Avoid marshaling/unmarshaling to yaml

Instead, use the `gob` package to encode/decode the bytes. This is to
avoid errors that might arise from the marshaling/unmarshaling to YAML.

Signed-off-by: Peter Engelbert <pmengelbert@gmail.com>

Author: pmengelbert

cmd/frontend/git_credential_gomod.go

@@ -4,6 +4,7 @@ import (
 	"bufio"
 	"bytes"
 	"encoding/base64"
+	"encoding/gob"
 	"errors"
 	"fmt"
 	"io"
@@ -12,7 +13,6 @@ import (
 	"strings"
 
 	"github.com/Azure/dalec"
-	"github.com/goccy/go-yaml"
 )
 
 const (
@@ -210,7 +210,10 @@ func getHostAuthFromConfigFile(configFile, hostname string) (*dalec.GomodGitAuth
 		return nil, err
 	}
 
-	if err := yaml.Unmarshal(b, &m); err != nil {
+	buf := bytes.NewBuffer(b)
+	dec := gob.NewDecoder(buf)
+
+	if err := dec.Decode(&m); err != nil {
 		return nil, err
 	}
 

generator_gomod.go

@@ -2,11 +2,11 @@ package dalec
 
 import (
 	"bytes"
+	"encoding/gob"
 	"fmt"
 	"path/filepath"
 	"sort"
 
-	"github.com/goccy/go-yaml"
 	"github.com/moby/buildkit/client/llb"
 	"github.com/pkg/errors"
 )
@@ -89,12 +89,13 @@ func (g *SourceGenerator) mountGitAuthConfig(mountPoint, basename string) llb.Ru
 			return
 		}
 
-		b, err := yaml.Marshal(&g.Gomod.Auth)
-		if err != nil {
-			panic("cannot marshal dalec spec yaml")
+		var b bytes.Buffer
+		enc := gob.NewEncoder(&b)
+		if err := enc.Encode(g.Gomod.Auth); err != nil {
+			panic("cannot marshal dalec spec bytes")
 		}
 
-		st := llb.Scratch().File(llb.Mkfile("/"+basename, 0o644, b))
+		st := llb.Scratch().File(llb.Mkfile("/"+basename, 0o644, b.Bytes()))
 		llb.AddMount(mountPoint, st).SetRunOption(ei)
 	})
 }

source_test.go

@@ -228,9 +228,6 @@ func TestSourceGitHTTP(t *testing.T) {
 }
 
 func getGomodLLBOps(ctx context.Context, t *testing.T, spec Spec) (map[string]*pb.Op, []*pb.Op) {
-	type currentFrontend interface {
-		CurrentFrontend() (*llb.State, error)
-	}
 	sOpt := SourceOpts{
 		GetContext: func(name string, opts ...llb.LocalOption) (*llb.State, error) {
 			st := llb.Local(name, opts...)