mirror of
https://github.com/libguestfs/libguestfs.git
synced 2026-03-21 22:53:37 +00:00
402 lines
9.1 KiB
C
402 lines
9.1 KiB
C
/* guestfish - the filesystem interactive shell
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* Copyright (C) 2009 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <guestfs.h>
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#include "fish.h"
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struct mp {
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struct mp *next;
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char *device;
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char *mountpoint;
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};
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static void mount_mps (struct mp *mp);
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static void interactive (void);
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static void shell_script (void);
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static void script (int prompt);
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static void cmdline (char *argv[], int optind, int argc);
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static int issue_command (const char *cmd, char *argv[]);
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/* Currently open libguestfs handle. */
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guestfs_h *g;
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int g_launched = 0;
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int quit = 0;
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int verbose = 0;
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int
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launch (void)
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{
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if (!g_launched) {
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if (guestfs_launch (g) == -1)
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return -1;
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if (guestfs_wait_ready (g) == -1)
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return -1;
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g_launched = 1;
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}
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return 0;
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}
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static void
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usage (void)
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{
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fprintf (stderr,
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"guestfish: guest filesystem shell\n"
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"guestfish lets you edit virtual machine filesystems\n"
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"Copyright (C) 2009 Red Hat Inc.\n"
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"Usage:\n"
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" guestfish [--options] cmd [: cmd : cmd ...]\n"
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"or for interactive use:\n"
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" guestfish\n"
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"or from a shell script:\n"
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" guestfish <<EOF\n"
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" cmd\n"
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" ...\n"
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" EOF\n"
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"Options:\n"
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" -h|--cmd-help List available commands\n"
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" -h|--cmd-help cmd Display detailed help on 'cmd'\n"
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" -a|--add image Add image\n"
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" -m|--mount dev[:mnt] Mount dev on mnt (if omitted, /)\n"
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" -n|--no-sync Don't autosync\n"
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/*" --ro|-r All mounts are read-only\n"*/
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" -v|--verbose Verbose messages\n"
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"For more information, see the manpage guestfish(1).\n");
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}
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int
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main (int argc, char *argv[])
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{
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static const char *options = "a:h::m:v?";
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static struct option long_options[] = {
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{ "add", 1, 0, 'a' },
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{ "cmd-help", 2, 0, 'h' },
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{ "help", 0, 0, '?' },
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{ "mount", 1, 0, 'm' },
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{ "no-sync", 0, 0, 'n' },
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{ "verbose", 0, 0, 'v' },
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{ 0, 0, 0, 0 }
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};
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struct mp *mps = NULL;
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struct mp *mp;
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char *p;
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int c;
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/* guestfs_create is meant to be a lightweight operation, so
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* it's OK to do it early here.
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*/
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g = guestfs_create ();
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if (g == NULL) {
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fprintf (stderr, "guestfs_create: failed to create handle\n");
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exit (1);
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}
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guestfs_set_autosync (g, 1);
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for (;;) {
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c = getopt_long (argc, argv, options, long_options, NULL);
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if (c == -1) break;
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switch (c) {
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case 'a':
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if (access (optarg, R_OK) != 0) {
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perror (optarg);
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exit (1);
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}
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if (guestfs_add_drive (g, optarg) == -1)
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exit (1);
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break;
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case 'h':
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if (optarg)
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display_command (optarg);
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else if (argv[optind] && argv[optind][0] != '-')
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display_command (argv[optind++]);
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else
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list_commands ();
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exit (0);
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case 'm':
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mp = malloc (sizeof (struct mp));
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if (!mp) {
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perror ("malloc");
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exit (1);
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}
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p = strchr (optarg, ':');
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if (p) {
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*p = '\0';
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mp->mountpoint = p+1;
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} else
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mp->mountpoint = "/";
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mp->device = optarg;
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mp->next = mps;
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mps = mp->next;
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break;
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case 'n':
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guestfs_set_autosync (g, 0);
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break;
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case 'v':
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verbose++;
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guestfs_set_verbose (g, verbose);
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break;
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case '?':
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usage ();
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exit (0);
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default:
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fprintf (stderr, "guestfish: unexpected command line option 0x%x\n", c);
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exit (1);
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}
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}
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/* If we've got mountpoints, we must launch the guest and mount them. */
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if (mps != NULL) {
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if (launch () == -1) exit (1);
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mount_mps (mps);
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}
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/* Interactive, shell script, or command(s) on the command line? */
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if (optind >= argc) {
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if (isatty (0))
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interactive ();
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else
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shell_script ();
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}
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else
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cmdline (argv, optind, argc);
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exit (0);
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}
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void
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pod2text (const char *heading, const char *str)
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{
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FILE *fp;
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fp = popen ("pod2text", "w");
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if (fp == NULL) {
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/* pod2text failed, maybe not found, so let's just print the
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* source instead, since that's better than doing nothing.
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*/
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printf ("%s\n\n%s\n", heading, str);
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return;
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}
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fputs ("=head1 ", fp);
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fputs (heading, fp);
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fputs ("\n\n", fp);
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fputs (str, fp);
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pclose (fp);
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}
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/* List is built in reverse order, so mount them in reverse order. */
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static void
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mount_mps (struct mp *mp)
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{
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if (mp) {
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mount_mps (mp->next);
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if (guestfs_mount (g, mp->device, mp->mountpoint) == -1)
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exit (1);
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}
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}
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static void
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interactive (void)
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{
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script (1);
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}
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static void
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shell_script (void)
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{
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script (0);
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}
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static void
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script (int prompt)
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{
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char buf[8192];
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char *cmd;
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char *argv[64];
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int len, i;
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if (prompt)
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printf ("\n"
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"Welcome to guestfish, the libguestfs filesystem interactive shell for\n"
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"editing virtual machine filesystems.\n"
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"\n"
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"Type: 'help' for help with commands\n"
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" 'quit' to quit the shell\n"
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"\n");
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while (!quit) {
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if (prompt) printf ("><fs> ");
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if (fgets (buf, sizeof buf, stdin) == NULL) {
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quit = 1;
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break;
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}
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len = strlen (buf);
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if (len > 0 && buf[len-1] == '\n') buf[len-1] = '\0';
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/* Split the buffer up at whitespace. */
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cmd = strtok (buf, " \t");
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if (cmd == NULL)
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continue;
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i = 0;
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while (i < sizeof argv / sizeof argv[0] &&
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(argv[i] = strtok (NULL, " \t")) != NULL)
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i++;
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if (i == sizeof argv / sizeof argv[0]) {
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fprintf (stderr, "guestfish: too many arguments in command\n");
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exit (1);
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}
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(void) issue_command (cmd, argv);
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}
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if (prompt) printf ("\n");
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}
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static void
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cmdline (char *argv[], int optind, int argc)
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{
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const char *cmd;
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char **params;
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if (optind >= argc) return;
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cmd = argv[optind++];
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if (strcmp (cmd, ":") == 0) {
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fprintf (stderr, "guestfish: empty command on command line\n");
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exit (1);
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}
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params = &argv[optind];
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/* Search for end of command list or ":" ... */
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while (optind < argc && strcmp (argv[optind], ":") != 0)
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optind++;
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if (optind == argc) {
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if (issue_command (cmd, params) == -1) exit (1);
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} else {
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argv[optind] = NULL;
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if (issue_command (cmd, params) == -1) exit (1);
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cmdline (argv, optind+1, argc);
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}
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}
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static int
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issue_command (const char *cmd, char *argv[])
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{
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int argc;
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for (argc = 0; argv[argc] != NULL; ++argc)
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;
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if (strcasecmp (cmd, "help") == 0) {
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if (argc == 0)
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list_commands ();
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else
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display_command (argv[0]);
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return 0;
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}
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else if (strcasecmp (cmd, "quit") == 0 ||
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strcasecmp (cmd, "exit") == 0 ||
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strcasecmp (cmd, "q") == 0)
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exit (0);
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else if (strcasecmp (cmd, "add") == 0 ||
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strcasecmp (cmd, "drive") == 0 ||
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strcasecmp (cmd, "add_drive") == 0) {
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if (argc != 1) {
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fprintf (stderr, "use 'add image' to add a guest image\n");
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return -1;
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}
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else
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return guestfs_add_drive (g, argv[0]);
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}
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else if (strcasecmp (cmd, "cdrom") == 0) {
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if (argc != 1) {
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fprintf (stderr, "use 'cdrom image' to add a CD-ROM image\n");
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return -1;
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}
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else
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return guestfs_add_cdrom (g, argv[0]);
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}
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else if (strcasecmp (cmd, "launch") == 0) {
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if (argc != 0) {
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fprintf (stderr, "'launch' command takes no parameters\n");
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return -1;
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}
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else
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return launch ();
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}
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else
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return run_action (cmd, argc, argv);
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}
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void
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list_builtin_commands (void)
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{
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printf ("%-20s %s\n",
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"help", "display a list of commands or help on a command");
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printf ("%-20s %s\n",
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"quit", "quit guestfish");
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printf ("%-20s %s\n",
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"add", "add a guest image to be examined or modified");
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printf ("%-20s %s\n",
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"cdrom", "add a CD-ROM image to be examined");
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printf ("%-20s %s\n",
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"launch", "launch the subprocess");
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}
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void
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display_builtin_command (const char *cmd)
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{
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if (strcasecmp (cmd, "add") == 0)
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printf ("add - add a guest image to be examined or modified\n"
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" add <image>\n");
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else if (strcasecmp (cmd, "cdrom") == 0)
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printf ("cdrom - add a CD-ROM image to be examined\n"
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" cdrom <iso-file>\n");
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else if (strcasecmp (cmd, "help") == 0)
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printf ("help - display a list of commands or help on a command\n"
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" help cmd\n"
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" help\n");
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else if (strcasecmp (cmd, "quit") == 0)
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printf ("quit - quit guestfish\n"
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" quit\n");
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else if (strcasecmp (cmd, "launch") == 0)
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printf ("launch - launch the subprocess\n"
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" launch\n");
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else
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fprintf (stderr, "%s: command not known, use -h to list all commands\n",
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cmd);
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}
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