Fix check flake by not using Github API

hack/versions/pkg/version/version.go

@@ -17,15 +17,15 @@ limitations under the License.
 package version
 
 import (
-	"context"
 	"fmt"
 	"io/ioutil"
 	"net/http"
 	"regexp"
 	"strings"
 
+	"github.com/GoogleContainerTools/skaffold/pkg/skaffold/update"
+
 	"github.com/GoogleContainerTools/skaffold/pkg/skaffold/schema/latest"
-	"github.com/google/go-github/github"
 	"github.com/sirupsen/logrus"
 )
 
@@ -40,12 +40,10 @@ func GetLatestVersion() (string, bool) {
 }
 
 func getLastReleasedConfigVersion() string {
-	client := github.NewClient(nil)
-	releases, _, err := client.Repositories.ListReleases(context.Background(), "GoogleContainerTools", "skaffold", &github.ListOptions{})
+	lastTag, err := update.DownloadLatestVersion()
 	if err != nil {
-		logrus.Fatalf("error listing Github releases: %s", err)
+		logrus.Fatalf("error getting latest version: %s", err)
 	}
-	lastTag := *releases[0].TagName
 	logrus.Infof("last release tag: %s", lastTag)
 	configURL := fmt.Sprintf("https://raw.githubusercontent.com/GoogleContainerTools/skaffold/%s/pkg/skaffold/schema/latest/config.go", lastTag)
 	resp, err := http.Get(configURL)

pkg/skaffold/update/update.go

@@ -36,7 +36,7 @@ var (
 	getEnv                     = os.Getenv
 )
 
-const latestVersionURL = "https://storage.googleapis.com/skaffold/releases/latest/VERSION"
+const LatestVersionURL = "https://storage.googleapis.com/skaffold/releases/latest/VERSION"
 
 // IsUpdateCheckEnabled returns whether or not the update check is enabled
 // It is true by default, but setting it to any other value than true will disable the check
@@ -60,19 +60,11 @@ func isUpdateCheckEnabledByEnvOrConfig(configfile string) bool {
 // and returns it with the current version of Skaffold
 func getLatestAndCurrentVersion() (semver.Version, semver.Version, error) {
 	none := semver.Version{}
-	resp, err := http.Get(latestVersionURL)
+	versionString, err := DownloadLatestVersion()
 	if err != nil {
-		return none, none, errors.Wrap(err, "getting latest version info from GCS")
+		return none, none, err
 	}
-	defer resp.Body.Close()
-	if resp.StatusCode != http.StatusOK {
-		return none, none, errors.Wrapf(err, "http %d, error: %s", resp.StatusCode, resp.Status)
-	}
-	versionBytes, err := ioutil.ReadAll(resp.Body)
-	if err != nil {
-		return none, none, errors.Wrap(err, "reading version file from GCS")
-	}
-	latest, err := version.ParseVersion(string(versionBytes))
+	latest, err := version.ParseVersion(versionString)
 	if err != nil {
 		return none, none, errors.Wrap(err, "parsing latest version from GCS")
 	}
@@ -82,3 +74,19 @@ func getLatestAndCurrentVersion() (semver.Version, semver.Version, error) {
 	}
 	return latest, current, nil
 }
+
+func DownloadLatestVersion() (string, error) {
+	resp, err := http.Get(LatestVersionURL)
+	if err != nil {
+		return "", errors.Wrap(err, "getting latest version info from GCS")
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		return "", errors.Wrapf(err, "http %d, error: %s", resp.StatusCode, resp.Status)
+	}
+	versionBytes, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return "", errors.Wrap(err, "reading version file from GCS")
+	}
+	return strings.TrimSuffix(string(versionBytes), "\n"), nil
+}