f-50: lab: lancement, état, arrêt et accès SSH des VM #50
Signed-off-by: GnomeZworc <nicolas.boufidjeline@g3e.fr>
This commit is contained in:
parent
4b176c22d7
commit
d5dbbe6c66
GPG key ID:
4406BBBF8845D632
10 changed files with 1309 additions and 4 deletions
543
internal/lab/machine/machine_test.go
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543
internal/lab/machine/machine_test.go
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@ -0,0 +1,543 @@
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package machine
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import (
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"bytes"
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"context"
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"crypto/sha512"
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"encoding/hex"
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"errors"
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"fmt"
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"net/http"
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"net/http/httptest"
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"os"
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"os/exec"
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"path/filepath"
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"reflect"
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"strconv"
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"strings"
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"sync"
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"syscall"
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"testing"
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"time"
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"git.g3e.fr/syonad/two/internal/lab/provision"
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"git.g3e.fr/syonad/two/internal/lab/topology"
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)
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const labKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFG/JMmjfko96WkJV8DiL6rip/H/q/R++y8s27Z+Cj6O two-lab"
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type exitErr int
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func (e exitErr) Error() string { return "exit status " + strconv.Itoa(int(e)) }
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func (e exitErr) ExitCode() int { return int(e) }
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type fakeRunner struct {
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mu sync.Mutex
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calls [][]string
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fail string
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ssh map[string][]error
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always map[string]error
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}
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func (f *fakeRunner) Run(_ context.Context, name string, args ...string) error {
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f.mu.Lock()
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defer f.mu.Unlock()
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f.calls = append(f.calls, append([]string{name}, args...))
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if name == f.fail {
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return errors.New(name + " failed")
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}
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switch name {
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case "ssh-keygen":
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private := args[len(args)-1]
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if err := os.WriteFile(private, []byte("private"), 0o600); err != nil {
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return err
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}
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return os.WriteFile(private+".pub", []byte(labKey+"\n"), 0o644)
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case "ssh":
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port := args[indexOf(args, "-p")+1]
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answers := f.ssh[port]
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if len(answers) == 0 {
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return f.always[port]
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}
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f.ssh[port] = answers[1:]
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return answers[0]
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}
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return nil
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}
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func (f *fakeRunner) commands(name string) [][]string {
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f.mu.Lock()
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defer f.mu.Unlock()
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var out [][]string
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for _, c := range f.calls {
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if c[0] == name {
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out = append(out, c)
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}
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}
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return out
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}
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func indexOf(list []string, value string) int {
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for i, v := range list {
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if v == value {
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return i
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}
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}
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return -1
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}
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func mirror(t *testing.T) (*httptest.Server, string) {
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t.Helper()
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content := []byte("qcow2 image")
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h := sha512.Sum512(content)
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server := httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if strings.HasSuffix(r.URL.Path, "SHA512SUMS") {
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fmt.Fprintf(w, "%s deb.qcow2\n", hex.EncodeToString(h[:]))
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return
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}
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w.Write(content)
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}))
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t.Cleanup(server.Close)
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return server, server.URL
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}
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func labPlan(t *testing.T, base, nodes string) *topology.Plan {
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t.Helper()
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doc := `name: evpn-2hv
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images:
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deb:
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url: ` + base + `/deb.qcow2
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sums: ` + base + `/SHA512SUMS
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segments:
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underlay: { switch: sw1, cidr: 10.250.0.0/24, mtu: 9000 }
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nodes:
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` + nodes
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topo, err := topology.Parse([]byte(doc))
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if err != nil {
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t.Fatalf("Parse: %v", err)
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}
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p, err := topology.Compute(topo)
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if err != nil {
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t.Fatalf("Compute: %v", err)
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}
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return p
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}
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const switchLast = ` rr1: { role: rr, image: deb, cpus: 1, memory: 1024, segments: [underlay] }
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hv1: { role: hypervisor, image: deb, cpus: 4, memory: 16384, segments: [underlay] }
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sw1: { role: switch, image: deb, cpus: 2, memory: 1024 }
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`
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type fixture struct {
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lab Lab
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runner *fakeRunner
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out *bytes.Buffer
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fetcher provision.Fetcher
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}
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func newFixture(t *testing.T, nodes string) *fixture {
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t.Helper()
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server, base := mirror(t)
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root := t.TempDir()
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runner := &fakeRunner{ssh: map[string][]error{}, always: map[string]error{}}
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out := &bytes.Buffer{}
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return &fixture{
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lab: Lab{
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Plan: labPlan(t, base, nodes),
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RunDir: filepath.Join(root, "run"),
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ProcDir: filepath.Join(root, "proc"),
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Runner: runner,
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Poll: time.Millisecond,
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Stop: 500 * time.Millisecond,
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Out: out,
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},
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runner: runner,
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out: out,
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fetcher: provision.Fetcher{Client: server.Client(), CacheDir: filepath.Join(root, "cache")},
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}
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}
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func (f *fixture) process(t *testing.T, node, script string, cmdline ...string) int {
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t.Helper()
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cmd := exec.Command("sh", "-c", script)
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if err := cmd.Start(); err != nil {
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t.Fatal(err)
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}
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done := make(chan struct{})
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go func() { cmd.Wait(); close(done) }()
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t.Cleanup(func() {
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cmd.Process.Kill()
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<-done
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})
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pid := cmd.Process.Pid
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proc := filepath.Join(f.lab.ProcDir, strconv.Itoa(pid))
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if err := os.MkdirAll(proc, 0o755); err != nil {
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t.Fatal(err)
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}
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if err := os.WriteFile(filepath.Join(proc, "cmdline"), []byte(strings.Join(cmdline, "\x00")+"\x00"), 0o644); err != nil {
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t.Fatal(err)
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}
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f.pidFile(t, node, strconv.Itoa(pid)+"\n")
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return pid
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}
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func (f *fixture) pidFile(t *testing.T, node, content string) {
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t.Helper()
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dir := filepath.Join(f.lab.RunDir, node)
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if err := os.MkdirAll(dir, 0o700); err != nil {
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t.Fatal(err)
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}
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if err := os.WriteFile(filepath.Join(dir, "qemu.pid"), []byte(content), 0o600); err != nil {
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t.Fatal(err)
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}
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}
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func qemu(node string) []string {
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return []string{"qemu-system-x86_64", "-name", node, "-machine", "q35"}
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}
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func alive(pid int) bool {
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err := syscall.Kill(pid, 0)
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return err == nil || errors.Is(err, syscall.EPERM)
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}
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func waitDead(t *testing.T, pid int) {
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t.Helper()
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deadline := time.Now().Add(2 * time.Second)
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for alive(pid) && time.Now().Before(deadline) {
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time.Sleep(5 * time.Millisecond)
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}
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if alive(pid) {
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t.Errorf("pid %d is still alive", pid)
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}
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}
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func TestPID_NoPidFileMeansStopped(t *testing.T) {
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f := newFixture(t, switchLast)
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if pid, err := f.lab.PID("hv1"); pid != 0 || err != nil {
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t.Errorf("PID = %d, %v", pid, err)
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}
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}
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func TestPID_RefusesACorruptedPidFile(t *testing.T) {
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for _, content := range []string{"", "abc", "0", "-12"} {
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f := newFixture(t, switchLast)
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f.pidFile(t, "hv1", content)
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if _, err := f.lab.PID("hv1"); err == nil || !strings.Contains(err.Error(), "not a pid") {
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t.Errorf("pid file %q: error = %v", content, err)
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}
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}
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}
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func TestPID_RecognisesTheNodeProcess(t *testing.T) {
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f := newFixture(t, switchLast)
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want := f.process(t, "hv1", "sleep 30", qemu("hv1")...)
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if pid, err := f.lab.PID("hv1"); pid != want || err != nil {
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t.Errorf("PID = %d, %v, want %d", pid, err, want)
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}
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}
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func TestPID_IgnoresAPidReusedByAnotherProcess(t *testing.T) {
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cases := map[string][]string{
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"another program": {"/usr/sbin/sshd", "-D"},
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"another node": qemu("hv10"),
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"name as a value": {"qemu-system-x86_64", "-serial", "-name", "-name", "hv2"},
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}
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for name, cmdline := range cases {
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t.Run(name, func(t *testing.T) {
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f := newFixture(t, switchLast)
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f.process(t, "hv1", "sleep 30", cmdline...)
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if pid, err := f.lab.PID("hv1"); pid != 0 || err != nil {
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t.Errorf("PID = %d, %v, want 0", pid, err)
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}
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})
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}
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}
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func TestPID_IgnoresADeadProcess(t *testing.T) {
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f := newFixture(t, switchLast)
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pid := f.process(t, "hv1", "exit 0", qemu("hv1")...)
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waitDead(t, pid)
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if got, err := f.lab.PID("hv1"); got != 0 || err != nil {
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t.Errorf("PID = %d, %v, want 0", got, err)
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}
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}
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func TestStatus(t *testing.T) {
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f := newFixture(t, switchLast)
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pid := strconv.Itoa(f.process(t, "hv1", "sleep 30", qemu("hv1")...))
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var out bytes.Buffer
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if err := f.lab.Status(&out); err != nil {
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t.Fatal(err)
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}
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w := len(pid)
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if w < 3 {
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w = 3
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}
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want := fmt.Sprintf("node role state %-*s ssh\n", w, "pid") +
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fmt.Sprintf("rr1 rr stopped %-*s 127.0.0.1:2200\n", w, "-") +
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fmt.Sprintf("hv1 hypervisor running %-*s 127.0.0.1:2201\n", w, pid) +
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fmt.Sprintf("sw1 switch stopped %-*s 127.0.0.1:2202\n", w, "-")
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if out.String() != want {
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t.Errorf("status:\n%s\nwant:\n%s", out.String(), want)
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}
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}
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func TestDown_StopsWithSIGTERM(t *testing.T) {
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f := newFixture(t, switchLast)
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pid := f.process(t, "hv1", "sleep 30", qemu("hv1")...)
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if err := f.lab.Down(context.Background()); err != nil {
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t.Fatalf("Down: %v", err)
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}
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waitDead(t, pid)
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if _, err := os.Stat(filepath.Join(f.lab.RunDir, "hv1", "qemu.pid")); !os.IsNotExist(err) {
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t.Errorf("pid file still there: %v", err)
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}
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if f.out.String() != "hv1: stopped\n" {
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t.Errorf("output = %q", f.out.String())
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}
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}
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func TestDown_FallsBackToSIGKILL(t *testing.T) {
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f := newFixture(t, switchLast)
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f.lab.Stop = 100 * time.Millisecond
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pid := f.process(t, "hv1", `trap "" TERM; while :; do sleep 0.05; done`, qemu("hv1")...)
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time.Sleep(50 * time.Millisecond)
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start := time.Now()
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if err := f.lab.Down(context.Background()); err != nil {
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t.Fatalf("Down: %v", err)
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}
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waitDead(t, pid)
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if elapsed := time.Since(start); elapsed < 100*time.Millisecond {
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t.Errorf("SIGKILL after %v, want at least the 100ms grace period", elapsed)
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}
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}
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func TestDown_NeverSignalsAProcessThatIsNotTheNode(t *testing.T) {
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f := newFixture(t, switchLast)
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pid := f.process(t, "hv1", "sleep 30", "/usr/sbin/sshd", "-D")
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if err := f.lab.Down(context.Background()); err != nil {
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t.Fatalf("Down: %v", err)
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}
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time.Sleep(50 * time.Millisecond)
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if !alive(pid) {
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t.Error("a process that is not the node was killed")
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}
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if f.out.Len() != 0 {
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t.Errorf("output = %q", f.out.String())
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}
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}
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func TestDown_ReportsACorruptedPidFileAndStopsTheOthers(t *testing.T) {
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f := newFixture(t, switchLast)
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f.pidFile(t, "rr1", "garbage")
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pid := f.process(t, "hv1", "sleep 30", qemu("hv1")...)
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err := f.lab.Down(context.Background())
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if err == nil || !strings.Contains(err.Error(), "not a pid") {
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t.Errorf("error = %v", err)
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}
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waitDead(t, pid)
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}
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func TestSSH_Arguments(t *testing.T) {
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f := newFixture(t, switchLast)
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key := filepath.Join(f.lab.RunDir, "lab_ed25519")
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base := []string{
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"-i", key,
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"-o", "IdentitiesOnly=yes",
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"-o", "IdentityAgent=none",
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"-o", "StrictHostKeyChecking=no",
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"-o", "UserKnownHostsFile=/dev/null",
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"-o", "LogLevel=ERROR",
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"-p", "2201",
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"debian@127.0.0.1",
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}
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cases := map[string]struct {
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terminal bool
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command []string
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want []string
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}{
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"interactive shell": {true, nil, append([]string{"ssh"}, base...)},
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"command from a terminal": {true, []string{"top"}, append(append([]string{"ssh", "-t"}, base...), "top")},
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"command from a script": {false, []string{"ip", "-br", "a"}, append(append([]string{"ssh"}, base...), "ip", "-br", "a")},
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"shell from a script": {false, nil, append([]string{"ssh"}, base...)},
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}
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for name, c := range cases {
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t.Run(name, func(t *testing.T) {
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got, err := f.lab.SSH("hv1", c.terminal, c.command)
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if err != nil {
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t.Fatal(err)
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}
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if !reflect.DeepEqual(got, c.want) {
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t.Errorf("\n got %q\nwant %q", got, c.want)
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}
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})
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}
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}
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func TestSSH_UnknownNode(t *testing.T) {
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f := newFixture(t, switchLast)
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if _, err := f.lab.SSH("hv9", true, nil); err == nil || !strings.Contains(err.Error(), `node "hv9" is not in lab evpn-2hv`) {
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t.Errorf("error = %v", err)
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}
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}
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func TestUp_StartsSwitchesFirstAndWaitsForEveryNode(t *testing.T) {
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f := newFixture(t, switchLast)
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if err := f.lab.Up(context.Background(), f.fetcher, time.Second); err != nil {
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t.Fatalf("Up: %v", err)
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}
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var started []string
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for _, c := range f.runner.commands("qemu-system-x86_64") {
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if c[len(c)-1] != "-daemonize" {
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t.Errorf("qemu not daemonized: %q", c)
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}
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started = append(started, c[indexOf(c, "-name")+1])
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}
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if !reflect.DeepEqual(started, []string{"sw1", "rr1", "hv1"}) {
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t.Errorf("start order = %v, want the switch first", started)
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}
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ssh := f.runner.commands("ssh")
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if len(ssh) != 3 {
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t.Fatalf("%d ssh calls, want 3", len(ssh))
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}
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want := []string{"ssh",
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"-i", filepath.Join(f.lab.RunDir, "lab_ed25519"),
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"-o", "IdentitiesOnly=yes",
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"-o", "IdentityAgent=none",
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"-o", "StrictHostKeyChecking=no",
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"-o", "UserKnownHostsFile=/dev/null",
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"-o", "LogLevel=ERROR",
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"-p", "2200",
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"-o", "BatchMode=yes",
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"-o", "ConnectTimeout=5",
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"debian@127.0.0.1",
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"cloud-init", "status", "--wait",
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}
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if !reflect.DeepEqual(ssh[0], want) {
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t.Errorf("readiness check:\n got %q\nwant %q", ssh[0], want)
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}
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if f.out.String() != "sw1: started\nrr1: started\nhv1: started\nrr1: ready\nhv1: ready\nsw1: ready\n" {
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t.Errorf("output = %q", f.out.String())
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}
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}
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func TestUp_RetriesWhileSSHIsUnreachable(t *testing.T) {
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f := newFixture(t, switchLast)
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f.runner.ssh["2201"] = []error{exitErr(255), exitErr(255), nil}
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if err := f.lab.Up(context.Background(), f.fetcher, time.Second); err != nil {
|
||||
t.Fatalf("Up: %v", err)
|
||||
}
|
||||
if n := len(f.runner.commands("ssh")); n != 5 {
|
||||
t.Errorf("%d ssh calls, want 5", n)
|
||||
}
|
||||
}
|
||||
|
||||
func TestUp_ReadinessFailures(t *testing.T) {
|
||||
cases := map[string]struct {
|
||||
answers []error
|
||||
want string
|
||||
}{
|
||||
"cloud-init error": {[]error{exitErr(1)}, "node hv1: cloud-init failed: exit status 1"},
|
||||
"not an exit status": {[]error{errors.New("fork failed")}, "node hv1: cloud-init failed: fork failed"},
|
||||
"ssh never reachable": {nil, "node hv1: not reachable over ssh: context deadline exceeded"},
|
||||
}
|
||||
for name, c := range cases {
|
||||
t.Run(name, func(t *testing.T) {
|
||||
f := newFixture(t, switchLast)
|
||||
f.lab.Poll = 10 * time.Millisecond
|
||||
f.runner.ssh["2201"] = c.answers
|
||||
f.runner.always["2201"] = exitErr(255)
|
||||
|
||||
err := f.lab.Up(context.Background(), f.fetcher, 300*time.Millisecond)
|
||||
|
||||
if err == nil || err.Error() != c.want {
|
||||
t.Errorf("error = %v, want %q", err, c.want)
|
||||
}
|
||||
if !strings.Contains(f.out.String(), "rr1: ready\n") || !strings.Contains(f.out.String(), "sw1: ready\n") {
|
||||
t.Errorf("the other nodes were not waited for: %q", f.out.String())
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
func TestUp_RecoverableCloudInitErrorsAreReportedNotFatal(t *testing.T) {
|
||||
f := newFixture(t, switchLast)
|
||||
f.runner.ssh["2201"] = []error{exitErr(2)}
|
||||
|
||||
if err := f.lab.Up(context.Background(), f.fetcher, time.Second); err != nil {
|
||||
t.Fatalf("Up: %v", err)
|
||||
}
|
||||
if !strings.Contains(f.out.String(), "hv1: cloud-init finished with recoverable errors: exit status 2\nhv1: ready\n") {
|
||||
t.Errorf("output = %q", f.out.String())
|
||||
}
|
||||
}
|
||||
|
||||
func TestUp_RefusesARunningLab(t *testing.T) {
|
||||
f := newFixture(t, switchLast)
|
||||
f.process(t, "hv1", "sleep 30", qemu("hv1")...)
|
||||
|
||||
err := f.lab.Up(context.Background(), f.fetcher, time.Second)
|
||||
|
||||
if err == nil || err.Error() != "lab evpn-2hv is already running (hv1): 'lab down' first" {
|
||||
t.Errorf("error = %v", err)
|
||||
}
|
||||
if len(f.runner.calls) != 0 {
|
||||
t.Errorf("commands ran: %q", f.runner.calls)
|
||||
}
|
||||
}
|
||||
|
||||
func TestUp_RemovesAStalePidFileBeforeStarting(t *testing.T) {
|
||||
f := newFixture(t, switchLast)
|
||||
pid := f.process(t, "hv1", "exit 0", qemu("hv1")...)
|
||||
waitDead(t, pid)
|
||||
|
||||
if err := f.lab.Up(context.Background(), f.fetcher, time.Second); err != nil {
|
||||
t.Fatalf("Up: %v", err)
|
||||
}
|
||||
if _, err := os.Stat(filepath.Join(f.lab.RunDir, "hv1", "qemu.pid")); !os.IsNotExist(err) {
|
||||
t.Errorf("stale pid file kept: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
func TestUp_StopsAtTheFirstQEMUFailure(t *testing.T) {
|
||||
f := newFixture(t, switchLast)
|
||||
f.runner.fail = "qemu-system-x86_64"
|
||||
|
||||
err := f.lab.Up(context.Background(), f.fetcher, time.Second)
|
||||
|
||||
if err == nil || err.Error() != "node sw1: qemu-system-x86_64 failed" {
|
||||
t.Errorf("error = %v", err)
|
||||
}
|
||||
if n := len(f.runner.commands("qemu-system-x86_64")); n != 1 {
|
||||
t.Errorf("%d qemu starts, want 1", n)
|
||||
}
|
||||
if n := len(f.runner.commands("ssh")); n != 0 {
|
||||
t.Errorf("%d ssh calls after a failed start", n)
|
||||
}
|
||||
}
|
||||
|
||||
func TestStop_RefusesPidsThatTargetAGroup(t *testing.T) {
|
||||
f := newFixture(t, switchLast)
|
||||
f.lab.signal = func(pid int, sig syscall.Signal) error {
|
||||
t.Fatalf("signal %v sent to pid %d", sig, pid)
|
||||
return nil
|
||||
}
|
||||
for _, pid := range []int{0, -1} {
|
||||
if err := f.lab.stop(context.Background(), "hv1", pid); err == nil || err.Error() != fmt.Sprintf("refusing to signal pid %d", pid) {
|
||||
t.Errorf("pid %d: error = %v", pid, err)
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue