Add more linters to improve code readability (#19989)

Add nakedret, unconvert, wastedassign, stylecheck and nolintlint linters to improve code readability

- nakedret - https://github.com/alexkohler/nakedret - nakedret is a Go static analysis tool to find naked returns in functions greater than a specified function length.
- unconvert - https://github.com/mdempsky/unconvert - Remove unnecessary type conversions
- wastedassign - https://github.com/sanposhiho/wastedassign -  wastedassign finds wasted assignment statements.
- notlintlint -  Reports ill-formed or insufficient nolint directives
- stylecheck - https://staticcheck.io/docs/checks/#ST - keep style consistent
  - excluded: [ST1003 - Poorly chosen identifier](https://staticcheck.io/docs/checks/#ST1003) and [ST1005 - Incorrectly formatted error string](https://staticcheck.io/docs/checks/#ST1005)

.golangci.yml

@@ -19,6 +19,11 @@ linters:
     - revive
     - gofumpt
     - depguard
+    - nakedret
+    - unconvert
+    - wastedassign
+    - nolintlint
+    - stylecheck
   enable-all: false
   disable-all: true
   fast: false
@@ -32,6 +37,10 @@ run:
     - web_src
 
 linters-settings:
+  stylecheck:
+    checks: ["all", "-ST1005", "-ST1003"]
+  nakedret:
+    max-func-lines: 0 
   gocritic:
     disabled-checks:
       - ifElseChain

cmd/hook.go

@@ -792,7 +792,7 @@ func writeDataPktLine(out io.Writer, data []byte) error {
 	if err != nil {
 		return fail("Internal Server Error", "Pkt-Line response failed: %v", err)
 	}
-	if 4 != lr {
+	if lr != 4 {
 		return fail("Internal Server Error", "Pkt-Line response failed: %v", err)
 	}
 

integrations/api_issue_stopwatch_test.go

@@ -38,7 +38,7 @@ func TestAPIListStopWatches(t *testing.T) {
 		assert.EqualValues(t, issue.Title, apiWatches[0].IssueTitle)
 		assert.EqualValues(t, repo.Name, apiWatches[0].RepoName)
 		assert.EqualValues(t, repo.OwnerName, apiWatches[0].RepoOwnerName)
-		assert.Greater(t, int64(apiWatches[0].Seconds), int64(0))
+		assert.Greater(t, apiWatches[0].Seconds, int64(0))
 	}
 }
 

integrations/api_packages_container_test.go

@@ -88,7 +88,7 @@ func TestPackageContainer(t *testing.T) {
 
 			req = NewRequest(t, "GET", fmt.Sprintf("%sv2", setting.AppURL))
 			addTokenAuthHeader(req, anonymousToken)
-			resp = MakeRequest(t, req, http.StatusOK)
+			MakeRequest(t, req, http.StatusOK)
 		})
 
 		t.Run("User", func(t *testing.T) {
@@ -112,7 +112,7 @@ func TestPackageContainer(t *testing.T) {
 
 			req = NewRequest(t, "GET", fmt.Sprintf("%sv2", setting.AppURL))
 			addTokenAuthHeader(req, userToken)
-			resp = MakeRequest(t, req, http.StatusOK)
+			MakeRequest(t, req, http.StatusOK)
 		})
 	})
 

integrations/editor_test.go

@@ -82,7 +82,7 @@ func TestCreateFileOnProtectedBranch(t *testing.T) {
 			"_csrf":     csrf,
 			"protected": "off",
 		})
-		resp = session.MakeRequest(t, req, http.StatusSeeOther)
+		session.MakeRequest(t, req, http.StatusSeeOther)
 		// Check if master branch has been locked successfully
 		flashCookie = session.GetCookie("macaron_flash")
 		assert.NotNil(t, flashCookie)
@@ -109,7 +109,7 @@ func testEditFile(t *testing.T, session *TestSession, user, repo, branch, filePa
 			"commit_choice": "direct",
 		},
 	)
-	resp = session.MakeRequest(t, req, http.StatusSeeOther)
+	session.MakeRequest(t, req, http.StatusSeeOther)
 
 	// Verify the change
 	req = NewRequest(t, "GET", path.Join(user, repo, "raw/branch", branch, filePath))
@@ -139,7 +139,7 @@ func testEditFileToNewBranch(t *testing.T, session *TestSession, user, repo, bra
 			"new_branch_name": targetBranch,
 		},
 	)
-	resp = session.MakeRequest(t, req, http.StatusSeeOther)
+	session.MakeRequest(t, req, http.StatusSeeOther)
 
 	// Verify the change
 	req = NewRequest(t, "GET", path.Join(user, repo, "raw/branch", targetBranch, filePath))

integrations/git_test.go

@@ -150,7 +150,7 @@ func standardCommitAndPushTest(t *testing.T, dstPath string) (little, big string
 		defer PrintCurrentTest(t)()
 		little, big = commitAndPushTest(t, dstPath, "data-file-")
 	})
-	return
+	return little, big
 }
 
 func lfsCommitAndPushTest(t *testing.T, dstPath string) (littleLFS, bigLFS string) {
@@ -191,7 +191,7 @@ func lfsCommitAndPushTest(t *testing.T, dstPath string) (littleLFS, bigLFS strin
 			lockTest(t, dstPath)
 		})
 	})
-	return
+	return littleLFS, bigLFS
 }
 
 func commitAndPushTest(t *testing.T, dstPath, prefix string) (little, big string) {
@@ -210,7 +210,7 @@ func commitAndPushTest(t *testing.T, dstPath, prefix string) (little, big string
 			big = doCommitAndPush(t, bigSize, dstPath, prefix)
 		})
 	})
-	return
+	return little, big
 }
 
 func rawTest(t *testing.T, ctx *APITestContext, little, big, littleLFS, bigLFS string) {

integrations/integration_test.go

@@ -438,7 +438,7 @@ func getTokenForLoggedInUser(t testing.TB, session *TestSession) string {
 		"_csrf": doc.GetCSRF(),
 		"name":  fmt.Sprintf("api-testing-token-%d", tokenCounter),
 	})
-	resp = session.MakeRequest(t, req, http.StatusSeeOther)
+	session.MakeRequest(t, req, http.StatusSeeOther)
 	req = NewRequest(t, "GET", "/user/settings/applications")
 	resp = session.MakeRequest(t, req, http.StatusOK)
 	htmlDoc := NewHTMLParser(t, resp.Body)

integrations/nonascii_branches_test.go

@@ -26,7 +26,7 @@ func testSrcRouteRedirect(t *testing.T, session *TestSession, user, repo, route,
 
 	// Perform redirect
 	req = NewRequest(t, "GET", location)
-	resp = session.MakeRequest(t, req, expectedStatus)
+	session.MakeRequest(t, req, expectedStatus)
 }
 
 func setDefaultBranch(t *testing.T, session *TestSession, user, repo, branch string) {

integrations/oauth_test.go

@@ -197,7 +197,7 @@ func TestAccessTokenExchangeWithBasicAuth(t *testing.T) {
 		"code_verifier": "N1Zo9-8Rfwhkt68r1r29ty8YwIraXR8eh_1Qwxg7yQXsonBt", // test PKCE additionally
 	})
 	req.Header.Add("Authorization", "Basic ZGE3ZGEzYmEtOWExMy00MTY3LTg1NmYtMzg5OWRlMGIwMTM4OmJsYWJsYQ==")
-	resp = MakeRequest(t, req, http.StatusBadRequest)
+	MakeRequest(t, req, http.StatusBadRequest)
 
 	// missing header
 	req = NewRequestWithValues(t, "POST", "/login/oauth/access_token", map[string]string{
@@ -206,7 +206,7 @@ func TestAccessTokenExchangeWithBasicAuth(t *testing.T) {
 		"code":          "authcode",
 		"code_verifier": "N1Zo9-8Rfwhkt68r1r29ty8YwIraXR8eh_1Qwxg7yQXsonBt", // test PKCE additionally
 	})
-	resp = MakeRequest(t, req, http.StatusBadRequest)
+	MakeRequest(t, req, http.StatusBadRequest)
 }
 
 func TestRefreshTokenInvalidation(t *testing.T) {

integrations/repo_fork_test.go

@@ -45,7 +45,7 @@ func testRepoFork(t *testing.T, session *TestSession, ownerName, repoName, forkO
 		"uid":       fmt.Sprintf("%d", forkOwner.ID),
 		"repo_name": forkRepoName,
 	})
-	resp = session.MakeRequest(t, req, http.StatusSeeOther)
+	session.MakeRequest(t, req, http.StatusSeeOther)
 
 	// Step4: check the existence of the forked repo
 	req = NewRequestf(t, "GET", "/%s/%s", forkOwnerName, forkRepoName)

integrations/repo_generate_test.go

@@ -46,7 +46,7 @@ func testRepoGenerate(t *testing.T, session *TestSession, templateOwnerName, tem
 		"repo_name":   generateRepoName,
 		"git_content": "true",
 	})
-	resp = session.MakeRequest(t, req, http.StatusSeeOther)
+	session.MakeRequest(t, req, http.StatusSeeOther)
 
 	// Step4: check the existence of the generated repo
 	req = NewRequestf(t, "GET", "/%s/%s", generateOwnerName, generateRepoName)

integrations/user_test.go

@@ -245,6 +245,6 @@ func TestListStopWatches(t *testing.T) {
 		assert.EqualValues(t, issue.Title, apiWatches[0].IssueTitle)
 		assert.EqualValues(t, repo.Name, apiWatches[0].RepoName)
 		assert.EqualValues(t, repo.OwnerName, apiWatches[0].RepoOwnerName)
-		assert.Greater(t, int64(apiWatches[0].Seconds), int64(0))
+		assert.Greater(t, apiWatches[0].Seconds, int64(0))
 	}
 }

models/action.go

@@ -459,7 +459,7 @@ func DeleteOldActions(olderThan time.Duration) (err error) {
 	}
 
 	_, err = db.GetEngine(db.DefaultContext).Where("created_unix < ?", time.Now().Add(-olderThan).Unix()).Delete(&Action{})
-	return
+	return err
 }
 
 func notifyWatchers(ctx context.Context, actions ...*Action) error {

models/admin/notice.go

@@ -142,5 +142,5 @@ func DeleteOldSystemNotices(olderThan time.Duration) (err error) {
 	}
 
 	_, err = db.GetEngine(db.DefaultContext).Where("created_unix < ?", time.Now().Add(-olderThan).Unix()).Delete(&Notice{})
-	return
+	return err
 }

models/asymkey/gpg_key_commit_verification.go

@@ -520,5 +520,5 @@ func CalculateTrustStatus(verification *CommitVerification, repoTrustModel repo_
 		}
 	}
 
-	return
+	return err
 }

models/asymkey/ssh_key_test.go

@@ -317,7 +317,7 @@ func TestFromOpenSSH(t *testing.T) {
 			td := t.TempDir()
 
 			data := []byte("hello, ssh world")
-			dataPath := write(t, []byte(data), td, "data")
+			dataPath := write(t, data, td, "data")
 
 			privPath := write(t, []byte(tt.priv), td, "id")
 			write(t, []byte(tt.pub), td, "id.pub")
@@ -372,14 +372,14 @@ func TestToOpenSSH(t *testing.T) {
 			td := t.TempDir()
 
 			data := []byte("hello, ssh world")
-			write(t, []byte(data), td, "data")
+			write(t, data, td, "data")
 
 			armored, err := sshsig.Sign([]byte(tt.priv), bytes.NewReader(data), "file")
 			if err != nil {
 				t.Fatal(err)
 			}
 
-			sigPath := write(t, []byte(armored), td, "oursig")
+			sigPath := write(t, armored, td, "oursig")
 
 			// Create an allowed_signers file with two keys to check against.
 			allowedSigner := "test@rekor.dev " + tt.pub + "\n"

models/auth/oauth2.go

@@ -123,7 +123,7 @@ func GetOAuth2ApplicationByClientID(ctx context.Context, clientID string) (app *
 	if !has {
 		return nil, ErrOAuthClientIDInvalid{ClientID: clientID}
 	}
-	return
+	return app, err
 }
 
 // GetOAuth2ApplicationByID returns the oauth2 application with the given id. Returns an error if not found.
@@ -143,7 +143,7 @@ func GetOAuth2ApplicationByID(ctx context.Context, id int64) (app *OAuth2Applica
 func GetOAuth2ApplicationsByUserID(ctx context.Context, userID int64) (apps []*OAuth2Application, err error) {
 	apps = make([]*OAuth2Application, 0)
 	err = db.GetEngine(ctx).Where("uid = ?", userID).Find(&apps)
-	return
+	return apps, err
 }
 
 // CreateOAuth2ApplicationOptions holds options to create an oauth2 application
@@ -300,7 +300,7 @@ func (code *OAuth2AuthorizationCode) GenerateRedirectURI(state string) (redirect
 	}
 	q.Set("code", code.Code)
 	redirect.RawQuery = q.Encode()
-	return
+	return redirect, err
 }
 
 // Invalidate deletes the auth code from the database to invalidate this code
@@ -430,7 +430,7 @@ func GetOAuth2GrantByID(ctx context.Context, id int64) (grant *OAuth2Grant, err
 	} else if !has {
 		return nil, nil
 	}
-	return
+	return grant, err
 }
 
 // GetOAuth2GrantsByUserID lists all grants of a certain user

models/db/engine.go

@@ -285,5 +285,5 @@ func DeleteAllRecords(tableName string) error {
 // GetMaxID will return max id of the table
 func GetMaxID(beanOrTableName interface{}) (maxID int64, err error) {
 	_, err = x.Select("MAX(id)").Table(beanOrTableName).Get(&maxID)
-	return
+	return maxID, err
 }

models/db/index.go

@@ -44,7 +44,7 @@ func UpsertResourceIndex(ctx context.Context, tableName string, groupID int64) (
 	default:
 		return fmt.Errorf("database type not supported")
 	}
-	return
+	return err
 }
 
 var (

models/db/list_options.go

@@ -58,7 +58,7 @@ func (opts *ListOptions) GetSkipTake() (skip, take int) {
 func (opts *ListOptions) GetStartEnd() (start, end int) {
 	start, take := opts.GetSkipTake()
 	end = start + take
-	return
+	return start, end
 }
 
 // SetDefaultValues sets default values

models/db/sql_postgres_with_schema.go

@@ -44,7 +44,7 @@ func (d *postgresSchemaDriver) Open(name string) (driver.Conn, error) {
 		_, err := execer.Exec(`SELECT set_config(
 			'search_path',
 			$1 || ',' || current_setting('search_path'),
-			false)`, []driver.Value{schemaValue}) //nolint
+			false)`, []driver.Value{schemaValue})
 		if err != nil {
 			_ = conn.Close()
 			return nil, err

models/git/branches.go

@@ -363,7 +363,7 @@ func updateApprovalWhitelist(ctx context.Context, repo *repo_model.Repository, c
 		whitelist = append(whitelist, userID)
 	}
 
-	return
+	return whitelist, err
 }
 
 // updateUserWhitelist checks whether the user whitelist changed and returns a whitelist with
@@ -392,7 +392,7 @@ func updateUserWhitelist(ctx context.Context, repo *repo_model.Repository, curre
 		whitelist = append(whitelist, userID)
 	}
 
-	return
+	return whitelist, err
 }
 
 // updateTeamWhitelist checks whether the team whitelist changed and returns a whitelist with
@@ -415,7 +415,7 @@ func updateTeamWhitelist(ctx context.Context, repo *repo_model.Repository, curre
 		}
 	}
 
-	return
+	return whitelist, err
 }
 
 // DeleteProtectedBranch removes ProtectedBranch relation between the user and repository.
@@ -539,7 +539,7 @@ func FindRenamedBranch(repoID int64, from string) (branch *RenamedBranch, exist
 	}
 	exist, err = db.GetEngine(db.DefaultContext).Get(branch)
 
-	return
+	return branch, exist, err
 }
 
 // RenameBranch rename a branch

models/git/commit_status.go

@@ -74,7 +74,7 @@ func upsertCommitStatusIndex(ctx context.Context, repoID int64, sha string) (err
 	default:
 		return fmt.Errorf("database type not supported")
 	}
-	return
+	return err
 }
 
 // GetNextCommitStatusIndex retried 3 times to generate a resource index

models/issues/assignees.go

@@ -42,7 +42,7 @@ func (issue *Issue) LoadAssignees(ctx context.Context) (err error) {
 	if len(issue.Assignees) > 0 {
 		issue.Assignee = issue.Assignees[0]
 	}
-	return
+	return err
 }
 
 // GetAssigneeIDsByIssue returns the IDs of users assigned to an issue
@@ -167,5 +167,5 @@ func MakeIDsFromAPIAssigneesToAdd(oneAssignee string, multipleAssignees []string
 	// Get the IDs of all assignees
 	assigneeIDs, err = user_model.GetUserIDsByNames(requestAssignees, false)
 
-	return
+	return assigneeIDs, err
 }