/* Test of posix_spawn() function.
   Copyright (C) 2020-2021 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, see <https://www.gnu.org/licenses/>.  */

#include <config.h>

#include <spawn.h>

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>

#include "macros.h"

#define DATA_FILENAME "test-posix_spawn-script.tmp"

int
main ()
{
  unlink (DATA_FILENAME);

  /* Check an invocation of an executable script.
     This should only be supported if the script has a '#!' marker; otherwise
     it is unsecure: <https://sourceware.org/bugzilla/show_bug.cgi?id=13134>.
     POSIX says that the execlp() and execvp() functions support executing
     shell scripts
     <https://pubs.opengroup.org/onlinepubs/9699919799/functions/exec.html>,
     but this is considered an antiquated feature.  */
  pid_t child;

  posix_spawn_file_actions_t actions;
  ASSERT (posix_spawn_file_actions_init (&actions) == 0);
  ASSERT (posix_spawn_file_actions_addopen (&actions, STDOUT_FILENO,
                                            DATA_FILENAME,
                                            O_RDWR | O_CREAT | O_TRUNC, 0600)
          == 0);

  {
    size_t i;

    for (i = 0; i < 2; i++)
      {
        const char *prog_path =
          (i == 0 ? SRCDIR "executable-script" : SRCDIR "executable-script.sh");
        const char *prog_argv[2] = { prog_path, NULL };

        int err = posix_spawn (&child, prog_path, &actions, NULL,
                               (char **) prog_argv, environ);
        if (err != ENOEXEC)
          {
            if (err != 0)
              {
                errno = err;
                perror ("posix_spawn");
                return 1;
              }

            /* Wait for child.  */
            int status = 0;
            while (waitpid (child, &status, 0) != child)
              ;
            if (!WIFEXITED (status))
              {
                fprintf (stderr, "subprocess terminated with unexpected wait status %d\n", status);
                return 1;
              }
            int exitstatus = WEXITSTATUS (status);
            if (exitstatus != 127)
              {
                fprintf (stderr, "subprocess terminated with unexpected exit status %d\n", exitstatus);
                return 1;
              }
          }
      }
  }

#if defined _WIN32 && !defined __CYGWIN__
  /* On native Windows, scripts - even with '#!' marker - are not executable.
     Only .bat and .cmd files are.  */
  fprintf (stderr, "Skipping test: scripts are not executable on this platform.\n");
  return 77;
#else
  {
    const char *prog_path = SRCDIR "executable-shell-script";
    const char *prog_argv[2] = { prog_path, NULL };

    int err = posix_spawn (&child, prog_path, &actions, NULL,
                           (char **) prog_argv, environ);
    if (err != 0)
      {
        errno = err;
        perror ("posix_spawn");
        return 1;
      }

    posix_spawn_file_actions_destroy (&actions);

    /* Wait for child.  */
    int status = 0;
    while (waitpid (child, &status, 0) != child)
      ;
    if (!WIFEXITED (status))
      {
        fprintf (stderr, "subprocess terminated with unexpected wait status %d\n", status);
        return 1;
      }
    int exitstatus = WEXITSTATUS (status);
    if (exitstatus != 0)
      {
        fprintf (stderr, "subprocess terminated with unexpected exit status %d\n", exitstatus);
        return 1;
      }

    /* Check the contents of the data file.  */
    FILE *fp = fopen (DATA_FILENAME, "rb");
    if (fp == NULL)
      {
        perror ("cannot open data file");
        return 1;
      }
    char buf[1024];
    int nread = fread (buf, 1, sizeof (buf), fp);
    if (!(nread == 11 && memcmp (buf, "Halle Potta", 11) == 0))
      {
        fprintf (stderr, "data file wrong: has %d bytes, expected %d bytes\n", nread, 11);
        return 1;
      }
    if (fclose (fp))
      {
        perror ("cannot close data file");
        return 1;
      }
  }
#endif

  /* Clean up data file.  */
  unlink (DATA_FILENAME);

  return 0;
}
