From 70e4134130331bda3bb1873c6099d8e63c468a2d Mon Sep 17 00:00:00 2001
From: 6543 <6543@obermui.de>
Date: Fri, 19 Mar 2021 22:13:39 +0100
Subject: [PATCH] Delete Labels & IssueLabels on Repo Delete too (#15039)
 (#15051)

* Doctor: find IssueLabels without existing label

* Repo Delete: delete labels & issue_labels too
---
 cmd/doctor.go         | 16 ++++++++++++++++
 models/consistency.go | 18 ++++++++++++++++++
 models/issue_label.go | 12 ++++++++++++
 models/repo.go        |  4 ++++
 4 files changed, 50 insertions(+)

diff --git a/cmd/doctor.go b/cmd/doctor.go
index 5ba0451110..3c271f131f 100644
--- a/cmd/doctor.go
+++ b/cmd/doctor.go
@@ -606,6 +606,22 @@ func runDoctorCheckDBConsistency(ctx *cli.Context) ([]string, error) {
 		}
 	}
 
+	// find IssueLabels without existing label
+	count, err = models.CountOrphanedIssueLabels()
+	if err != nil {
+		return nil, err
+	}
+	if count > 0 {
+		if ctx.Bool("fix") {
+			if err = models.DeleteOrphanedIssueLabels(); err != nil {
+				return nil, err
+			}
+			results = append(results, fmt.Sprintf("%d issue_labels without existing label deleted", count))
+		} else {
+			results = append(results, fmt.Sprintf("%d issue_labels without existing label", count))
+		}
+	}
+
 	//find issues without existing repository
 	count, err = models.CountOrphanedIssues()
 	if err != nil {
diff --git a/models/consistency.go b/models/consistency.go
index 0c62d4dc24..3a5c4cae50 100644
--- a/models/consistency.go
+++ b/models/consistency.go
@@ -224,6 +224,24 @@ func DeleteOrphanedLabels() error {
 	return nil
 }
 
+// CountOrphanedIssueLabels return count of IssueLabels witch have no label behind anymore
+func CountOrphanedIssueLabels() (int64, error) {
+	return x.Table("issue_label").
+		Join("LEFT", "label", "issue_label.label_id = label.id").
+		Where(builder.IsNull{"label.id"}).Count()
+}
+
+// DeleteOrphanedIssueLabels delete IssueLabels witch have no label behind anymore
+func DeleteOrphanedIssueLabels() error {
+
+	_, err := x.In("id", builder.Select("issue_label.id").From("issue_label").
+		Join("LEFT", "label", "issue_label.label_id = label.id").
+		Where(builder.IsNull{"label.id"})).
+		Delete(IssueLabel{})
+
+	return err
+}
+
 // CountOrphanedIssues count issues without a repo
 func CountOrphanedIssues() (int64, error) {
 	return x.Table("issue").
diff --git a/models/issue_label.go b/models/issue_label.go
index 54b286fe7e..6d519aa8cd 100644
--- a/models/issue_label.go
+++ b/models/issue_label.go
@@ -764,3 +764,15 @@ func DeleteIssueLabel(issue *Issue, label *Label, doer *User) (err error) {
 
 	return sess.Commit()
 }
+
+func deleteLabelsByRepoID(sess Engine, repoID int64) error {
+	deleteCond := builder.Select("id").From("label").Where(builder.Eq{"label.repo_id": repoID})
+
+	if _, err := sess.In("label_id", deleteCond).
+		Delete(&IssueLabel{}); err != nil {
+		return err
+	}
+
+	_, err := sess.Delete(&Label{RepoID: repoID})
+	return err
+}
diff --git a/models/repo.go b/models/repo.go
index 8c6d8b9ee3..6d6f61597b 100644
--- a/models/repo.go
+++ b/models/repo.go
@@ -1729,6 +1729,10 @@ func DeleteRepository(doer *User, uid, repoID int64) error {
 		return fmt.Errorf("deleteBeans: %v", err)
 	}
 
+	if err := deleteLabelsByRepoID(sess, repoID); err != nil {
+		return err
+	}
+
 	// Delete Issues and related objects
 	var attachmentPaths []string
 	if attachmentPaths, err = deleteIssuesByRepoID(sess, repoID); err != nil {