korg: add userinfo command for org and OWNERS lookup

  Adds `korg userinfo <user>...` to answer the recurring question this
  repo exists for: which Kubernetes orgs is a user in, what role, and
  where do they appear in OWNERS files.

  Sources:
  - GitHub user API for company / profile
  - config/<org>/org.yaml (Members / Admins) for k8s org membership
  - cs.k8s.io (hound) for OWNERS file references

  Behavior:
  - Honors GITHUB_TOKEN / GH_TOKEN to avoid the 60/hr unauth limit
  - Per-request context with a 30s timeout; SIGINT cancels in flight
  - Multi-user batches run concurrently (errgroup, bounded to 4) with
    output preserved in input order
  - One bad username does not kill the batch; per-user errors render
    and the process exits non-zero
  - Hound failures degrade to a warning instead of dropping org info
  - OWNERS results render as an aligned REPO / PATH / URL table; URL
    uses /blob/HEAD/ so the link resolves to the default branch
  - `--output json` for scripting

  Dependencies:
  - google/go-github v17 (untagged) -> v88
  - spf13/cobra v0.0.5 -> v1.10.2 (for ExecuteContext)
  - adds golang.org/x/sync for errgroup
  - go directive bumped to 1.22+

Signed-off-by: Nabarun Pal <pal.nabarun95@gmail.com>

Author: palnabarun

cmd/korg/korg.go

@@ -17,10 +17,13 @@ limitations under the License.
 package main
 
 import (
+	"context"
 	"fmt"
 	"os"
+	"os/signal"
 	"path/filepath"
 	"strings"
+	"syscall"
 
 	"github.com/spf13/cobra"
 )
@@ -58,6 +61,16 @@ Note: Removing from teams is currently unsupported.
 	`
 
 	auditHelpText = "Audit GitHub org members"
+
+	userinfoHelpText = `
+Gets k8s org membership, GitHub profile, and OWNERS file references for user(s).
+
+Honors GITHUB_TOKEN / GH_TOKEN for authenticated GitHub API access.
+
+	korg userinfo <github username>
+	korg userinfo <github username1> <github username2> <github username3> ...
+	korg userinfo --output json <github username>
+	`
 )
 
 type Options struct {
@@ -222,7 +235,29 @@ func main() {
 	rootCmd.AddCommand(removeCmd)
 	rootCmd.AddCommand(auditCmd)
 
-	if err := rootCmd.Execute(); err != nil {
+	var outputFormat string
+	userInfoCmd := &cobra.Command{
+		Use:   "userinfo",
+		Short: "Get information about user(s)",
+		Long:  userinfoHelpText,
+		Args:  cobra.MinimumNArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			switch outputFormat {
+			case "text", "json":
+			default:
+				return fmt.Errorf("invalid --output %q (want: text, json)", outputFormat)
+			}
+			return runUserinfo(cmd.Context(), o.RepoRoot, args, outputFormat == "json", cmd.OutOrStdout())
+		},
+	}
+	userInfoCmd.Flags().StringVarP(&outputFormat, "output", "o", "text", "output format: text|json")
+	rootCmd.AddCommand(userInfoCmd)
+
+	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer stop()
+
+	if err := rootCmd.ExecuteContext(ctx); err != nil {
+		fmt.Fprintln(os.Stderr, "error:", err)
 		os.Exit(1)
 	}
 }

cmd/korg/userinfo.go

@@ -0,0 +1,306 @@
+/*
+Copyright 2023 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 main
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"os"
+	"path/filepath"
+	"sort"
+	"text/tabwriter"
+	"time"
+
+	"github.com/google/go-github/v88/github"
+	houndclient "github.com/hound-search/hound/client"
+	"golang.org/x/sync/errgroup"
+	"sigs.k8s.io/prow/pkg/config/org"
+)
+
+const (
+	houndSearchURL      = "https://cs.k8s.io/api/v1/search"
+	defaultHTTPTimeout  = 30 * time.Second
+	userinfoConcurrency = 4
+)
+
+// Test-only overrides. Empty means use defaults / api.github.com.
+var (
+	houndSearchURLOverride string
+	ghBaseURLOverride      string
+)
+
+func houndURL() string {
+	if houndSearchURLOverride != "" {
+		return houndSearchURLOverride
+	}
+	return houndSearchURL
+}
+
+type OrgMembership struct {
+	Org  string `json:"org"`
+	Role string `json:"role"` // "member" or "admin"
+}
+
+type OwnerFile struct {
+	Repo string `json:"repo"`
+	Path string `json:"path"`
+	URL  string `json:"url"`
+}
+
+type UserDetails struct {
+	Username   string          `json:"username"`
+	Company    string          `json:"company,omitempty"`
+	Orgs       []OrgMembership `json:"orgs"`
+	OwnerFiles []OwnerFile     `json:"owner_files,omitempty"`
+	Warnings   []string        `json:"warnings,omitempty"`
+}
+
+// findUserDetails gathers GitHub profile, k8s org membership, and OWNERS file references for a username.
+// GitHub or k/org config failures are fatal (returned as error). Hound failures are non-fatal warnings.
+func findUserDetails(ctx context.Context, gh *github.Client, hc *http.Client, configs map[string]*org.Config, username string) (*UserDetails, error) {
+	info := &UserDetails{Username: username}
+
+	u, _, err := gh.Users.Get(ctx, username)
+	if err != nil {
+		return nil, fmt.Errorf("github user %q: %w", username, err)
+	}
+	if u.Company != nil {
+		info.Company = *u.Company
+	}
+
+	info.Orgs = findOrgMembership(configs, username)
+
+	files, err := searchOwnerFiles(ctx, hc, username)
+	if err != nil {
+		info.Warnings = append(info.Warnings, fmt.Sprintf("OWNERS lookup failed: %v", err))
+	} else {
+		info.OwnerFiles = files
+	}
+
+	return info, nil
+}
+
+func findOrgMembership(configs map[string]*org.Config, username string) []OrgMembership {
+	out := []OrgMembership{}
+	orgNames := make([]string, 0, len(configs))
+	for name := range configs {
+		orgNames = append(orgNames, name)
+	}
+	sort.Strings(orgNames)
+
+	for _, name := range orgNames {
+		cfg := configs[name]
+		switch {
+		case stringInSliceCaseAgnostic(cfg.Admins, username):
+			out = append(out, OrgMembership{Org: name, Role: "admin"})
+		case stringInSliceCaseAgnostic(cfg.Members, username):
+			out = append(out, OrgMembership{Org: name, Role: "member"})
+		}
+	}
+	return out
+}
+
+func loadOrgConfigs(repoRoot string, orgs []string) (map[string]*org.Config, error) {
+	out := make(map[string]*org.Config, len(orgs))
+	for _, name := range orgs {
+		path := filepath.Join(repoRoot, fmt.Sprintf(orgConfigPathFormat, name))
+		cfg, err := readConfig(path)
+		if err != nil {
+			return nil, fmt.Errorf("loading org config %s: %w", name, err)
+		}
+		out[name] = cfg
+	}
+	return out, nil
+}
+
+func ownerFileURL(repo, path string) string {
+	return fmt.Sprintf("https://github.com/%s/blob/HEAD/%s", repo, path)
+}
+
+func searchOwnerFiles(ctx context.Context, hc *http.Client, username string) ([]OwnerFile, error) {
+	q := url.Values{}
+	q.Set("q", username)
+	q.Set("repos", "*")
+	q.Set("rng", ":20")
+	q.Set("files", "OWNERS")
+	q.Set("excludeFiles", "vendor/")
+	q.Set("i", "true")
+	q.Set("stats", "true")
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, houndURL()+"?"+q.Encode(), nil)
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := hc.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode/100 != 2 {
+		snippet, _ := io.ReadAll(io.LimitReader(resp.Body, 256))
+		return nil, fmt.Errorf("hound %s: %s", resp.Status, bytes.TrimSpace(snippet))
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	var r houndclient.Response
+	if err := json.Unmarshal(body, &r); err != nil {
+		return nil, fmt.Errorf("decoding hound response: %w", err)
+	}
+
+	out := []OwnerFile{}
+	for repo, matches := range r.Results {
+		if matches == nil {
+			continue
+		}
+		for _, fm := range matches.Matches {
+			out = append(out, OwnerFile{
+				Repo: repo,
+				Path: fm.Filename,
+				URL:  ownerFileURL(repo, fm.Filename),
+			})
+		}
+	}
+	sort.Slice(out, func(i, j int) bool {
+		if out[i].Repo != out[j].Repo {
+			return out[i].Repo < out[j].Repo
+		}
+		return out[i].Path < out[j].Path
+	})
+	return out, nil
+}
+
+// renderText writes a human-readable form of UserDetails to w.
+func (u *UserDetails) renderText(w io.Writer) {
+	fmt.Fprintf(w, "\n=== %s\n", u.Username)
+	if u.Company != "" {
+		fmt.Fprintln(w, "Company:", u.Company)
+	} else {
+		fmt.Fprintln(w, "Company: **Not Found**")
+	}
+
+	fmt.Fprintln(w, "Orgs:")
+	if len(u.Orgs) == 0 {
+		fmt.Fprintln(w, "  (none)")
+	}
+	for _, m := range u.Orgs {
+		fmt.Fprintf(w, "  %s (%s)\n", m.Org, m.Role)
+	}
+
+	if len(u.OwnerFiles) > 0 {
+		fmt.Fprintln(w, "Owner Files:")
+		tw := tabwriter.NewWriter(w, 0, 0, 2, ' ', 0)
+		fmt.Fprintln(tw, "  REPO\tPATH\tURL")
+		for _, of := range u.OwnerFiles {
+			fmt.Fprintf(tw, "  %s\t%s\t%s\n", of.Repo, of.Path, of.URL)
+		}
+		tw.Flush()
+	}
+
+	for _, warn := range u.Warnings {
+		fmt.Fprintln(w, "Warning:", warn)
+	}
+}
+
+// newGitHubClient returns a GitHub client authenticated via GITHUB_TOKEN or GH_TOKEN if set.
+func newGitHubClient(ctx context.Context, httpClient *http.Client) (*github.Client, error) {
+	token := os.Getenv("GITHUB_TOKEN")
+	if token == "" {
+		token = os.Getenv("GH_TOKEN")
+	}
+	opts := []github.ClientOptionsFunc{}
+	if httpClient != nil {
+		opts = append(opts, github.WithHTTPClient(httpClient))
+	}
+	if token != "" {
+		opts = append(opts, github.WithAuthToken(token))
+	}
+	if ghBaseURLOverride != "" {
+		opts = append(opts, github.WithEnterpriseURLs(ghBaseURLOverride, ghBaseURLOverride))
+	}
+	return github.NewClient(opts...)
+}
+
+// runUserinfo fetches info for every username concurrently and writes ordered output to w.
+// Returns a joined error of all per-user failures; users without errors still render.
+func runUserinfo(ctx context.Context, repoRoot string, usernames []string, outputJSON bool, w io.Writer) error {
+	configs, err := loadOrgConfigs(repoRoot, validOrgs)
+	if err != nil {
+		return err
+	}
+
+	hc := &http.Client{Timeout: defaultHTTPTimeout}
+	gh, err := newGitHubClient(ctx, hc)
+	if err != nil {
+		return fmt.Errorf("building github client: %w", err)
+	}
+
+	results := make([]*UserDetails, len(usernames))
+	errs := make([]error, len(usernames))
+
+	g, gctx := errgroup.WithContext(ctx)
+	g.SetLimit(userinfoConcurrency)
+	for i, name := range usernames {
+		i, name := i, name
+		g.Go(func() error {
+			info, err := findUserDetails(gctx, gh, hc, configs, name)
+			if err != nil {
+				errs[i] = err
+				return nil
+			}
+			results[i] = info
+			return nil
+		})
+	}
+	_ = g.Wait()
+
+	if outputJSON {
+		clean := make([]*UserDetails, 0, len(results))
+		for _, r := range results {
+			if r != nil {
+				clean = append(clean, r)
+			}
+		}
+		enc := json.NewEncoder(w)
+		enc.SetIndent("", "  ")
+		if err := enc.Encode(clean); err != nil {
+			return err
+		}
+	} else {
+		for i, r := range results {
+			if r != nil {
+				r.renderText(w)
+			}
+			if errs[i] != nil {
+				fmt.Fprintf(w, "\n=== %s\nERROR: %v\n", usernames[i], errs[i])
+			}
+		}
+	}
+
+	return errors.Join(errs...)
+}