buildflags: fix ref only format for command line and bake

Signed-off-by: Jonathan A. Sternberg <jonathan.sternberg@docker.com>
(cherry picked from commit 11c84973ef104e48eb88a41b5b23d6a559efe868)

bake/bake.go

@@ -29,7 +29,6 @@ import (
 	"github.com/moby/buildkit/session/auth/authprovider"
 	"github.com/moby/buildkit/util/entitlements"
 	"github.com/pkg/errors"
-	"github.com/tonistiigi/go-csvvalue"
 	"github.com/zclconf/go-cty/cty"
 	"github.com/zclconf/go-cty/cty/convert"
 )
@@ -900,7 +899,7 @@ func (t *Target) AddOverrides(overrides map[string]Override, ent *EntitlementCon
 		case "tags":
 			t.Tags = o.ArrValue
 		case "cache-from":
-			cacheFrom, err := parseCacheArrValues(o.ArrValue)
+			cacheFrom, err := buildflags.ParseCacheEntry(o.ArrValue)
 			if err != nil {
 				return err
 			}
@@ -913,7 +912,7 @@ func (t *Target) AddOverrides(overrides map[string]Override, ent *EntitlementCon
 				}
 			}
 		case "cache-to":
-			cacheTo, err := parseCacheArrValues(o.ArrValue)
+			cacheTo, err := buildflags.ParseCacheEntry(o.ArrValue)
 			if err != nil {
 				return err
 			}
@@ -1585,37 +1584,3 @@ func parseArrValue[T any, PT arrValue[T]](s []string) ([]*T, error) {
 	}
 	return outputs, nil
 }
-
-func parseCacheArrValues(s []string) (buildflags.CacheOptions, error) {
-	var outs buildflags.CacheOptions
-	for _, in := range s {
-		if in == "" {
-			continue
-		}
-
-		if !strings.Contains(in, "=") {
-			// This is ref only format. Each field in the CSV is its own entry.
-			fields, err := csvvalue.Fields(in, nil)
-			if err != nil {
-				return nil, err
-			}
-
-			for _, field := range fields {
-				out := buildflags.CacheOptionsEntry{}
-				if err := out.UnmarshalText([]byte(field)); err != nil {
-					return nil, err
-				}
-				outs = append(outs, &out)
-			}
-			continue
-		}
-
-		// Normal entry.
-		out := buildflags.CacheOptionsEntry{}
-		if err := out.UnmarshalText([]byte(in)); err != nil {
-			return nil, err
-		}
-		outs = append(outs, &out)
-	}
-	return outs, nil
-}

bake/bake_test.go

@@ -9,6 +9,7 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/docker/buildx/util/buildflags"
 	"github.com/moby/buildkit/util/entitlements"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -1759,6 +1760,27 @@ func TestAnnotations(t *testing.T) {
 	require.Equal(t, "bar", bo["app"].Exports[0].Attrs["annotation-manifest[linux/amd64].foo"])
 }
 
+func TestRefOnlyCacheOptions(t *testing.T) {
+	fp := File{
+		Name: "docker-bake.hcl",
+		Data: []byte(
+			`target "app" {
+				output = ["type=image,name=foo"]
+        cache-from = ["ref1,ref2"]
+			}`),
+	}
+	ctx := context.TODO()
+	m, _, err := ReadTargets(ctx, []File{fp}, []string{"app"}, nil, nil, &EntitlementConf{})
+	require.NoError(t, err)
+
+	require.Len(t, m, 1)
+	require.Contains(t, m, "app")
+	require.Equal(t, buildflags.CacheOptions{
+		{Type: "registry", Attrs: map[string]string{"ref": "ref1"}},
+		{Type: "registry", Attrs: map[string]string{"ref": "ref2"}},
+	}, m["app"].CacheFrom)
+}
+
 func TestHCLEntitlements(t *testing.T) {
 	fp := File{
 		Name: "docker-bake.hcl",

bake/compose.go

@@ -145,12 +145,12 @@ func ParseCompose(cfgs []composetypes.ConfigFile, envs map[string]string) (*Conf
 				labels[k] = &v
 			}
 
-			cacheFrom, err := parseCacheArrValues(s.Build.CacheFrom)
+			cacheFrom, err := buildflags.ParseCacheEntry(s.Build.CacheFrom)
 			if err != nil {
 				return nil, err
 			}
 
-			cacheTo, err := parseCacheArrValues(s.Build.CacheTo)
+			cacheTo, err := buildflags.ParseCacheEntry(s.Build.CacheTo)
 			if err != nil {
 				return nil, err
 			}
@@ -349,14 +349,14 @@ func (t *Target) composeExtTarget(exts map[string]interface{}) error {
 		t.Tags = dedupSlice(append(t.Tags, xb.Tags...))
 	}
 	if len(xb.CacheFrom) > 0 {
-		cacheFrom, err := parseCacheArrValues(xb.CacheFrom)
+		cacheFrom, err := buildflags.ParseCacheEntry(xb.CacheFrom)
 		if err != nil {
 			return err
 		}
 		t.CacheFrom = t.CacheFrom.Merge(cacheFrom)
 	}
 	if len(xb.CacheTo) > 0 {
-		cacheTo, err := parseCacheArrValues(xb.CacheTo)
+		cacheTo, err := buildflags.ParseCacheEntry(xb.CacheTo)
 		if err != nil {
 			return err
 		}

commands/build.go

@@ -183,14 +183,17 @@ func (o *buildOptions) toControllerOptions() (*controllerapi.BuildOptions, error
 		}
 	}
 
-	opts.CacheFrom, err = buildflags.ParseCacheEntry(o.cacheFrom)
+	cacheFrom, err := buildflags.ParseCacheEntry(o.cacheFrom)
 	if err != nil {
 		return nil, err
 	}
-	opts.CacheTo, err = buildflags.ParseCacheEntry(o.cacheTo)
+	opts.CacheFrom = cacheFrom.ToPB()
+
+	cacheTo, err := buildflags.ParseCacheEntry(o.cacheTo)
 	if err != nil {
 		return nil, err
 	}
+	opts.CacheTo = cacheTo.ToPB()
 
 	opts.Secrets, err = buildflags.ParseSecretSpecs(o.secrets)
 	if err != nil {

util/buildflags/cache.go

@@ -167,20 +167,37 @@ func (e *CacheOptionsEntry) validate(gv interface{}) error {
 	return nil
 }
 
-func ParseCacheEntry(in []string) ([]*controllerapi.CacheOptionsEntry, error) {
+func ParseCacheEntry(in []string) (CacheOptions, error) {
 	if len(in) == 0 {
 		return nil, nil
 	}
 
 	opts := make(CacheOptions, 0, len(in))
 	for _, in := range in {
+		if !strings.Contains(in, "=") {
+			// This is ref only format. Each field in the CSV is its own entry.
+			fields, err := csvvalue.Fields(in, nil)
+			if err != nil {
+				return nil, err
+			}
+
+			for _, field := range fields {
+				opt := CacheOptionsEntry{}
+				if err := opt.UnmarshalText([]byte(field)); err != nil {
+					return nil, err
+				}
+				opts = append(opts, &opt)
+			}
+			continue
+		}
+
 		var out CacheOptionsEntry
 		if err := out.UnmarshalText([]byte(in)); err != nil {
 			return nil, err
 		}
 		opts = append(opts, &out)
 	}
-	return opts.ToPB(), nil
+	return opts, nil
 }
 
 func addGithubToken(ci *controllerapi.CacheOptionsEntry) {

util/buildflags/cache_cty.go

@@ -30,6 +30,16 @@ func (o *CacheOptions) fromCtyValue(in cty.Value, p cty.Path) error {
 			continue
 		}
 
+		// Special handling for a string type to handle ref only format.
+		if value.Type() == cty.String {
+			entries, err := ParseCacheEntry([]string{value.AsString()})
+			if err != nil {
+				return err
+			}
+			*o = append(*o, entries...)
+			continue
+		}
+
 		entry := &CacheOptionsEntry{}
 		if err := entry.FromCtyValue(value, p); err != nil {
 			return err
@@ -52,13 +62,6 @@ func (o CacheOptions) ToCtyValue() cty.Value {
 }
 
 func (o *CacheOptionsEntry) FromCtyValue(in cty.Value, p cty.Path) error {
-	if in.Type() == cty.String {
-		if err := o.UnmarshalText([]byte(in.AsString())); err != nil {
-			return p.NewError(err)
-		}
-		return nil
-	}
-
 	conv, err := convert.Convert(in, cty.Map(cty.String))
 	if err != nil {
 		return err

util/buildflags/cache_test.go

@@ -37,7 +37,7 @@ func TestCacheOptions_DerivedVars(t *testing.T) {
 				"session_token":     "not_a_mitm_attack",
 			},
 		},
-	}, cacheFrom)
+	}, cacheFrom.ToPB())
 }
 
 func TestCacheOptions(t *testing.T) {
@@ -109,3 +109,12 @@ func TestCacheOptions(t *testing.T) {
 		require.True(t, result.True())
 	})
 }
+
+func TestCacheOptions_RefOnlyFormat(t *testing.T) {
+	opts, err := ParseCacheEntry([]string{"ref1", "ref2"})
+	require.NoError(t, err)
+	require.Equal(t, CacheOptions{
+		{Type: "registry", Attrs: map[string]string{"ref": "ref1"}},
+		{Type: "registry", Attrs: map[string]string{"ref": "ref2"}},
+	}, opts)
+}