Show edge and site versions with Update buttons; Update now for Hammerhead itself

Edges and sites report their version and whether auto-update is on. Hammerhead can ask a machine that
has auto-update on to install the newest release, and shows the outcome. Requests carry an ID so a
stale result can't answer a new one.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

agent.go

@@ -76,6 +76,7 @@ func (s *Server) edgeConfig(w http.ResponseWriter, r *http.Request) {
 	if m := s.selfMapping(e); m != nil {
 		cfg.Mappings = append(cfg.Mappings, *m)
 	}
+	cfg.UpdateID = e.UpdateID
 	cfg.MailEgress = []model.MailPolicy{}
 	for _, x := range s.st.MailEgress {
 		if x.EdgeID == e.ID && x.Enabled {
@@ -110,6 +111,7 @@ func (s *Server) edgeReport(w http.ResponseWriter, r *http.Request) {
 	}
 	e.LastSeen = time.Now()
 	e.IPs = in.IPs
+	answered := noteUpdateReport(&e.Version, &e.AutoUpdate, &e.UpdateID, &e.UpdateMsg, in.Version, in.AutoUpdate, in.UpdateID, in.UpdateMsg)
 	for _, x := range s.st.MailEgress {
 		if x.EdgeID == e.ID {
 			if chk, found := in.MailChecks[x.ID]; found {
@@ -146,6 +148,8 @@ func (s *Server) edgeReport(w http.ResponseWriter, r *http.Request) {
 	if e.PublicKey != in.PublicKey {
 		e.PublicKey = in.PublicKey
 		s.bump() // sites need the edge's new key
+	} else if answered {
+		s.bump() // the edge's config no longer carries the update request
 	} else {
 		s.save()
 	}
@@ -205,7 +209,7 @@ func (s *Server) siteConfig(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	st.LastSeen = time.Now()
-	cfg := model.SiteConfig{Version: s.st.Version, SiteID: st.ID, TunnelIP: st.TunnelIP, Edges: []model.EdgeRef{}, MailEgress: []model.MailSpec{}}
+	cfg := model.SiteConfig{Version: s.st.Version, SiteID: st.ID, TunnelIP: st.TunnelIP, Edges: []model.EdgeRef{}, MailEgress: []model.MailSpec{}, UpdateID: st.UpdateID}
 	seen := map[string]bool{}
 	addEdge := func(id string) {
 		if seen[id] {
@@ -249,6 +253,7 @@ func (s *Server) siteReport(w http.ResponseWriter, r *http.Request) {
 		in.Connected = []string{}
 	}
 	st.Connected = in.Connected
+	answered := noteUpdateReport(&st.Version, &st.AutoUpdate, &st.UpdateID, &st.UpdateMsg, in.Version, in.AutoUpdate, in.UpdateID, in.UpdateMsg)
 	s.containers[st.ID] = in.Containers
 	for _, x := range s.st.MailEgress {
 		if x.SiteID != st.ID {
@@ -263,6 +268,8 @@ func (s *Server) siteReport(w http.ResponseWriter, r *http.Request) {
 	if in.PublicKey != "" && st.PublicKey != in.PublicKey {
 		st.PublicKey = in.PublicKey
 		s.bump() // every edge this site talks to needs the new key
+	} else if answered {
+		s.bump() // the site's config no longer carries the update request
 	}
 	ok(w)
 }