mirror of
https://github.com/opentofu/opentofu.git
synced 2024-12-25 08:21:07 -06:00
418a8a8bc9
We're shifting terminology from "environment" to "workspace". This takes care of some of the main internal API surface that was using the old terminology, though is not intended to be entirely comprehensive and is mainly just to minimize the amount of confusion for maintainers as we continue moving towards eliminating the old terminology.
521 lines
15 KiB
Go
521 lines
15 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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"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/backend"
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"github.com/hashicorp/terraform/command/clistate"
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"github.com/hashicorp/terraform/state"
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"github.com/hashicorp/terraform/terraform"
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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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// 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 oneSingle, twoSingle bool
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oneStates, err := opts.One.States()
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if err == backend.ErrNamedStatesNotSupported {
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oneSingle = 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.OneType, err)
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}
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_, err = opts.Two.States()
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if err == backend.ErrNamedStatesNotSupported {
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twoSingle = 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.TwoType, err)
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}
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// Setup defaults
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opts.oneEnv = backend.DefaultStateName
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opts.twoEnv = backend.DefaultStateName
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opts.force = m.forceInitCopy
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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 oneSingle && twoSingle:
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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 oneSingle && !twoSingle:
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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 !oneSingle && twoSingle:
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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(oneStates) == 1 && oneStates[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 !oneSingle && !twoSingle:
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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(oneStates) == 1 && oneStates[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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// 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.TwoType),
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Description: fmt.Sprintf(
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strings.TrimSpace(inputBackendMigrateMultiToMulti),
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opts.OneType, opts.TwoType),
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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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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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oneStates, err := opts.One.States()
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if err != nil {
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return fmt.Errorf(strings.TrimSpace(
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errMigrateLoadStates), opts.OneType, err)
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}
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// Sort the states so they're always copied alphabetically
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sort.Strings(oneStates)
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// Go through each and migrate
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for _, name := range oneStates {
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// Copy the same names
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opts.oneEnv = name
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opts.twoEnv = 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.OneType, opts.TwoType, 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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currentEnv := m.Workspace()
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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.TwoType),
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Description: fmt.Sprintf(
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strings.TrimSpace(inputBackendMigrateMultiToSingle),
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opts.OneType, opts.TwoType, 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.oneEnv = 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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stateOne, err := opts.One.State(opts.oneEnv)
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if err != nil {
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return fmt.Errorf(strings.TrimSpace(
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errMigrateSingleLoadDefault), opts.OneType, err)
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}
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if err := stateOne.RefreshState(); err != nil {
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return fmt.Errorf(strings.TrimSpace(
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errMigrateSingleLoadDefault), opts.OneType, err)
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}
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stateTwo, err := opts.Two.State(opts.twoEnv)
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if err != nil {
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return fmt.Errorf(strings.TrimSpace(
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errMigrateSingleLoadDefault), opts.TwoType, err)
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}
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if err := stateTwo.RefreshState(); err != nil {
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return fmt.Errorf(strings.TrimSpace(
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errMigrateSingleLoadDefault), opts.TwoType, 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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one := stateOne.State()
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two := stateTwo.State()
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// no reason to migrate if the state is already there
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if one.Equal(two) {
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// Equal isn't identical; it doesn't check lineage.
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if one != nil && two != nil && one.Lineage == two.Lineage {
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return nil
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}
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}
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if m.stateLock {
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lockCtx, cancel := context.WithTimeout(context.Background(), m.stateLockTimeout)
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defer cancel()
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lockInfoOne := state.NewLockInfo()
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lockInfoOne.Operation = "migration"
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lockInfoOne.Info = "source state"
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lockIDOne, err := clistate.Lock(lockCtx, stateOne, lockInfoOne, m.Ui, m.Colorize())
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if err != nil {
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return fmt.Errorf("Error locking source state: %s", err)
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}
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defer clistate.Unlock(stateOne, lockIDOne, m.Ui, m.Colorize())
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lockInfoTwo := state.NewLockInfo()
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lockInfoTwo.Operation = "migration"
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lockInfoTwo.Info = "destination state"
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lockIDTwo, err := clistate.Lock(lockCtx, stateTwo, lockInfoTwo, m.Ui, m.Colorize())
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if err != nil {
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return fmt.Errorf("Error locking destination state: %s", err)
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}
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defer clistate.Unlock(stateTwo, lockIDTwo, m.Ui, m.Colorize())
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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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if err := stateOne.RefreshState(); err != nil {
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return fmt.Errorf(strings.TrimSpace(
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errMigrateSingleLoadDefault), opts.OneType, err)
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}
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if err := stateTwo.RefreshState(); err != nil {
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return fmt.Errorf(strings.TrimSpace(
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errMigrateSingleLoadDefault), opts.OneType, err)
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}
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one = stateOne.State()
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two = stateTwo.State()
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}
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// Clear the legacy remote state in both cases. If we're at the migration
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// step then this won't be used anymore.
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if one != nil {
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one.Remote = nil
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}
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if two != nil {
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two.Remote = nil
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}
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var confirmFunc func(state.State, state.State, *backendMigrateOpts) (bool, error)
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switch {
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// No migration necessary
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case one.Empty() && two.Empty():
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return nil
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// No migration necessary if we're inheriting state.
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case one.Empty() && !two.Empty():
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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 !one.Empty() && two.Empty():
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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 !one.Empty() && !two.Empty():
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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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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(stateOne, stateTwo, opts)
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if err != nil {
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return err
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}
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if !confirm {
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return nil
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}
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}
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// Confirmed! Write.
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if err := stateTwo.WriteState(one); err != nil {
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return fmt.Errorf(strings.TrimSpace(errBackendStateCopy),
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opts.OneType, opts.TwoType, err)
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}
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if err := stateTwo.PersistState(); err != nil {
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return fmt.Errorf(strings.TrimSpace(errBackendStateCopy),
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opts.OneType, opts.TwoType, 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(one, two state.State, 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: fmt.Sprintf(
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"Do you want to copy state from %q to %q?",
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opts.OneType, opts.TwoType),
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Description: fmt.Sprintf(
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strings.TrimSpace(inputBackendMigrateEmpty),
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opts.OneType, opts.TwoType),
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}
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// Confirm with the user that the copy should occur
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for {
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v, err := m.UIInput().Input(inputOpts)
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if err != nil {
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return false, fmt.Errorf(
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"Error asking for state copy action: %s", err)
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}
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switch strings.ToLower(v) {
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case "no":
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return false, nil
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case "yes":
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return true, nil
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}
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}
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}
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func (m *Meta) backendMigrateNonEmptyConfirm(
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stateOne, stateTwo state.State, 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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one := stateOne.State()
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two := stateTwo.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 *terraform.State) error {
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f, err := os.Create(path)
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if err != nil {
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return err
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}
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defer f.Close()
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return terraform.WriteState(s, f)
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}
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// Write the states
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onePath := filepath.Join(td, fmt.Sprintf("1-%s.tfstate", opts.OneType))
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twoPath := filepath.Join(td, fmt.Sprintf("2-%s.tfstate", opts.TwoType))
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if err := saveHelper(opts.OneType, onePath, one); 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.TwoType, twoPath, two); 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: fmt.Sprintf(
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"Do you want to copy state from %q to %q?",
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opts.OneType, opts.TwoType),
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Description: fmt.Sprintf(
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strings.TrimSpace(inputBackendMigrateNonEmpty),
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opts.OneType, opts.TwoType, onePath, twoPath),
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}
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// Confirm with the user that the copy should occur
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for {
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v, err := m.UIInput().Input(inputOpts)
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if err != nil {
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return false, fmt.Errorf(
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"Error asking for state copy action: %s", err)
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}
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switch strings.ToLower(v) {
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case "no":
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return false, nil
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case "yes":
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return true, nil
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}
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}
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}
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type backendMigrateOpts struct {
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OneType, TwoType string
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One, Two backend.Backend
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// Fields below are set internally when migrate is called
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oneEnv string // source env
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twoEnv string // dest env
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force bool // if true, won't ask for confirmation
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}
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const errMigrateLoadStates = `
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Error inspecting state in %q: %s
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Prior to changing backends, Terraform inspects the source and destination
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states to determine what kind of migration steps need to be taken, if any.
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Terraform failed to load the states. The data in both the source and the
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destination remain unmodified. Please resolve the above error and try again.
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`
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const errMigrateSingleLoadDefault = `
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Error loading state from %q: %s
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Terraform failed to load the default state from %[1]q.
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State migration cannot occur unless the state can be loaded. Backend
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modification and state migration has been aborted. The state in both the
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source and the destination remain unmodified. Please resolve the
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above error and try again.
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`
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const errMigrateMulti = `
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Error migrating the workspace %q from %q to %q:
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%s
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Terraform copies workspaces in alphabetical order. Any workspaces
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alphabetically earlier than this one have been copied. Any workspaces
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later than this haven't been modified in the destination. No workspaces
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in the source state have been modified.
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Please resolve the error above and run the initialization command again.
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This will attempt to copy (with permission) all workspaces again.
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`
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const errBackendStateCopy = `
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Error copying state from %q to %q: %s
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The state in %[1]q remains intact and unmodified. Please resolve the
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error above and try again.
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`
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const inputBackendMigrateEmpty = `
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Pre-existing state was found in %q while migrating to %q. No existing
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state was found in %[2]q. Do you want to copy the state from %[1]q to
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%[2]q? Enter "yes" to copy and "no" to start with an empty state.
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`
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const inputBackendMigrateNonEmpty = `
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Pre-existing state was found in %q while migrating to %q. An existing
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non-empty state exists in %[2]q. The two states have been saved to temporary
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files that will be removed after responding to this query.
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One (%[1]q): %[3]s
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Two (%[2]q): %[4]s
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Do you want to copy the state from %[1]q to %[2]q? Enter "yes" to copy
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and "no" to start with the existing state in %[2]q.
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`
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const inputBackendMigrateMultiToSingle = `
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The existing backend %[1]q supports workspaces and you currently are
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using more than one. The target backend %[2]q doesn't support workspaces.
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If you continue, Terraform will offer to copy your current workspace
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%[3]q to the default workspace in the target. Your existing workspaces
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in the source backend won't be modified. If you want to switch workspaces,
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back them up, or cancel altogether, answer "no" and Terraform will abort.
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`
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const inputBackendMigrateMultiToMulti = `
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Both the existing backend %[1]q and the target backend %[2]q support
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workspaces. When migrating between backends, Terraform will copy all
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workspaces (with the same names). THIS WILL OVERWRITE any conflicting
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states in the destination.
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Terraform initialization doesn't currently migrate only select workspaces.
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If you want to migrate a select number of workspaces, you must manually
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pull and push those states.
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If you answer "yes", Terraform will migrate all states. If you answer
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"no", Terraform will abort.
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`
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