[githubgen] PR feedback follow-ups

.chloggen/githubgen-enhancements.yaml

@@ -0,0 +1,16 @@
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: 'enhancement'
+
+# The name of the component, or a single word describing the area of concern, (e.g. crosslink)
+component: githubgen
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Enhanced githubgen tool with more options to better fit arbitrary repos, added unit tests
+
+# One or more tracking issues related to the change
+issues: [655]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:

githubgen/README.md

@@ -17,7 +17,10 @@ $> ./githubgen
 The equivalent of:
 
 ```shell
-$> GITHUB_TOKEN=<mypattoken> githubgen --folder . [--allowlist cmd/githubgen/allowlist.txt] 
+$> githubgen --skipgithub --folder . --github-org "open-telemetry" \
+  --pretty-repo-name "OpenTelemetry Collector Contrib" \
+  --default-codeowner open-telemetry/opentelemetry-collector-approvers \
+  --allowlist cmd/githubgen/allowlist.txt
 ```
 
 ## Checking codeowners against OpenTelemetry membership via GitHub API
@@ -26,12 +29,17 @@ To authenticate, set the environment variable `GITHUB_TOKEN` to a PAT token.
 If a PAT is not available you can use the `--skipgithub` flag to avoid checking
 for membership in the GitHub organization.
 
+Additionally, the GitHub organization name needs to be specified using
+`--github-org <your-org>`, along with `--pretty-repo-name` to be filled
+into CODEOWNERS files (e.g. "OpenTelemetry Collector Contrib")
+and `--default-codeowner` to be used as the default owner for general files.
+
 For each codeowner, the script will check if the user is registered as a member
 of the OpenTelemetry organization.
 
 If any codeowner is missing, it will stop and print names of missing codeowners.
 
 These can be added to allowlist.txt as a workaround.
 
-If a codeowner is present in allowlist.txt and also a member of the
+If a codeowner is present in `allowlist.txt` and also a member of the
 OpenTelemetry organization, the script will error out.

githubgen/codeowners.go

@@ -7,6 +7,7 @@
 	"fmt"
 	"os"
 	"path/filepath"
+	"slices"
 	"sort"
 	"strings"
 
@@ -15,133 +16,36 @@
 	"go.opentelemetry.io/build-tools/githubgen/datatype"
 )
 
-const allowlistHeader = `# Code generated by githubgen. DO NOT EDIT.
-#####################################################
-#
-# List of components in OpenTelemetry Collector Contrib
-# waiting on owners to be assigned
-#
-#####################################################
-#
-# Learn about membership in OpenTelemetry community:
-#  https://github.com/open-telemetry/community/blob/main/guides/contributor/membership.md
-#
-#
-# Learn about CODEOWNERS file format:
-#  https://help.github.com/en/articles/about-code-owners
-#
-
-## 
-# NOTE: New components MUST have one or more codeowners. Add codeowners to the component metadata.yaml and run make gengithub
-##
-
-## COMMON & SHARED components
-internal/common
-
-`
-
-const unmaintainedHeader = `
-
-## UNMAINTAINED components
-
-`
-
-const codeownersHeader = `# Code generated by githubgen. DO NOT EDIT.
-#####################################################
-#
-# List of codeowners for OpenTelemetry Collector Contrib
-#
-#####################################################
-#
-# Learn about membership in OpenTelemetry community:
-# https://github.com/open-telemetry/community/blob/main/guides/contributor/membership.md
-#
-#
-# Learn about CODEOWNERS file format:
-# https://help.github.com/en/articles/about-code-owners
-#
-
-* @open-telemetry/collector-contrib-approvers
-`
-
-const distributionCodeownersHeader = `
-#####################################################
-#
-# List of distribution maintainers for OpenTelemetry Collector Contrib
-#
-#####################################################
-`
-
 type codeownersGenerator struct {
-	skipGithub bool
+	skipGithub       bool
+	getGitHubMembers func(skipGithub bool, githubOrg string) (map[string]struct{}, error)
 }
 
 func (cg *codeownersGenerator) Generate(data datatype.GithubData) error {
 	allowlistData, err := os.ReadFile(data.AllowlistFilePath)
 	if err != nil {
 		return err
 	}
-	allowlistLines := strings.Split(string(allowlistData), "\n")
 
-	allowlist := make(map[string]struct{}, len(allowlistLines))
-	unusedAllowlist := make(map[string]struct{}, len(allowlistLines))
-	for _, line := range allowlistLines {
-		if line == "" {
-			continue
-		}
-		allowlist[line] = struct{}{}
-		unusedAllowlist[line] = struct{}{}
-	}
-	var missingCodeowners []string
-	var duplicateCodeowners []string
-	members, err := cg.getGithubMembers()
+	err = cg.verifyCodeOwnerOrgMembership(allowlistData, data)
 	if err != nil {
 		return err
 	}
-	for _, codeowner := range data.Codeowners {
-		_, present := members[codeowner]
 
-		if !present {
-			_, allowed := allowlist[codeowner]
-			delete(unusedAllowlist, codeowner)
-			allowed = allowed || strings.HasPrefix(codeowner, "open-telemetry/")
-			if !allowed {
-				missingCodeowners = append(missingCodeowners, codeowner)
-			}
-		} else if _, ok := allowlist[codeowner]; ok {
-			duplicateCodeowners = append(duplicateCodeowners, codeowner)
-		}
-	}
-	if len(missingCodeowners) > 0 && !cg.skipGithub {
-		sort.Strings(missingCodeowners)
-		return fmt.Errorf("codeowners are not members: %s", strings.Join(missingCodeowners, ", "))
-	}
-	if len(duplicateCodeowners) > 0 {
-		sort.Strings(duplicateCodeowners)
-		return fmt.Errorf("codeowners members duplicate in allowlist: %s", strings.Join(duplicateCodeowners, ", "))
-	}
-	if len(unusedAllowlist) > 0 {
-		var unused []string
-		for k := range unusedAllowlist {
-			unused = append(unused, k)
-		}
-		sort.Strings(unused)
-		return fmt.Errorf("unused members in allowlist: %s", strings.Join(unused, ", "))
-	}
-
-	codeowners := codeownersHeader
-	deprecatedList := "## DEPRECATED components\n"
-	unmaintainedList := "\n## UNMAINTAINED components\n"
+	codeowners := fmt.Sprintf(codeownersHeader, data.RepoName, data.DefaultCodeOwner)
+	deprecatedList := deprecatedListHeader
+	unmaintainedList := unmaintainedListHeader
 
 	unmaintainedCodeowners := unmaintainedHeader
 	currentFirstSegment := ""
+
 LOOP:
 	for _, key := range data.Folders {
 		m := data.Components[key]
 		for stability := range m.Status.Stability {
 			if stability == unmaintainedStatus {
 				unmaintainedList += key + "/\n"
-				unmaintainedCodeowners += fmt.Sprintf("%s/%s @open-telemetry/collector-contrib-approvers \n", key, strings.Repeat(" ", data.MaxLength-len(key)))
+				unmaintainedCodeowners += fmt.Sprintf("%s/%s %s \n", key, strings.Repeat(" ", data.MaxLength-len(key)), data.DefaultCodeOwner)
 				continue LOOP
 			}
 			if stability == "deprecated" && (m.Status.Codeowners == nil || len(m.Status.Codeowners.Active) == 0) {
@@ -161,11 +65,11 @@
 				owners += " "
 				owners += "@" + owner
 			}
-			codeowners += fmt.Sprintf("%s/%s @open-telemetry/collector-contrib-approvers%s\n", key, strings.Repeat(" ", data.MaxLength-len(key)), owners)
+			codeowners += fmt.Sprintf("%s/%s %s%s\n", key, strings.Repeat(" ", data.MaxLength-len(key)), data.DefaultCodeOwner, owners)
 		}
 	}
 
-	codeowners += distributionCodeownersHeader
+	codeowners += fmt.Sprintf(distributionCodeownersHeader, data.RepoName)
 	longestName := 0
 	for _, dist := range data.Distributions {
 		if longestName < len(dist.Name) {
@@ -178,34 +82,94 @@
 		for _, m := range dist.Maintainers {
 			maintainers = append(maintainers, fmt.Sprintf("@%s", m))
 		}
-		codeowners += fmt.Sprintf("reports/distributions/%s.yaml%s @open-telemetry/collector-contrib-approvers %s\n", dist.Name, strings.Repeat(" ", longestName-len(dist.Name)), strings.Join(maintainers, " "))
+		codeowners += fmt.Sprintf("reports/distributions/%s.yaml%s %s %s\n", dist.Name, strings.Repeat(" ", longestName-len(dist.Name)), data.DefaultCodeOwner, strings.Join(maintainers, " "))
 	}
 
 	err = os.WriteFile(filepath.Join(".github", "CODEOWNERS"), []byte(codeowners+unmaintainedCodeowners), 0o600)
 	if err != nil {
 		return err
 	}
-	err = os.WriteFile(filepath.Join(".github", "ALLOWLIST"), []byte(allowlistHeader+deprecatedList+unmaintainedList), 0o600)
+	err = os.WriteFile(filepath.Join(".github", "ALLOWLIST"), []byte(fmt.Sprintf(allowlistHeader, data.RepoName)+deprecatedList+unmaintainedList), 0o600)
 	if err != nil {
 		return err
 	}
 	return nil
 }
 
-func (cg *codeownersGenerator) getGithubMembers() (map[string]struct{}, error) {
-	if cg.skipGithub {
+// verifyCodeOwnerOrgMembership verifies that all codeOwners are members of the defined GitHub organization
+//
+// If a codeOwner is not part of the GitHub org, that user will be looked for in the allowlist.
+//
+// The method returns an error if:
+// - there are code owners that are not org members and not in the allowlist (only if skipGithub is set to false)
+// - there are redundant entries in the allowlist
+// - there are entries in the allowlist that are unused
+func (cg *codeownersGenerator) verifyCodeOwnerOrgMembership(allowlistData []byte, data datatype.GithubData) error {
+	allowlist := strings.Split(string(allowlistData), "\n")
+	allowlist = slices.DeleteFunc(allowlist, func(s string) bool {
+		return s == ""
+	})
+	unusedAllowlist := append([]string{}, allowlist...)
+
+	var missingCodeowners []string
+	var duplicateCodeowners []string
+
+	members, err := cg.getGitHubMembers(cg.skipGithub, data.GitHubOrg)
+	if err != nil {
+		return err
+	}
+
+	// sort codeowners
+	for _, codeowner := range data.Codeowners {
+		_, ownerPresentInMembers := members[codeowner]
+
+		if !ownerPresentInMembers {
+			ownerInAllowlist := slices.Contains(allowlist, codeowner)
+			unusedAllowlist = slices.DeleteFunc(unusedAllowlist, func(s string) bool {
+				return s == codeowner
+			})
+
+			ownerInAllowlist = ownerInAllowlist || strings.HasPrefix(codeowner, "open-telemetry/")
+
+			if !ownerInAllowlist {
+				missingCodeowners = append(missingCodeowners, codeowner)
+			}
+		} else if slices.Contains(allowlist, codeowner) {
+			duplicateCodeowners = append(duplicateCodeowners, codeowner)
+		}
+	}
+
+	// error cases
+	if len(missingCodeowners) > 0 && !cg.skipGithub {
+		sort.Strings(missingCodeowners)
+		return fmt.Errorf("codeowners are not members: %s", strings.Join(missingCodeowners, ", "))
+	}
+	if len(duplicateCodeowners) > 0 {
+		sort.Strings(duplicateCodeowners)
+		return fmt.Errorf("codeowners members duplicate in allowlist: %s", strings.Join(duplicateCodeowners, ", "))
+	}
+	if len(unusedAllowlist) > 0 {
+		unused := append([]string{}, unusedAllowlist...)
+		sort.Strings(unused)
+		return fmt.Errorf("unused members in allowlist: %s", strings.Join(unused, ", "))
+	}
+	return err
+}
+
+func GetGithubMembers(skipGithub bool, githubOrg string) (map[string]struct{}, error) {
+	if skipGithub {
 		// don't try to get organization members if no token is expected
 		return map[string]struct{}{}, nil
 	}
 	githubToken := os.Getenv("GITHUB_TOKEN")
 	if githubToken == "" {
 		return nil, fmt.Errorf("Set the environment variable `GITHUB_TOKEN` to a PAT token to authenticate")
 	}
-	client := github.NewTokenClient(context.Background(), githubToken)
+	client := github.NewClient(nil).WithAuthToken(githubToken)
 	var allUsers []*github.User
 	pageIndex := 0
 	for {
-		users, resp, err := client.Organizations.ListMembers(context.Background(), "open-telemetry",
+		users, resp, err := client.Organizations.ListMembers(context.Background(), githubOrg,
 			&github.ListMembersOptions{
 				PublicOnly: false,
 				ListOptions: github.ListOptions{