main.c

/* Copyright 2012-present Facebook, Inc.
 * Licensed under the Apache License, Version 2.0 */
#include "watchman.h"
#ifndef _WIN32
#include <poll.h>
#endif

static int show_help = 0;
static int show_version = 0;
static enum w_pdu_type server_pdu = is_bser;
static enum w_pdu_type output_pdu = is_json_pretty;
static char *server_encoding = NULL;
static char *output_encoding = NULL;
static char *sock_name = NULL;
char *log_name = NULL;
#ifdef USE_GIMLI
static char *pid_file = NULL;
#endif
char *watchman_state_file = NULL;
static char **daemon_argv = NULL;
const char *watchman_tmp_dir = NULL;
static int persistent = 0;
int dont_save_state = 0;
static int foreground = 0;
static int no_pretty = 0;
static int no_spawn = 0;
static int no_local = 0;
#ifndef _WIN32
static struct sockaddr_un un;
#endif
static int json_input_arg = 0;

#ifdef __APPLE__
#include <mach-o/dyld.h>
#endif

#if defined(USE_GIMLI) || defined(__APPLE__) || defined(_WIN32)
# define SPAWN_VIA_LAUNCHER 1
#endif

static void run_service(void)
{
  int fd;
  bool res;

  // redirect std{in,out,err}
  fd = open("/dev/null", O_RDONLY);
  if (fd != -1) {
    ignore_result(dup2(fd, STDIN_FILENO));
    close(fd);
  }
  fd = open(log_name, O_WRONLY|O_APPEND|O_CREAT, 0600);
  if (fd != -1) {
    ignore_result(dup2(fd, STDOUT_FILENO));
    ignore_result(dup2(fd, STDERR_FILENO));
    close(fd);
  }

#ifndef _WIN32
  /* we are the child, let's set things up */
  ignore_result(chdir("/"));
#endif

  w_set_thread_name("listener");
  {
    char hostname[256];
    gethostname(hostname, sizeof(hostname));
    hostname[sizeof(hostname) - 1] = '\0';
    w_log(W_LOG_ERR, "Watchman %s %s starting up on %s\n",
        PACKAGE_VERSION,
#ifdef WATCHMAN_BUILD_INFO
        WATCHMAN_BUILD_INFO,
#else
        "<no build info set>",
#endif
        hostname);
  }

  watchman_watcher_init();
  w_clockspec_init();
  w_state_load();
  w_start_reaper();
  res = w_start_listener(sock_name);
  w_root_free_watched_roots();

  if (res) {
    exit(0);
  }
  exit(1);
}

#ifndef _WIN32
// close any random descriptors that we may have inherited,
// leaving only the main stdio descriptors open, if we execute a
// child process.
static void close_random_fds(void) {
  struct rlimit limit;
  long open_max = 0;
  int max_fd;

  // Deduce the upper bound for number of descriptors
  limit.rlim_cur = 0;
#ifdef RLIMIT_NOFILE
  if (getrlimit(RLIMIT_NOFILE, &limit) != 0) {
    limit.rlim_cur = 0;
  }
#elif defined(RLIM_OFILE)
  if (getrlimit(RLIMIT_OFILE, &limit) != 0) {
    limit.rlim_cur = 0;
  }
#endif
#ifdef _SC_OPEN_MAX
  open_max = sysconf(_SC_OPEN_MAX);
#endif
  if (open_max <= 0) {
    open_max = 36; /* POSIX_OPEN_MAX (20) + some padding */
  }
  if (limit.rlim_cur == RLIM_INFINITY || limit.rlim_cur > INT_MAX) {
    // "no limit", which seems unlikely
    limit.rlim_cur = INT_MAX;
  }
  // Take the larger of the two values we compute
  if (limit.rlim_cur > (rlim_t)open_max) {
    open_max = limit.rlim_cur;
  }

  for (max_fd = open_max; max_fd > STDERR_FILENO; --max_fd) {
    close(max_fd);
  }
}
#endif

#if !defined(USE_GIMLI) && !defined(_WIN32)
static void daemonize(void)
{
  close_random_fds();

  // the double-fork-and-setsid trick establishes a
  // child process that runs in its own process group
  // with its own session and that won't get killed
  // off when your shell exits (for example).
  if (fork()) {
    // The parent of the first fork is the client
    // process that is being run by the user, and
    // we want to allow that to continue.
    return;
  }
  setsid();
  if (fork()) {
    // The parent of the second fork has served its
    // purpose, so we simply exit here, otherwise
    // we'll duplicate the effort of either the
    // client or the server depending on if we
    // return or not.
    _exit(0);
  }

  // we are the child, let's set things up
  run_service();
}
#endif

#ifdef SPAWN_VIA_LAUNCHER
#define MAX_DAEMON_ARGS 64
static void append_argv(char **argv, char *item)
{
  int i;

  for (i = 0; argv[i]; i++) {
    ;
  }
  if (i + 1 >= MAX_DAEMON_ARGS) {
    abort();
  }

  argv[i] = item;
  argv[i+1] = NULL;
}

#ifdef _WIN32
static void spawn_win32(void) {
  char module_name[WATCHMAN_NAME_MAX];
  GetModuleFileName(NULL, module_name, sizeof(module_name));
  char *argv[MAX_DAEMON_ARGS] = {
    module_name,
    "--foreground",
    NULL
  };
  posix_spawn_file_actions_t actions;
  posix_spawnattr_t attr;
  pid_t pid;
  int i;

  for (i = 0; daemon_argv[i]; i++) {
    append_argv(argv, daemon_argv[i]);
  }

  posix_spawnattr_init(&attr);
  posix_spawnattr_setflags(&attr, POSIX_SPAWN_SETPGROUP);
  posix_spawn_file_actions_init(&actions);
  posix_spawn_file_actions_addopen(&actions,
      STDIN_FILENO, "/dev/null", O_RDONLY, 0);
  posix_spawn_file_actions_addopen(&actions,
      STDOUT_FILENO, log_name, O_WRONLY|O_CREAT|O_APPEND, 0600);
  posix_spawn_file_actions_adddup2(&actions,
      STDOUT_FILENO, STDERR_FILENO);
  posix_spawnp(&pid, argv[0], &actions, &attr, argv, environ);
  posix_spawnattr_destroy(&attr);
  posix_spawn_file_actions_destroy(&actions);
}
#endif

#ifdef USE_GIMLI
static void spawn_via_gimli(void)
{
  char *argv[MAX_DAEMON_ARGS] = {
    GIMLI_MONITOR_PATH,
#ifdef WATCHMAN_STATE_DIR
    "--trace-dir=" WATCHMAN_STATE_DIR "/traces",
#endif
    "--pidfile", pid_file,
    "watchman",
    "--foreground",
    NULL
  };
  posix_spawn_file_actions_t actions;
  posix_spawnattr_t attr;
  pid_t pid;
  int i;

  for (i = 0; daemon_argv[i]; i++) {
    append_argv(argv, daemon_argv[i]);
  }

  close_random_fds();

  posix_spawnattr_init(&attr);
  posix_spawn_file_actions_init(&actions);
  posix_spawn_file_actions_addopen(&actions,
      STDOUT_FILENO, log_name, O_WRONLY|O_CREAT|O_APPEND, 0600);
  posix_spawn_file_actions_adddup2(&actions,
      STDOUT_FILENO, STDERR_FILENO);
  posix_spawnp(&pid, argv[0], &actions, &attr, argv, environ);
  posix_spawnattr_destroy(&attr);
  posix_spawn_file_actions_destroy(&actions);
}
#endif

#ifdef __APPLE__
static void spawn_via_launchd(void)
{
  char watchman_path[WATCHMAN_NAME_MAX];
  uint32_t size = sizeof(watchman_path);
  char plist_path[WATCHMAN_NAME_MAX];
  FILE *fp;
  struct passwd *pw;
  uid_t uid;
  char *argv[MAX_DAEMON_ARGS] = {
    "/bin/launchctl",
    "load",
    "-F",
    NULL
  };
  posix_spawnattr_t attr;
  pid_t pid;
  int res;

  close_random_fds();

  if (_NSGetExecutablePath(watchman_path, &size) == -1) {
    w_log(W_LOG_ERR, "_NSGetExecutablePath: path too long; size %u\n", size);
    abort();
  }

  uid = getuid();
  pw = getpwuid(uid);
  if (!pw) {
    w_log(W_LOG_ERR, "getpwuid(%d) failed: %s.  I don't know who you are\n",
        uid, strerror(errno));
    abort();
  }

  snprintf(plist_path, sizeof(plist_path),
      "%s/Library/LaunchAgents", pw->pw_dir);
  // Best effort attempt to ensure that the agents dir exists.  We'll detect
  // and report the failure in the fopen call below.
  mkdir(plist_path, 0755);
  snprintf(plist_path, sizeof(plist_path),
      "%s/Library/LaunchAgents/com.github.facebook.watchman.plist", pw->pw_dir);

  if (access(plist_path, R_OK) == 0) {
    // Unload any that may already exist, as it is likely wrong
    char *unload_argv[MAX_DAEMON_ARGS] = {
      "/bin/launchctl",
      "unload",
      NULL
    };
    append_argv(unload_argv, plist_path);

    errno = posix_spawnattr_init(&attr);
    if (errno != 0) {
      w_log(W_LOG_FATAL, "posix_spawnattr_init: %s\n", strerror(errno));
    }

    res = posix_spawnp(&pid, unload_argv[0], NULL, &attr, unload_argv, environ);
    if (res == 0) {
      waitpid(pid, &res, 0);
    }
    posix_spawnattr_destroy(&attr);

    // Forcibly remove the plist.  In some cases it may have some attributes
    // set that prevent launchd from loading it.  This can happen where
    // the system was re-imaged or restored from a backup
    unlink(plist_path);
  }

  fp = fopen(plist_path, "w");
  if (!fp) {
    w_log(W_LOG_ERR, "Failed to open %s for write: %s\n",
        plist_path, strerror(errno));
    abort();
  }

  fprintf(fp,
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
"<!DOCTYPE plist PUBLIC \"-//Apple//DTD PLIST 1.0//EN\" "
"\"http://www.apple.com/DTDs/PropertyList-1.0.dtd\">\n"
"<plist version=\"1.0\">\n"
"<dict>\n"
"    <key>Label</key>\n"
"    <string>com.github.facebook.watchman</string>\n"
"    <key>Disabled</key>\n"
"    <false/>\n"
"    <key>ProgramArguments</key>\n"
"    <array>\n"
"        <string>%s</string>\n"
"        <string>--foreground</string>\n"
"        <string>--logfile=%s</string>\n"
"        <string>--log-level=%d</string>\n"
"        <string>--sockname=%s</string>\n"
"        <string>--statefile=%s</string>\n"
"    </array>\n"
"    <key>Sockets</key>\n"
"    <dict>\n"
"        <key>sock</key>\n" // coupled with get_listener_socket_from_launchd
"        <dict>\n"
"            <key>SockPathName</key>\n"
"            <string>%s</string>\n"
"            <key>SockPathMode</key>\n"
"            <integer>%d</integer>\n"
"        </dict>\n"
"    </dict>\n"
"    <key>KeepAlive</key>\n"
"    <dict>\n"
"        <key>Crashed</key>\n"
"        <true/>\n"
"    </dict>\n"
"    <key>RunAtLoad</key>\n"
"    <true/>\n"
"    <key>EnvironmentVariables</key>\n"
"    <dict>\n"
"        <key>PATH</key>\n"
"        <string><![CDATA[%s]]></string>\n"
"    </dict>\n"
"    <key>ProcessType</key>\n"
"    <string>Interactive</string>\n"
"    <key>Nice</key>\n"
"    <integer>-5</integer>\n"
"</dict>\n"
"</plist>\n",
    watchman_path, log_name, log_level, sock_name,
    watchman_state_file, sock_name, 0600,
    getenv("PATH"));
  fclose(fp);
  // Don't rely on umask, ensure we have the correct perms
  chmod(plist_path, 0644);

  append_argv(argv, plist_path);

  errno = posix_spawnattr_init(&attr);
  if (errno != 0) {
    w_log(W_LOG_FATAL, "posix_spawnattr_init: %s\n", strerror(errno));
  }

  res = posix_spawnp(&pid, argv[0], NULL, &attr, argv, environ);
  if (res) {
    w_log(W_LOG_FATAL, "Failed to spawn watchman via launchd: %s\n",
        strerror(errno));
  }
  posix_spawnattr_destroy(&attr);

  if (waitpid(pid, &res, 0) == -1) {
    w_log(W_LOG_FATAL, "Failed waiting for launchctl load: %s\n",
        strerror(errno));
  }

  if (WIFEXITED(res) && WEXITSTATUS(res) == 0) {
    return;
  }

  // Most likely cause is "headless" operation with no GUI context
  if (WIFEXITED(res)) {
    w_log(W_LOG_ERR, "launchctl: exited with status %d\n", WEXITSTATUS(res));
  } else if (WIFSIGNALED(res)) {
    w_log(W_LOG_ERR, "launchctl: signalled with %d\n", WTERMSIG(res));
  }
  w_log(W_LOG_ERR, "Falling back to daemonize\n");
  daemonize();
}
#endif

#endif // SPAWN_VIA_LAUNCHER

static void parse_encoding(const char *enc, enum w_pdu_type *pdu)
{
  if (!enc) {
    return;
  }
  if (!strcmp(enc, "json")) {
    *pdu = is_json_compact;
    return;
  }
  if (!strcmp(enc, "bser")) {
    *pdu = is_bser;
    return;
  }
  w_log(W_LOG_ERR, "Invalid encoding '%s', use one of json or bser\n", enc);
  exit(EX_USAGE);
}

static const char *get_env_with_fallback(const char *name1,
    const char *name2, const char *fallback)
{
  const char *val;

  val = getenv(name1);
  if (!val || *val == 0) {
    val = getenv(name2);
  }
  if (!val || *val == 0) {
    val = fallback;
  }

  return val;
}

static void compute_file_name(char **strp,
    const char *user,
    const char *suffix,
    const char *what)
{
  char *str = NULL;

  str = *strp;

  if (!str) {
    /* We'll put our various artifacts in a user specific dir
     * within the state dir location */
    char *state_dir = NULL;
    const char *state_parent =
#ifdef WATCHMAN_STATE_DIR
          WATCHMAN_STATE_DIR
#else
          watchman_tmp_dir
#endif
          ;

    ignore_result(asprintf(&state_dir, "%s%c%s-state",
          state_parent,
          WATCHMAN_DIR_SEP,
          user));

    if (!state_dir) {
      w_log(W_LOG_ERR, "out of memory computing %s\n", what);
      exit(1);
    }

    if (mkdir(state_dir, 0700) == 0 || errno == EEXIST) {
#ifndef _WIN32
      // verify ownership
      struct stat st;
      uid_t euid = geteuid();

      if (stat(state_dir, &st) != 0) {
        w_log(W_LOG_ERR, "stat(%s): %s\n", state_dir, strerror(errno));
        exit(1);
      }
      if (euid != st.st_uid) {
        w_log(W_LOG_ERR,
            "the owner of %s is uid %d and doesn't match your euid %d\n",
            state_dir, st.st_uid, euid);
        exit(1);
      }
      if (st.st_mode & 0022) {
        w_log(W_LOG_ERR,
            "the permissions on %s allow others to write to it. "
            "Verify that you own the contents and then fix its "
            "permissions by running `chmod 0700 %s`\n",
            state_dir,
            state_dir);
        exit(1);
      }
#endif
    } else {
      w_log(W_LOG_ERR, "failed to create %s: %s\n",
          state_dir, strerror(errno));
      exit(1);
    }

    ignore_result(asprintf(&str, "%s%c%s",
          state_dir, WATCHMAN_DIR_SEP, suffix));

    if (!str) {
      w_log(W_LOG_ERR, "out of memory computing %s", what);
      abort();
    }

    free(state_dir);
  }

#ifndef _WIN32
  if (str[0] != '/') {
    w_log(W_LOG_ERR, "invalid %s: %s", what, str);
    abort();
  }
#endif

  *strp = str;
}

static void setup_sock_name(void)
{
  const char *user = get_env_with_fallback("USER", "LOGNAME", NULL);
#ifdef _WIN32
  char user_buf[256];
#endif

  watchman_tmp_dir = get_env_with_fallback("TMPDIR", "TMP", "/tmp");

  if (!user) {
#ifdef _WIN32
    DWORD size = sizeof(user_buf);
    if (GetUserName(user_buf, &size)) {
      user_buf[size] = 0;
      user = user_buf;
    } else {
      w_log(W_LOG_FATAL, "GetUserName failed: %s. I don't know who you are\n",
          win32_strerror(GetLastError()));
    }
#else
    uid_t uid = getuid();
    struct passwd *pw;

    pw = getpwuid(uid);
    if (!pw) {
      w_log(W_LOG_FATAL, "getpwuid(%d) failed: %s. I don't know who you are\n",
          uid, strerror(errno));
    }

    user = pw->pw_name;
#endif

    if (!user) {
      w_log(W_LOG_ERR, "watchman requires that you set $USER in your env\n");
      abort();
    }
  }

#ifdef _WIN32
  if (!sock_name) {
    asprintf(&sock_name, "\\\\.\\pipe\\watchman-%s", user);
  }
#else
  compute_file_name(&sock_name, user, "sock", "sockname");
#endif
  compute_file_name(&watchman_state_file, user, "state", "statefile");
  compute_file_name(&log_name, user, "log", "logname");
#ifdef USE_GIMLI
  compute_file_name(&pid_file, user, "pid", "pidfile");
#endif

#ifndef _WIN32
  un.sun_family = PF_LOCAL;
  strcpy(un.sun_path, sock_name);

  if (strlen(sock_name) >= sizeof(un.sun_path) - 1) {
    w_log(W_LOG_ERR, "%s: path is too long\n",
        sock_name);
    abort();
  }
#endif
}

static bool should_start(int err)
{
  if (err == ECONNREFUSED) {
    return true;
  }
  if (err == ENOENT) {
    return true;
  }
  return false;
}

static bool try_command(json_t *cmd, int timeout)
{
  w_stm_t client = NULL;
  w_jbuffer_t buffer;
  w_jbuffer_t output_pdu_buffer;
  int err;

  client = w_stm_connect(sock_name, timeout * 1000);
  if (client == NULL) {
    return false;
  }

  if (!cmd) {
    w_stm_close(client);
    return true;
  }

  w_json_buffer_init(&buffer);

  // Send command
  if (!w_ser_write_pdu(server_pdu, &buffer, client, cmd)) {
    err = errno;
    w_log(W_LOG_ERR, "error sending PDU to server\n");
    w_json_buffer_free(&buffer);
    w_stm_close(client);
    errno = err;
    return false;
  }

  w_json_buffer_reset(&buffer);

  w_json_buffer_init(&output_pdu_buffer);

  do {
    if (!w_json_buffer_passthru(
          &buffer, output_pdu, &output_pdu_buffer, client)) {
      err = errno;
      w_json_buffer_free(&buffer);
      w_json_buffer_free(&output_pdu_buffer);
      w_stm_close(client);
      errno = err;
      return false;
    }
  } while (persistent);
  w_json_buffer_free(&buffer);
  w_json_buffer_free(&output_pdu_buffer);
  w_stm_close(client);

  return true;
}

static struct watchman_getopt opts[] = {
  { "help",     'h', "Show this help",
    OPT_NONE,   &show_help, NULL, NOT_DAEMON },
  { "version",  'v', "Show version number",
    OPT_NONE,   &show_version, NULL, NOT_DAEMON },
  { "sockname", 'U', "Specify alternate sockname",
    REQ_STRING, &sock_name, "PATH", IS_DAEMON },
  { "logfile", 'o', "Specify path to logfile",
    REQ_STRING, &log_name, "PATH", IS_DAEMON },
  { "log-level", 0, "set the log level (0 = off, default is 1, verbose = 2)",
    REQ_INT, &log_level, NULL, IS_DAEMON },
#ifdef USE_GIMLI
  { "pidfile", 0, "Specify path to gimli monitor pidfile",
    REQ_STRING, &pid_file, "PATH", NOT_DAEMON },
#endif
  { "persistent", 'p', "Persist and wait for further responses",
    OPT_NONE, &persistent, NULL, NOT_DAEMON },
  { "no-save-state", 'n', "Don't save state between invocations",
    OPT_NONE, &dont_save_state, NULL, IS_DAEMON },
  { "statefile", 0, "Specify path to file to hold watch and trigger state",
    REQ_STRING, &watchman_state_file, "PATH", IS_DAEMON },
  { "json-command", 'j', "Instead of parsing CLI arguments, take a single "
    "json object from stdin",
    OPT_NONE, &json_input_arg, NULL, NOT_DAEMON },
  { "output-encoding", 0, "CLI output encoding. json (default) or bser",
    REQ_STRING, &output_encoding, NULL, NOT_DAEMON },
  { "server-encoding", 0, "CLI<->server encoding. bser (default) or json",
    REQ_STRING, &server_encoding, NULL, NOT_DAEMON },
  { "foreground", 'f', "Run the service in the foreground",
    OPT_NONE, &foreground, NULL, NOT_DAEMON },
  { "no-pretty", 0, "Don't pretty print JSON",
    OPT_NONE, &no_pretty, NULL, NOT_DAEMON },
  { "no-spawn", 0, "Don't try to start the service if it is not available",
    OPT_NONE, &no_spawn, NULL, NOT_DAEMON },
  { "no-local", 0, "When no-spawn is enabled, don't try to handle request"
    " in client mode if service is unavailable",
    OPT_NONE, &no_local, NULL, NOT_DAEMON },
  { 0, 0, 0, 0, 0, 0, 0 }
};

static void parse_cmdline(int *argcp, char ***argvp)
{
  cfg_load_global_config_file();
  w_getopt(opts, argcp, argvp, &daemon_argv);
  if (show_help) {
    usage(opts, stdout);
  }
  if (show_version) {
    printf("%s\n", PACKAGE_VERSION);
    exit(0);
  }
  setup_sock_name();
  parse_encoding(server_encoding, &server_pdu);
  parse_encoding(output_encoding, &output_pdu);
  if (!output_encoding) {
    output_pdu = no_pretty ? is_json_compact : is_json_pretty;
  }
}

static json_t *build_command(int argc, char **argv)
{
  json_t *cmd;
  int i;

  // Read blob from stdin
  if (json_input_arg) {
    json_error_t err;
    w_jbuffer_t buf;

    memset(&err, 0, sizeof(err));
    w_json_buffer_init(&buf);
    cmd = w_json_buffer_next(&buf, w_stm_stdin(), &err);

    if (buf.pdu_type == is_bser) {
      // If they used bser for the input, select bser for output
      // unless they explicitly requested something else
      if (!server_encoding) {
        server_pdu = is_bser;
      }
      if (!output_encoding) {
        output_pdu = is_bser;
      }
    }

    w_json_buffer_free(&buf);

    if (cmd == NULL) {
      fprintf(stderr, "failed to parse command from stdin: %s\n",
          err.text);
      exit(1);
    }
    return cmd;
  }

  // Special case: no arguments means that we just want
  // to verify that the service is up, starting it if
  // needed
  if (argc == 0) {
    return NULL;
  }

  cmd = json_array();
  for (i = 0; i < argc; i++) {
    json_array_append_new(cmd, json_string(argv[i]));
  }

  return cmd;
}

const char *get_sock_name(void)
{
  return sock_name;
}

int main(int argc, char **argv)
{
  bool ran;
  json_t *cmd;

  w_client_lock_init();
  parse_cmdline(&argc, &argv);

  if (foreground) {
    run_service();
    return 0;
  }

  w_set_thread_name("cli");
  cmd = build_command(argc, argv);
  preprocess_command(cmd, output_pdu);

  ran = try_command(cmd, 0);
  if (!ran && should_start(errno)) {
    if (no_spawn) {
      if (!no_local) {
        ran = try_client_mode_command(cmd, !no_pretty);
      }
    } else {
#ifdef USE_GIMLI
      spawn_via_gimli();
#elif defined(__APPLE__)
      spawn_via_launchd();
#elif defined(_WIN32)
      spawn_win32();
#else
      daemonize();
#endif
      ran = try_command(cmd, 10);
    }
  }

  json_decref(cmd);

  if (ran) {
    return 0;
  }

  if (!no_spawn) {
    w_log(W_LOG_ERR, "unable to talk to your watchman on %s! (%s)\n",
        sock_name, strerror(errno));
#ifdef __APPLE__
    if (getenv("TMUX")) {
      w_log(W_LOG_ERR, "\n"
"You may be hitting a tmux related session issue.\n"
"An immediate workaround is to run:\n"
"\n"
"    watchman version\n"
"\n"
"just once, from *outside* your tmux session, to allow the launchd\n"
"registration to be setup.  Once done, you can continue to access\n"
"watchman from inside your tmux sessions as usual.\n"
"\n"
"Longer term, you may wish to install this tool:\n"
"\n"
"    https://github.com/ChrisJohnsen/tmux-MacOSX-pasteboard\n"
"\n"
"and configure tmux to use `reattach-to-user-namespace`\n"
"when it launches your shell.\n");
    }
#endif
  }
  return 1;
}

/* vim:ts=2:sw=2:et:
 */