X-Git-Url: http://git.annexia.org/?p=libguestfs.git;a=blobdiff_plain;f=fish%2Ffish.c;h=9316edaae494dadc34b31528b6f22ad18743ea1d;hp=85543004023475d7b16e075b0e4682ecfcab5d5a;hb=22cee80bc2f631703bf417a54ef4e0f0837e921a;hpb=bc0b3d6f473e607972d29be27f7ae6b1d0489c3b

diff --git a/fish/fish.c b/fish/fish.c
index 8554300..9316eda 100644
--- a/fish/fish.c
+++ b/fish/fish.c
@@ -1,5 +1,5 @@
-/* guestfish - the filesystem shell
- * Copyright (C) 2009 Red Hat Inc. 
+/* guestfish - the filesystem interactive shell
+ * Copyright (C) 2009 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
@@ -22,90 +22,432 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <fcntl.h>
 #include <getopt.h>
+#include <signal.h>
+#include <assert.h>
+#include <ctype.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#ifdef HAVE_LIBREADLINE
+#include <readline/readline.h>
+#include <readline/history.h>
+#endif
 
 #include <guestfs.h>
 
 #include "fish.h"
+#include "closeout.h"
+#include "progname.h"
 
-static void
-usage (void)
-{
-  fprintf (stderr,
-	   "guestfish: guest filesystem shell\n"
-	   "guestfish lets you edit virtual machine filesystems\n"
-	   "Copyright (C) 2009 Red Hat Inc.\n"
-	   "Usage:\n"
-	   "  guestfish [--options] [cmd]\n"
-	   "or for interactive use:\n"
-	   "  guestfish\n"
-	   "or from a shell script:\n"
-	   "  guestfish <<EOF\n"
-	   "  cmd\n"
-	   "  ...\n"
-	   "  EOF\n"
-	   "Options:\n"
-	   "  -h|--cmd-help       List available commands\n"
-	   "  -h|--cmd-help cmd   Display detailed help on 'cmd'\n"
-	   "For more information, see the manual page guestfish(1).\n");
+struct mp {
+  struct mp *next;
+  char *device;
+  char *mountpoint;
+};
+
+struct drv {
+  struct drv *next;
+  char *filename;
+};
+
+static void add_drives (struct drv *drv);
+static void mount_mps (struct mp *mp);
+static void interactive (void);
+static void shell_script (void);
+static void script (int prompt);
+static void cmdline (char *argv[], int optind, int argc);
+static void initialize_readline (void);
+static void cleanup_readline (void);
+static void add_history_line (const char *);
+
+/* Currently open libguestfs handle. */
+guestfs_h *g;
+
+int read_only = 0;
+int quit = 0;
+int verbose = 0;
+int echo_commands = 0;
+int remote_control_listen = 0;
+int remote_control = 0;
+int exit_on_error = 1;
+
+int
+launch (guestfs_h *_g)
+{
+  assert (_g == g);
+
+  if (guestfs_is_config (g)) {
+    if (guestfs_launch (g) == -1)
+      return -1;
+    if (guestfs_wait_ready (g) == -1)
+      return -1;
+  }
+  return 0;
+}
+
+static void __attribute__((noreturn))
+usage (int status)
+{
+  if (status != EXIT_SUCCESS)
+    fprintf (stderr, _("Try `%s --help' for more information.\n"),
+             program_name);
+  else {
+    fprintf (stdout,
+           _("%s: guest filesystem shell\n"
+             "%s lets you edit virtual machine filesystems\n"
+             "Copyright (C) 2009 Red Hat Inc.\n"
+             "Usage:\n"
+             "  %s [--options] cmd [: cmd : cmd ...]\n"
+             "  %s -i libvirt-domain\n"
+             "  %s -i disk-image(s)\n"
+             "or for interactive use:\n"
+             "  %s\n"
+             "or from a shell script:\n"
+             "  %s <<EOF\n"
+             "  cmd\n"
+             "  ...\n"
+             "  EOF\n"
+             "Options:\n"
+             "  -h|--cmd-help        List available commands\n"
+             "  -h|--cmd-help cmd    Display detailed help on 'cmd'\n"
+             "  -a|--add image       Add image\n"
+             "  -D|--no-dest-paths   Don't tab-complete paths from guest fs\n"
+             "  -f|--file file       Read commands from file\n"
+             "  -i|--inspector       Run virt-inspector to get disk mountpoints\n"
+             "  --listen             Listen for remote commands\n"
+             "  -m|--mount dev[:mnt] Mount dev on mnt (if omitted, /)\n"
+             "  -n|--no-sync         Don't autosync\n"
+             "  --remote[=pid]       Send commands to remote %s\n"
+             "  -r|--ro              Mount read-only\n"
+             "  --selinux            Enable SELinux support\n"
+             "  -v|--verbose         Verbose messages\n"
+             "  -x                   Echo each command before executing it\n"
+             "  -V|--version         Display version and exit\n"
+             "For more information,  see the manpage %s(1).\n"),
+             program_name, program_name, program_name,
+             program_name, program_name, program_name,
+             program_name, program_name, program_name);
+  }
+  exit (status);
 }
 
 int
 main (int argc, char *argv[])
 {
-  static const char *options = "h::?";
-  static struct option long_options[] = {
+  /* Set global program name that is not polluted with libtool artifacts.  */
+  set_program_name (argv[0]);
+
+  atexit (close_stdout);
+
+  enum { HELP_OPTION = CHAR_MAX + 1 };
+
+  static const char *options = "a:Df:h::im:nrv?Vx";
+  static const struct option long_options[] = {
+    { "add", 1, 0, 'a' },
     { "cmd-help", 2, 0, 'h' },
-    { "help", 0, 0, '?' },
+    { "file", 1, 0, 'f' },
+    { "help", 0, 0, HELP_OPTION },
+    { "inspector", 0, 0, 'i' },
+    { "listen", 0, 0, 0 },
+    { "mount", 1, 0, 'm' },
+    { "no-dest-paths", 0, 0, 'D' },
+    { "no-sync", 0, 0, 'n' },
+    { "remote", 2, 0, 0 },
+    { "ro", 0, 0, 'r' },
+    { "selinux", 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, *file = NULL;
   int c;
+  int inspector = 0;
+  int option_index;
+  struct sigaction sa;
+
+  initialize_readline ();
+
+  memset (&sa, 0, sizeof sa);
+  sa.sa_handler = SIG_IGN;
+  sa.sa_flags = SA_RESTART;
+  sigaction (SIGPIPE, &sa, NULL);
+
+  /* guestfs_create is meant to be a lightweight operation, so
+   * it's OK to do it early here.
+   */
+  g = guestfs_create ();
+  if (g == NULL) {
+    fprintf (stderr, _("guestfs_create: failed to create handle\n"));
+    exit (1);
+  }
+
+  guestfs_set_autosync (g, 1);
+
+  /* If developing, add ./appliance to the path.  Note that libtools
+   * interferes with this because uninstalled guestfish is a shell
+   * script that runs the real program with an absolute path.  Detect
+   * that too.
+   *
+   * BUT if LIBGUESTFS_PATH environment variable is already set by
+   * the user, then don't override it.
+   */
+  if (getenv ("LIBGUESTFS_PATH") == NULL &&
+      argv[0] &&
+      (argv[0][0] != '/' || strstr (argv[0], "/.libs/lt-") != NULL))
+    guestfs_set_path (g, "appliance:" GUESTFS_DEFAULT_PATH);
+
+  /* CAUTION: we are careful to modify argv[0] here, only after
+   * using it just above.
+   *
+   * getopt_long uses argv[0], so give it the sanitized name.  Save a copy
+   * of the original, in case it's needed in virt-inspector mode, below.
+   */
+  char *real_argv0 = argv[0];
+  argv[0] = bad_cast (program_name);
 
   for (;;) {
-    c = getopt_long (argc, argv, options, long_options, NULL);
+    c = getopt_long (argc, argv, options, long_options, &option_index);
     if (c == -1) break;
 
     switch (c) {
+    case 0:			/* options which are long only */
+      if (strcmp (long_options[option_index].name, "listen") == 0)
+        remote_control_listen = 1;
+      else if (strcmp (long_options[option_index].name, "remote") == 0) {
+        if (optarg) {
+          if (sscanf (optarg, "%d", &remote_control) != 1) {
+            fprintf (stderr, _("%s: --listen=PID: PID was not a number: %s\n"),
+                     program_name, optarg);
+            exit (1);
+          }
+        } else {
+          p = getenv ("GUESTFISH_PID");
+          if (!p || sscanf (p, "%d", &remote_control) != 1) {
+            fprintf (stderr, _("%s: remote: $GUESTFISH_PID must be set"
+                               " to the PID of the remote process\n"),
+                     program_name);
+            exit (1);
+          }
+        }
+      } else if (strcmp (long_options[option_index].name, "selinux") == 0) {
+        guestfs_set_selinux (g, 1);
+      } else {
+        fprintf (stderr, _("%s: unknown long option: %s (%d)\n"),
+                 program_name, long_options[option_index].name, option_index);
+        exit (1);
+      }
+      break;
+
+    case 'a':
+      if (access (optarg, R_OK) != 0) {
+        perror (optarg);
+        exit (1);
+      }
+      drv = malloc (sizeof (struct drv));
+      if (!drv) {
+        perror ("malloc");
+        exit (1);
+      }
+      drv->filename = optarg;
+      drv->next = drvs;
+      drvs = drv;
+      break;
+
+    case 'D':
+      complete_dest_paths = 0;
+      break;
+
+    case 'f':
+      if (file) {
+        fprintf (stderr, _("%s: only one -f parameter can be given\n"),
+                 program_name);
+        exit (1);
+      }
+      file = optarg;
+      break;
+
     case 'h':
       if (optarg)
-	display_command (optarg);
+        display_command (optarg);
       else if (argv[optind] && argv[optind][0] != '-')
-	display_command (argv[optind++]);
+        display_command (argv[optind++]);
       else
-	list_commands ();
+        list_commands ();
       exit (0);
 
-    case '?':
-      usage ();
+    case 'i':
+      inspector = 1;
+      break;
+
+    case 'm':
+      mp = malloc (sizeof (struct mp));
+      if (!mp) {
+        perror ("malloc");
+        exit (1);
+      }
+      p = strchr (optarg, ':');
+      if (p) {
+        *p = '\0';
+        mp->mountpoint = p+1;
+      } else
+        mp->mountpoint = bad_cast ("/");
+      mp->device = optarg;
+      mp->next = mps;
+      mps = mp;
+      break;
+
+    case 'n':
+      guestfs_set_autosync (g, 0);
+      break;
+
+    case 'r':
+      read_only = 1;
+      break;
+
+    case 'v':
+      verbose++;
+      guestfs_set_verbose (g, verbose);
+      break;
+
+    case 'V':
+      printf ("%s %s\n", program_name, PACKAGE_VERSION);
       exit (0);
 
+    case 'x':
+      echo_commands = 1;
+      break;
+
+    case HELP_OPTION:
+      usage (0);
+
     default:
-      fprintf (stderr, "guestfish: unexpected command line option 0x%x\n", c);
-      exit (1);
+      usage (1);
     }
   }
 
-  if (optind < argc) {
-    usage ();
-    exit (1);
-  }
+  /* Inspector mode invalidates most of the other arguments. */
+  if (inspector) {
+    char cmd[1024];
+    int r;
 
+    if (drvs || mps || remote_control_listen || remote_control ||
+        guestfs_get_selinux (g)) {
+      fprintf (stderr, _("%s: cannot use -i option with -a, -m,"
+                         " --listen, --remote or --selinux\n"),
+               program_name);
+      exit (1);
+    }
+    if (optind >= argc) {
+      fprintf (stderr,
+           _("%s: -i requires a libvirt domain or path(s) to disk image(s)\n"),
+               program_name);
+      exit (1);
+    }
 
+    strcpy (cmd, "a=`virt-inspector");
+    while (optind < argc) {
+      if (strlen (cmd) + strlen (argv[optind]) + strlen (real_argv0) + 60
+          >= sizeof cmd) {
+        fprintf (stderr,
+                 _("%s: virt-inspector command too long for fixed-size buffer\n"),
+                 program_name);
+        exit (1);
+      }
+      strcat (cmd, " '");
+      strcat (cmd, argv[optind]);
+      strcat (cmd, "'");
+      optind++;
+    }
 
+    if (read_only)
+      strcat (cmd, " --ro-fish");
+    else
+      strcat (cmd, " --fish");
 
+    sprintf (&cmd[strlen(cmd)], "` && %s $a", real_argv0);
 
+    if (guestfs_get_verbose (g))
+      strcat (cmd, " -v");
+    if (!guestfs_get_autosync (g))
+      strcat (cmd, " -n");
 
+    if (verbose)
+      fprintf (stderr,
+               "%s -i: running virt-inspector command:\n%s\n", program_name, cmd);
 
+    r = system (cmd);
+    if (r == -1) {
+      perror ("system");
+      exit (1);
+    }
+    exit (WEXITSTATUS (r));
+  }
 
+  /* If we've got drives to add, add them now. */
+  add_drives (drvs);
 
+  /* If we've got mountpoints, we must launch the guest and mount them. */
+  if (mps != NULL) {
+    if (launch (g) == -1) exit (1);
+    mount_mps (mps);
+  }
 
+  /* Remote control? */
+  if (remote_control_listen && remote_control) {
+    fprintf (stderr,
+             _("%s: cannot use --listen and --remote options at the same time\n"),
+             program_name);
+    exit (1);
+  }
 
+  if (remote_control_listen) {
+    if (optind < argc) {
+      fprintf (stderr,
+               _("%s: extra parameters on the command line with --listen flag\n"),
+               program_name);
+      exit (1);
+    }
+    if (file) {
+      fprintf (stderr,
+               _("%s: cannot use --listen and --file options at the same time\n"),
+               program_name);
+      exit (1);
+    }
+    rc_listen ();
+  }
+
+  /* -f (file) parameter? */
+  if (file) {
+    close (0);
+    if (open (file, O_RDONLY) == -1) {
+      perror (file);
+      exit (1);
+    }
+  }
+
+  /* Interactive, shell script, or command(s) on the command line? */
+  if (optind >= argc) {
+    if (isatty (0))
+      interactive ();
+    else
+      shell_script ();
+  }
+  else
+    cmdline (argv, optind, argc);
+
+  cleanup_readline ();
 
   exit (0);
 }
 
 void
-pod2text (const char *heading, const char *str)
+pod2text (const char *name, const char *shortdesc, const char *str)
 {
   FILE *fp;
 
@@ -114,12 +456,842 @@ pod2text (const char *heading, const char *str)
     /* pod2text failed, maybe not found, so let's just print the
      * source instead, since that's better than doing nothing.
      */
-    printf ("%s\n\n%s\n", heading, str);
+    printf ("%s - %s\n\n%s\n", name, shortdesc, str);
     return;
   }
-  fputs ("=head1 ", fp);
-  fputs (heading, fp);
-  fputs ("\n\n", fp);
+  fprintf (fp, "=head1 %s - %s\n\n", name, shortdesc);
   fputs (str, fp);
   pclose (fp);
 }
+
+/* List is built in reverse order, so mount them in reverse order. */
+static void
+mount_mps (struct mp *mp)
+{
+  int r;
+
+  if (mp) {
+    mount_mps (mp->next);
+    if (!read_only)
+      r = guestfs_mount (g, mp->device, mp->mountpoint);
+    else
+      r = guestfs_mount_ro (g, mp->device, mp->mountpoint);
+    if (r == -1)
+      exit (1);
+  }
+}
+
+static void
+add_drives (struct drv *drv)
+{
+  int r;
+
+  if (drv) {
+    add_drives (drv->next);
+    if (!read_only)
+      r = guestfs_add_drive (g, drv->filename);
+    else
+      r = guestfs_add_drive_ro (g, drv->filename);
+    if (r == -1)
+      exit (1);
+  }
+}
+
+static void
+interactive (void)
+{
+  script (1);
+}
+
+static void
+shell_script (void)
+{
+  script (0);
+}
+
+#define FISH "><fs> "
+
+static char *line_read = NULL;
+
+static char *
+rl_gets (int prompt)
+{
+#ifdef HAVE_LIBREADLINE
+
+  if (prompt) {
+    if (line_read) {
+      free (line_read);
+      line_read = NULL;
+    }
+
+    line_read = readline (prompt ? FISH : "");
+
+    if (line_read && *line_read)
+      add_history_line (line_read);
+
+    return line_read;
+  }
+
+#endif /* HAVE_LIBREADLINE */
+
+  static char buf[8192];
+  int len;
+
+  if (prompt) printf (FISH);
+  line_read = fgets (buf, sizeof buf, stdin);
+
+  if (line_read) {
+    len = strlen (line_read);
+    if (len > 0 && buf[len-1] == '\n') buf[len-1] = '\0';
+  }
+
+  return line_read;
+}
+
+static void
+script (int prompt)
+{
+  char *buf;
+  char *cmd;
+  char *p, *pend;
+  char *argv[64];
+  int len;
+  int global_exit_on_error = !prompt;
+  int tilde_candidate;
+
+  if (prompt)
+    printf (_("\n"
+              "Welcome to guestfish, the libguestfs filesystem interactive shell for\n"
+              "editing virtual machine filesystems.\n"
+              "\n"
+              "Type: 'help' for help with commands\n"
+              "      'quit' to quit the shell\n"
+              "\n"));
+
+  while (!quit) {
+    char *pipe = NULL;
+
+    exit_on_error = global_exit_on_error;
+
+    buf = rl_gets (prompt);
+    if (!buf) {
+      quit = 1;
+      break;
+    }
+
+    /* Skip any initial whitespace before the command. */
+  again:
+    while (*buf && isspace (*buf))
+      buf++;
+
+    if (!*buf) continue;
+
+    /* If the next character is '#' then this is a comment. */
+    if (*buf == '#') continue;
+
+    /* If the next character is '!' then pass the whole lot to system(3). */
+    if (*buf == '!') {
+      int r;
+
+      r = system (buf+1);
+      if (exit_on_error) {
+        if (r == -1 ||
+            (WIFSIGNALED (r) &&
+             (WTERMSIG (r) == SIGINT || WTERMSIG (r) == SIGQUIT)) ||
+            WEXITSTATUS (r) != 0)
+          exit (1);
+      }
+      continue;
+    }
+
+    /* If the next character is '-' allow the command to fail without
+     * exiting on error (just for this one command though).
+     */
+    if (*buf == '-') {
+      exit_on_error = 0;
+      buf++;
+      goto again;
+    }
+
+    /* Get the command (cannot be quoted). */
+    len = strcspn (buf, " \t");
+
+    if (len == 0) continue;
+
+    cmd = buf;
+    unsigned int i = 0;
+    if (buf[len] == '\0') {
+      argv[0] = NULL;
+      goto got_command;
+    }
+
+    buf[len] = '\0';
+    p = &buf[len+1];
+    p += strspn (p, " \t");
+
+    /* Get the parameters. */
+    while (*p && i < sizeof argv / sizeof argv[0]) {
+      tilde_candidate = 0;
+
+      /* Parameters which start with quotes or pipes are treated
+       * specially.  Bare parameters are delimited by whitespace.
+       */
+      if (*p == '"') {
+        p++;
+        len = strcspn (p, "\"");
+        if (p[len] == '\0') {
+          fprintf (stderr, _("%s: unterminated double quote\n"), program_name);
+          if (exit_on_error) exit (1);
+          goto next_command;
+        }
+        if (p[len+1] && (p[len+1] != ' ' && p[len+1] != '\t')) {
+          fprintf (stderr,
+                   _("%s: command arguments not separated by whitespace\n"),
+                   program_name);
+          if (exit_on_error) exit (1);
+          goto next_command;
+        }
+        p[len] = '\0';
+        pend = p[len+1] ? &p[len+2] : &p[len+1];
+      } else if (*p == '\'') {
+        p++;
+        len = strcspn (p, "'");
+        if (p[len] == '\0') {
+          fprintf (stderr, _("%s: unterminated single quote\n"), program_name);
+          if (exit_on_error) exit (1);
+          goto next_command;
+        }
+        if (p[len+1] && (p[len+1] != ' ' && p[len+1] != '\t')) {
+          fprintf (stderr,
+                   _("%s: command arguments not separated by whitespace\n"),
+                   program_name);
+          if (exit_on_error) exit (1);
+          goto next_command;
+        }
+        p[len] = '\0';
+        pend = p[len+1] ? &p[len+2] : &p[len+1];
+      } else if (*p == '|') {
+        *p = '\0';
+        pipe = p+1;
+        continue;
+        /*
+      } else if (*p == '[') {
+        int c = 1;
+        p++;
+        pend = p;
+        while (*pend && c != 0) {
+          if (*pend == '[') c++;
+          else if (*pend == ']') c--;
+          pend++;
+        }
+        if (c != 0) {
+          fprintf (stderr,
+                   _("%s: unterminated \"[...]\" sequence\n"), program_name);
+          if (exit_on_error) exit (1);
+          goto next_command;
+        }
+        if (*pend && (*pend != ' ' && *pend != '\t')) {
+          fprintf (stderr,
+                   _("%s: command arguments not separated by whitespace\n"),
+                   program_name);
+          if (exit_on_error) exit (1);
+          goto next_command;
+        }
+        *(pend-1) = '\0';
+        */
+      } else if (*p != ' ' && *p != '\t') {
+        /* If the first character is a ~ then note that this parameter
+         * is a candidate for ~username expansion.  NB this does not
+         * apply to quoted parameters.
+         */
+        tilde_candidate = *p == '~';
+        len = strcspn (p, " \t");
+        if (p[len]) {
+          p[len] = '\0';
+          pend = &p[len+1];
+        } else
+          pend = &p[len];
+      } else {
+        fprintf (stderr, _("%s: internal error parsing string at '%s'\n"),
+                 program_name, p);
+        abort ();
+      }
+
+      if (!tilde_candidate)
+        argv[i] = p;
+      else
+        argv[i] = try_tilde_expansion (p);
+      i++;
+      p = pend;
+
+      if (*p)
+        p += strspn (p, " \t");
+    }
+
+    if (i == sizeof argv / sizeof argv[0]) {
+      fprintf (stderr, _("%s: too many arguments\n"), program_name);
+      if (exit_on_error) exit (1);
+      goto next_command;
+    }
+
+    argv[i] = NULL;
+
+  got_command:
+    if (issue_command (cmd, argv, pipe) == -1) {
+      if (exit_on_error) exit (1);
+    }
+
+  next_command:;
+  }
+  if (prompt) printf ("\n");
+}
+
+static void
+cmdline (char *argv[], int optind, int argc)
+{
+  const char *cmd;
+  char **params;
+
+  exit_on_error = 1;
+
+  if (optind >= argc) return;
+
+  cmd = argv[optind++];
+  if (strcmp (cmd, ":") == 0) {
+    fprintf (stderr, _("%s: empty command on command line\n"), program_name);
+    exit (1);
+  }
+  params = &argv[optind];
+
+  /* Search for end of command list or ":" ... */
+  while (optind < argc && strcmp (argv[optind], ":") != 0)
+    optind++;
+
+  if (optind == argc) {
+    if (issue_command (cmd, params, NULL) == -1) exit (1);
+  } else {
+    argv[optind] = NULL;
+    if (issue_command (cmd, params, NULL) == -1) exit (1);
+    cmdline (argv, optind+1, argc);
+  }
+}
+
+int
+issue_command (const char *cmd, char *argv[], const char *pipecmd)
+{
+  int argc;
+  int stdout_saved_fd = -1;
+  int pid = 0;
+  int i, r;
+
+  if (echo_commands) {
+    printf ("%s", cmd);
+    for (i = 0; argv[i] != NULL; ++i)
+      printf (" %s", argv[i]);
+    printf ("\n");
+  }
+
+  /* For | ... commands.  Annoyingly we can't use popen(3) here. */
+  if (pipecmd) {
+    int fd[2];
+
+    if (fflush (stdout) == EOF) {
+      perror ("failed to flush standard output");
+      return -1;
+    }
+    if (pipe (fd) < 0) {
+      perror ("pipe failed");
+      return -1;
+    }
+    pid = fork ();
+    if (pid == -1) {
+      perror ("fork");
+      return -1;
+    }
+
+    if (pid == 0) {		/* Child process. */
+      close (fd[1]);
+      if (dup2 (fd[0], 0) < 0) {
+        perror ("dup2 of stdin failed");
+        _exit (1);
+      }
+
+      r = system (pipecmd);
+      if (r == -1) {
+        perror (pipecmd);
+        _exit (1);
+      }
+      _exit (WEXITSTATUS (r));
+    }
+
+    if ((stdout_saved_fd = dup (1)) < 0) {
+      perror ("failed to dup stdout");
+      return -1;
+    }
+    close (fd[0]);
+    if (dup2 (fd[1], 1) < 0) {
+      perror ("failed to dup stdout");
+      close (stdout_saved_fd);
+      return -1;
+    }
+    close (fd[1]);
+  }
+
+  for (argc = 0; argv[argc] != NULL; ++argc)
+    ;
+
+  /* If --remote was set, then send this command to a remote process. */
+  if (remote_control)
+    r = rc_remote (remote_control, cmd, argc, argv, exit_on_error);
+
+  /* Otherwise execute it locally. */
+  else if (strcasecmp (cmd, "help") == 0) {
+    if (argc == 0)
+      list_commands ();
+    else
+      display_command (argv[0]);
+    r = 0;
+  }
+  else if (strcasecmp (cmd, "quit") == 0 ||
+           strcasecmp (cmd, "exit") == 0 ||
+           strcasecmp (cmd, "q") == 0) {
+    quit = 1;
+    r = 0;
+  }
+  else if (strcasecmp (cmd, "alloc") == 0 ||
+           strcasecmp (cmd, "allocate") == 0)
+    r = do_alloc (cmd, argc, argv);
+  else if (strcasecmp (cmd, "echo") == 0)
+    r = do_echo (cmd, argc, argv);
+  else if (strcasecmp (cmd, "edit") == 0 ||
+           strcasecmp (cmd, "vi") == 0 ||
+           strcasecmp (cmd, "emacs") == 0)
+    r = do_edit (cmd, argc, argv);
+  else if (strcasecmp (cmd, "lcd") == 0)
+    r = do_lcd (cmd, argc, argv);
+  else if (strcasecmp (cmd, "glob") == 0)
+    r = do_glob (cmd, argc, argv);
+  else if (strcasecmp (cmd, "more") == 0 ||
+           strcasecmp (cmd, "less") == 0)
+    r = do_more (cmd, argc, argv);
+  else if (strcasecmp (cmd, "reopen") == 0)
+    r = do_reopen (cmd, argc, argv);
+  else if (strcasecmp (cmd, "time") == 0)
+    r = do_time (cmd, argc, argv);
+  else
+    r = run_action (cmd, argc, argv);
+
+  /* Always flush stdout after every command, so that messages, results
+   * etc appear immediately.
+   */
+  if (fflush (stdout) == EOF) {
+    perror ("failed to flush standard output");
+    return -1;
+  }
+
+  if (pipecmd) {
+    close (1);
+    if (dup2 (stdout_saved_fd, 1) < 0) {
+      perror ("failed to dup2 standard output");
+      r = -1;
+    }
+    close (stdout_saved_fd);
+    if (waitpid (pid, NULL, 0) < 0) {
+      perror ("waiting for command to complete");
+      r = -1;
+    }
+  }
+
+  return r;
+}
+
+void
+list_builtin_commands (void)
+{
+  /* help and quit should appear at the top */
+  printf ("%-20s %s\n",
+          "help", _("display a list of commands or help on a command"));
+  printf ("%-20s %s\n",
+          "quit", _("quit guestfish"));
+
+  printf ("%-20s %s\n",
+          "alloc", _("allocate an image"));
+  printf ("%-20s %s\n",
+          "echo", _("display a line of text"));
+  printf ("%-20s %s\n",
+          "edit", _("edit a file in the image"));
+  printf ("%-20s %s\n",
+          "lcd", _("local change directory"));
+  printf ("%-20s %s\n",
+          "glob", _("expand wildcards in command"));
+  printf ("%-20s %s\n",
+          "more", _("view a file in the pager"));
+  printf ("%-20s %s\n",
+          "reopen", _("close and reopen libguestfs handle"));
+  printf ("%-20s %s\n",
+          "time", _("measure time taken to run command"));
+
+  /* actions are printed after this (see list_commands) */
+}
+
+void
+display_builtin_command (const char *cmd)
+{
+  /* help for actions is auto-generated, see display_command */
+
+  if (strcasecmp (cmd, "alloc") == 0 ||
+      strcasecmp (cmd, "allocate") == 0)
+    printf (_("alloc - allocate an image\n"
+              "     alloc <filename> <size>\n"
+              "\n"
+              "    This creates an empty (zeroed) file of the given size,\n"
+              "    and then adds so it can be further examined.\n"
+              "\n"
+              "    For more advanced image creation, see qemu-img utility.\n"
+              "\n"
+              "    Size can be specified (where <nn> means a number):\n"
+              "    <nn>             number of kilobytes\n"
+              "      eg: 1440       standard 3.5\" floppy\n"
+              "    <nn>K or <nn>KB  number of kilobytes\n"
+              "    <nn>M or <nn>MB  number of megabytes\n"
+              "    <nn>G or <nn>GB  number of gigabytes\n"
+              "    <nn>sects        number of 512 byte sectors\n"));
+  else if (strcasecmp (cmd, "echo") == 0)
+    printf (_("echo - display a line of text\n"
+              "     echo [<params> ...]\n"
+              "\n"
+              "    This echos the parameters to the terminal.\n"));
+  else if (strcasecmp (cmd, "edit") == 0 ||
+           strcasecmp (cmd, "vi") == 0 ||
+           strcasecmp (cmd, "emacs") == 0)
+    printf (_("edit - edit a file in the image\n"
+              "     edit <filename>\n"
+              "\n"
+              "    This is used to edit a file.\n"
+              "\n"
+              "    It is the equivalent of (and is implemented by)\n"
+              "    running \"cat\", editing locally, and then \"write-file\".\n"
+              "\n"
+              "    Normally it uses $EDITOR, but if you use the aliases\n"
+              "    \"vi\" or \"emacs\" you will get those editors.\n"
+              "\n"
+              "    NOTE: This will not work reliably for large files\n"
+              "    (> 2 MB) or binary files containing \\0 bytes.\n"));
+  else if (strcasecmp (cmd, "lcd") == 0)
+    printf (_("lcd - local change directory\n"
+              "    lcd <directory>\n"
+              "\n"
+              "    Change guestfish's current directory. This command is\n"
+              "    useful if you want to download files to a particular\n"
+              "    place.\n"));
+  else if (strcasecmp (cmd, "glob") == 0)
+    printf (_("glob - expand wildcards in command\n"
+              "    glob <command> [<args> ...]\n"
+              "\n"
+              "    Glob runs <command> with wildcards expanded in any\n"
+              "    command args.  Note that the command is run repeatedly\n"
+              "    once for each expanded argument.\n"));
+  else if (strcasecmp (cmd, "help") == 0)
+    printf (_("help - display a list of commands or help on a command\n"
+              "     help cmd\n"
+              "     help\n"));
+  else if (strcasecmp (cmd, "more") == 0 ||
+           strcasecmp (cmd, "less") == 0)
+    printf (_("more - view a file in the pager\n"
+              "     more <filename>\n"
+              "\n"
+              "    This is used to view a file in the pager.\n"
+              "\n"
+              "    It is the equivalent of (and is implemented by)\n"
+              "    running \"cat\" and using the pager.\n"
+              "\n"
+              "    Normally it uses $PAGER, but if you use the alias\n"
+              "    \"less\" then it always uses \"less\".\n"
+              "\n"
+              "    NOTE: This will not work reliably for large files\n"
+              "    (> 2 MB) or binary files containing \\0 bytes.\n"));
+  else if (strcasecmp (cmd, "quit") == 0 ||
+           strcasecmp (cmd, "exit") == 0 ||
+           strcasecmp (cmd, "q") == 0)
+    printf (_("quit - quit guestfish\n"
+              "     quit\n"));
+  else if (strcasecmp (cmd, "reopen") == 0)
+    printf (_("reopen - close and reopen the libguestfs handle\n"
+              "     reopen\n"
+              "\n"
+              "Close and reopen the libguestfs handle.  It is not necessary to use\n"
+              "this normally, because the handle is closed properly when guestfish\n"
+              "exits.  However this is occasionally useful for testing.\n"));
+  else if (strcasecmp (cmd, "time") == 0)
+    printf (_("time - measure time taken to run command\n"
+              "    time <command> [<args> ...]\n"
+              "\n"
+              "    This runs <command> as usual, and prints the elapsed\n"
+              "    time afterwards.\n"));
+  else
+    fprintf (stderr, _("%s: command not known, use -h to list all commands\n"),
+             cmd);
+}
+
+void
+free_strings (char **argv)
+{
+  int argc;
+
+  for (argc = 0; argv[argc] != NULL; ++argc)
+    free (argv[argc]);
+  free (argv);
+}
+
+int
+count_strings (char *const *argv)
+{
+  int c;
+
+  for (c = 0; argv[c]; ++c)
+    ;
+  return c;
+}
+
+void
+print_strings (char *const *argv)
+{
+  int argc;
+
+  for (argc = 0; argv[argc] != NULL; ++argc)
+    printf ("%s\n", argv[argc]);
+}
+
+void
+print_table (char *const *argv)
+{
+  int i;
+
+  for (i = 0; argv[i] != NULL; i += 2)
+    printf ("%s: %s\n", argv[i], argv[i+1]);
+}
+
+int
+is_true (const char *str)
+{
+  return
+    strcasecmp (str, "0") != 0 &&
+    strcasecmp (str, "f") != 0 &&
+    strcasecmp (str, "false") != 0 &&
+    strcasecmp (str, "n") != 0 &&
+    strcasecmp (str, "no") != 0;
+}
+
+/* Free strings from a non-NULL terminated char** */
+static void
+free_n_strings (char **str, size_t len)
+{
+  for (size_t i = 0; i < len; i++) {
+    free (str[i]);
+  }
+  free (str);
+}
+
+char **
+parse_string_list (const char *str)
+{
+  char **argv = NULL;
+  size_t argv_len = 0;
+
+  /* Current position pointer */
+  const char *p = str;
+
+  /* Token might be simple:
+   *  Token
+   * or be quoted:
+   *  'This is a single token'
+   * or contain embedded single-quoted sections:
+   *  This' is a sing'l'e to'ken
+   *
+   * The latter may seem over-complicated, but it's what a normal shell does.
+   * Not doing it risks surprising somebody.
+   *
+   * This outer loop is over complete tokens.
+   */
+  while (*p) {
+    char *tok = NULL;
+    size_t tok_len = 0;
+
+    /* Skip leading whitespace */
+    p += strspn (p, " \t");
+
+    char in_quote = 0;
+
+    /* This loop is over token 'fragments'. A token can be in multiple bits if
+     * it contains single quotes. We also treat both sides of an escaped quote
+     * as separate fragments because we can't just copy it: we have to remove
+     * the \.
+     */
+    while (*p && (!isblank (*p) || in_quote)) {
+      const char *end = p;
+
+      /* Check if the fragment starts with a quote */
+      if ('\'' == *p) {
+        /* Toggle in_quote */
+        in_quote = !in_quote;
+
+        /* Skip the quote */
+        p++; end++;
+      }
+
+      /* If we're in a quote, look for an end quote */
+      if (in_quote) {
+        end += strcspn (end, "'");
+      }
+
+      /* Otherwise, look for whitespace or a quote */
+      else {
+        end += strcspn (end, " \t'");
+      }
+
+      /* Grow the token to accommodate the fragment */
+      size_t tok_end = tok_len;
+      tok_len += end - p;
+      char *tok_new = realloc (tok, tok_len + 1);
+      if (NULL == tok_new) {
+        perror ("realloc");
+        free_n_strings (argv, argv_len);
+        free (tok);
+        exit (1);
+      }
+      tok = tok_new;
+
+      /* Check if we stopped on an escaped quote */
+      if ('\'' == *end && end != p && *(end-1) == '\\') {
+        /* Add everything before \' to the token */
+        memcpy (&tok[tok_end], p, end - p - 1);
+
+        /* Add the quote */
+        tok[tok_len-1] = '\'';
+
+        /* Already processed the quote */
+        p = end + 1;
+      }
+
+      else {
+        /* Add the whole fragment */
+        memcpy (&tok[tok_end], p, end - p);
+
+        p = end;
+      }
+    }
+
+    /* We've reached the end of a token. We shouldn't still be in quotes. */
+    if (in_quote) {
+      fprintf (stderr, _("Runaway quote in string \"%s\"\n"), str);
+
+      free_n_strings (argv, argv_len);
+
+      return NULL;
+    }
+
+    /* Add this token if there is one. There might not be if there was
+     * whitespace at the end of the input string */
+    if (tok) {
+      /* Add the NULL terminator */
+      tok[tok_len] = '\0';
+
+      /* Add the argument to the argument list */
+      argv_len++;
+      char **argv_new = realloc (argv, sizeof (*argv) * argv_len);
+      if (NULL == argv_new) {
+        perror ("realloc");
+        free_n_strings (argv, argv_len-1);
+        free (tok);
+        exit (1);
+      }
+      argv = argv_new;
+
+      argv[argv_len-1] = tok;
+    }
+  }
+
+  /* NULL terminate the argument list */
+  argv_len++;
+  char **argv_new = realloc (argv, sizeof (*argv) * argv_len);
+  if (NULL == argv_new) {
+    perror ("realloc");
+    free_n_strings (argv, argv_len-1);
+    exit (1);
+  }
+  argv = argv_new;
+
+  argv[argv_len-1] = NULL;
+
+  return argv;
+}
+
+#ifdef HAVE_LIBREADLINE
+static char histfile[1024];
+static int nr_history_lines = 0;
+#endif
+
+static void
+initialize_readline (void)
+{
+#ifdef HAVE_LIBREADLINE
+  const char *home;
+
+  home = getenv ("HOME");
+  if (home) {
+    snprintf (histfile, sizeof histfile, "%s/.guestfish", home);
+    using_history ();
+    (void) read_history (histfile);
+  }
+
+  rl_readline_name = "guestfish";
+  rl_attempted_completion_function = do_completion;
+#endif
+}
+
+static void
+cleanup_readline (void)
+{
+#ifdef HAVE_LIBREADLINE
+  int fd;
+
+  if (histfile[0] != '\0') {
+    fd = open (histfile, O_WRONLY|O_CREAT, 0644);
+    if (fd == -1) {
+      perror (histfile);
+      return;
+    }
+    close (fd);
+
+    (void) append_history (nr_history_lines, histfile);
+  }
+#endif
+}
+
+static void
+add_history_line (const char *line)
+{
+#ifdef HAVE_LIBREADLINE
+  add_history (line);
+  nr_history_lines++;
+#endif
+}
+
+int
+xwrite (int fd, const void *v_buf, size_t len)
+{
+  int r;
+  const char *buf = v_buf;
+
+  while (len > 0) {
+    r = write (fd, buf, len);
+    if (r == -1) {
+      perror ("write");
+      return -1;
+    }
+    buf += r;
+    len -= r;
+  }
+
+  return 0;
+}