574 lines
18 KiB
Go
574 lines
18 KiB
Go
package cli
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import (
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"bytes"
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"context"
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"crypto/sha1"
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"encoding/hex"
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"fmt"
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"io"
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"net"
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"os"
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"os/exec"
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"path/filepath"
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"strconv"
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"strings"
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"syscall"
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"time"
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)
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type SSHTarget struct {
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User string
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Host string
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Key string
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Port string
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FallbackPorts []string
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}
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func sshTargetFromConfig(cfg Config, host string) SSHTarget {
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return sshTargetForLease(cfg, host, cfg.SSHUser, cfg.SSHPort)
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}
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func sshTargetForLease(cfg Config, host, user, port string) SSHTarget {
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if user == "" {
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user = cfg.SSHUser
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}
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if port == "" {
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port = cfg.SSHPort
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}
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return SSHTarget{
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User: user,
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Host: host,
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Key: cfg.SSHKey,
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Port: port,
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FallbackPorts: cfg.SSHFallbackPorts,
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}
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}
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func waitForSSH(ctx context.Context, target *SSHTarget, stderr io.Writer) error {
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return waitForSSHReady(ctx, target, stderr, "bootstrap", 20*time.Minute)
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}
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func waitForSSHReady(ctx context.Context, target *SSHTarget, stderr io.Writer, phase string, timeout time.Duration) error {
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start := time.Now()
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deadline := time.Now().Add(timeout)
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for {
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if ctx.Err() != nil {
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return context.Cause(ctx)
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}
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if time.Now().After(deadline) {
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return exit(5, "timed out waiting for SSH on %s during %s", target.Host, phase)
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}
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reachablePort := ""
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for _, port := range sshPortCandidates(target.Port, target.FallbackPorts) {
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probe := *target
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probe.Port = port
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conn, err := net.DialTimeout("tcp", net.JoinHostPort(probe.Host, probe.Port), 5*time.Second)
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if err != nil {
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continue
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}
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_ = conn.Close()
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if reachablePort == "" {
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reachablePort = probe.Port
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}
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if runSSHQuiet(ctx, probe, sshReadyCommand()) == nil {
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if target.Port != probe.Port {
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fmt.Fprintf(stderr, "using ssh port %s for %s (configured %s not ready)\n", probe.Port, target.Host, target.Port)
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target.Port = probe.Port
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}
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return nil
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}
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}
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fmt.Fprintln(stderr, sshWaitProgressMessage(target, phase, reachablePort, time.Since(start), time.Until(deadline)))
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time.Sleep(10 * time.Second)
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}
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}
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func sshWaitProgressMessage(target *SSHTarget, phase, reachablePort string, elapsed, remaining time.Duration) string {
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if remaining < 0 {
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remaining = 0
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}
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elapsed = elapsed.Round(time.Second)
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remaining = remaining.Round(time.Second)
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if reachablePort != "" {
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return fmt.Sprintf("waiting for %s:%s %s toolchain... elapsed=%s remaining=%s", target.Host, reachablePort, phase, elapsed, remaining)
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}
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return fmt.Sprintf("waiting for %s:%s %s... elapsed=%s remaining=%s", target.Host, target.Port, phase, elapsed, remaining)
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}
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func probeSSHReady(ctx context.Context, target *SSHTarget, timeout time.Duration) bool {
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if target.Host == "" {
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return false
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}
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ctx, cancel := context.WithTimeout(ctx, timeout)
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defer cancel()
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for _, port := range sshPortCandidates(target.Port, target.FallbackPorts) {
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probe := *target
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probe.Port = port
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dialer := net.Dialer{Timeout: minDuration(timeout, 2*time.Second)}
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conn, err := dialer.DialContext(ctx, "tcp", net.JoinHostPort(probe.Host, probe.Port))
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if err != nil {
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continue
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}
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_ = conn.Close()
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if runSSHQuietWithOptions(ctx, probe, sshReadyCommand(), "2", "1") == nil {
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target.Port = probe.Port
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return true
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}
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}
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return false
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}
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func sshReadyCommand() string {
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return "test -x /usr/local/bin/crabbox-ready && crabbox-ready >/tmp/crabbox-ready.log 2>&1"
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}
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func sshPortCandidates(port string, fallbackPorts []string) []string {
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if fallbackPorts == nil {
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fallbackPorts = []string{"22"}
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}
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return uniqueSSHPorts(append([]string{port}, fallbackPorts...))
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}
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func uniqueSSHPorts(ports []string) []string {
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seen := make(map[string]bool, len(ports))
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out := make([]string, 0, len(ports))
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for _, port := range ports {
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port = strings.TrimSpace(port)
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if port == "" || seen[port] {
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continue
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}
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seen[port] = true
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out = append(out, port)
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}
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return out
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}
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func runSSHQuiet(ctx context.Context, target SSHTarget, remote string) error {
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return runSSHQuietWithOptions(ctx, target, remote, "10", "3")
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}
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func runSSHQuietWithOptions(ctx context.Context, target SSHTarget, remote, connectTimeout, connectionAttempts string) error {
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cmd := exec.CommandContext(ctx, "ssh", sshArgsWithOptions(target, remote, connectTimeout, connectionAttempts)...)
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cmd.Stdout = io.Discard
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cmd.Stderr = io.Discard
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return cmd.Run()
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}
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func runSSHOutput(ctx context.Context, target SSHTarget, remote string) (string, error) {
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cmd := exec.CommandContext(ctx, "ssh", sshArgs(target, remote)...)
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out, err := cmd.Output()
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if err != nil {
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return "", err
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}
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return strings.TrimSpace(string(out)), nil
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}
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func runSSHCombinedOutput(ctx context.Context, target SSHTarget, remote string) (string, error) {
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cmd := exec.CommandContext(ctx, "ssh", sshArgs(target, remote)...)
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out, err := cmd.CombinedOutput()
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return strings.TrimSpace(string(out)), err
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}
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func runSSHInputQuiet(ctx context.Context, target SSHTarget, remote, input string) error {
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cmd := exec.CommandContext(ctx, "ssh", sshArgs(target, remote)...)
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cmd.Stdin = strings.NewReader(input)
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cmd.Stdout = io.Discard
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cmd.Stderr = io.Discard
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return cmd.Run()
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}
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func runSSHStream(ctx context.Context, target SSHTarget, remote string, stdout, stderr io.Writer) int {
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cmd := exec.CommandContext(ctx, "ssh", sshArgs(target, remote)...)
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cmd.Stdout = stdout
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cmd.Stderr = stderr
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err := cmd.Run()
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if err == nil {
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return 0
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}
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var exitErr *exec.ExitError
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if ok := asExitError(err, &exitErr); ok {
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if status, ok := exitErr.Sys().(syscall.WaitStatus); ok {
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return status.ExitStatus()
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}
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}
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return 7
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}
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func sshArgs(target SSHTarget, remote string) []string {
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return sshArgsWithOptions(target, remote, "10", "3")
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}
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func sshArgsWithOptions(target SSHTarget, remote, connectTimeout, connectionAttempts string) []string {
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return append(sshBaseArgsWithOptions(target, connectTimeout, connectionAttempts),
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target.User+"@"+target.Host,
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remote,
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)
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}
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func sshBaseArgs(target SSHTarget) []string {
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return sshBaseArgsWithOptions(target, "10", "3")
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}
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func sshBaseArgsWithOptions(target SSHTarget, connectTimeout, connectionAttempts string) []string {
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return []string{
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"-i", target.Key,
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"-o", "BatchMode=yes",
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"-o", "StrictHostKeyChecking=accept-new",
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"-o", "UserKnownHostsFile=" + sshConfigFileValue(knownHostsFile(target)),
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"-o", "ConnectTimeout=" + connectTimeout,
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"-o", "ConnectionAttempts=" + connectionAttempts,
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"-o", "ServerAliveInterval=15",
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"-o", "ServerAliveCountMax=2",
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"-o", "ControlMaster=auto",
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"-o", "ControlPersist=60s",
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"-o", "ControlPath=" + sshControlPath(target),
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"-p", target.Port,
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}
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}
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func minDuration(left, right time.Duration) time.Duration {
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if left < right {
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return left
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}
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return right
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}
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func knownHostsFile(target SSHTarget) string {
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if target.Key != "" {
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return filepath.Join(filepath.Dir(target.Key), "known_hosts")
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}
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return filepath.Join(os.Getenv("HOME"), ".ssh", "known_hosts")
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}
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func sshConfigFileValue(path string) string {
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if strings.ContainsAny(path, " \t\"'") {
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return strconv.Quote(path)
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}
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return path
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}
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func sshControlPath(target SSHTarget) string {
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scope := target.Key
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if scope == "" {
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scope = target.User
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}
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sum := sha1.Sum([]byte(scope))
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return filepath.Join("/tmp", "crabbox-ssh-"+hex.EncodeToString(sum[:4])+"-%C")
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}
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type rsyncOptions struct {
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Debug bool
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Delete bool
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Checksum bool
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UseFilesFrom bool
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FilesFrom []byte
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Timeout time.Duration
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HeartbeatInterval time.Duration
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}
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func rsync(ctx context.Context, target SSHTarget, src, dst string, excludes []string, stdout, stderr io.Writer, opts rsyncOptions) error {
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if opts.Timeout > 0 {
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var cancel context.CancelFunc
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ctx, cancel = context.WithTimeout(ctx, opts.Timeout)
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defer cancel()
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}
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args := []string{
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"-az",
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"-e", strings.Join(shellWords(append([]string{"ssh"}, sshBaseArgs(target)...)), " "),
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}
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if opts.Delete && !opts.UseFilesFrom {
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args = append(args, "--delete")
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}
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if opts.Checksum {
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args = append(args, "--checksum")
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}
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if opts.UseFilesFrom {
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args = append(args, "--files-from=-", "--from0")
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}
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for _, exclude := range excludes {
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args = append(args, "--exclude", exclude)
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}
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if opts.Debug {
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args = append(args, "--stats", "--itemize-changes", "--progress")
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}
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args = append(args, ensureTrailingSlash(src), target.User+"@"+target.Host+":"+dst+"/")
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start := time.Now()
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cmd := exec.CommandContext(ctx, "rsync", args...)
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if opts.UseFilesFrom {
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cmd.Stdin = bytes.NewReader(opts.FilesFrom)
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}
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cmd.Stdout = stdout
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cmd.Stderr = stderr
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stopHeartbeat := startSyncHeartbeat(stderr, start, opts.HeartbeatInterval)
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err := cmd.Run()
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stopHeartbeat()
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if ctx.Err() == context.DeadlineExceeded {
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return exit(6, "rsync timed out after %s", opts.Timeout)
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}
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if opts.Debug {
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fmt.Fprintf(stderr, "rsync elapsed=%s checksum=%t delete=%t\n", time.Since(start).Round(time.Millisecond), opts.Checksum, opts.Delete)
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}
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return err
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}
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func startSyncHeartbeat(stderr io.Writer, start time.Time, interval time.Duration) func() {
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if interval <= 0 {
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return func() {}
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}
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done := make(chan struct{})
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go func() {
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ticker := time.NewTicker(interval)
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defer ticker.Stop()
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for {
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select {
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case <-done:
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return
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case <-ticker.C:
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fmt.Fprintf(stderr, "still syncing after %s...\n", time.Since(start).Round(time.Second))
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}
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}
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}()
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return func() { close(done) }
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}
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func ensureTrailingSlash(path string) string {
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if strings.HasSuffix(path, "/") {
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return path
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}
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return path + "/"
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}
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func shellQuote(s string) string {
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return "'" + strings.ReplaceAll(s, "'", "'\\''") + "'"
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}
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func remoteCommand(workdir string, env map[string]string, command []string) string {
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return remoteCommandWithEnvFile(workdir, env, "", command)
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}
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func remoteCommandWithEnvFile(workdir string, env map[string]string, envFile string, command []string) string {
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var b strings.Builder
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writeRemoteCommandPrefix(&b, workdir, env, envFile)
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b.WriteString("bash -lc ")
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b.WriteString(shellQuote(`exec "$@"`))
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b.WriteString(" bash")
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for _, word := range command {
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b.WriteByte(' ')
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b.WriteString(shellQuote(word))
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}
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return b.String()
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}
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func remoteShellCommand(workdir string, env map[string]string, script string) string {
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return remoteShellCommandWithEnvFile(workdir, env, "", script)
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}
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func remoteShellCommandWithEnvFile(workdir string, env map[string]string, envFile, script string) string {
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var b strings.Builder
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writeRemoteCommandPrefix(&b, workdir, env, envFile)
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b.WriteString("bash -lc ")
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b.WriteString(shellQuote(script))
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return b.String()
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}
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func writeRemoteCommandPrefix(b *strings.Builder, workdir string, env map[string]string, envFile string) {
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b.WriteString("cd ")
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b.WriteString(shellQuote(workdir))
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b.WriteString(" && ")
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if envFile != "" {
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b.WriteString("if [ -f ")
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b.WriteString(shellQuote(envFile))
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b.WriteString(" ]; then . ")
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b.WriteString(shellQuote(envFile))
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b.WriteString("; fi && ")
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}
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for k, v := range env {
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b.WriteString(k)
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b.WriteByte('=')
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b.WriteString(shellQuote(v))
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b.WriteByte(' ')
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}
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}
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func shellWords(words []string) []string {
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out := make([]string, 0, len(words))
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for _, w := range words {
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out = append(out, shellQuote(w))
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}
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return out
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}
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func remoteMkdir(workdir string) string {
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return "mkdir -p " + shellQuote(workdir)
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}
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func remoteGitHydrate(workdir, baseRef string) string {
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if baseRef == "" {
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return "true"
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}
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refspec := "+refs/heads/" + baseRef + ":refs/remotes/origin/" + baseRef
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return "cd " + shellQuote(workdir) + " && " +
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"if git rev-parse --is-inside-work-tree >/dev/null 2>&1 && git remote get-url origin >/dev/null 2>&1; then " +
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"git fetch --quiet --unshallow origin " + shellQuote(refspec) + " || git fetch --quiet --depth=1000 origin " + shellQuote(refspec) + " || git fetch --quiet origin " + shellQuote(refspec) + " || git fetch --quiet origin " + shellQuote(baseRef) + " || true; " +
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"fi"
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}
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func remoteGitHydrateStatus(workdir, baseRef, expectedSHA string) string {
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if baseRef == "" || expectedSHA == "" {
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return "printf ''"
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}
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script := `cd ` + shellQuote(workdir) + ` && ` + remoteSyncMetaDirScript() + `
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if ! git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
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exit 0
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fi
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marker="$meta_dir/git-hydrate-base"
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remote_sha="$(git rev-parse --verify ` + shellQuote("refs/remotes/origin/"+baseRef+"^{commit}") + ` 2>/dev/null || git rev-parse --verify ` + shellQuote("origin/"+baseRef+"^{commit}") + ` 2>/dev/null || true)"
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if [ "$remote_sha" = ` + shellQuote(expectedSHA) + ` ]; then
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if [ -f "$marker" ] && grep -qx ` + shellQuote(baseRef+" "+expectedSHA) + ` "$marker"; then
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printf 'marker base current'
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exit 0
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fi
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printf 'remote base current'
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exit 0
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fi
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if [ -n "$remote_sha" ] && git merge-base --is-ancestor ` + shellQuote(expectedSHA) + ` "$remote_sha" >/dev/null 2>&1; then
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printf 'remote base contains local'
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fi`
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return "bash -lc " + shellQuote(script)
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}
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func remoteWriteGitHydrateMarker(workdir, baseRef, expectedSHA string) string {
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if baseRef == "" || expectedSHA == "" {
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return "true"
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}
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script := "cd " + shellQuote(workdir) + " && " + remoteSyncMetaDirScript() + "mkdir -p \"$meta_dir\" && printf %s " + shellQuote(baseRef+" "+expectedSHA+"\n") + " > \"$meta_dir/git-hydrate-base\""
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return "bash -lc " + shellQuote(script)
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}
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func remoteGitSeed(workdir, remoteURL, head string) string {
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remoteURL = normalizeGitRemoteURL(remoteURL)
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if remoteURL == "" || head == "" {
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return "true"
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}
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parent := filepath.ToSlash(filepath.Dir(workdir))
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return "if [ ! -d " + shellQuote(workdir+"/.git") + " ]; then " +
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"mkdir -p " + shellQuote(parent) + "; " +
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"tmp=$(mktemp -d " + shellQuote(parent+"/.seed.XXXXXX") + "); " +
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"if git clone --quiet --filter=blob:none --no-checkout " + shellQuote(remoteURL) + " \"$tmp\" >/dev/null 2>&1; then " +
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"(cd \"$tmp\" && (git fetch --quiet --depth=1 origin " + shellQuote(head) + " || true) && (git checkout --quiet " + shellQuote(head) + " || git checkout --quiet FETCH_HEAD || true)); " +
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"rm -rf " + shellQuote(workdir) + " && mv \"$tmp\" " + shellQuote(workdir) + "; " +
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"else rm -rf \"$tmp\"; fi; " +
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"fi"
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}
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func normalizeGitRemoteURL(remoteURL string) string {
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if strings.HasPrefix(remoteURL, "git@github.com:") {
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return "https://github.com/" + strings.TrimSuffix(strings.TrimPrefix(remoteURL, "git@github.com:"), ".git") + ".git"
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}
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return remoteURL
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}
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func remoteReadSyncFingerprint(workdir string) string {
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script := "cd " + shellQuote(workdir) + " && " + remoteSyncMetaDirScript() + "cat \"$meta_dir/sync-fingerprint\" 2>/dev/null || true"
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return "bash -lc " + shellQuote(script)
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}
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func remoteWriteSyncFingerprint(workdir, fingerprint string) string {
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script := "cd " + shellQuote(workdir) + " && " + remoteSyncMetaDirScript() + "mkdir -p \"$meta_dir\" && printf %s " + shellQuote(fingerprint) + " > \"$meta_dir/sync-fingerprint\""
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return "bash -lc " + shellQuote(script)
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}
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func remoteWriteSyncManifestNew(workdir string) string {
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script := "cd " + shellQuote(workdir) + " && " + remoteSyncMetaDirScript() + "mkdir -p \"$meta_dir\" && cat > \"$meta_dir/sync-manifest.new\""
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return "bash -lc " + shellQuote(script)
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}
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|
func remoteWriteSyncDeletedNew(workdir string) string {
|
|
script := "cd " + shellQuote(workdir) + " && " + remoteSyncMetaDirScript() + "mkdir -p \"$meta_dir\" && cat > \"$meta_dir/sync-deleted.new\""
|
|
return "bash -lc " + shellQuote(script)
|
|
}
|
|
|
|
func remotePruneSyncManifest(workdir string) string {
|
|
script := "set -e\ncd " + shellQuote(workdir) + `
|
|
` + remoteSyncMetaDirScript() + `
|
|
old="$meta_dir/sync-manifest"
|
|
new="$meta_dir/sync-manifest.new"
|
|
deleted="$meta_dir/sync-deleted.new"
|
|
delete_paths() {
|
|
while IFS= read -r -d '' rel; do
|
|
case "$rel" in ''|/*|../*|*/../*) continue ;; esac
|
|
rm -f -- "$rel"
|
|
dir=$(dirname -- "$rel")
|
|
while [ "$dir" != . ] && [ "$dir" != / ]; do
|
|
rmdir -- "$dir" 2>/dev/null || break
|
|
dir=$(dirname -- "$dir")
|
|
done
|
|
done
|
|
}
|
|
manifest_removed_paths() {
|
|
python3 - "$old" "$new" <<'PY'
|
|
import pathlib
|
|
import sys
|
|
|
|
def read_manifest(path):
|
|
try:
|
|
data = pathlib.Path(path).read_bytes()
|
|
except FileNotFoundError:
|
|
return []
|
|
return [entry for entry in data.split(b"\0") if entry]
|
|
|
|
old = read_manifest(sys.argv[1])
|
|
new = set(read_manifest(sys.argv[2]))
|
|
sys.stdout.buffer.write(b"".join(entry + b"\0" for entry in old if entry not in new))
|
|
PY
|
|
}
|
|
if [ -f "$deleted" ]; then delete_paths < "$deleted"; fi
|
|
if [ -f "$old" ] && [ -f "$new" ]; then manifest_removed_paths | delete_paths; fi
|
|
`
|
|
return "bash -lc " + shellQuote(script)
|
|
}
|
|
|
|
func remoteApplySyncManifest(workdir string) string {
|
|
script := "set -e; cd " + shellQuote(workdir) + "; " + remoteSyncMetaDirScript() + "mkdir -p \"$meta_dir\"; new=\"$meta_dir/sync-manifest.new\"; deleted=\"$meta_dir/sync-deleted.new\"; rm -f \"$deleted\"; mv \"$new\" \"$meta_dir/sync-manifest\""
|
|
return "bash -lc " + shellQuote(script)
|
|
}
|
|
|
|
func remoteSyncMetaDirScript() string {
|
|
return "meta_dir=$(if [ -d .git ]; then printf %s .git/crabbox; else printf %s .crabbox; fi); "
|
|
}
|
|
|
|
func remoteSyncSanity(workdir string, allowMassDeletions bool) string {
|
|
allowValue := ""
|
|
if allowMassDeletions {
|
|
allowValue = "1"
|
|
}
|
|
return "cd " + shellQuote(workdir) + " && " +
|
|
"if test -d .git && git status --short >/tmp/crabbox-git-status 2>/dev/null; then " +
|
|
"deletions=$(awk '/^ D|^D / { n++ } END { print n+0 }' /tmp/crabbox-git-status); " +
|
|
"if [ " + shellQuote(allowValue) + " != '1' ] && [ \"$deletions\" -ge 200 ]; then " +
|
|
"echo \"remote sync sanity failed: $deletions tracked deletions\" >&2; " +
|
|
"awk '/^ D|^D / { print \" \" substr($0,4) }' /tmp/crabbox-git-status | head -20 >&2; " +
|
|
"exit 66; " +
|
|
"fi; " +
|
|
"fi"
|
|
}
|
|
|
|
func exitCode(err error) int {
|
|
if err == nil {
|
|
return 0
|
|
}
|
|
var exitErr *exec.ExitError
|
|
if asExitError(err, &exitErr) {
|
|
if status, ok := exitErr.Sys().(syscall.WaitStatus); ok {
|
|
return status.ExitStatus()
|
|
}
|
|
}
|
|
return 1
|
|
}
|
|
|
|
func parseServerID(s string) (int64, bool) {
|
|
id, err := strconv.ParseInt(s, 10, 64)
|
|
return id, err == nil
|
|
}
|