mirror of
https://github.com/edgelesssys/constellation.git
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110 lines
3.4 KiB
Go
110 lines
3.4 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 terraform
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import (
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"bytes"
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"embed"
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"errors"
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"fmt"
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"io/fs"
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slashpath "path"
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"path/filepath"
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"strings"
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"github.com/edgelesssys/constellation/v2/internal/constants"
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"github.com/edgelesssys/constellation/v2/internal/file"
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"github.com/spf13/afero"
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)
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// ErrTerraformWorkspaceDifferentFiles is returned when a re-used existing Terraform workspace has different files than the ones to be extracted (e.g. due to a version mix-up or incomplete writes).
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var ErrTerraformWorkspaceDifferentFiles = errors.New("creating cluster: trying to overwrite an existing Terraform file with a different version")
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//go:embed terraform/*
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//go:embed terraform/*/.terraform.lock.hcl
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var terraformFS embed.FS
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// prepareWorkspace loads the embedded Terraform files,
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// and writes them into the workspace.
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func prepareWorkspace(rootDir string, fileHandler file.Handler, workingDir string) error {
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return terraformCopier(fileHandler, rootDir, workingDir)
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}
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// prepareUpgradeWorkspace takes the Terraform state file from the old workspace and the
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// embedded Terraform files and writes them into the new workspace.
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func prepareUpgradeWorkspace(rootDir string, fileHandler file.Handler, oldWorkingDir, newWorkingDir string) error {
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// backup old workspace
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if err := fileHandler.CopyDir(
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oldWorkingDir,
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filepath.Join(constants.UpgradeDir, constants.TerraformUpgradeBackupDir),
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); err != nil {
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return fmt.Errorf("backing up old workspace: %w", err)
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}
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// copy state file
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if err := fileHandler.CopyFile(
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filepath.Join(oldWorkingDir, "terraform.tfstate"),
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filepath.Join(newWorkingDir, "terraform.tfstate"),
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file.OptMkdirAll,
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); err != nil {
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return fmt.Errorf("copying state file: %w", err)
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}
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return terraformCopier(fileHandler, rootDir, newWorkingDir)
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}
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// terraformCopier copies the embedded Terraform files into the workspace.
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func terraformCopier(fileHandler file.Handler, rootDir, workingDir string) error {
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goEmbedRootDir := filepath.ToSlash(rootDir)
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return fs.WalkDir(terraformFS, goEmbedRootDir, func(path string, d fs.DirEntry, err error) error {
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if err != nil {
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return err
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}
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if d.IsDir() {
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return nil
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}
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goEmbedPath := filepath.ToSlash(path)
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content, err := terraformFS.ReadFile(goEmbedPath)
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if err != nil {
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return err
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}
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// normalize
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fileName := strings.Replace(slashpath.Join(workingDir, path), goEmbedRootDir+"/", "", 1)
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if err := fileHandler.Write(fileName, content, file.OptMkdirAll); errors.Is(err, afero.ErrFileExists) {
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// If a file already exists, check if it is identical. If yes, continue and don't write anything to disk.
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// If no, don't overwrite it and instead throw an error. The affected file could be from a different version,
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// provider, corrupted or manually modified in general.
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existingFileContent, err := fileHandler.Read(fileName)
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if err != nil {
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return err
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}
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if !bytes.Equal(content, existingFileContent) {
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return ErrTerraformWorkspaceDifferentFiles
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}
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return nil
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} else if err != nil {
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return err
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}
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return nil
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})
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}
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func cleanUpWorkspace(fileHandler file.Handler, workingDir string) error {
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return ignoreFileNotFoundErr(fileHandler.RemoveAll(workingDir))
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}
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// ignoreFileNotFoundErr ignores the error if it is a file not found error.
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func ignoreFileNotFoundErr(err error) error {
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if errors.Is(err, afero.ErrFileNotFound) {
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return nil
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}
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return err
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}
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