fix: refer correct version of schema in func.yaml (#2924)

Signed-off-by: Matej Vašek <mvasek@redhat.com>

Makefile

@@ -28,7 +28,7 @@ VTAG         := $(shell [ -z $(VTAG) ] && echo $(ETAG) || echo $(VTAG))
 VERS         ?= $(shell git describe --tags --match 'v*')
 KVER         ?= $(shell git describe --tags --match 'knative-*')
 
-LDFLAGS      := -X knative.dev/func/pkg/app.vers=$(VERS) -X knative.dev/func/pkg/app.kver=$(KVER) -X knative.dev/func/pkg/app.hash=$(HASH)
+LDFLAGS      := -X knative.dev/func/pkg/version.Vers=$(VERS) -X knative.dev/func/pkg/version.Kver=$(KVER) -X knative.dev/func/pkg/version.Hash=$(HASH)
 
 FUNC_UTILS_IMG ?= ghcr.io/knative/func-utils:v2
 LDFLAGS += -X knative.dev/func/pkg/k8s.SocatImage=$(FUNC_UTILS_IMG)

go.mod

@@ -11,6 +11,7 @@ require (
 	github.com/Microsoft/go-winio v0.6.2
 	github.com/Netflix/go-expect v0.0.0-20220104043353-73e0943537d2
 	github.com/alecthomas/jsonschema v0.0.0-20220216202328-9eeeec9d044b
+	github.com/blang/semver/v4 v4.0.0
 	github.com/buildpacks/pack v0.36.4
 	github.com/chainguard-dev/git-urls v1.0.2
 	github.com/cloudevents/sdk-go/v2 v2.15.2
@@ -111,7 +112,6 @@ require (
 	github.com/aws/smithy-go v1.22.2 // indirect
 	github.com/awslabs/amazon-ecr-credential-helper/ecr-login v0.0.0-20250205235911-d2398ba46815 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/blang/semver/v4 v4.0.0 // indirect
 	github.com/blendle/zapdriver v1.3.1 // indirect
 	github.com/buildpacks/imgutil v0.0.0-20240605145725-186f89b2d168 // indirect
 	github.com/buildpacks/libcnb v1.30.3 // indirect

pkg/app/app.go

@@ -10,12 +10,12 @@ import (
 	"syscall"
 
 	"github.com/AlecAivazis/survey/v2/terminal"
+
 	"knative.dev/func/cmd"
 	"knative.dev/func/pkg/docker"
+	"knative.dev/func/pkg/version"
 )
 
-var vers, kver, hash string
-
 func Main() {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
@@ -32,9 +32,9 @@ func Main() {
 	cfg := cmd.RootCommandConfig{
 		Name: "func",
 		Version: cmd.Version{
-			Vers: vers,
-			Kver: kver,
-			Hash: hash,
+			Vers: version.Vers,
+			Kver: version.Kver,
+			Hash: version.Hash,
 		}}
 
 	if err := cmd.NewRootCmd(cfg).ExecuteContext(ctx); err != nil {

pkg/functions/function.go

@@ -10,9 +10,12 @@ import (
 	"strings"
 	"time"
 
+	"github.com/blang/semver/v4"
 	"github.com/google/go-containerregistry/pkg/name"
 	"gopkg.in/yaml.v2"
+
 	fnlabels "knative.dev/func/pkg/k8s/labels"
+	"knative.dev/func/pkg/version"
 	"knative.dev/pkg/ptr"
 )
 
@@ -444,12 +447,12 @@ func (f Function) Write() (err error) {
 	}
 	defer rwFile.Close()
 
-	tagVersion := f.SpecVersion
+	schemaURI := funcYamlSchemaURI()
 
 	// Write schema header
-	schemaHeader := fmt.Sprintf(`# $schema: https://raw.githubusercontent.com/knative/func/refs/tags/v%s/schema/func_yaml-schema.json
-# yaml-language-server: $schema=https://raw.githubusercontent.com/knative/func/refs/tags/v%s/schema/func_yaml-schema.json
-`, tagVersion, tagVersion)
+	schemaHeader := fmt.Sprintf(`# $schema: %s
+# yaml-language-server: $schema=%s
+`, schemaURI, schemaURI)
 
 	if _, err = rwFile.WriteString(schemaHeader); err != nil {
 		return err
@@ -479,6 +482,25 @@ func (f Function) Write() (err error) {
 	return
 }
 
+func funcYamlSchemaURI() string {
+	var (
+		ref  = "main"
+		kver semver.Version
+		err  error
+	)
+	kver, err = semver.Parse(strings.TrimPrefix(version.Kver, "knative-v"))
+	if err == nil {
+		ref = fmt.Sprintf("release-%d.%d", kver.Major, kver.Minor)
+	} else {
+		if version.Hash != "" {
+			ref = version.Hash
+		}
+	}
+
+	return fmt.Sprintf("https://raw.githubusercontent.com/knative/func"+
+		"/%s/schema/func_yaml-schema.json", ref)
+}
+
 type stampOptions struct{ journal bool }
 type stampOption func(o *stampOptions)
 

pkg/version/version.go

@@ -0,0 +1,3 @@
+package version
+
+var Vers, Kver, Hash string