mirror of https://github.com/databricks/cli.git
100 lines
2.1 KiB
Go
100 lines
2.1 KiB
Go
package terraform
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import (
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"bytes"
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"context"
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"errors"
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"io"
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"io/fs"
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"os"
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"path/filepath"
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"github.com/databricks/cli/bundle"
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"github.com/databricks/cli/bundle/deploy"
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"github.com/databricks/cli/libs/filer"
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"github.com/databricks/cli/libs/log"
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)
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type statePull struct {
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filerFactory deploy.FilerFactory
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}
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func (l *statePull) Name() string {
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return "terraform:state-pull"
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}
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func (l *statePull) remoteState(ctx context.Context, f filer.Filer) (*bytes.Buffer, error) {
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// Download state file from filer to local cache directory.
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remote, err := f.Read(ctx, TerraformStateFileName)
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if err != nil {
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// On first deploy this state file doesn't yet exist.
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if errors.Is(err, fs.ErrNotExist) {
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return nil, nil
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}
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return nil, err
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}
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defer remote.Close()
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var buf bytes.Buffer
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_, err = io.Copy(&buf, remote)
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if err != nil {
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return nil, err
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}
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return &buf, nil
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}
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func (l *statePull) Apply(ctx context.Context, b *bundle.Bundle) error {
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f, err := l.filerFactory(b)
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if err != nil {
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return err
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}
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dir, err := Dir(ctx, b)
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if err != nil {
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return err
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}
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// Download state file from filer to local cache directory.
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log.Infof(ctx, "Opening remote state file")
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remote, err := l.remoteState(ctx, f)
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if err != nil {
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log.Infof(ctx, "Unable to open remote state file: %s", err)
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return err
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}
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if remote == nil {
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log.Infof(ctx, "Remote state file does not exist")
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return nil
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}
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// Expect the state file to live under dir.
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local, err := os.OpenFile(filepath.Join(dir, TerraformStateFileName), os.O_CREATE|os.O_RDWR, 0600)
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if err != nil {
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return err
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}
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defer local.Close()
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if !IsLocalStateStale(local, bytes.NewReader(remote.Bytes())) {
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log.Infof(ctx, "Local state is the same or newer, ignoring remote state")
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return nil
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}
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// Truncating the file before writing
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local.Truncate(0)
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local.Seek(0, 0)
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// Write file to disk.
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log.Infof(ctx, "Writing remote state file to local cache directory")
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_, err = io.Copy(local, bytes.NewReader(remote.Bytes()))
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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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func StatePull() bundle.Mutator {
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return &statePull{deploy.StateFiler}
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}
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