feat(multiwerf): print multiwerf deprecation warning if multiwerf out…

…dated

cmd/werf/build/main.go

@@ -126,6 +126,8 @@ If one or more IMAGE_NAME parameters specified, werf will build only these image
 }
 
 func runMain(ctx context.Context, args []string) error {
+	global_warnings.PostponeMultiwerfNotUpToDateWarning()
+
 	if err := werf.Init(*commonCmdData.TmpDir, *commonCmdData.HomeDir); err != nil {
 		return fmt.Errorf("initialization error: %s", err)
 	}

cmd/werf/bundle/apply/apply.go

@@ -103,6 +103,8 @@ func NewCmd() *cobra.Command {
 func runApply() error {
 	ctx := common.BackgroundContext()
 
+	global_warnings.PostponeMultiwerfNotUpToDateWarning()
+
 	if err := werf.Init(*commonCmdData.TmpDir, *commonCmdData.HomeDir); err != nil {
 		return fmt.Errorf("initialization error: %s", err)
 	}

cmd/werf/bundle/publish/publish.go

@@ -142,6 +142,8 @@ Published into container registry bundle can be rolled out by the "werf bundle"
 }
 
 func runPublish(ctx context.Context) error {
+	global_warnings.PostponeMultiwerfNotUpToDateWarning()
+
 	if err := werf.Init(*commonCmdData.TmpDir, *commonCmdData.HomeDir); err != nil {
 		return fmt.Errorf("initialization error: %s", err)
 	}

cmd/werf/converge/converge.go

@@ -162,6 +162,8 @@ werf converge --repo registry.mydomain.com/web --env production`,
 }
 
 func runMain(ctx context.Context) error {
+	global_warnings.PostponeMultiwerfNotUpToDateWarning()
+
 	if err := werf.Init(*commonCmdData.TmpDir, *commonCmdData.HomeDir); err != nil {
 		return fmt.Errorf("initialization error: %s", err)
 	}

cmd/werf/run/run.go

@@ -215,6 +215,8 @@ func getContainerName() string {
 }
 
 func runMain(ctx context.Context) error {
+	global_warnings.PostponeMultiwerfNotUpToDateWarning()
+
 	if err := werf.Init(*commonCmdData.TmpDir, *commonCmdData.HomeDir); err != nil {
 		return fmt.Errorf("initialization error: %s", err)
 	}

pkg/werf/global_warnings/global_warnings.go

@@ -1,11 +1,18 @@
 package global_warnings
 
 import (
+	"bytes"
 	"context"
+	"fmt"
+	"os/exec"
+	"regexp"
 
+	"github.com/Masterminds/semver"
 	"github.com/werf/logboek"
 )
 
+const LastMultiwerfVersion = "1.5.0"
+
 var GlobalWarningLines []string
 
 func PrintGlobalWarnings(ctx context.Context) {
@@ -19,6 +26,56 @@ func GlobalWarningLn(ctx context.Context, line string) {
 	printGlobalWarningLn(ctx, line)
 }
 
+func IsMultiwerfUpToDate() (bool, error) {
+	multiwerfPath, err := exec.LookPath("multiwerf")
+	if err != nil {
+		return true, nil
+	}
+
+	cmd := exec.Command(multiwerfPath, "version")
+	var stdout bytes.Buffer
+	cmd.Stdout = &stdout
+	if err := cmd.Run(); err != nil {
+		return false, fmt.Errorf("unable to get installed version of multiwerf: %s", err)
+	}
+
+	versionRegex := regexp.MustCompile(`^multiwerf v([.0-9]+)\s*$`)
+	regexResult := versionRegex.FindStringSubmatch(stdout.String())
+	if len(regexResult) != 2 {
+		return false, fmt.Errorf("\"multiwerf version\" returned unexpected output: %s", stdout.String())
+	}
+	installedMultiwerfVersion, err := semver.NewVersion(regexResult[1])
+	if err != nil {
+		return false, fmt.Errorf("unable to parse version of installed multiwerf version: %s", err)
+	}
+
+	lastMultiwerfVersion, err := semver.NewVersion(LastMultiwerfVersion)
+	if err != nil {
+		return false, fmt.Errorf("unable to parse version of last available multiwerf version: %s", err)
+	}
+
+	return !installedMultiwerfVersion.LessThan(lastMultiwerfVersion), nil
+}
+
+func PostponeMultiwerfNotUpToDateWarning() {
+	if multiwerfIsUpToDate, err := IsMultiwerfUpToDate(); err != nil {
+		GlobalWarningLines = append(
+			GlobalWarningLines,
+			fmt.Sprintf("Failure detecting whether multiwerf (if present) is outdated: %s", err),
+			"Multiwerf is deprecated, so if you are still using it we strongly recommend removing multiwerf and switching to trdl by following these instructions: https://werf.io/installation.html",
+		)
+		return
+	} else if multiwerfIsUpToDate {
+		return
+	}
+
+	GlobalWarningLines = append(
+		GlobalWarningLines,
+		"Multiwerf detected, but is out of date. Multiwerf is deprecated in favor of trdl: https://github.com/werf/trdl",
+		"If you are still using multiwerf we strongly recommend removing multiwerf and switching to trdl by following these instructions: https://werf.io/installation.html",
+	)
+}
+
 func printGlobalWarningLn(ctx context.Context, line string) {
 	logboek.Context(ctx).Error().LogF("WARNING: %s\n", line)
 }