| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "errors" |
| 5 | "net" |
| 6 | "os" |
| 7 | "path/filepath" |
| 8 | "syscall" |
| 9 | "testing" |
| 10 | "time" |
| 11 | ) |
| 12 | |
| 13 | // TestNotifyReadyWritesToTheSocket: the whole contract. systemd hands the |
| 14 | // process a unixgram socket path in NOTIFY_SOCKET and waits for READY=1 |
| 15 | // before calling the unit started — which is what turns "exec'd" into |
| 16 | // "actually serving" for the adopt pass's restart check. |
| 17 | // |
| 18 | // Uses os.MkdirTemp directly (NOT t.TempDir): t.TempDir embeds the test |
| 19 | // name in the path it hands back, and AF_UNIX socket paths are capped at |
| 20 | // sizeof(sockaddr_un.sun_path) — 108 bytes on Linux. A long test name under |
| 21 | // a long TMPDIR pushes that over the limit and net.ListenPacket fails with |
| 22 | // "invalid argument", which is a test-harness artifact, not evidence |
| 23 | // unixgram sockets are unsupported here — so only the genuinely-unsupported |
| 24 | // errors (EAFNOSUPPORT, EPERM) are allowed to skip the test; anything else, |
| 25 | // including a too-long path, must fail loudly. |
| 26 | func TestNotifyReadyWritesToTheSocket(t *testing.T) { |
| 27 | dir, err := os.MkdirTemp("", "n") |
| 28 | if err != nil { |
| 29 | t.Fatalf("MkdirTemp: %v", err) |
| 30 | } |
| 31 | t.Cleanup(func() { os.RemoveAll(dir) }) |
| 32 | sock := filepath.Join(dir, "n.sock") |
| 33 | conn, err := net.ListenPacket("unixgram", sock) |
| 34 | if err != nil { |
| 35 | if errors.Is(err, syscall.EAFNOSUPPORT) || errors.Is(err, syscall.EPERM) { |
| 36 | t.Skipf("unixgram unavailable here: %v", err) |
| 37 | } |
| 38 | t.Fatalf("ListenPacket(unixgram, %s): %v", sock, err) |
| 39 | } |
| 40 | defer conn.Close() |
| 41 | t.Setenv("NOTIFY_SOCKET", sock) |
| 42 | |
| 43 | if err := NotifyReady(); err != nil { |
| 44 | t.Fatalf("NotifyReady: %v", err) |
| 45 | } |
| 46 | buf := make([]byte, 64) |
| 47 | conn.SetReadDeadline(time.Now().Add(2 * time.Second)) |
| 48 | n, _, err := conn.ReadFrom(buf) |
| 49 | if err != nil { |
| 50 | t.Fatalf("nothing arrived on the notify socket: %v", err) |
| 51 | } |
| 52 | if got := string(buf[:n]); got != "READY=1" { |
| 53 | t.Fatalf("sent %q, want READY=1", got) |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | // TestNotifyReadyIsANoOpOutsideSystemd: the console runs under `go run`, in |
| 58 | // tests and on a laptop, and none of those set NOTIFY_SOCKET. Absent is |
| 59 | // normal, not an error. |
| 60 | func TestNotifyReadyIsANoOpOutsideSystemd(t *testing.T) { |
| 61 | t.Setenv("NOTIFY_SOCKET", "") |
| 62 | if err := NotifyReady(); err != nil { |
| 63 | t.Fatalf("NotifyReady with no socket = %v, want nil", err) |
| 64 | } |
| 65 | } |
| 66 | |
amadan