Allow skipping forks and mirrors from being indexed (#23187)

This PR adds two new options to disable repo/code search indexing of
both forks and mirrors.

Related: #22842

custom/conf/app.example.ini

@@ -1362,6 +1362,10 @@ LEVEL = Info
 ;; repo indexer by default disabled, since it uses a lot of disk space
 ;REPO_INDEXER_ENABLED = false
 ;;
+;; repo indexer units, the items to index, could be `sources`, `forks`, `mirrors`, `templates` or any combination of them separated by a comma.
+;; If empty then it defaults to `sources` only, as if you'd like to disable fully please see REPO_INDEXER_ENABLED.
+;REPO_INDEXER_REPO_TYPES = sources,forks,mirrors,templates
+;;
 ;; Code search engine type, could be `bleve` or `elasticsearch`.
 ;REPO_INDEXER_TYPE = bleve
 ;;

docs/content/doc/administration/config-cheat-sheet.en-us.md

@@ -465,6 +465,7 @@ relation to port exhaustion.
 - `ISSUE_INDEXER_PATH`: **indexers/issues.bleve**: Index file used for issue search; available when ISSUE_INDEXER_TYPE is bleve and elasticsearch. Relative paths will be made absolute against _`AppWorkPath`_.
 
 - `REPO_INDEXER_ENABLED`: **false**: Enables code search (uses a lot of disk space, about 6 times more than the repository size).
+- `REPO_INDEXER_REPO_TYPES`: **sources,forks,mirrors,templates**: Repo indexer units. The items to index could be `sources`, `forks`, `mirrors`, `templates` or any combination of them separated by a comma. If empty then it defaults to `sources` only, as if you'd like to disable fully please see `REPO_INDEXER_ENABLED`.
 - `REPO_INDEXER_TYPE`: **bleve**: Code search engine type, could be `bleve` or `elasticsearch`.
 - `REPO_INDEXER_PATH`: **indexers/repos.bleve**: Index file used for code search.
 - `REPO_INDEXER_CONN_STR`: ****: Code indexer connection string, available when `REPO_INDEXER_TYPE` is elasticsearch. i.e. http://elastic:changeme@localhost:9200

modules/indexer/code/indexer.go

@@ -19,6 +19,7 @@ import (
 	"code.gitea.io/gitea/modules/queue"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/timeutil"
+	"code.gitea.io/gitea/modules/util"
 )
 
 // SearchResult result of performing a search in a repo
@@ -91,6 +92,32 @@ func index(ctx context.Context, indexer Indexer, repoID int64) error {
 		return err
 	}
 
+	repoTypes := setting.Indexer.RepoIndexerRepoTypes
+
+	if len(repoTypes) == 0 {
+		repoTypes = []string{"sources"}
+	}
+
+	// skip forks from being indexed if unit is not present
+	if !util.SliceContains(repoTypes, "forks") && repo.IsFork {
+		return nil
+	}
+
+	// skip mirrors from being indexed if unit is not present
+	if !util.SliceContains(repoTypes, "mirrors") && repo.IsMirror {
+		return nil
+	}
+
+	// skip templates from being indexed if unit is not present
+	if !util.SliceContains(repoTypes, "templates") && repo.IsTemplate {
+		return nil
+	}
+
+	// skip regular repos from being indexed if unit is not present
+	if !util.SliceContains(repoTypes, "sources") && !repo.IsFork && !repo.IsMirror && !repo.IsTemplate {
+		return nil
+	}
+
 	sha, err := getDefaultBranchSha(ctx, repo)
 	if err != nil {
 		return err

modules/setting/indexer.go

@@ -24,6 +24,7 @@ var Indexer = struct {
 	StartupTimeout   time.Duration
 
 	RepoIndexerEnabled   bool
+	RepoIndexerRepoTypes []string
 	RepoType             string
 	RepoPath             string
 	RepoConnStr          string
@@ -40,6 +41,7 @@ var Indexer = struct {
 	IssueIndexerName: "gitea_issues",
 
 	RepoIndexerEnabled:   false,
+	RepoIndexerRepoTypes: []string{"sources", "forks", "mirrors", "templates"},
 	RepoType:             "bleve",
 	RepoPath:             "indexers/repos.bleve",
 	RepoConnStr:          "",
@@ -71,6 +73,7 @@ func loadIndexerFrom(rootCfg ConfigProvider) {
 	Indexer.IssueIndexerName = sec.Key("ISSUE_INDEXER_NAME").MustString(Indexer.IssueIndexerName)
 
 	Indexer.RepoIndexerEnabled = sec.Key("REPO_INDEXER_ENABLED").MustBool(false)
+	Indexer.RepoIndexerRepoTypes = strings.Split(sec.Key("REPO_INDEXER_REPO_TYPES").MustString("sources,forks,mirrors,templates"), ",")
 	Indexer.RepoType = sec.Key("REPO_INDEXER_TYPE").MustString("bleve")
 	Indexer.RepoPath = filepath.ToSlash(sec.Key("REPO_INDEXER_PATH").MustString(filepath.ToSlash(filepath.Join(AppDataPath, "indexers/repos.bleve"))))
 	if !filepath.IsAbs(Indexer.RepoPath) {