Add repository setting to enable/disable health checks (#3607)

New Feature:
  * Repository struct field for IsFsckEnabled (default true of course)
  * Admin Settings section on repo options page, accessible only by
    admin users

Possible Enhancements:
  * There's no way to force running health checks on all repos
    regardless of their IsFsckEnabled setting. This would be useful if
    there were an admin API or dashboard button to run fsck immediately.

Issue: https://github.com/go-gitea/gitea/issues/1712
Signed-off-by: Allen Wild <allenwild93@gmail.com>

models/migrations/migrations.go

 	NewMigration("add label descriptions", addLabelsDescriptions),
 	// v59 -> v60
 	NewMigration("add merge whitelist for protected branches", addProtectedBranchMergeWhitelist),
+	// v60 -> v61
+	NewMigration("add is_fsck_enabled column for repos", addFsckEnabledToRepo),
 }
 
 // Migrate database to current version

models/migrations/v60.go

+// Copyright 2018 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package migrations
+
+import (
+	"fmt"
+
+	"github.com/go-xorm/xorm"
+)
+
+func addFsckEnabledToRepo(x *xorm.Engine) error {
+	type Repository struct {
+		IsFsckEnabled bool `xorm:"NOT NULL DEFAULT true"`
+	}
+
+	if err := x.Sync2(new(Repository)); err != nil {
+		return fmt.Errorf("Sync2: %v", err)
+	}
+	return nil
+}

models/repo.go

 	BaseRepo      *Repository        `xorm:"-"`
 	Size          int64              `xorm:"NOT NULL DEFAULT 0"`
 	IndexerStatus *RepoIndexerStatus `xorm:"-"`
+	IsFsckEnabled bool               `xorm:"NOT NULL DEFAULT true"`
 
 	CreatedUnix util.TimeStamp `xorm:"INDEX created"`
 	UpdatedUnix util.TimeStamp `xorm:"INDEX updated"`
 	log.Trace("Doing: GitFsck")
 
 	if err := x.
-		Where("id>0").BufferSize(setting.IterateBufferSize).
+		Where("id>0 AND is_fsck_enabled=?", true).BufferSize(setting.IterateBufferSize).
 		Iterate(new(Repository),
 			func(idx int, bean interface{}) error {
 				repo := bean.(*Repository)
 				repoPath := repo.RepoPath()
-				log.Trace(fmt.Sprintf("Running health check for repository %s", repoPath))
+				log.Trace("Running health check on repository %s", repoPath)
 				if err := git.Fsck(repoPath, setting.Cron.RepoHealthCheck.Timeout, setting.Cron.RepoHealthCheck.Args...); err != nil {
 					desc := fmt.Sprintf("Failed to health check repository (%s): %v", repoPath, err)
 					log.Warn(desc)

modules/auth/repo_form.go

 	PullsAllowSquash                 bool
 	EnableTimetracker                bool
 	AllowOnlyContributorsToTrackTime bool
+
+	// Admin settings
+	EnableHealthCheck bool
 }
 
 // Validate validates the fields

options/locale/locale_en-US.ini

 settings.pulls.allow_merge_commits = Allow merge commits
 settings.pulls.allow_rebase_merge = Allow rebase to merge commits
 settings.pulls.allow_squash_commits = Allow to squash commits before merging
+settings.admin_settings = Admin Settings
+settings.admin_enable_health_check = Enable health checks (git fsck) for this repo
 settings.danger_zone = Danger Zone
 settings.new_owner_has_same_repo = The new owner already has a repository with same name. Please choose another name.
 settings.convert = Convert To Regular Repository

routers/repo/setting.go

 		ctx.Flash.Success(ctx.Tr("repo.settings.update_settings_success"))
 		ctx.Redirect(ctx.Repo.RepoLink + "/settings")
 
+	case "admin":
+		if !ctx.User.IsAdmin {
+			ctx.Error(403)
+			return
+		}
+
+		if repo.IsFsckEnabled != form.EnableHealthCheck {
+			repo.IsFsckEnabled = form.EnableHealthCheck
+			if err := models.UpdateRepository(repo, false); err != nil {
+				ctx.ServerError("UpdateRepository", err)
+				return
+			}
+			log.Trace("Repository admin settings updated: %s/%s", ctx.Repo.Owner.Name, repo.Name)
+		}
+
+		ctx.Flash.Success(ctx.Tr("repo.settings.update_settings_success"))
+		ctx.Redirect(ctx.Repo.RepoLink + "/settings")
+
 	case "convert":
 		if !ctx.Repo.IsOwner() {
 			ctx.Error(404)

templates/repo/settings/options.tmpl

 			</form>
 		</div>
 
+		{{if .IsAdmin}}
+		<h4 class="ui top attached header">
+			{{.i18n.Tr "repo.settings.admin_settings"}}
+		</h4>
+		<div class="ui attached segment">
+			<form class="ui form" method="post">
+				{{.CsrfTokenHtml}}
+				<input type="hidden" name="action" value="admin">
+				<div class="field">
+					<div class="ui checkbox">
+						<input name="enable_health_check" type="checkbox" {{if .Repository.IsFsckEnabled}}checked{{end}}>
+						<label>{{.i18n.Tr "repo.settings.admin_enable_health_check"}}</label>
+					</div>
+				</div>
+
+				<div class="ui divider"></div>
+				<div class="field">
+					<button class="ui green button">{{$.i18n.Tr "repo.settings.update_settings"}}</button>
+				</div>
+			</form>
+		</div>
+		{{end}}
+
 		{{if .IsRepositoryOwner}}
 		<h4 class="ui top attached warning header">
 			{{.i18n.Tr "repo.settings.danger_zone"}}