Refuse a converged genesis on a machine in use, naming every container and listener counted (hq ADR 0100)

2026-09-22 17:29:32 +02:00
parent 3964d9da0a
commit 4811f176fd
3 changed files with 217 additions and 0 deletions
@@ -0,0 +1,99 @@
+package bootstrap
+
+import (
+	"context"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/novox/mesh-host/internal/store"
+)
+
+// Defends novox/hq ADR 0100: a converged genesis refuses a machine in use, naming every container
+// and listener it counted.
+
+// Lines as `ss -Hltunp` prints them. The ssh, samba, loopback and proxy lines are captured from a
+// real machine; the resolver, DHCP and time lines are written in the same shape for the processes a
+// fresh machine runs, and still need measuring against one.
+const inUseSockets = `tcp LISTEN 0      128                                        0.0.0.0:22    0.0.0.0:* users:(("sshd",pid=1188536,fd=6))
+tcp LISTEN 0      128                                           [::]:22       [::]:* users:(("sshd",pid=1188536,fd=7))
+tcp LISTEN 0      32                                       127.0.0.1:53    0.0.0.0:* users:(("dnsmasq",pid=1189392,fd=7))
+tcp LISTEN 0      4096                                     127.0.0.1:5432  0.0.0.0:* users:(("docker-proxy",pid=1854543,fd=7))
+udp UNCONN 0      0                                          0.0.0.0:5355  0.0.0.0:* users:(("systemd-resolve",pid=301,fd=11))
+udp UNCONN 0      0                                    192.0.2.10%eth0:68  0.0.0.0:* users:(("systemd-network",pid=280,fd=19))
+udp UNCONN 0      0                                          0.0.0.0:68    0.0.0.0:* users:(("dhcpcd",pid=270,fd=9))
+udp UNCONN 0      0                                          0.0.0.0:123   0.0.0.0:* users:(("systemd-timesyn",pid=260,fd=9))
+`
+
+const servingSockets = `tcp LISTEN 0      50                                         0.0.0.0:445   0.0.0.0:* users:(("smbd",pid=1248,fd=29))
+tcp LISTEN 0      4096                                       0.0.0.0:8080  0.0.0.0:* users:(("docker-proxy",pid=1920035,fd=7))
+udp UNCONN 0      0                                          0.0.0.0:123   0.0.0.0:* users:(("ntpd",pid=1070791,fd=17))
+`
+
+type inUseRunner struct{ ps, ss string }
+
+func (m inUseRunner) run(_ context.Context, name string, args ...string) (string, error) {
+	if name == "docker" {
+		return m.ps, nil
+	}
+	return m.ss, nil
+}
+
+func TestAFreshMachineIsNotInUse(t *testing.T) {
+	containers, listeners, err := InUse(context.Background(), inUseRunner{ss: inUseSockets}.run,
+		func(string) bool { return false })
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(containers) != 0 || len(listeners) != 0 {
+		t.Errorf("ssh, loopback, name resolution, DHCP and time were counted: %v %v", containers, listeners)
+	}
+}
+
+func TestAMachineServingIsInUse(t *testing.T) {
+	m := inUseRunner{ps: "hello-web\t\nmesh-store\tabc123\n", ss: inUseSockets + servingSockets}
+	containers, listeners, err := InUse(context.Background(), m.run, func(string) bool { return false })
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(containers) != 1 || containers[0] != "hello-web" {
+		t.Errorf("containers counted: %v (one a host made is not a predecessor's)", containers)
+	}
+	var by []string
+	for _, l := range listeners {
+		by = append(by, l.By)
+	}
+	if strings.Join(by, " ") != "smbd docker-proxy ntpd" {
+		t.Errorf("listeners counted: %v", listeners)
+	}
+}
+
+func TestAConvergedGenesisRefusesAMachineInUseNamingEverything(t *testing.T) {
+	o := Options{State: filepath.Join(t.TempDir(), "state.json")}
+	m := inUseRunner{ps: "hello-web\t\n", ss: inUseSockets + servingSockets}
+	err := RefuseAMachineInUse(context.Background(), o, m.run, quietly)
+	if err == nil {
+		t.Fatal("a machine in use was not refused")
+	}
+	for _, want := range []string{"container hello-web", "tcp 0.0.0.0:445 by smbd", "tcp 0.0.0.0:8080 by docker-proxy",
+		"udp 0.0.0.0:123 by ntpd", "--adopted"} {
+		if !strings.Contains(err.Error(), want) {
+			t.Errorf("the refusal does not name %q: %v", want, err)
+		}
+	}
+	o.Adopted = true
+	if err := RefuseAMachineInUse(context.Background(), o, m.run, quietly); err != nil {
+		t.Errorf("an adopted genesis was refused a machine in use: %v", err)
+	}
+}
+
+func TestARerunOfGenesisIsNotAMachineInUse(t *testing.T) {
+	o := Options{State: filepath.Join(t.TempDir(), "state.json")}
+	if err := store.Save(o.State, store.State{Resources: []store.Applied{{ID: "store", Type: "container", Target: "mesh-store"}}}); err != nil {
+		t.Fatal(err)
+	}
+	m := inUseRunner{ps: "mesh-gitea-server\t\n", ss: servingSockets}
+	if err := RefuseAMachineInUse(context.Background(), o, m.run, quietly); err != nil {
+		t.Errorf("what an earlier genesis raised was counted as a machine in use: %v", err)
+	}
+}