Improve doctor cli behavior (#28422)

1. Do not sort the "checks" slice again and again when "Register", it
just wastes CPU when the Gitea instance runs
2. If a check doesn't exist, tell the end user
3. Add some tests

2 files changed, 56 insertions, 28 deletions

diff --git a/cmd/doctor.go b/cmd/doctor.go
index d040a3af1c..4085d37332 100644
--- a/cmd/doctor.go
+++ b/cmd/doctor.go
@@ -14,6 +14,7 @@ import (
 	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/models/migrations"
 	migrate_base "code.gitea.io/gitea/models/migrations/base"
+	"code.gitea.io/gitea/modules/container"
 	"code.gitea.io/gitea/modules/doctor"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
@@ -22,6 +23,19 @@ import (
 	"xorm.io/xorm"
 )
 
+// CmdDoctor represents the available doctor sub-command.
+var CmdDoctor = &cli.Command{
+	Name:        "doctor",
+	Usage:       "Diagnose and optionally fix problems",
+	Description: "A command to diagnose problems with the current Gitea instance according to the given configuration. Some problems can optionally be fixed by modifying the database or data storage.",
+
+	Subcommands: []*cli.Command{
+		cmdDoctorCheck,
+		cmdRecreateTable,
+		cmdDoctorConvert,
+	},
+}
+
 var cmdDoctorCheck = &cli.Command{
 	Name:        "check",
 	Usage:       "Diagnose and optionally fix problems",
@@ -60,19 +74,6 @@ var cmdDoctorCheck = &cli.Command{
 	},
 }
 
-// CmdDoctor represents the available doctor sub-command.
-var CmdDoctor = &cli.Command{
-	Name:        "doctor",
-	Usage:       "Diagnose and optionally fix problems",
-	Description: "A command to diagnose problems with the current Gitea instance according to the given configuration. Some problems can optionally be fixed by modifying the database or data storage.",
-
-	Subcommands: []*cli.Command{
-		cmdDoctorCheck,
-		cmdRecreateTable,
-		cmdDoctorConvert,
-	},
-}
-
 var cmdRecreateTable = &cli.Command{
 	Name:      "recreate-table",
 	Usage:     "Recreate tables from XORM definitions and copy the data.",
@@ -177,6 +178,7 @@ func runDoctorCheck(ctx *cli.Context) error {
 	if ctx.IsSet("list") {
 		w := tabwriter.NewWriter(os.Stdout, 0, 8, 1, '\t', 0)
 		_, _ = w.Write([]byte("Default\tName\tTitle\n"))
+		doctor.SortChecks(doctor.Checks)
 		for _, check := range doctor.Checks {
 			if check.IsDefault {
 				_, _ = w.Write([]byte{'*'})
@@ -192,26 +194,20 @@ func runDoctorCheck(ctx *cli.Context) error {
 
 	var checks []*doctor.Check
 	if ctx.Bool("all") {
-		checks = doctor.Checks
+		checks = make([]*doctor.Check, len(doctor.Checks))
+		copy(checks, doctor.Checks)
 	} else if ctx.IsSet("run") {
 		addDefault := ctx.Bool("default")
-		names := ctx.StringSlice("run")
-		for i, name := range names {
-			names[i] = strings.ToLower(strings.TrimSpace(name))
-		}
-
+		runNamesSet := container.SetOf(ctx.StringSlice("run")...)
 		for _, check := range doctor.Checks {
-			if addDefault && check.IsDefault {
+			if (addDefault && check.IsDefault) || runNamesSet.Contains(check.Name) {
 				checks = append(checks, check)
-				continue
-			}
-			for _, name := range names {
-				if name == check.Name {
-					checks = append(checks, check)
-					break
-				}
+				runNamesSet.Remove(check.Name)
 			}
 		}
+		if len(runNamesSet) > 0 {
+			return fmt.Errorf("unknown checks: %q", strings.Join(runNamesSet.Values(), ","))
+		}
 	} else {
 		for _, check := range doctor.Checks {
 			if check.IsDefault {
@@ -219,6 +215,5 @@ func runDoctorCheck(ctx *cli.Context) error {
 			}
 		}
 	}
-
 	return doctor.RunChecks(stdCtx, colorize, ctx.Bool("fix"), checks)
 }
diff --git a/cmd/doctor_test.go b/cmd/doctor_test.go
new file mode 100644
index 0000000000..75376a567e
--- /dev/null
+++ b/cmd/doctor_test.go
@@ -0,0 +1,33 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package cmd
+
+import (
+	"context"
+	"testing"
+
+	"code.gitea.io/gitea/modules/doctor"
+	"code.gitea.io/gitea/modules/log"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/urfave/cli/v2"
+)
+
+func TestDoctorRun(t *testing.T) {
+	doctor.Register(&doctor.Check{
+		Title: "Test Check",
+		Name:  "test-check",
+		Run:   func(ctx context.Context, logger log.Logger, autofix bool) error { return nil },
+
+		SkipDatabaseInitialization: true,
+	})
+	app := cli.NewApp()
+	app.Commands = []*cli.Command{cmdDoctorCheck}
+	err := app.Run([]string{"./gitea", "check", "--run", "test-check"})
+	assert.NoError(t, err)
+	err = app.Run([]string{"./gitea", "check", "--run", "no-such"})
+	assert.ErrorContains(t, err, `unknown checks: "no-such"`)
+	err = app.Run([]string{"./gitea", "check", "--run", "test-check,no-such"})
+	assert.ErrorContains(t, err, `unknown checks: "no-such"`)
+}