very bad demo code

pkg/envoy/extract.go

@@ -1,9 +1,6 @@
 package envoy
 
 import (
-	"bytes"
-	"crypto/sha256"
-	"encoding/hex"
 	"fmt"
 	"hash"
 	"io"
@@ -13,8 +10,6 @@ import (
 	"sync"
 
 	"github.com/rs/zerolog/log"
-
-	"github.com/pomerium/pomerium/pkg/envoy/files"
 )
 
 const (
@@ -76,34 +71,6 @@ func Extract() (fullEnvoyPath string, err error) {
 	return setupFullEnvoyPath, setupErr
 }
 
-func extract(dstName string) (err error) {
-	checksum, err := hex.DecodeString(strings.Fields(files.Checksum())[0])
-	if err != nil {
-		return fmt.Errorf("checksum %s: %w", files.Checksum(), err)
-	}
-
-	hr := &hashReader{
-		Hash: sha256.New(),
-		r:    bytes.NewReader(files.Binary()),
-	}
-
-	dst, err := os.OpenFile(dstName, os.O_CREATE|os.O_WRONLY, ownerRX)
-	if err != nil {
-		return err
-	}
-	defer func() { err = dst.Close() }()
-
-	if _, err = io.Copy(dst, io.LimitReader(hr, maxExpandedEnvoySize)); err != nil {
-		return err
-	}
-
-	sum := hr.Sum(nil)
-	if !bytes.Equal(sum, checksum) {
-		return fmt.Errorf("expected %x, got %x checksum", checksum, sum)
-	}
-	return nil
-}
-
 func cleanTempDir(tmpDir string) {
 	d, err := os.Open(tmpDir)
 	if err != nil {