mirror of
https://github.com/edgelesssys/constellation.git
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4c8ce55e5a
* Allow creation of Constellation clusters using `apply` command * Add auto-completion for `--skip-phases` flag * Deprecate create command * Replace all doc references to create command with apply --------- Signed-off-by: Daniel Weiße <dw@edgeless.systems>
98 lines
3.0 KiB
Go
98 lines
3.0 KiB
Go
/*
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Copyright (c) Edgeless Systems GmbH
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SPDX-License-Identifier: AGPL-3.0-only
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*/
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package cloudcmd
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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"
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"os"
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"github.com/edgelesssys/constellation/v2/cli/internal/terraform"
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"github.com/edgelesssys/constellation/v2/internal/file"
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)
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// plan prepares a workspace and plans the possible Terraform actions.
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// This will either create a new workspace or update an existing one.
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// In case of possible migrations, the diff is written to outWriter and this function returns true.
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func plan(
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ctx context.Context, tfClient tfPlanner, fileHandler file.Handler,
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outWriter io.Writer, logLevel terraform.LogLevel, vars terraform.Variables,
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templateDir, existingWorkspace, backupDir string,
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) (bool, error) {
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isNewWorkspace, err := fileHandler.IsEmpty(existingWorkspace)
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if err != nil {
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if !errors.Is(err, os.ErrNotExist) {
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return false, fmt.Errorf("checking if workspace is empty: %w", err)
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}
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isNewWorkspace = true
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}
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// Backup old workspace if it exists
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if !isNewWorkspace {
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if err := ensureFileNotExist(fileHandler, backupDir); err != nil {
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return false, fmt.Errorf("backup directory %s already exists: %w", backupDir, err)
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}
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if err := fileHandler.CopyDir(existingWorkspace, backupDir); err != nil {
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return false, fmt.Errorf("backing up old workspace: %w", err)
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}
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}
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// Move the new embedded Terraform files into the workspace.
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if err := tfClient.PrepareWorkspace(templateDir, vars); err != nil {
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return false, fmt.Errorf("preparing terraform workspace: %w", err)
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}
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hasDiff, err := tfClient.Plan(ctx, logLevel)
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if err != nil {
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return false, fmt.Errorf("terraform plan: %w", err)
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}
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// If we are planning in a new workspace, we don't want to show the plan
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if isNewWorkspace {
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return hasDiff, nil
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}
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if hasDiff {
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if err := tfClient.ShowPlan(ctx, logLevel, outWriter); err != nil {
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return false, fmt.Errorf("terraform show plan: %w", err)
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}
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}
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return hasDiff, nil
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}
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// restoreBackup replaces the existing Terraform workspace with the backup.
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// If no backup exists, this function simply removes workingDir.
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func restoreBackup(fileHandler file.Handler, workingDir, backupDir string) error {
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if err := fileHandler.RemoveAll(workingDir); err != nil {
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return fmt.Errorf("removing existing workspace: %w", err)
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}
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if err := fileHandler.CopyDir(
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backupDir,
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workingDir,
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); err != nil && !errors.Is(err, os.ErrNotExist) { // ignore not found error because backup does not exist for new clusters
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return fmt.Errorf("replacing terraform workspace with backup: %w", err)
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}
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if err := fileHandler.RemoveAll(backupDir); err != nil {
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return fmt.Errorf("removing backup directory: %w", err)
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}
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return nil
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}
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// ensureFileNotExist checks if a single file or directory does not exist, returning an error if it does.
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func ensureFileNotExist(fileHandler file.Handler, fileName string) error {
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if _, err := fileHandler.Stat(fileName); err != nil {
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if !os.IsNotExist(err) {
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return fmt.Errorf("checking %q: %w", fileName, err)
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}
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return nil
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}
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return fmt.Errorf("%q already exists", fileName)
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}
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