1 /* guestfish - the filesystem interactive shell
2 * Copyright (C) 2009-2010 Red Hat Inc.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 #include <sys/types.h>
33 #ifdef HAVE_LIBREADLINE
34 #include <readline/readline.h>
35 #include <readline/history.h>
47 char *filename; /* disk filename (for -a or -N options) */
48 prep_data *data; /* prepared type (for -N option only) */
49 char *device; /* device inside the appliance */
58 static void add_drives (struct drv *drv);
59 static void prepare_drives (struct drv *drv);
60 static void mount_mps (struct mp *mp);
61 static int launch (void);
62 static void interactive (void);
63 static void shell_script (void);
64 static void script (int prompt);
65 static void cmdline (char *argv[], int optind, int argc);
66 static void initialize_readline (void);
67 static void cleanup_readline (void);
68 #ifdef HAVE_LIBREADLINE
69 static void add_history_line (const char *);
71 static void print_shell_quote (FILE *stream, const char *str);
73 /* Currently open libguestfs handle. */
79 int remote_control_listen = 0;
80 int remote_control = 0;
81 int exit_on_error = 1;
84 static void __attribute__((noreturn))
87 if (status != EXIT_SUCCESS)
88 fprintf (stderr, _("Try `%s --help' for more information.\n"),
92 _("%s: guest filesystem shell\n"
93 "%s lets you edit virtual machine filesystems\n"
94 "Copyright (C) 2009 Red Hat Inc.\n"
96 " %s [--options] cmd [: cmd : cmd ...]\n"
97 " %s -i libvirt-domain\n"
98 " %s -i disk-image(s)\n"
99 "or for interactive use:\n"
101 "or from a shell script:\n"
107 " -h|--cmd-help List available commands\n"
108 " -h|--cmd-help cmd Display detailed help on 'cmd'\n"
109 " -a|--add image Add image\n"
110 " -D|--no-dest-paths Don't tab-complete paths from guest fs\n"
111 " -f|--file file Read commands from file\n"
112 " -i|--inspector Run virt-inspector to get disk mountpoints\n"
113 " --listen Listen for remote commands\n"
114 " -m|--mount dev[:mnt] Mount dev on mnt (if omitted, /)\n"
115 " -n|--no-sync Don't autosync\n"
116 " -N|--new type Create prepared disk (test1.img, ...)\n"
117 " --remote[=pid] Send commands to remote %s\n"
118 " -r|--ro Mount read-only\n"
119 " --selinux Enable SELinux support\n"
120 " -v|--verbose Verbose messages\n"
121 " -x Echo each command before executing it\n"
122 " -V|--version Display version and exit\n"
123 "For more information, see the manpage %s(1).\n"),
124 program_name, program_name, program_name,
125 program_name, program_name, program_name,
126 program_name, program_name, program_name);
132 main (int argc, char *argv[])
134 /* Set global program name that is not polluted with libtool artifacts. */
135 set_program_name (argv[0]);
137 atexit (close_stdout);
139 setlocale (LC_ALL, "");
140 bindtextdomain (PACKAGE, LOCALEBASEDIR);
141 textdomain (PACKAGE);
143 enum { HELP_OPTION = CHAR_MAX + 1 };
145 static const char *options = "a:Df:h::im:nN:rv?Vx";
146 static const struct option long_options[] = {
147 { "add", 1, 0, 'a' },
148 { "cmd-help", 2, 0, 'h' },
149 { "file", 1, 0, 'f' },
150 { "help", 0, 0, HELP_OPTION },
151 { "inspector", 0, 0, 'i' },
152 { "listen", 0, 0, 0 },
153 { "mount", 1, 0, 'm' },
154 { "new", 1, 0, 'N' },
155 { "no-dest-paths", 0, 0, 'D' },
156 { "no-sync", 0, 0, 'n' },
157 { "remote", 2, 0, 0 },
159 { "selinux", 0, 0, 0 },
160 { "verbose", 0, 0, 'v' },
161 { "version", 0, 0, 'V' },
164 struct drv *drvs = NULL;
166 struct mp *mps = NULL;
168 char *p, *file = NULL;
173 char next_drive = 'a';
174 int next_prepared_drive = 1;
176 initialize_readline ();
178 memset (&sa, 0, sizeof sa);
179 sa.sa_handler = SIG_IGN;
180 sa.sa_flags = SA_RESTART;
181 sigaction (SIGPIPE, &sa, NULL);
183 /* guestfs_create is meant to be a lightweight operation, so
184 * it's OK to do it early here.
186 g = guestfs_create ();
188 fprintf (stderr, _("guestfs_create: failed to create handle\n"));
192 guestfs_set_autosync (g, 1);
194 /* If developing, add ./appliance to the path. Note that libtools
195 * interferes with this because uninstalled guestfish is a shell
196 * script that runs the real program with an absolute path. Detect
199 * BUT if LIBGUESTFS_PATH environment variable is already set by
200 * the user, then don't override it.
202 if (getenv ("LIBGUESTFS_PATH") == NULL &&
204 (argv[0][0] != '/' || strstr (argv[0], "/.libs/lt-") != NULL))
205 guestfs_set_path (g, "appliance:" GUESTFS_DEFAULT_PATH);
207 /* CAUTION: we are careful to modify argv[0] here, only after
208 * using it just above.
210 * getopt_long uses argv[0], so give it the sanitized name. Save a copy
211 * of the original, in case it's needed in virt-inspector mode, below.
213 char *real_argv0 = argv[0];
214 argv[0] = bad_cast (program_name);
217 c = getopt_long (argc, argv, options, long_options, &option_index);
221 case 0: /* options which are long only */
222 if (STREQ (long_options[option_index].name, "listen"))
223 remote_control_listen = 1;
224 else if (STREQ (long_options[option_index].name, "remote")) {
226 if (sscanf (optarg, "%d", &remote_control) != 1) {
227 fprintf (stderr, _("%s: --listen=PID: PID was not a number: %s\n"),
228 program_name, optarg);
232 p = getenv ("GUESTFISH_PID");
233 if (!p || sscanf (p, "%d", &remote_control) != 1) {
234 fprintf (stderr, _("%s: remote: $GUESTFISH_PID must be set"
235 " to the PID of the remote process\n"),
240 } else if (STREQ (long_options[option_index].name, "selinux")) {
241 guestfs_set_selinux (g, 1);
243 fprintf (stderr, _("%s: unknown long option: %s (%d)\n"),
244 program_name, long_options[option_index].name, option_index);
250 if (access (optarg, R_OK) != 0) {
254 drv = malloc (sizeof (struct drv));
259 drv->filename = optarg;
261 /* We could fill the device field in, but in fact we
262 * only use it for the -N option at present.
271 if (STRCASEEQ (optarg, "list")) {
272 list_prepared_drives ();
275 drv = malloc (sizeof (struct drv));
280 if (asprintf (&drv->filename, "test%d.img",
281 next_prepared_drive++) == -1) {
285 drv->data = create_prepared_file (optarg, drv->filename);
286 if (asprintf (&drv->device, "/dev/sd%c", next_drive++) == -1) {
295 complete_dest_paths = 0;
300 fprintf (stderr, _("%s: only one -f parameter can be given\n"),
309 display_command (optarg);
310 else if (argv[optind] && argv[optind][0] != '-')
311 display_command (argv[optind++]);
321 mp = malloc (sizeof (struct mp));
326 p = strchr (optarg, ':');
329 mp->mountpoint = p+1;
331 mp->mountpoint = bad_cast ("/");
338 guestfs_set_autosync (g, 0);
347 guestfs_set_verbose (g, verbose);
351 printf ("%s %s\n", program_name, PACKAGE_VERSION);
355 guestfs_set_trace (g, 1);
359 usage (EXIT_SUCCESS);
362 usage (EXIT_FAILURE);
366 /* Inspector mode invalidates most of the other arguments. */
368 if (drvs || mps || remote_control_listen || remote_control ||
369 guestfs_get_selinux (g)) {
370 fprintf (stderr, _("%s: cannot use -i option with -a, -m, -N, "
371 "--listen, --remote or --selinux\n"),
375 if (optind >= argc) {
377 _("%s: -i requires a libvirt domain or path(s) to disk image(s)\n"),
384 FILE *fp = open_memstream (&cmd, &cmdlen);
386 perror ("open_memstream");
390 fprintf (fp, "virt-inspector");
391 while (optind < argc) {
393 print_shell_quote (fp, argv[optind]);
398 fprintf (fp, " --ro-fish");
400 fprintf (fp, " --fish");
402 if (fclose (fp) == -1) {
409 "%s -i: running: %s\n", program_name, cmd);
411 FILE *pp = popen (cmd, "r");
418 fp = open_memstream (&cmd2, &cmdlen);
420 perror ("open_memstream");
424 fprintf (fp, "%s", real_argv0);
426 if (guestfs_get_verbose (g))
428 if (!guestfs_get_autosync (g))
430 if (guestfs_get_trace (g))
435 if (getline (&insp, &insplen, pp) == -1) {
439 fprintf (fp, " %s", insp);
441 if (pclose (pp) == -1) {
446 if (fclose (fp) == -1) {
453 "%s -i: running: %s\n", program_name, cmd2);
455 int r = system (cmd2);
465 exit (WEXITSTATUS (r));
468 /* If we've got drives to add, add them now. */
471 /* If we've got mountpoints or prepared drives, we must launch the
472 * guest and mount them.
474 if (next_prepared_drive > 1 || mps != NULL) {
475 if (launch () == -1) exit (EXIT_FAILURE);
476 prepare_drives (drvs);
480 /* Remote control? */
481 if (remote_control_listen && remote_control) {
483 _("%s: cannot use --listen and --remote options at the same time\n"),
488 if (remote_control_listen) {
491 _("%s: extra parameters on the command line with --listen flag\n"),
497 _("%s: cannot use --listen and --file options at the same time\n"),
504 /* -f (file) parameter? */
507 if (open (file, O_RDONLY) == -1) {
513 /* Interactive, shell script, or command(s) on the command line? */
514 if (optind >= argc) {
521 cmdline (argv, optind, argc);
529 pod2text (const char *name, const char *shortdesc, const char *str)
533 fp = popen ("pod2text", "w");
535 /* pod2text failed, maybe not found, so let's just print the
536 * source instead, since that's better than doing nothing.
538 printf ("%s - %s\n\n%s\n", name, shortdesc, str);
541 fprintf (fp, "=head1 NAME\n\n%s - %s\n\n", name, shortdesc);
546 /* List is built in reverse order, so mount them in reverse order. */
548 mount_mps (struct mp *mp)
553 mount_mps (mp->next);
555 /* Don't use guestfs_mount here because that will default to mount
556 * options -o sync,noatime. For more information, see guestfs(3)
557 * section "LIBGUESTFS GOTCHAS".
559 const char *options = read_only ? "ro" : "";
560 r = guestfs_mount_options (g, options, mp->device, mp->mountpoint);
567 add_drives (struct drv *drv)
572 add_drives (drv->next);
574 if (drv->data /* -N option is not affected by --ro */ || !read_only)
575 r = guestfs_add_drive (g, drv->filename);
577 r = guestfs_add_drive_ro (g, drv->filename);
584 prepare_drives (struct drv *drv)
587 prepare_drives (drv->next);
589 prepare_drive (drv->filename, drv->data, drv->device);
596 if (guestfs_is_config (g)) {
597 if (guestfs_launch (g) == -1)
615 #define FISH "><fs> "
617 static char *line_read = NULL;
622 #ifdef HAVE_LIBREADLINE
630 line_read = readline (prompt ? FISH : "");
632 if (line_read && *line_read)
633 add_history_line (line_read);
638 #endif /* HAVE_LIBREADLINE */
640 static char buf[8192];
643 if (prompt) printf (FISH);
644 line_read = fgets (buf, sizeof buf, stdin);
647 len = strlen (line_read);
648 if (len > 0 && buf[len-1] == '\n') buf[len-1] = '\0';
662 int global_exit_on_error = !prompt;
667 "Welcome to guestfish, the libguestfs filesystem interactive shell for\n"
668 "editing virtual machine filesystems.\n"
670 "Type: 'help' for a list of commands\n"
671 " 'man' to read the manual\n"
672 " 'quit' to quit the shell\n"
678 exit_on_error = global_exit_on_error;
680 buf = rl_gets (prompt);
686 /* Skip any initial whitespace before the command. */
688 while (*buf && c_isspace (*buf))
693 /* If the next character is '#' then this is a comment. */
694 if (*buf == '#') continue;
696 /* If the next character is '!' then pass the whole lot to system(3). */
704 (WTERMSIG (r) == SIGINT || WTERMSIG (r) == SIGQUIT)) ||
705 WEXITSTATUS (r) != 0)
711 /* If the next character is '-' allow the command to fail without
712 * exiting on error (just for this one command though).
720 /* Get the command (cannot be quoted). */
721 len = strcspn (buf, " \t");
723 if (len == 0) continue;
727 if (buf[len] == '\0') {
734 p += strspn (p, " \t");
736 /* Get the parameters. */
737 while (*p && i < sizeof argv / sizeof argv[0]) {
740 /* Parameters which start with quotes or pipes are treated
741 * specially. Bare parameters are delimited by whitespace.
745 len = strcspn (p, "\"");
746 if (p[len] == '\0') {
747 fprintf (stderr, _("%s: unterminated double quote\n"), program_name);
748 if (exit_on_error) exit (EXIT_FAILURE);
751 if (p[len+1] && (p[len+1] != ' ' && p[len+1] != '\t')) {
753 _("%s: command arguments not separated by whitespace\n"),
755 if (exit_on_error) exit (EXIT_FAILURE);
759 pend = p[len+1] ? &p[len+2] : &p[len+1];
760 } else if (*p == '\'') {
762 len = strcspn (p, "'");
763 if (p[len] == '\0') {
764 fprintf (stderr, _("%s: unterminated single quote\n"), program_name);
765 if (exit_on_error) exit (EXIT_FAILURE);
768 if (p[len+1] && (p[len+1] != ' ' && p[len+1] != '\t')) {
770 _("%s: command arguments not separated by whitespace\n"),
772 if (exit_on_error) exit (EXIT_FAILURE);
776 pend = p[len+1] ? &p[len+2] : &p[len+1];
777 } else if (*p == '|') {
782 } else if (*p == '[') {
786 while (*pend && c != 0) {
787 if (*pend == '[') c++;
788 else if (*pend == ']') c--;
793 _("%s: unterminated \"[...]\" sequence\n"), program_name);
794 if (exit_on_error) exit (EXIT_FAILURE);
797 if (*pend && (*pend != ' ' && *pend != '\t')) {
799 _("%s: command arguments not separated by whitespace\n"),
801 if (exit_on_error) exit (EXIT_FAILURE);
806 } else if (*p != ' ' && *p != '\t') {
807 /* If the first character is a ~ then note that this parameter
808 * is a candidate for ~username expansion. NB this does not
809 * apply to quoted parameters.
811 tilde_candidate = *p == '~';
812 len = strcspn (p, " \t");
819 fprintf (stderr, _("%s: internal error parsing string at '%s'\n"),
824 if (!tilde_candidate)
827 argv[i] = try_tilde_expansion (p);
832 p += strspn (p, " \t");
835 if (i == sizeof argv / sizeof argv[0]) {
836 fprintf (stderr, _("%s: too many arguments\n"), program_name);
837 if (exit_on_error) exit (EXIT_FAILURE);
844 if (issue_command (cmd, argv, pipe) == -1) {
845 if (exit_on_error) exit (EXIT_FAILURE);
850 if (prompt) printf ("\n");
854 cmdline (char *argv[], int optind, int argc)
861 if (optind >= argc) return;
863 cmd = argv[optind++];
864 if (STREQ (cmd, ":")) {
865 fprintf (stderr, _("%s: empty command on command line\n"), program_name);
869 /* Allow -cmd on the command line to mean (temporarily) override
870 * the normal exit on error (RHBZ#578407).
877 params = &argv[optind];
879 /* Search for end of command list or ":" ... */
880 while (optind < argc && STRNEQ (argv[optind], ":"))
883 if (optind == argc) {
884 if (issue_command (cmd, params, NULL) == -1 && exit_on_error)
888 if (issue_command (cmd, params, NULL) == -1 && exit_on_error)
890 cmdline (argv, optind+1, argc);
895 issue_command (const char *cmd, char *argv[], const char *pipecmd)
898 int stdout_saved_fd = -1;
902 /* This counts the commands issued, starting at 1. */
905 /* For | ... commands. Annoyingly we can't use popen(3) here. */
909 if (fflush (stdout) == EOF) {
910 perror ("failed to flush standard output");
914 perror ("pipe failed");
923 if (pid == 0) { /* Child process. */
925 if (dup2 (fd[0], 0) < 0) {
926 perror ("dup2 of stdin failed");
930 r = system (pipecmd);
935 _exit (WEXITSTATUS (r));
938 if ((stdout_saved_fd = dup (1)) < 0) {
939 perror ("failed to dup stdout");
943 if (dup2 (fd[1], 1) < 0) {
944 perror ("failed to dup stdout");
945 close (stdout_saved_fd);
951 for (argc = 0; argv[argc] != NULL; ++argc)
954 /* If --remote was set, then send this command to a remote process. */
956 r = rc_remote (remote_control, cmd, argc, argv, exit_on_error);
958 /* Otherwise execute it locally. */
959 else if (STRCASEEQ (cmd, "help")) {
963 display_command (argv[0]);
966 else if (STRCASEEQ (cmd, "quit") ||
967 STRCASEEQ (cmd, "exit") ||
968 STRCASEEQ (cmd, "q")) {
972 else if (STRCASEEQ (cmd, "alloc") ||
973 STRCASEEQ (cmd, "allocate"))
974 r = do_alloc (cmd, argc, argv);
975 else if (STRCASEEQ (cmd, "echo"))
976 r = do_echo (cmd, argc, argv);
977 else if (STRCASEEQ (cmd, "edit") ||
978 STRCASEEQ (cmd, "vi") ||
979 STRCASEEQ (cmd, "emacs"))
980 r = do_edit (cmd, argc, argv);
981 else if (STRCASEEQ (cmd, "lcd"))
982 r = do_lcd (cmd, argc, argv);
983 else if (STRCASEEQ (cmd, "glob"))
984 r = do_glob (cmd, argc, argv);
985 else if (STRCASEEQ (cmd, "man") ||
986 STRCASEEQ (cmd, "manual"))
987 r = do_man (cmd, argc, argv);
988 else if (STRCASEEQ (cmd, "more") ||
989 STRCASEEQ (cmd, "less"))
990 r = do_more (cmd, argc, argv);
991 else if (STRCASEEQ (cmd, "reopen"))
992 r = do_reopen (cmd, argc, argv);
993 else if (STRCASEEQ (cmd, "sparse"))
994 r = do_sparse (cmd, argc, argv);
995 else if (STRCASEEQ (cmd, "time"))
996 r = do_time (cmd, argc, argv);
998 r = run_action (cmd, argc, argv);
1000 /* Always flush stdout after every command, so that messages, results
1001 * etc appear immediately.
1003 if (fflush (stdout) == EOF) {
1004 perror ("failed to flush standard output");
1010 if (dup2 (stdout_saved_fd, 1) < 0) {
1011 perror ("failed to dup2 standard output");
1014 close (stdout_saved_fd);
1015 if (waitpid (pid, NULL, 0) < 0) {
1016 perror ("waiting for command to complete");
1025 list_builtin_commands (void)
1027 /* help, man and quit should appear at the top */
1028 printf ("%-20s %s\n",
1029 "help", _("display a list of commands or help on a command"));
1030 printf ("%-20s %s\n",
1031 "man", _("read the manual"));
1032 printf ("%-20s %s\n",
1033 "quit", _("quit guestfish"));
1035 printf ("%-20s %s\n",
1036 "alloc", _("allocate an image"));
1037 printf ("%-20s %s\n",
1038 "echo", _("display a line of text"));
1039 printf ("%-20s %s\n",
1040 "edit", _("edit a file in the image"));
1041 printf ("%-20s %s\n",
1042 "lcd", _("local change directory"));
1043 printf ("%-20s %s\n",
1044 "glob", _("expand wildcards in command"));
1045 printf ("%-20s %s\n",
1046 "more", _("view a file in the pager"));
1047 printf ("%-20s %s\n",
1048 "reopen", _("close and reopen libguestfs handle"));
1049 printf ("%-20s %s\n",
1050 "sparse", _("allocate a sparse image file"));
1051 printf ("%-20s %s\n",
1052 "time", _("measure time taken to run command"));
1054 /* actions are printed after this (see list_commands) */
1058 display_builtin_command (const char *cmd)
1060 /* help for actions is auto-generated, see display_command */
1062 if (STRCASEEQ (cmd, "alloc") ||
1063 STRCASEEQ (cmd, "allocate"))
1064 printf (_("alloc - allocate an image\n"
1065 " alloc <filename> <size>\n"
1067 " This creates an empty (zeroed) file of the given size,\n"
1068 " and then adds so it can be further examined.\n"
1070 " For more advanced image creation, see qemu-img utility.\n"
1072 " Size can be specified using standard suffixes, eg. '1M'.\n"
1074 else if (STRCASEEQ (cmd, "echo"))
1075 printf (_("echo - display a line of text\n"
1076 " echo [<params> ...]\n"
1078 " This echos the parameters to the terminal.\n"));
1079 else if (STRCASEEQ (cmd, "edit") ||
1080 STRCASEEQ (cmd, "vi") ||
1081 STRCASEEQ (cmd, "emacs"))
1082 printf (_("edit - edit a file in the image\n"
1083 " edit <filename>\n"
1085 " This is used to edit a file.\n"
1087 " It is the equivalent of (and is implemented by)\n"
1088 " running \"cat\", editing locally, and then \"write\".\n"
1090 " Normally it uses $EDITOR, but if you use the aliases\n"
1091 " \"vi\" or \"emacs\" you will get those editors.\n"
1093 " NOTE: This will not work reliably for large files\n"
1094 " (> 2 MB) or binary files containing \\0 bytes.\n"));
1095 else if (STRCASEEQ (cmd, "lcd"))
1096 printf (_("lcd - local change directory\n"
1097 " lcd <directory>\n"
1099 " Change guestfish's current directory. This command is\n"
1100 " useful if you want to download files to a particular\n"
1102 else if (STRCASEEQ (cmd, "glob"))
1103 printf (_("glob - expand wildcards in command\n"
1104 " glob <command> [<args> ...]\n"
1106 " Glob runs <command> with wildcards expanded in any\n"
1107 " command args. Note that the command is run repeatedly\n"
1108 " once for each expanded argument.\n"));
1109 else if (STRCASEEQ (cmd, "man") ||
1110 STRCASEEQ (cmd, "manual"))
1111 printf (_("man - read the manual\n"
1114 " Opens the manual page for guestfish.\n"));
1115 else if (STRCASEEQ (cmd, "help"))
1116 printf (_("help - display a list of commands or help on a command\n"
1119 else if (STRCASEEQ (cmd, "more") ||
1120 STRCASEEQ (cmd, "less"))
1121 printf (_("more - view a file in the pager\n"
1122 " more <filename>\n"
1124 " This is used to view a file in the pager.\n"
1126 " It is the equivalent of (and is implemented by)\n"
1127 " running \"cat\" and using the pager.\n"
1129 " Normally it uses $PAGER, but if you use the alias\n"
1130 " \"less\" then it always uses \"less\".\n"
1132 " NOTE: This will not work reliably for large files\n"
1133 " (> 2 MB) or binary files containing \\0 bytes.\n"));
1134 else if (STRCASEEQ (cmd, "quit") ||
1135 STRCASEEQ (cmd, "exit") ||
1136 STRCASEEQ (cmd, "q"))
1137 printf (_("quit - quit guestfish\n"
1139 else if (STRCASEEQ (cmd, "reopen"))
1140 printf (_("reopen - close and reopen the libguestfs handle\n"
1143 "Close and reopen the libguestfs handle. It is not necessary to use\n"
1144 "this normally, because the handle is closed properly when guestfish\n"
1145 "exits. However this is occasionally useful for testing.\n"));
1146 else if (STRCASEEQ (cmd, "sparse"))
1147 printf (_("sparse - allocate a sparse image file\n"
1148 " sparse <filename> <size>\n"
1150 " This creates an empty sparse file of the given size,\n"
1151 " and then adds so it can be further examined.\n"
1153 " In all respects it works the same as the 'alloc'\n"
1154 " command, except that the image file is allocated\n"
1155 " sparsely, which means that disk blocks are not assigned\n"
1156 " to the file until they are needed. Sparse disk files\n"
1157 " only use space when written to, but they are slower\n"
1158 " and there is a danger you could run out of real disk\n"
1159 " space during a write operation.\n"
1161 " For more advanced image creation, see qemu-img utility.\n"
1163 " Size can be specified using standard suffixes, eg. '1M'.\n"
1165 else if (STRCASEEQ (cmd, "time"))
1166 printf (_("time - measure time taken to run command\n"
1167 " time <command> [<args> ...]\n"
1169 " This runs <command> as usual, and prints the elapsed\n"
1170 " time afterwards.\n"));
1172 fprintf (stderr, _("%s: command not known, use -h to list all commands\n"),
1176 /* This is printed when the user types in an unknown command for the
1177 * first command issued. A common case is the user doing:
1178 * guestfish disk.img
1179 * expecting guestfish to open 'disk.img' (in fact, this tried to
1180 * run a command 'disk.img').
1183 extended_help_message (void)
1186 _("Did you mean to open a disk image? guestfish -a disk.img\n"
1187 "For a list of commands: guestfish -h\n"
1188 "For complete documentation: man guestfish\n"));
1192 free_strings (char **argv)
1196 for (argc = 0; argv[argc] != NULL; ++argc)
1202 count_strings (char *const *argv)
1206 for (c = 0; argv[c]; ++c)
1212 print_strings (char *const *argv)
1216 for (argc = 0; argv[argc] != NULL; ++argc)
1217 printf ("%s\n", argv[argc]);
1221 print_table (char *const *argv)
1225 for (i = 0; argv[i] != NULL; i += 2)
1226 printf ("%s: %s\n", argv[i], argv[i+1]);
1230 is_true (const char *str)
1233 STRCASENEQ (str, "0") &&
1234 STRCASENEQ (str, "f") &&
1235 STRCASENEQ (str, "false") &&
1236 STRCASENEQ (str, "n") &&
1237 STRCASENEQ (str, "no");
1240 /* Free strings from a non-NULL terminated char** */
1242 free_n_strings (char **str, size_t len)
1246 for (i = 0; i < len; i++) {
1253 parse_string_list (const char *str)
1256 size_t argv_len = 0;
1258 /* Current position pointer */
1259 const char *p = str;
1261 /* Token might be simple:
1264 * 'This is a single token'
1265 * or contain embedded single-quoted sections:
1266 * This' is a sing'l'e to'ken
1268 * The latter may seem over-complicated, but it's what a normal shell does.
1269 * Not doing it risks surprising somebody.
1271 * This outer loop is over complete tokens.
1277 /* Skip leading whitespace */
1278 p += strspn (p, " \t");
1282 /* This loop is over token 'fragments'. A token can be in multiple bits if
1283 * it contains single quotes. We also treat both sides of an escaped quote
1284 * as separate fragments because we can't just copy it: we have to remove
1287 while (*p && (!c_isblank (*p) || in_quote)) {
1288 const char *end = p;
1290 /* Check if the fragment starts with a quote */
1292 /* Toggle in_quote */
1293 in_quote = !in_quote;
1295 /* Skip the quote */
1299 /* If we're in a quote, look for an end quote */
1301 end += strcspn (end, "'");
1304 /* Otherwise, look for whitespace or a quote */
1306 end += strcspn (end, " \t'");
1309 /* Grow the token to accommodate the fragment */
1310 size_t tok_end = tok_len;
1312 char *tok_new = realloc (tok, tok_len + 1);
1313 if (NULL == tok_new) {
1315 free_n_strings (argv, argv_len);
1317 exit (EXIT_FAILURE);
1321 /* Check if we stopped on an escaped quote */
1322 if ('\'' == *end && end != p && *(end-1) == '\\') {
1323 /* Add everything before \' to the token */
1324 memcpy (&tok[tok_end], p, end - p - 1);
1327 tok[tok_len-1] = '\'';
1329 /* Already processed the quote */
1334 /* Add the whole fragment */
1335 memcpy (&tok[tok_end], p, end - p);
1341 /* We've reached the end of a token. We shouldn't still be in quotes. */
1343 fprintf (stderr, _("Runaway quote in string \"%s\"\n"), str);
1345 free_n_strings (argv, argv_len);
1350 /* Add this token if there is one. There might not be if there was
1351 * whitespace at the end of the input string */
1353 /* Add the NULL terminator */
1354 tok[tok_len] = '\0';
1356 /* Add the argument to the argument list */
1358 char **argv_new = realloc (argv, sizeof (*argv) * argv_len);
1359 if (NULL == argv_new) {
1361 free_n_strings (argv, argv_len-1);
1363 exit (EXIT_FAILURE);
1367 argv[argv_len-1] = tok;
1371 /* NULL terminate the argument list */
1373 char **argv_new = realloc (argv, sizeof (*argv) * argv_len);
1374 if (NULL == argv_new) {
1376 free_n_strings (argv, argv_len-1);
1377 exit (EXIT_FAILURE);
1381 argv[argv_len-1] = NULL;
1386 #ifdef HAVE_LIBREADLINE
1387 static char histfile[1024];
1388 static int nr_history_lines = 0;
1392 initialize_readline (void)
1394 #ifdef HAVE_LIBREADLINE
1397 home = getenv ("HOME");
1399 snprintf (histfile, sizeof histfile, "%s/.guestfish", home);
1401 (void) read_history (histfile);
1404 rl_readline_name = "guestfish";
1405 rl_attempted_completion_function = do_completion;
1410 cleanup_readline (void)
1412 #ifdef HAVE_LIBREADLINE
1415 if (histfile[0] != '\0') {
1416 fd = open (histfile, O_WRONLY|O_CREAT, 0644);
1423 #ifdef HAVE_APPEND_HISTORY
1424 (void) append_history (nr_history_lines, histfile);
1426 (void) write_history (histfile);
1432 #ifdef HAVE_LIBREADLINE
1434 add_history_line (const char *line)
1442 xwrite (int fd, const void *v_buf, size_t len)
1445 const char *buf = v_buf;
1448 r = write (fd, buf, len);
1460 /* Resolve the special "win:..." form for Windows-specific paths.
1461 * This always returns a newly allocated string which is freed by the
1462 * caller function in "cmds.c".
1465 resolve_win_path (const char *path)
1470 if (STRCASENEQLEN (path, "win:", 4)) {
1471 ret = strdup (path);
1479 /* Drop drive letter, if it's "C:". */
1480 if (STRCASEEQLEN (path, "c:", 2))
1490 ret = strdup (path);
1496 /* Blindly convert any backslashes into forward slashes. Is this good? */
1497 for (i = 0; i < strlen (ret); ++i)
1501 char *t = guestfs_case_sensitive_path (g, ret);
1508 /* Resolve the special FileIn paths ("-" or "-<<END" or filename).
1509 * The caller (cmds.c) will call free_file_in after the command has
1510 * run which should clean up resources.
1512 static char *file_in_heredoc (const char *endmarker);
1513 static char *file_in_tmpfile = NULL;
1516 file_in (const char *arg)
1520 if (STREQ (arg, "-")) {
1521 ret = strdup ("/dev/stdin");
1527 else if (STRPREFIX (arg, "-<<")) {
1528 const char *endmarker = &arg[3];
1529 if (*endmarker == '\0') {
1530 fprintf (stderr, "%s: missing end marker in -<< expression\n",
1534 ret = file_in_heredoc (endmarker);
1550 file_in_heredoc (const char *endmarker)
1552 static const char template[] = "/tmp/heredocXXXXXX";
1553 file_in_tmpfile = strdup (template);
1554 if (file_in_tmpfile == NULL) {
1559 int fd = mkstemp (file_in_tmpfile);
1565 size_t markerlen = strlen (endmarker);
1567 char buffer[BUFSIZ];
1568 int write_error = 0;
1569 while (fgets (buffer, sizeof buffer, stdin) != NULL) {
1570 /* Look for "END"<EOF> or "END\n" in input. */
1571 size_t blen = strlen (buffer);
1572 if (STREQLEN (buffer, endmarker, markerlen) &&
1573 (blen == markerlen ||
1574 (blen == markerlen+1 && buffer[markerlen] == '\n')))
1577 if (xwrite (fd, buffer, blen) == -1) {
1578 if (!write_error) perror ("write");
1580 /* continue reading up to the end marker */
1584 /* Reached EOF of stdin without finding the end marker, which
1585 * is likely to be an error.
1587 fprintf (stderr, "%s: end of input reached without finding '%s'\n",
1588 program_name, endmarker);
1597 if (close (fd) == -1) {
1602 return file_in_tmpfile;
1605 unlink (file_in_tmpfile);
1608 free (file_in_tmpfile);
1609 file_in_tmpfile = NULL;
1614 free_file_in (char *s)
1616 if (file_in_tmpfile) {
1617 if (unlink (file_in_tmpfile) == -1)
1618 perror (file_in_tmpfile);
1619 file_in_tmpfile = NULL;
1622 /* Free the device or file name which was strdup'd in file_in().
1623 * Note it's not immediately clear, but for -<< heredocs,
1624 * s == file_in_tmpfile, so this frees up that buffer.
1629 /* Resolve the special FileOut paths ("-" or filename).
1630 * The caller (cmds.c) will call free (str) after the command has run.
1633 file_out (const char *arg)
1637 if (STREQ (arg, "-"))
1638 ret = strdup ("/dev/stdout");
1650 print_shell_quote (FILE *stream, const char *str)
1652 #define SAFE(c) (c_isalnum((c)) || \
1653 (c) == '/' || (c) == '-' || (c) == '_' || (c) == '.')
1656 for (i = 0; str[i]; ++i) {
1658 putc ('\\', stream);
1659 putc (str[i], stream);