Add test util to resolve Kubernetes versions

Signed-off-by: Stefan Büringer buringerst@vmware.com

test/framework/kubernetesversions/versions.go

@@ -28,44 +28,77 @@ import (
 )
 
 const (
-	ciVersionURL     = "https://dl.k8s.io/ci/latest.txt"
-	stableVersionURL = "https://dl.k8s.io/release/stable-%d.%d.txt"
-	tagPrefix        = "v"
+	ciLatestVersionURL = "https://dl.k8s.io/ci/latest.txt"
+	stableVersionURL   = "https://dl.k8s.io/release/stable-%s.txt"
+	ciVersionURL       = "https://dl.k8s.io/ci/latest-%s.txt"
+	tagPrefix          = "v"
 )
 
 // LatestCIRelease fetches the latest main branch Kubernetes version.
 func LatestCIRelease() (string, error) {
+	return getVersionFromMarkerFile(context.TODO(), ciLatestVersionURL)
+}
+
+// LatestPatchRelease returns the latest patch release matching.
+func LatestPatchRelease(searchVersion string) (string, error) {
 	ctx := context.TODO()
 
-	req, err := http.NewRequestWithContext(ctx, http.MethodGet, ciVersionURL, http.NoBody)
+	searchSemVer, err := semver.Make(strings.TrimPrefix(searchVersion, tagPrefix))
 	if err != nil {
-		return "", errors.Wrapf(err, "failed to get %s: failed to create request", ciVersionURL)
+		return "", err
 	}
 
-	resp, err := http.DefaultClient.Do(req)
-	if err != nil {
-		return "", errors.Wrapf(err, "failed to get %s", ciVersionURL)
-	}
-	defer resp.Body.Close()
-	b, err := io.ReadAll(resp.Body)
+	url := fmt.Sprintf(stableVersionURL, fmt.Sprintf("%d.%d", searchSemVer.Major, searchSemVer.Minor))
+
+	return getVersionFromMarkerFile(ctx, url)
+}
+
+// PreviousMinorRelease returns the latest patch release for the previous version
+// of Kubernetes, e.g. v1.19.1 returns v1.18.8 as of Sep 2020.
+func PreviousMinorRelease(searchVersion string) (string, error) {
+	semVer, err := semver.Make(strings.TrimPrefix(searchVersion, tagPrefix))
 	if err != nil {
-		return "", errors.Wrapf(err, "failed to get %s: failed to read body", ciVersionURL)
+		return "", err
 	}
+	semVer.Minor--
 
-	return strings.TrimSpace(string(b)), nil
+	return LatestPatchRelease(semVer.String())
 }
 
-// LatestPatchRelease returns the latest patch release matching.
-func LatestPatchRelease(searchVersion string) (string, error) {
-	ctx := context.TODO()
+// ResolveVersion resolves Kubernetes versions.
+// These are usually used to configure job in test-infra to test various upgrades.
+// Versions can have the following formats:
+// * v1.28.0 => will return the same version for convenience
+// * stable-1.28 => will return the latest patch release for v1.28, e.g. v1.28.5
+// * ci/latest-1.28 => will return the latest built version from the release branch, e.g. v1.28.5-26+72feddd3acde14
+// This implementation mirrors what is implemented in ci-e2e-lib.sh k8s::resolveVersion().
+func ResolveVersion(ctx context.Context, version string) (string, error) {
+	if strings.HasPrefix(version, "v") {
+		// version is already a version
+		return version, nil
+	}
 
-	searchSemVer, err := semver.Make(strings.TrimPrefix(searchVersion, tagPrefix))
+	url, err := calculateURL(version)
 	if err != nil {
 		return "", err
 	}
 
-	url := fmt.Sprintf(stableVersionURL, searchSemVer.Major, searchSemVer.Minor)
+	return getVersionFromMarkerFile(ctx, url)
+}
+
+func calculateURL(version string) (string, error) {
+	if strings.HasPrefix(version, "stable-") {
+		return fmt.Sprintf(stableVersionURL, strings.TrimPrefix(version, "stable-")), nil
+	}
+
+	if strings.HasPrefix(version, "ci/latest-") {
+		return fmt.Sprintf(ciVersionURL, strings.TrimPrefix(version, "ci/latest-")), nil
+	}
+
+	return "", fmt.Errorf("failed to resolve version %s", version)
+}
 
+func getVersionFromMarkerFile(ctx context.Context, url string) (string, error) {
 	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, http.NoBody)
 	if err != nil {
 		return "", errors.Wrapf(err, "failed to get %s: failed to create request", url)
@@ -82,15 +115,3 @@ func LatestPatchRelease(searchVersion string) (string, error) {
 
 	return strings.TrimSpace(string(b)), nil
 }
-
-// PreviousMinorRelease returns the latest patch release for the previous version
-// of Kubernetes, e.g. v1.19.1 returns v1.18.8 as of Sep 2020.
-func PreviousMinorRelease(searchVersion string) (string, error) {
-	semVer, err := semver.Make(strings.TrimPrefix(searchVersion, tagPrefix))
-	if err != nil {
-		return "", err
-	}
-	semVer.Minor--
-
-	return LatestPatchRelease(semVer.String())
-}

test/framework/kubernetesversions/versions_test.go

@@ -0,0 +1,58 @@
+/*
+Copyright 2024 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package kubernetesversions
+
+import (
+	"testing"
+)
+
+func Test_calculateURL(t *testing.T) {
+	tests := []struct {
+		name    string
+		version string
+		want    string
+		wantErr bool
+	}{
+		{
+			name:    "Stable version",
+			version: "stable-1.29",
+			want:    "https://dl.k8s.io/release/stable-1.29.txt",
+		},
+		{
+			name:    "CI version",
+			version: "ci/latest-1.30",
+			want:    "https://dl.k8s.io/ci/latest-1.30.txt",
+		},
+		{
+			name:    "Invalid version",
+			version: "abc",
+			wantErr: true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := calculateURL(tt.version)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("calculateURL() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if got != tt.want {
+				t.Errorf("calculateURL() got = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}