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terraform: add a format byte to the diff file so we can iterate maybe
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@ -3,6 +3,7 @@ package terraform
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import (
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"bytes"
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"encoding/gob"
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"errors"
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"fmt"
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"io"
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"sort"
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@ -10,6 +11,8 @@ import (
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"sync"
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)
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const diffFormatByte byte = 1
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// Diff tracks the differences between resources to apply.
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type Diff struct {
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Resources map[string]*ResourceDiff
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@ -21,6 +24,19 @@ type Diff struct {
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func ReadDiff(src io.Reader) (*Diff, error) {
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var result *Diff
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var formatByte [1]byte
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n, err := src.Read(formatByte[:])
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if err != nil {
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return nil, err
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}
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if n != len(formatByte) {
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return nil, errors.New("failed to read diff version byte")
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}
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if formatByte[0] != diffFormatByte {
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return nil, fmt.Errorf("unknown diff file version: %d", formatByte[0])
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}
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dec := gob.NewDecoder(src)
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if err := dec.Decode(&result); err != nil {
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return nil, err
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@ -31,6 +47,14 @@ func ReadDiff(src io.Reader) (*Diff, error) {
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// WriteDiff writes a diff somewhere in a binary format.
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func WriteDiff(d *Diff, dst io.Writer) error {
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n, err := dst.Write([]byte{diffFormatByte})
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if err != nil {
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return err
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}
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if n != 1 {
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return errors.New("failed to write diff version byte")
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}
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return gob.NewEncoder(dst).Encode(d)
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}
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