|
|
%q backend:
|
|
%s
|
|
|
|
The state in the previous backend remains intact and unmodified. Please resolve
|
|
the error above and try again.
|
|
`
|
|
|
|
const inputBackendMigrateEmpty = `
|
|
Pre-existing state was found while migrating the previous %q backend to the
|
|
newly configured %q backend. No existing state was found in the newly
|
|
configured %[2]q backend. Do you want to copy this state to the new %[2]q
|
|
backend? Enter "yes" to copy and "no" to start with an empty state.
|
|
`
|
|
|
|
const inputBackendMigrateNonEmpty = `
|
|
Pre-existing state was found while migrating the previous %q backend to the
|
|
newly configured %q backend. An existing non-empty state already exists in
|
|
the new backend. The two states have been saved to temporary files that will be
|
|
removed after responding to this query.
|
|
|
|
Previous (type %[1]q): %[3]s
|
|
New (type %[2]q): %[4]s
|
|
|
|
Do you want to overwrite the state in the new backend with the previous state?
|
|
Enter "yes" to copy and "no" to start with the existing state in the newly
|
|
configured %[2]q backend.
|
|
`
|
|
|
|
const inputBackendMigrateMultiToSingle = `
|
|
The existing %[1]q backend supports workspaces and you currently are
|
|
using more than one. The newly configured %[2]q backend doesn't support
|
|
workspaces. If you continue, Terraform will copy your current workspace %[3]q
|
|
to the default workspace in the new backend. Your existing workspaces in the
|
|
source backend won't be modified. If you want to switch workspaces, back them
|
|
up, or cancel altogether, answer "no" and Terraform will abort.
|
|
`
|
|
|
|
const inputBackendMigrateMultiToMulti = `
|
|
Both the existing %[1]q backend and the newly configured %[2]q backend
|
|
support workspaces. When migrating between backends, Terraform will copy
|
|
all workspaces (with the same names). THIS WILL OVERWRITE any conflicting
|
|
states in the destination.
|
|
|
|
Terraform initialization doesn't currently migrate only select workspaces.
|
|
If you want to migrate a select number of workspaces, you must manually
|
|
pull and push those states.
|
|
|
|
If you answer "yes", Terraform will migrate all states. If you answer
|
|
"no", Terraform will abort.
|
|
`
|
|
|
|
const inputBackendNewWorkspaceName = `
|
|
Please provide a new workspace name (e.g. dev, test) that will be used
|
|
to migrate the existing default workspace.
|
|
`
|
|
|
|
const inputBackendSelectWorkspace = `
|
|
This is expected behavior when the selected workspace did not have an
|
|
existing non-empty state. Please enter a number to select a workspace:
|
|
|
|
%s
|
|
`
|