func Install(ctx *middleware.Context) {
	form := auth.InstallForm{}

	// Database settings
	form.DbHost = models.DbCfg.Host
	form.DbUser = models.DbCfg.User
	form.DbName = models.DbCfg.Name
	form.DbPath = models.DbCfg.Path
	form.DbURI = models.DbCfg.URI

	ctx.Data["CurDbOption"] = "MySQL"
	switch models.DbCfg.Type {
	case "postgres":
		ctx.Data["CurDbOption"] = "PostgreSQL"
	case "sqlite3":
		if models.EnableSQLite3 {
			ctx.Data["CurDbOption"] = "SQLite3"
		}
	case "tidb":
		if models.EnableTidb {
			ctx.Data["CurDbOption"] = "TiDB"
		}
	}

	// Application general settings
	form.AppName = setting.AppName
	form.RepoRootPath = setting.RepoRootPath

	// Note(unknwon): it's hard for Windows users change a running user,
	// 	so just use current one if config says default.
	if setting.IsWindows && setting.RunUser == "git" {
		form.RunUser = user.CurrentUsername()
	} else {
		form.RunUser = setting.RunUser
	}

	form.Domain = setting.Domain
	form.SSHPort = setting.SSHPort
	form.HTTPPort = setting.HttpPort
	form.AppUrl = setting.AppUrl

	// E-mail service settings
	if setting.MailService != nil {
		form.SMTPHost = setting.MailService.Host
		form.SMTPFrom = setting.MailService.From
		form.SMTPEmail = setting.MailService.User
	}
	form.RegisterConfirm = setting.Service.RegisterEmailConfirm
	form.MailNotify = setting.Service.EnableNotifyMail

	// Server and other services settings
	form.OfflineMode = setting.OfflineMode
	form.DisableGravatar = setting.DisableGravatar
	form.DisableRegistration = setting.Service.DisableRegistration
	form.EnableCaptcha = setting.Service.EnableCaptcha
	form.RequireSignInView = setting.Service.RequireSignInView

	auth.AssignForm(form, ctx.Data)
	ctx.HTML(200, INSTALL)
}

// IsRunUserMatchCurrentUser returns false if configured run user does not match
// actual user that runs the app. The first return value is the actual user name.
// This check is ignored under Windows since SSH remote login is not the main
// method to login on Windows.
func IsRunUserMatchCurrentUser(runUser string) (string, bool) {
	if IsWindows {
		return "", true
	}

	currentUser := user.CurrentUsername()
	return currentUser, runUser == currentUser
}

//.........这里部分代码省略.........
	CookieUserName = sec.Key("COOKIE_USERNAME").String()
	CookieRememberName = sec.Key("COOKIE_REMEMBER_NAME").String()
	ReverseProxyAuthUser = sec.Key("REVERSE_PROXY_AUTHENTICATION_USER").MustString("X-WEBAUTH-USER")

	sec = Cfg.Section("attachment")
	AttachmentPath = sec.Key("PATH").MustString(path.Join(AppDataPath, "attachments"))
	if !filepath.IsAbs(AttachmentPath) {
		AttachmentPath = path.Join(workDir, AttachmentPath)
	}
	AttachmentAllowedTypes = strings.Replace(sec.Key("ALLOWED_TYPES").MustString("image/jpeg,image/png"), "|", ",", -1)
	AttachmentMaxSize = sec.Key("MAX_SIZE").MustInt64(4)
	AttachmentMaxFiles = sec.Key("MAX_FILES").MustInt(5)
	AttachmentEnabled = sec.Key("ENABLE").MustBool(true)

	TimeFormat = map[string]string{
		"ANSIC":       time.ANSIC,
		"UnixDate":    time.UnixDate,
		"RubyDate":    time.RubyDate,
		"RFC822":      time.RFC822,
		"RFC822Z":     time.RFC822Z,
		"RFC850":      time.RFC850,
		"RFC1123":     time.RFC1123,
		"RFC1123Z":    time.RFC1123Z,
		"RFC3339":     time.RFC3339,
		"RFC3339Nano": time.RFC3339Nano,
		"Kitchen":     time.Kitchen,
		"Stamp":       time.Stamp,
		"StampMilli":  time.StampMilli,
		"StampMicro":  time.StampMicro,
		"StampNano":   time.StampNano,
	}[Cfg.Section("time").Key("FORMAT").MustString("RFC1123")]

	RunUser = Cfg.Section("").Key("RUN_USER").String()
	curUser := user.CurrentUsername()
	// Does not check run user when the install lock is off.
	if InstallLock && RunUser != curUser {
		log.Fatal(4, "Expect user(%s) but current user is: %s", RunUser, curUser)
	}

	// Determine and create root git repository path.
	sec = Cfg.Section("repository")
	RepoRootPath = sec.Key("ROOT").MustString(path.Join(homeDir, "gogs-repositories"))
	forcePathSeparator(RepoRootPath)
	if !filepath.IsAbs(RepoRootPath) {
		RepoRootPath = path.Join(workDir, RepoRootPath)
	} else {
		RepoRootPath = path.Clean(RepoRootPath)
	}
	ScriptType = sec.Key("SCRIPT_TYPE").MustString("bash")
	if err = Cfg.Section("repository").MapTo(&Repository); err != nil {
		log.Fatal(4, "Fail to map Repository settings: %v", err)
	}

	// UI settings.
	sec = Cfg.Section("ui")
	ExplorePagingNum = sec.Key("EXPLORE_PAGING_NUM").MustInt(20)
	IssuePagingNum = sec.Key("ISSUE_PAGING_NUM").MustInt(10)
	FeedMaxCommitNum = sec.Key("FEED_MAX_COMMIT_NUM").MustInt(5)

	sec = Cfg.Section("ui.admin")
	AdminUserPagingNum = sec.Key("USER_PAGING_NUM").MustInt(50)
	AdminRepoPagingNum = sec.Key("REPO_PAGING_NUM").MustInt(50)
	AdminNoticePagingNum = sec.Key("NOTICE_PAGING_NUM").MustInt(50)
	AdminOrgPagingNum = sec.Key("ORG_PAGING_NUM").MustInt(50)

	sec = Cfg.Section("picture")

func InstallPost(ctx *middleware.Context, form auth.InstallForm) {
	ctx.Data["CurDbOption"] = form.DbType

	if ctx.HasError() {
		if ctx.HasValue("Err_SMTPEmail") {
			ctx.Data["Err_SMTP"] = true
		}
		if ctx.HasValue("Err_AdminName") ||
			ctx.HasValue("Err_AdminPasswd") ||
			ctx.HasValue("Err_AdminEmail") {
			ctx.Data["Err_Admin"] = true
		}

		ctx.HTML(200, INSTALL)
		return
	}

	if _, err := exec.LookPath("git"); err != nil {
		ctx.RenderWithErr(ctx.Tr("install.test_git_failed", err), INSTALL, &form)
		return
	}

	// Pass basic check, now test configuration.
	// Test database setting.
	dbTypes := map[string]string{"MySQL": "mysql", "PostgreSQL": "postgres", "SQLite3": "sqlite3", "TiDB": "tidb"}
	models.DbCfg.Type = dbTypes[form.DbType]
	models.DbCfg.Host = form.DbHost
	models.DbCfg.User = form.DbUser
	models.DbCfg.Passwd = form.DbPasswd
	models.DbCfg.Name = form.DbName
	models.DbCfg.SSLMode = form.SSLMode
	models.DbCfg.Path = form.DbPath

	if (models.DbCfg.Type == "sqlite3" || models.DbCfg.Type == "tidb") &&
		len(models.DbCfg.Path) == 0 {
		ctx.Data["Err_DbPath"] = true
		ctx.RenderWithErr(ctx.Tr("install.err_empty_db_path"), INSTALL, &form)
		return
	} else if models.DbCfg.Type == "tidb" &&
		strings.ContainsAny(path.Base(models.DbCfg.Path), ".-") {
		ctx.Data["Err_DbPath"] = true
		ctx.RenderWithErr(ctx.Tr("install.err_invalid_tidb_name"), INSTALL, &form)
		return
	}

	// Set test engine.
	var x *xorm.Engine
	if err := models.NewTestEngine(x); err != nil {
		if strings.Contains(err.Error(), `Unknown database type: sqlite3`) {
			ctx.Data["Err_DbType"] = true
			ctx.RenderWithErr(ctx.Tr("install.sqlite3_not_available", "http://gogs.io/docs/installation/install_from_binary.html"), INSTALL, &form)
		} else {
			ctx.Data["Err_DbSetting"] = true
			ctx.RenderWithErr(ctx.Tr("install.invalid_db_setting", err), INSTALL, &form)
		}
		return
	}

	// Test repository root path.
	if err := os.MkdirAll(form.RepoRootPath, os.ModePerm); err != nil {
		ctx.Data["Err_RepoRootPath"] = true
		ctx.RenderWithErr(ctx.Tr("install.invalid_repo_path", err), INSTALL, &form)
		return
	}

	// Check run user.
	curUser := user.CurrentUsername()
	if form.RunUser != curUser {
		ctx.Data["Err_RunUser"] = true
		ctx.RenderWithErr(ctx.Tr("install.run_user_not_match", form.RunUser, curUser), INSTALL, &form)
		return
	}

	// Check logic loophole between disable self-registration and no admin account.
	if form.DisableRegistration && len(form.AdminName) == 0 {
		ctx.Data["Err_Services"] = true
		ctx.Data["Err_Admin"] = true
		ctx.RenderWithErr(ctx.Tr("install.no_admin_and_disable_registration"), INSTALL, form)
		return
	}

	// Check admin password.
	if len(form.AdminName) > 0 && len(form.AdminPasswd) == 0 {
		ctx.Data["Err_Admin"] = true
		ctx.Data["Err_AdminPasswd"] = true
		ctx.RenderWithErr(ctx.Tr("install.err_empty_admin_password"), INSTALL, form)
		return
	}
	if form.AdminPasswd != form.AdminConfirmPasswd {
		ctx.Data["Err_Admin"] = true
		ctx.Data["Err_AdminPasswd"] = true
		ctx.RenderWithErr(ctx.Tr("form.password_not_match"), INSTALL, form)
		return
	}

	if form.AppUrl[len(form.AppUrl)-1] != '/' {
		form.AppUrl += "/"
	}

	// Save settings.
//.........这里部分代码省略.........