+
+/* 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);
+
+ /* Don't use guestfs_mount here because that will default to mount
+ * options -o sync,noatime. For more information, see guestfs(3)
+ * section "LIBGUESTFS GOTCHAS".
+ */
+ const char *options = read_only ? "ro" : "";
+ r = guestfs_mount_options (g, options, mp->device, mp->mountpoint);
+ if (r == -1)
+ exit (EXIT_FAILURE);
+ }
+}
+
+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 (EXIT_FAILURE);
+ }
+}
+
+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 && c_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 (EXIT_FAILURE);
+ }
+ 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 (EXIT_FAILURE);
+ 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 (EXIT_FAILURE);
+ 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 (EXIT_FAILURE);
+ 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 (EXIT_FAILURE);
+ 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 (EXIT_FAILURE);
+ 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 (EXIT_FAILURE);
+ 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 (EXIT_FAILURE);
+ goto next_command;
+ }
+
+ argv[i] = NULL;
+
+ got_command:
+ if (issue_command (cmd, argv, pipe) == -1) {
+ if (exit_on_error) exit (EXIT_FAILURE);
+ }
+
+ 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 (STREQ (cmd, ":")) {
+ fprintf (stderr, _("%s: empty command on command line\n"), program_name);
+ exit (EXIT_FAILURE);
+ }
+
+ /* Allow -cmd on the command line to mean (temporarily) override
+ * the normal exit on error (RHBZ#578407).
+ */
+ if (cmd[0] == '-') {
+ exit_on_error = 0;
+ cmd++;
+ }
+
+ params = &argv[optind];
+
+ /* Search for end of command list or ":" ... */
+ while (optind < argc && STRNEQ (argv[optind], ":"))
+ optind++;
+
+ if (optind == argc) {
+ if (issue_command (cmd, params, NULL) == -1 && exit_on_error)
+ exit (EXIT_FAILURE);
+ } else {
+ argv[optind] = NULL;
+ if (issue_command (cmd, params, NULL) == -1 && exit_on_error)
+ exit (EXIT_FAILURE);
+ 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;
+
+ /* This counts the commands issued, starting at 1. */
+ command_num++;
+
+ 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 (STRCASEEQ (cmd, "help")) {
+ if (argc == 0)
+ list_commands ();
+ else
+ display_command (argv[0]);
+ r = 0;
+ }
+ else if (STRCASEEQ (cmd, "quit") ||
+ STRCASEEQ (cmd, "exit") ||
+ STRCASEEQ (cmd, "q")) {
+ quit = 1;
+ r = 0;
+ }
+ else if (STRCASEEQ (cmd, "alloc") ||
+ STRCASEEQ (cmd, "allocate"))
+ r = do_alloc (cmd, argc, argv);
+ else if (STRCASEEQ (cmd, "echo"))
+ r = do_echo (cmd, argc, argv);
+ else if (STRCASEEQ (cmd, "edit") ||
+ STRCASEEQ (cmd, "vi") ||
+ STRCASEEQ (cmd, "emacs"))
+ r = do_edit (cmd, argc, argv);
+ else if (STRCASEEQ (cmd, "lcd"))
+ r = do_lcd (cmd, argc, argv);
+ else if (STRCASEEQ (cmd, "glob"))
+ r = do_glob (cmd, argc, argv);
+ else if (STRCASEEQ (cmd, "more") ||
+ STRCASEEQ (cmd, "less"))
+ r = do_more (cmd, argc, argv);
+ else if (STRCASEEQ (cmd, "reopen"))
+ r = do_reopen (cmd, argc, argv);
+ else if (STRCASEEQ (cmd, "sparse"))
+ r = do_sparse (cmd, argc, argv);
+ else if (STRCASEEQ (cmd, "time"))
+ 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",
+ "sparse", _("allocate a sparse image file"));
+ 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 (STRCASEEQ (cmd, "alloc") ||
+ STRCASEEQ (cmd, "allocate"))
+ 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>T or <nn>TB number of terabytes\n"
+ " <nn>P or <nn>PB number of petabytes\n"
+ " <nn>E or <nn>EB number of exabytes\n"
+ " <nn>sects number of 512 byte sectors\n"));
+ else if (STRCASEEQ (cmd, "echo"))
+ printf (_("echo - display a line of text\n"
+ " echo [<params> ...]\n"
+ "\n"
+ " This echos the parameters to the terminal.\n"));
+ else if (STRCASEEQ (cmd, "edit") ||
+ STRCASEEQ (cmd, "vi") ||
+ STRCASEEQ (cmd, "emacs"))
+ 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 (STRCASEEQ (cmd, "lcd"))
+ 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 (STRCASEEQ (cmd, "glob"))
+ 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 (STRCASEEQ (cmd, "help"))
+ printf (_("help - display a list of commands or help on a command\n"
+ " help cmd\n"
+ " help\n"));
+ else if (STRCASEEQ (cmd, "more") ||
+ STRCASEEQ (cmd, "less"))
+ 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 (STRCASEEQ (cmd, "quit") ||
+ STRCASEEQ (cmd, "exit") ||
+ STRCASEEQ (cmd, "q"))
+ printf (_("quit - quit guestfish\n"
+ " quit\n"));
+ else if (STRCASEEQ (cmd, "reopen"))
+ 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 (STRCASEEQ (cmd, "sparse"))
+ printf (_("sparse - allocate a sparse image file\n"
+ " sparse <filename> <size>\n"
+ "\n"
+ " This creates an empty sparse file of the given size,\n"
+ " and then adds so it can be further examined.\n"
+ "\n"
+ " In all respects it works the same as the 'alloc'\n"
+ " command, except that the image file is allocated\n"
+ " sparsely, which means that disk blocks are not assigned\n"
+ " to the file until they are needed. Sparse disk files\n"
+ " only use space when written to, but they are slower\n"
+ " and there is a danger you could run out of real disk\n"
+ " space during a write operation.\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>T or <nn>TB number of terabytes\n"
+ " <nn>P or <nn>PB number of petabytes\n"
+ " <nn>E or <nn>EB number of exabytes\n"
+ " <nn>sects number of 512 byte sectors\n"));
+ else if (STRCASEEQ (cmd, "time"))
+ 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);
+}
+
+/* This is printed when the user types in an unknown command for the
+ * first command issued. A common case is the user doing:
+ * guestfish disk.img
+ * expecting guestfish to open 'disk.img' (in fact, this tried to
+ * run a command 'disk.img').
+ */
+void
+extended_help_message (void)
+{
+ fprintf (stderr,
+ _("Did you mean to open a disk image? guestfish -a disk.img\n"
+ "For a list of commands: guestfish -h\n"
+ "For complete documentation: man guestfish\n"));
+}
+
+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
+ STRCASENEQ (str, "0") &&
+ STRCASENEQ (str, "f") &&
+ STRCASENEQ (str, "false") &&
+ STRCASENEQ (str, "n") &&
+ STRCASENEQ (str, "no");
+}
+
+/* Free strings from a non-NULL terminated char** */
+static void
+free_n_strings (char **str, size_t len)
+{
+ size_t i;
+
+ for (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 && (!c_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 (EXIT_FAILURE);
+ }
+ 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 (EXIT_FAILURE);
+ }
+ 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 (EXIT_FAILURE);
+ }
+ 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);
+
+#ifdef HAVE_APPEND_HISTORY
+ (void) append_history (nr_history_lines, histfile);
+#else
+ (void) write_history (histfile);
+#endif
+ }
+#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;
+}
+
+/* Resolve the special "win:..." form for Windows-specific paths.
+ * This always returns a newly allocated string which is freed by the
+ * caller function in "cmds.c".
+ */
+char *
+resolve_win_path (const char *path)
+{
+ char *ret;
+ size_t i;
+
+ if (STRCASENEQLEN (path, "win:", 4)) {
+ ret = strdup (path);
+ if (ret == NULL)
+ perror ("strdup");
+ return ret;
+ }
+
+ path += 4;
+
+ /* Drop drive letter, if it's "C:". */
+ if (STRCASEEQLEN (path, "c:", 2))
+ path += 2;
+
+ if (!*path) {
+ ret = strdup ("/");
+ if (ret == NULL)
+ perror ("strdup");
+ return ret;
+ }
+
+ ret = strdup (path);
+ if (ret == NULL) {
+ perror ("strdup");
+ return NULL;
+ }
+
+ /* Blindly convert any backslashes into forward slashes. Is this good? */
+ for (i = 0; i < strlen (ret); ++i)
+ if (ret[i] == '\\')
+ ret[i] = '/';
+
+ char *t = guestfs_case_sensitive_path (g, ret);
+ free (ret);
+ ret = t;
+
+ return ret;
+}