File: edit.c

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/* virt-edit
 * Copyright (C) 2009-2019 Red Hat 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 2 of the License, 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <config.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <unistd.h>
#include <locale.h>
#include <getopt.h>
#include <errno.h>
#include <error.h>
#include <assert.h>
#include <libintl.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <utime.h>

#include "xvasprintf.h"
#include "getprogname.h"

#include "guestfs.h"
#include "options.h"
#include "display-options.h"
#include "windows.h"
#include "file-edit.h"

/* Currently open libguestfs handle. */
guestfs_h *g;

int read_only = 0;
int live = 0;
int verbose = 0;
int keys_from_stdin = 0;
int echo_keys = 0;
const char *libvirt_uri = NULL;
int inspector = 1;
int in_guestfish = 0;
int in_virt_rescue = 0;

static const char *backup_extension = NULL;
static const char *perl_expr = NULL;

static void edit_files (int argc, char *argv[]);
static void edit (const char *filename, const char *root);

static void __attribute__((noreturn))
usage (int status)
{
  if (status != EXIT_SUCCESS)
    fprintf (stderr, _("Try ‘%s --help’ for more information.\n"),
             getprogname ());
  else {
    printf (_("%s: Edit a file in a virtual machine\n"
              "Copyright (C) 2009-2019 Red Hat Inc.\n"
              "Usage:\n"
              "  %s [--options] -d domname file [file ...]\n"
              "  %s [--options] -a disk.img [-a disk.img ...] file [file ...]\n"
              "Options:\n"
              "  -a|--add image        Add image\n"
              "  -b|--backup .ext      Backup original as original.ext\n"
              "  -c|--connect uri      Specify libvirt URI for -d option\n"
              "  -d|--domain guest     Add disks from libvirt guest\n"
              "  --echo-keys           Don't turn off echo for passphrases\n"
              "  -e|--edit|--expr expr Non-interactive editing using Perl expr\n"
              "  --format[=raw|..]     Force disk format for -a option\n"
              "  --help                Display brief help\n"
              "  --key selector       Specify a LUKS key\n"
              "  --keys-from-stdin     Read passphrases from stdin\n"
              "  -m|--mount dev[:mnt[:opts[:fstype]]]\n"
              "                        Mount dev on mnt (if omitted, /)\n"
              "  -v|--verbose          Verbose messages\n"
              "  -V|--version          Display version and exit\n"
              "  -x                    Trace libguestfs API calls\n"
              "For more information, see the manpage %s(1).\n"),
            getprogname (), getprogname (),
            getprogname (), getprogname ());
  }
  exit (status);
}

int
main (int argc, char *argv[])
{
  setlocale (LC_ALL, "");
  bindtextdomain (PACKAGE, LOCALEBASEDIR);
  textdomain (PACKAGE);

  enum { HELP_OPTION = CHAR_MAX + 1 };

  static const char options[] = "a:b:c:d:e:m:vVx";
  static const struct option long_options[] = {
    { "add", 1, 0, 'a' },
    { "backup", 1, 0, 'b' },
    { "connect", 1, 0, 'c' },
    { "domain", 1, 0, 'd' },
    { "echo-keys", 0, 0, 0 },
    { "edit", 1, 0, 'e' },
    { "expr", 1, 0, 'e' },
    { "format", 2, 0, 0 },
    { "help", 0, 0, HELP_OPTION },
    { "key", 1, 0, 0 },
    { "keys-from-stdin", 0, 0, 0 },
    { "long-options", 0, 0, 0 },
    { "mount", 1, 0, 'm' },
    { "short-options", 0, 0, 0 },
    { "verbose", 0, 0, 'v' },
    { "version", 0, 0, 'V' },
    { 0, 0, 0, 0 }
  };
  struct drv *drvs = NULL;
  struct drv *drv;
  struct mp *mps = NULL;
  struct mp *mp;
  char *p;
  const char *format = NULL;
  bool format_consumed = true;
  int c;
  int option_index;
  struct key_store *ks = NULL;

  g = guestfs_create ();
  if (g == NULL)
    error (EXIT_FAILURE, errno, "guestfs_create");

  for (;;) {
    c = getopt_long (argc, argv, options, long_options, &option_index);
    if (c == -1) break;

    switch (c) {
    case 0:			/* options which are long only */
      if (STREQ (long_options[option_index].name, "long-options"))
        display_long_options (long_options);
      else if (STREQ (long_options[option_index].name, "short-options"))
        display_short_options (options);
      else if (STREQ (long_options[option_index].name, "keys-from-stdin")) {
        keys_from_stdin = 1;
      } else if (STREQ (long_options[option_index].name, "echo-keys")) {
        echo_keys = 1;
      } else if (STREQ (long_options[option_index].name, "format")) {
        OPTION_format;
      } else if (STREQ (long_options[option_index].name, "key")) {
        OPTION_key;
      } else
        error (EXIT_FAILURE, 0,
               _("unknown long option: %s (%d)"),
               long_options[option_index].name, option_index);
      break;

    case 'a':
      OPTION_a;
      break;

    case 'b':
      if (backup_extension)
        error (EXIT_FAILURE, 0, _("-b option given multiple times"));
      backup_extension = optarg;
      break;

    case 'c':
      OPTION_c;
      break;

    case 'd':
      OPTION_d;
      break;

    case 'e':
      if (perl_expr)
        error (EXIT_FAILURE, 0, _("-e option given multiple times"));
      perl_expr = optarg;
      break;

    case 'm':
      OPTION_m;
      inspector = 0;
      break;

    case 'v':
      OPTION_v;
      break;

    case 'V':
      OPTION_V;
      break;

    case 'x':
      OPTION_x;
      break;

    case HELP_OPTION:
      usage (EXIT_SUCCESS);

    default:
      usage (EXIT_FAILURE);
    }
  }

  /* Old-style syntax?  There were no -a or -d options in the old
   * virt-edit which is how we detect this.
   */
  if (drvs == NULL) {
    /* argc - 1 because last parameter is the single filename. */
    while (optind < argc - 1) {
      if (strchr (argv[optind], '/') ||
          access (argv[optind], F_OK) == 0) { /* simulate -a option */
        drv = calloc (1, sizeof (struct drv));
        if (!drv)
          error (EXIT_FAILURE, errno, "calloc");
        drv->type = drv_a;
        drv->a.filename = strdup (argv[optind]);
        if (!drv->a.filename)
          error (EXIT_FAILURE, errno, "strdup");
        drv->next = drvs;
        drvs = drv;
      } else {                  /* simulate -d option */
        drv = calloc (1, sizeof (struct drv));
        if (!drv)
          error (EXIT_FAILURE, errno, "calloc");
        drv->type = drv_d;
        drv->d.guest = argv[optind];
        drv->next = drvs;
        drvs = drv;
      }

      optind++;
    }
  }

  /* These are really constants, but they have to be variables for the
   * options parsing code.  Assert here that they have known-good
   * values.
   */
  assert (read_only == 0);
  assert (inspector == 1 || mps != NULL);
  assert (live == 0);

  /* User must specify at least one filename on the command line. */
  if (optind >= argc || argc - optind < 1)
    usage (EXIT_FAILURE);

  CHECK_OPTION_format_consumed;

  /* User must have specified some drives. */
  if (drvs == NULL) {
    fprintf (stderr, _("%s: error: you must specify at least one -a or -d option.\n"),
             getprogname ());
    usage (EXIT_FAILURE);
  }

  /* Add drives. */
  add_drives (drvs);

  if (guestfs_launch (g) == -1)
    exit (EXIT_FAILURE);

  if (mps != NULL)
    mount_mps (mps);
  else
    inspect_mount ();

  /* Free up data structures, no longer needed after this point. */
  free_drives (drvs);
  free_mps (mps);
  free_key_store (ks);

  edit_files (argc - optind, &argv[optind]);

  /* Cleanly unmount the disks after editing. */
  if (guestfs_shutdown (g) == -1)
    exit (EXIT_FAILURE);

  guestfs_close (g);

  exit (EXIT_SUCCESS);
}

static void
edit_files (int argc, char *argv[])
{
  int i;
  char *root = NULL;
  CLEANUP_FREE_STRING_LIST char **roots = NULL;

  if (inspector) {
    roots = guestfs_inspect_get_roots (g);
    if (!roots)
      exit (EXIT_FAILURE);

    /* Get root mountpoint. */
    /* see fish/inspect.c:inspect_mount */
    assert (roots[0] != NULL && roots[1] == NULL);
    root = roots[0];
  }

  for (i = 0; i < argc; ++i)
    edit (argv[i], root);
}

static void
edit (const char *filename, const char *root)
{
  CLEANUP_FREE char *filename_to_free = NULL;
  int r;

  /* Windows?  Special handling is required. */
  if (root != NULL && is_windows (g, root)) {
    filename = filename_to_free = windows_path (g, root, filename,
                                                0 /* not read only */);
    if (filename == NULL)
      exit (EXIT_FAILURE);
  }

  if (perl_expr != NULL) {
    r = edit_file_perl (g, filename, perl_expr, backup_extension, verbose);
  } else
    r = edit_file_editor (g, filename, NULL /* use $EDITOR */,
                          backup_extension, verbose);

  switch (r) {
  case -1:
    exit (EXIT_FAILURE);
  case 1:
    printf ("File not changed.\n");
    break;
  default:
    /* Success. */
    break;
  }
}