move unwanted console output out of versiongetter.

cmd/kubeadm/app/cmd/upgrade/common.go

@@ -157,7 +157,7 @@ func enforceRequirements(flags *applyPlanFlags, dryRun bool, newK8sVersion strin
 	}
 
 	// Use a real version getter interface that queries the API server, the kubeadm client and the Kubernetes CI system for latest versions
-	return client, upgrade.NewOfflineVersionGetter(upgrade.NewKubeVersionGetter(client, os.Stdout), newK8sVersion), cfg, nil
+	return client, upgrade.NewOfflineVersionGetter(upgrade.NewKubeVersionGetter(client), newK8sVersion), cfg, nil
 }
 
 // printConfiguration prints the external version of the API to yaml

cmd/kubeadm/app/phases/upgrade/compute.go

@@ -85,12 +85,14 @@ func GetAvailableUpgrades(versionGetterImpl VersionGetter, experimentalUpgradesA
 	if err != nil {
 		return upgrades, err
 	}
+	fmt.Printf("[upgrade/versions] Cluster version: %s\n", clusterVersionStr)
 
 	// Get current kubeadm CLI version
 	kubeadmVersionStr, kubeadmVersion, err := versionGetterImpl.KubeadmVersion()
 	if err != nil {
 		return upgrades, err
 	}
+	fmt.Printf("[upgrade/versions] kubeadm version: %s\n", kubeadmVersionStr)
 
 	// Get and output the current latest stable version
 	stableVersionStr, stableVersion, err := versionGetterImpl.VersionFromCILabel("stable", "stable version")
@@ -98,6 +100,8 @@ func GetAvailableUpgrades(versionGetterImpl VersionGetter, experimentalUpgradesA
 		fmt.Printf("[upgrade/versions] WARNING: %v\n", err)
 		fmt.Println("[upgrade/versions] WARNING: Falling back to current kubeadm version as latest stable version")
 		stableVersionStr, stableVersion = kubeadmVersionStr, kubeadmVersion
+	} else {
+		fmt.Printf("[upgrade/versions] Latest %s: %s\n", "stable version", stableVersionStr)
 	}
 
 	// Get the kubelet versions in the cluster
@@ -144,6 +148,8 @@ func GetAvailableUpgrades(versionGetterImpl VersionGetter, experimentalUpgradesA
 		if err != nil {
 			fmt.Printf("[upgrade/versions] WARNING: %v\n", err)
 		} else {
+			fmt.Printf("[upgrade/versions] Latest %s: %s\n", description, patchVersionStr)
+
 			// Check if a minor version upgrade is possible when a patch release exists
 			// It's only possible if the latest patch version is higher than the current patch version
 			// If that's the case, they must be on different branches => a newer minor version can be upgraded to
@@ -211,6 +217,7 @@ func GetAvailableUpgrades(versionGetterImpl VersionGetter, experimentalUpgradesA
 		if err != nil {
 			return upgrades, err
 		}
+		fmt.Printf("[upgrade/versions] Latest %s: %s\n", "experimental version", latestVersionStr)
 
 		minorUnstable := latestVersion.Components()[1]
 		// Get and output the current latest unstable version
@@ -219,6 +226,7 @@ func GetAvailableUpgrades(versionGetterImpl VersionGetter, experimentalUpgradesA
 		if err != nil {
 			return upgrades, err
 		}
+		fmt.Printf("[upgrade/versions] Latest %s: %s\n", "", previousBranchLatestVersionStr)
 
 		// If that previous latest version is an RC, RCs are allowed and the cluster version is lower than the RC version, show the upgrade
 		if rcUpgradesAllowed && rcUpgradePossible(clusterVersion, previousBranchLatestVersion) {

cmd/kubeadm/app/phases/upgrade/policy.go

@@ -17,6 +17,7 @@ limitations under the License.
 package upgrade
 
 import (
+	"fmt"
 	"strings"
 
 	"github.com/pkg/errors"
@@ -56,6 +57,7 @@ func EnforceVersionPolicies(versionGetter VersionGetter, newK8sVersionStr string
 		skewErrors.Mandatory = append(skewErrors.Mandatory, errors.Wrap(err, "Unable to fetch cluster version"))
 		return skewErrors
 	}
+	fmt.Printf("[upgrade/versions] Cluster version: %s\n", clusterVersionStr)
 
 	kubeadmVersionStr, kubeadmVersion, err := versionGetter.KubeadmVersion()
 	if err != nil {
@@ -63,6 +65,7 @@ func EnforceVersionPolicies(versionGetter VersionGetter, newK8sVersionStr string
 		skewErrors.Mandatory = append(skewErrors.Mandatory, errors.Wrap(err, "Unable to fetch kubeadm version"))
 		return skewErrors
 	}
+	fmt.Printf("[upgrade/versions] kubeadm version: %s\n", kubeadmVersionStr)
 
 	kubeletVersions, err := versionGetter.KubeletVersions()
 	if err != nil {

cmd/kubeadm/app/phases/upgrade/versiongetter.go

@@ -18,8 +18,6 @@ package upgrade
 
 import (
 	"fmt"
-	"io"
-
 	"github.com/pkg/errors"
 
 	"k8s.io/api/core/v1"
@@ -46,14 +44,12 @@ type VersionGetter interface {
 // KubeVersionGetter handles the version-fetching mechanism from external sources
 type KubeVersionGetter struct {
 	client clientset.Interface
-	w      io.Writer
 }
 
 // NewKubeVersionGetter returns a new instance of KubeVersionGetter
-func NewKubeVersionGetter(client clientset.Interface, writer io.Writer) VersionGetter {
+func NewKubeVersionGetter(client clientset.Interface) VersionGetter {
 	return &KubeVersionGetter{
 		client: client,
-		w:      writer,
 	}
 }
 
@@ -63,7 +59,6 @@ func (g *KubeVersionGetter) ClusterVersion() (string, *versionutil.Version, erro
 	if err != nil {
 		return "", nil, errors.Wrap(err, "Couldn't fetch cluster version from the API Server")
 	}
-	fmt.Fprintf(g.w, "[upgrade/versions] Cluster version: %s\n", clusterVersionInfo.String())
 
 	clusterVersion, err := versionutil.ParseSemantic(clusterVersionInfo.String())
 	if err != nil {
@@ -75,7 +70,6 @@ func (g *KubeVersionGetter) ClusterVersion() (string, *versionutil.Version, erro
 // KubeadmVersion gets kubeadm version
 func (g *KubeVersionGetter) KubeadmVersion() (string, *versionutil.Version, error) {
 	kubeadmVersionInfo := version.Get()
-	fmt.Fprintf(g.w, "[upgrade/versions] kubeadm version: %s\n", kubeadmVersionInfo.String())
 
 	kubeadmVersion, err := versionutil.ParseSemantic(kubeadmVersionInfo.String())
 	if err != nil {
@@ -91,10 +85,6 @@ func (g *KubeVersionGetter) VersionFromCILabel(ciVersionLabel, description strin
 		return "", nil, errors.Wrapf(err, "Couldn't fetch latest %s from the internet", description)
 	}
 
-	if description != "" {
-		fmt.Fprintf(g.w, "[upgrade/versions] Latest %s: %s\n", description, versionStr)
-	}
-
 	ver, err := versionutil.ParseSemantic(versionStr)
 	if err != nil {
 		return "", nil, errors.Wrapf(err, "Couldn't parse latest %s", description)
@@ -143,7 +133,11 @@ func NewOfflineVersionGetter(versionGetter VersionGetter, version string) Versio
 // VersionFromCILabel will return the version that was passed into the struct
 func (o *OfflineVersionGetter) VersionFromCILabel(ciVersionLabel, description string) (string, *versionutil.Version, error) {
 	if o.version == "" {
-		return o.VersionGetter.VersionFromCILabel(ciVersionLabel, description)
+		versionStr, version, err := o.VersionGetter.VersionFromCILabel(ciVersionLabel, description)
+		if err == nil {
+			fmt.Printf("[upgrade/versions] Latest %s: %s\n", description, versionStr)
+		}
+		return versionStr, version, err
 	}
 	ver, err := versionutil.ParseSemantic(o.version)
 	if err != nil {