added lastupdate for downstream mirrors to check

main.go

@@ -412,6 +412,7 @@ func (b *BuildManager) repoWorker(repo string) {
 			res, err = cmd.CombinedOutput()
 			log.Debug(string(res))
 			check(err)
+			updateLastUpdated()
 			b.buildWG.Done()
 		case pkg := <-b.repoPurge[repo]:
 			if _, err := os.Stat(filepath.Join(conf.Basedir.Repo, pkg.FullRepo, "os", conf.Arch, pkg.FullRepo) + ".db.tar.xz"); err != nil {
@@ -448,6 +449,7 @@ func (b *BuildManager) repoWorker(repo string) {
 				check(os.Remove(file))
 				check(os.Remove(file + ".sig"))
 			}
+			updateLastUpdated()
 			b.repoWG.Done()
 		}
 	}

utils.go

@@ -21,6 +21,7 @@ import (
 	"strconv"
 	"strings"
 	"sync"
+	"time"
 )
 
 const (
@@ -28,6 +29,7 @@ const (
 	makepkgConf    = "/usr/share/devtools/makepkg-x86_64.conf"
 	logDir         = "logs"
 	pristineChroot = "root"
+	lastUpdate     = "lastupdate"
 )
 
 type BuildPackage struct {
@@ -102,6 +104,10 @@ func check(e error) {
 	}
 }
 
+func updateLastUpdated() {
+	check(os.WriteFile(filepath.Join(conf.Basedir.Repo, lastUpdate), []byte(strconv.FormatInt(time.Now().Unix(), 10)), 0644))
+}
+
 func b3sum(filePath string) (string, error) {
 	file, err := os.Open(filePath)
 	if err != nil {