-/* guestfish - the filesystem shell
+/* guestfish - the filesystem interactive shell
* Copyright (C) 2009 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
+#include <fcntl.h>
#include <getopt.h>
+#include <inttypes.h>
#include <guestfs.h>
#include "fish.h"
+struct mp {
+ struct mp *next;
+ char *device;
+ char *mountpoint;
+};
+
+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 int issue_command (const char *cmd, char *argv[]);
+static int parse_size (const char *str, off_t *size_rtn);
+
+/* Currently open libguestfs handle. */
+guestfs_h *g;
+int g_launched = 0;
+
+int quit = 0;
+int verbose = 0;
+
+int
+launch (void)
+{
+ if (!g_launched) {
+ if (guestfs_launch (g) == -1)
+ return -1;
+ if (guestfs_wait_ready (g) == -1)
+ return -1;
+ g_launched = 1;
+ }
+ return 0;
+}
+
static void
usage (void)
{
"guestfish lets you edit virtual machine filesystems\n"
"Copyright (C) 2009 Red Hat Inc.\n"
"Usage:\n"
- " guestfish [--options] [cmd]\n"
+ " guestfish [--options] cmd [: cmd : cmd ...]\n"
"or for interactive use:\n"
" guestfish\n"
"or from a shell script:\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");
+ " -h|--cmd-help List available commands\n"
+ " -h|--cmd-help cmd Display detailed help on 'cmd'\n"
+ " -a|--add image Add image\n"
+ " -m|--mount dev[:mnt] Mount dev on mnt (if omitted, /)\n"
+ " -n|--no-sync Don't autosync\n"
+ /*" --ro|-r All mounts are read-only\n"*/
+ " -v|--verbose Verbose messages\n"
+ "For more information, see the manpage guestfish(1).\n");
}
int
main (int argc, char *argv[])
{
- static const char *options = "h::?";
+ static const char *options = "a:h::m:v?";
static struct option long_options[] = {
+ { "add", 1, 0, 'a' },
{ "cmd-help", 2, 0, 'h' },
{ "help", 0, 0, '?' },
+ { "mount", 1, 0, 'm' },
+ { "no-sync", 0, 0, 'n' },
+ { "verbose", 0, 0, 'v' },
{ 0, 0, 0, 0 }
};
+ struct mp *mps = NULL;
+ struct mp *mp;
+ char *p;
int c;
+ /* 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 . 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.
+ */
+ if (argv[0] &&
+ (argv[0][0] != '/' || strstr (argv[0], "/.libs/lt-") != NULL))
+ guestfs_set_path (g, ".:" GUESTFS_DEFAULT_PATH);
+
for (;;) {
c = getopt_long (argc, argv, options, long_options, NULL);
if (c == -1) break;
switch (c) {
+ case 'a':
+ if (access (optarg, R_OK) != 0) {
+ perror (optarg);
+ exit (1);
+ }
+ if (guestfs_add_drive (g, optarg) == -1)
+ exit (1);
+ break;
+
case 'h':
if (optarg)
display_command (optarg);
list_commands ();
exit (0);
+ 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 = "/";
+ mp->device = optarg;
+ mp->next = mps;
+ mps = mp;
+ break;
+
+ case 'n':
+ guestfs_set_autosync (g, 0);
+ break;
+
+ case 'v':
+ verbose++;
+ guestfs_set_verbose (g, verbose);
+ break;
+
case '?':
usage ();
exit (0);
}
}
- if (optind < argc) {
- usage ();
- exit (1);
+ /* If we've got mountpoints, we must launch the guest and mount them. */
+ if (mps != NULL) {
+ if (launch () == -1) exit (1);
+ mount_mps (mps);
}
-
-
-
-
-
-
-
-
-
-
+ /* 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);
exit (0);
}
fputs (str, fp);
pclose (fp);
}
+
+/* List is built in reverse order, so mount them in reverse order. */
+static void
+mount_mps (struct mp *mp)
+{
+ if (mp) {
+ mount_mps (mp->next);
+ if (guestfs_mount (g, mp->device, mp->mountpoint) == -1)
+ exit (1);
+ }
+}
+
+static void
+interactive (void)
+{
+ script (1);
+}
+
+static void
+shell_script (void)
+{
+ script (0);
+}
+
+static void
+script (int prompt)
+{
+ char buf[8192];
+ char *cmd;
+ char *argv[64];
+ int len, i;
+
+ 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) {
+ if (prompt) printf ("><fs> ");
+ if (fgets (buf, sizeof buf, stdin) == NULL) {
+ quit = 1;
+ break;
+ }
+
+ len = strlen (buf);
+ if (len > 0 && buf[len-1] == '\n') buf[len-1] = '\0';
+
+ /* Split the buffer up at whitespace. */
+ cmd = strtok (buf, " \t");
+ if (cmd == NULL)
+ continue;
+
+ i = 0;
+ while (i < sizeof argv / sizeof argv[0] &&
+ (argv[i] = strtok (NULL, " \t")) != NULL)
+ i++;
+ if (i == sizeof argv / sizeof argv[0]) {
+ fprintf (stderr, "guestfish: too many arguments in command\n");
+ exit (1);
+ }
+
+ if (issue_command (cmd, argv) == -1) {
+ if (!prompt) exit (1);
+ }
+ }
+ if (prompt) printf ("\n");
+}
+
+static void
+cmdline (char *argv[], int optind, int argc)
+{
+ const char *cmd;
+ char **params;
+
+ if (optind >= argc) return;
+
+ cmd = argv[optind++];
+ if (strcmp (cmd, ":") == 0) {
+ fprintf (stderr, "guestfish: empty command on command line\n");
+ 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) == -1) exit (1);
+ } else {
+ argv[optind] = NULL;
+ if (issue_command (cmd, params) == -1) exit (1);
+ cmdline (argv, optind+1, argc);
+ }
+}
+
+static int
+issue_command (const char *cmd, char *argv[])
+{
+ int argc;
+
+ for (argc = 0; argv[argc] != NULL; ++argc)
+ ;
+
+ if (strcasecmp (cmd, "help") == 0) {
+ if (argc == 0)
+ list_commands ();
+ else
+ display_command (argv[0]);
+ return 0;
+ }
+ else if (strcasecmp (cmd, "quit") == 0 ||
+ strcasecmp (cmd, "exit") == 0 ||
+ strcasecmp (cmd, "q") == 0) {
+ quit = 1;
+ return 0;
+ }
+ else if (strcasecmp (cmd, "add") == 0 ||
+ strcasecmp (cmd, "drive") == 0 ||
+ strcasecmp (cmd, "add-drive") == 0 ||
+ strcasecmp (cmd, "add_drive") == 0) {
+ if (argc != 1) {
+ fprintf (stderr, "use 'add image' to add a guest image\n");
+ return -1;
+ }
+ else
+ return guestfs_add_drive (g, argv[0]);
+ }
+ else if (strcasecmp (cmd, "cdrom") == 0 ||
+ strcasecmp (cmd, "add-cdrom") == 0 ||
+ strcasecmp (cmd, "add_cdrom") == 0) {
+ if (argc != 1) {
+ fprintf (stderr, "use 'cdrom image' to add a CD-ROM image\n");
+ return -1;
+ }
+ else
+ return guestfs_add_cdrom (g, argv[0]);
+ }
+ else if (strcasecmp (cmd, "alloc") == 0 ||
+ strcasecmp (cmd, "allocate") == 0) {
+ if (argc != 2) {
+ fprintf (stderr, "use 'alloc file size' to create an image\n");
+ return -1;
+ }
+ else {
+ off_t size;
+ int fd;
+
+ if (parse_size (argv[1], &size) == -1)
+ return -1;
+
+ if (g_launched) {
+ fprintf (stderr, "can't allocate or add disks after launching\n");
+ return -1;
+ }
+
+ fd = open (argv[0], O_WRONLY|O_CREAT|O_NOCTTY|O_NONBLOCK|O_TRUNC, 0666);
+ if (fd == -1) {
+ perror (argv[0]);
+ return -1;
+ }
+
+ if (posix_fallocate (fd, 0, size) == -1) {
+ perror ("fallocate");
+ close (fd);
+ unlink (argv[0]);
+ return -1;
+ }
+
+ if (close (fd) == -1) {
+ perror (argv[0]);
+ unlink (argv[0]);
+ return -1;
+ }
+
+ if (guestfs_add_drive (g, argv[0]) == -1) {
+ unlink (argv[0]);
+ return -1;
+ }
+
+ return 0;
+ }
+ }
+ else if (strcasecmp (cmd, "launch") == 0 ||
+ strcasecmp (cmd, "run") == 0) {
+ if (argc != 0) {
+ fprintf (stderr, "'launch' command takes no parameters\n");
+ return -1;
+ }
+ else
+ return launch ();
+ }
+ else
+ return run_action (cmd, argc, argv);
+}
+
+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");
+
+ /* then the non-actions, in alphabetical order */
+ printf ("%-20s %s\n",
+ "add", "add a guest image to be examined or modified");
+ printf ("%-20s %s\n",
+ "alloc", "allocate an image");
+ printf ("%-20s %s\n",
+ "cdrom", "add a CD-ROM image to be examined");
+ printf ("%-20s %s\n",
+ "launch", "launch the subprocess");
+
+ /* 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, "add") == 0)
+ printf ("add - add a guest image to be examined or modified\n"
+ " add <image>\n");
+ else if (strcasecmp (cmd, "alloc") == 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, "cdrom") == 0)
+ printf ("cdrom - add a CD-ROM image to be examined\n"
+ " cdrom <iso-file>\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, "quit") == 0)
+ printf ("quit - quit guestfish\n"
+ " quit\n");
+ else if (strcasecmp (cmd, "launch") == 0)
+ printf ("launch - launch the subprocess\n"
+ " launch\n");
+ else
+ fprintf (stderr, "%s: command not known, use -h to list all commands\n",
+ cmd);
+}
+
+/* Parse size parameter of alloc command. */
+static int
+parse_size (const char *str, off_t *size_rtn)
+{
+ uint64_t size;
+ char type;
+
+ /* Note that the parsing here is looser than what is specified in the
+ * help, but we may tighten it up in future so beware.
+ */
+ if (sscanf (str, "%"SCNu64"%c", &size, &type) == 2) {
+ switch (type) {
+ case 'k': case 'K': size *= 1024; break;
+ case 'm': case 'M': size *= 1024 * 1024; break;
+ case 'g': case 'G': size *= 1024 * 1024 * 1024; break;
+ case 's': size *= 512; break;
+ default:
+ fprintf (stderr, "could not parse size specification '%s'\n", str);
+ return -1;
+ }
+ }
+ else if (sscanf (str, "%"SCNu64, &size) == 1)
+ size *= 1024;
+ else {
+ fprintf (stderr, "could not parse size specification '%s'\n", str);
+ return -1;
+ }
+
+ printf ("size = %lu\n", size);
+
+ /* XXX 32 bit file offsets, if anyone uses them? GCC should give
+ * a warning here anyhow.
+ */
+ *size_rtn = size;
+
+ return 0;
+}
+
+void
+free_strings (char **argv)
+{
+ int argc;
+
+ for (argc = 0; argv[argc] != NULL; ++argc)
+ free (argv[argc]);
+ free (argv);
+}
+
+void
+print_strings (char **argv)
+{
+ int argc;
+
+ for (argc = 0; argv[argc] != NULL; ++argc)
+ printf ("%s\n", argv[argc]);
+}