ci: skip E2E tests for docs and YAML-only changes

Author: Gautam3994

test/e2e/alphagenerate/e2e_suite_test.go

@@ -22,6 +22,8 @@ import (
 
 	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
+
+	"sigs.k8s.io/kubebuilder/v4/test/e2e/utils"
 )
 
 // Run e2e tests using the Ginkgo runner.
@@ -30,3 +32,14 @@ func TestE2E(t *testing.T) {
 	_, _ = fmt.Fprintf(GinkgoWriter, "Starting kubebuilder suite test for the alpha command generate\n")
 	RunSpecs(t, "Kubebuilder alpha generate suite")
 }
+
+var _ = BeforeSuite(func() {
+	run, why, _ := utils.ShouldRun(utils.Options{
+		RepoRoot:           ".",
+		Includes:           []string{"pkg/cli/alpha/", "test/e2e/alphagenerate/"},
+		SkipIfOnlyDocsYAML: true,
+	})
+	if !run {
+		Skip("skip: " + why)
+	}
+})

test/e2e/alphaupdate/e2e_suite_test.go

@@ -22,6 +22,8 @@ import (
 
 	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
+
+	"sigs.k8s.io/kubebuilder/v4/test/e2e/utils"
 )
 
 // Run e2e tests using the Ginkgo runner.
@@ -30,3 +32,14 @@ func TestE2E(t *testing.T) {
 	_, _ = fmt.Fprintf(GinkgoWriter, "Starting kubebuilder suite test for the alpha update command\n")
 	RunSpecs(t, "Kubebuilder alpha update suite")
 }
+
+var _ = BeforeSuite(func() {
+	run, why, _ := utils.ShouldRun(utils.Options{
+		RepoRoot:           ".",
+		Includes:           []string{"pkg/cli/alpha/", "test/e2e/alphaupdate/"},
+		SkipIfOnlyDocsYAML: true,
+	})
+	if !run {
+		Skip("skip: " + why)
+	}
+})

test/e2e/utils/suite_filter.go

@@ -0,0 +1,241 @@
+/*
+Copyright 2025 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 utils
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
+	"log"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"regexp"
+	"strings"
+	"time"
+)
+
+// Options defines filters and behavior for change detection.
+type Options struct {
+	RepoRoot           string
+	Includes           []string
+	IncludeIsRegex     bool
+	SkipIfOnlyDocsYAML bool
+	BaseEnvVar         string
+	HeadEnvVar         string
+	ChangedFilesEnvVar string
+}
+
+// changedFiles holds a normalized list of changed file paths.
+type changedFiles struct {
+	files []string
+}
+
+// ShouldRun determines whether the current E2E suite should run, returning a boolean,
+// a human-readable reason, and an error if one occurred.
+func ShouldRun(opts Options) (bool, string, error) {
+	validateAndNormalizeOpts(&opts)
+	// Check CI environment first.
+	if raw := strings.TrimSpace(os.Getenv(opts.ChangedFilesEnvVar)); raw != "" {
+		return decide(parseChangedFiles(raw), opts)
+	}
+
+	base := os.Getenv(opts.BaseEnvVar)
+	head := os.Getenv(opts.HeadEnvVar)
+	if head == "" {
+		head = "HEAD"
+	}
+
+	cwd, headDiffErr := os.Getwd()
+	if headDiffErr != nil {
+		log.Fatalf("failed to get current working directory: %v", headDiffErr)
+	}
+	// restore original directory at the end
+	defer func(originalDir string) {
+		if chdirErr := os.Chdir(originalDir); chdirErr != nil {
+			log.Printf("WARNING: failed to restore working directory to %q: %v", originalDir, chdirErr)
+		}
+	}(cwd)
+
+	// Confirm RepoRoot exists.
+	if info, statErr := os.Stat(opts.RepoRoot); statErr != nil {
+		return true, "repo root path invalid or inaccessible", fmt.Errorf("stat repo root: %w", statErr)
+	} else if !info.IsDir() {
+		return true, "repo root path is not a directory", errors.New("repo root not a directory")
+	}
+
+	// Resolve base commit SHA if not set.
+	if base == "" {
+		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+		defer cancel()
+
+		if fetchErr := gitFetchOriginMaster(ctx, opts.RepoRoot); fetchErr != nil {
+			// log warning, but don't fail; fallback handled below
+			logWarning(fmt.Sprintf("git fetch origin/master failed: %v", fetchErr))
+		}
+
+		b, resolveBaseErr := gitResolveBaseRef(ctx, opts.RepoRoot, head)
+		if resolveBaseErr == nil && b != "" {
+			base = b
+		} else {
+			base = head + "~1" // fallback
+		}
+	}
+
+	// Diff changed files between base and head.
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	out, baseDiffErr := gitDiffNames(ctx, opts.RepoRoot, base, head)
+	if baseDiffErr != nil {
+		// fallback to diff head~1. head
+		out, headDiffErr = gitDiffNames(ctx, opts.RepoRoot, head+"~1", head)
+		if headDiffErr != nil {
+			return true, "diff failed; default to run", fmt.Errorf("git diff failed: %w", headDiffErr)
+		}
+	}
+
+	return decide(parseChangedFiles(string(out)), opts)
+}
+
+func validateAndNormalizeOpts(opts *Options) {
+	if opts.RepoRoot == "" {
+		opts.RepoRoot = "."
+	}
+	if opts.BaseEnvVar == "" {
+		opts.BaseEnvVar = "PULL_BASE_SHA"
+	}
+	if opts.HeadEnvVar == "" {
+		opts.HeadEnvVar = "PULL_PULL_SHA"
+	}
+	if opts.ChangedFilesEnvVar == "" {
+		opts.ChangedFilesEnvVar = "KUBEBUILDER_CHANGED_FILES"
+	}
+}
+
+func logWarning(msg string) {
+	_, err := fmt.Fprintf(os.Stderr, "WARNING: %s\n", msg)
+	if err != nil {
+		return
+	}
+}
+
+// parseChangedFiles splits raw changed file data into normalized paths.
+func parseChangedFiles(raw string) changedFiles {
+	lines := strings.Split(strings.TrimSpace(raw), "\n")
+	files := make([]string, 0, len(lines))
+	for _, line := range lines {
+		line = strings.TrimSpace(line)
+		if line != "" {
+			files = append(files, filepath.ToSlash(line))
+		}
+	}
+	return changedFiles{files: files}
+}
+
+// decide determines if the suite should run based on changed files and options.
+func decide(ch changedFiles, opts Options) (bool, string, error) {
+	if len(ch.files) == 0 {
+		return true, "no changes detected; running tests", nil
+	}
+
+	if opts.SkipIfOnlyDocsYAML && onlyDocsOrYAML(ch.files) {
+		return false, "only documentation or YAML files changed; skipping tests", nil
+	}
+
+	if len(opts.Includes) == 0 {
+		return true, "no include filters specified; running tests", nil
+	}
+
+	if opts.IncludeIsRegex {
+		pattern := "^(" + strings.Join(opts.Includes, "|") + ")"
+		re, err := regexp.Compile(pattern)
+		if err != nil {
+			return false, "invalid include regex pattern", fmt.Errorf("compile regex %q: %w", pattern, err)
+		}
+
+		for _, file := range ch.files {
+			if re.MatchString(file) {
+				return true, "matched include regex pattern: " + re.String(), nil
+			}
+		}
+		return false, "no files matched include regex patterns", nil
+	}
+
+	for _, file := range ch.files {
+		for _, include := range opts.Includes {
+			if strings.HasPrefix(file, filepath.ToSlash(include)) {
+				return true, "matched include prefix: " + include, nil
+			}
+		}
+	}
+
+	return false, "no files matched include prefixes", nil
+}
+
+func onlyDocsOrYAML(files []string) bool {
+	pattern := `(?i)(^docs/|\.md$|\.markdown$|^\.github/|` +
+		`(OWNERS|OWNERS_ALIASES|SECURITY_CONTACTS|LICENSE)(\.md)?$|\.ya?ml$)`
+	re := regexp.MustCompile(pattern)
+	for _, file := range files {
+		if !re.MatchString(file) {
+			return false
+		}
+	}
+	return true
+}
+
+// gitFetchOriginMaster runs `git fetch origin master --quiet`.
+func gitFetchOriginMaster(ctx context.Context, repoRoot string) error {
+	cmd := exec.CommandContext(ctx, "git", "fetch", "origin", "master", "--quiet")
+	cmd.Dir = repoRoot
+	if originFetchErr := cmd.Run(); originFetchErr != nil {
+		return fmt.Errorf("git fetch origin master failed: %w", originFetchErr)
+	}
+	return nil
+}
+
+// gitResolveBaseRef returns the merge-base commit SHA of head and origin/master.
+func gitResolveBaseRef(ctx context.Context, repoRoot, head string) (string, error) {
+	cmd := exec.CommandContext(ctx, "git", "rev-parse", "--verify", "--quiet", "origin/master")
+	cmd.Dir = repoRoot
+	out, err := cmd.CombinedOutput()
+	if err != nil || len(bytes.TrimSpace(out)) == 0 {
+		return "", errors.New("origin/master ref not found")
+	}
+
+	mergeBaseCmd := exec.CommandContext(ctx, "git", "merge-base", head, "origin/master")
+	mergeBaseCmd.Dir = repoRoot
+	mbOut, err := mergeBaseCmd.Output()
+	if err != nil {
+		return "", fmt.Errorf("git merge-base failed: %w", err)
+	}
+
+	return strings.TrimSpace(string(mbOut)), nil
+}
+
+// gitDiffNames returns the list of changed files between base and head commits.
+func gitDiffNames(ctx context.Context, repoRoot, base, head string) ([]byte, error) {
+	cmd := exec.CommandContext(ctx, "git", "diff", "--name-only", base, head)
+	cmd.Dir = repoRoot
+	out, outErr := cmd.Output()
+	if outErr != nil {
+		return nil, fmt.Errorf("git diff failed: %w", outErr)
+	}
+	return out, nil
+}