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480 lines
9.5 KiB
C
480 lines
9.5 KiB
C
/* libguestfs - the guestfsd daemon
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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 <inttypes.h>
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#include <string.h>
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#include <unistd.h>
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#include "guestfs_protocol.h"
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#include "daemon.h"
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#include "c-ctype.h"
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#include "actions.h"
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/* Confirmed this is true up to ext4 from the Linux sources. */
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#define EXT2_LABEL_MAX 16
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/* Choose which tools like mke2fs to use. For RHEL 5 (only) there
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* is a special set of tools which support ext2/3/4. eg. On RHEL 5,
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* mke2fs only supports ext2/3, but mke4fs supports ext2/3/4.
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*
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* We specify e4fsprogs in the package list to ensure it is loaded
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* if it exists.
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*/
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static int
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e2prog (char *name)
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{
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char *p = strstr (name, "e2");
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if (!p) return 0;
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p++;
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*p = '4';
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if (prog_exists (name))
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return 0;
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*p = '2';
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if (prog_exists (name))
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return 0;
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reply_with_error ("cannot find required program %s", name);
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return -1;
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}
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char **
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do_tune2fs_l (const char *device)
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{
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int r;
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char *out, *err;
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char *p, *pend, *colon;
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char **ret = NULL;
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int size = 0, alloc = 0;
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char prog[] = "tune2fs";
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if (e2prog (prog) == -1)
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return NULL;
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r = command (&out, &err, prog, "-l", device, NULL);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (err);
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free (out);
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return NULL;
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}
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free (err);
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p = out;
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/* Discard the first line if it contains "tune2fs ...". */
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if (STRPREFIX (p, "tune2fs ") || STRPREFIX (p, "tune4fs ")) {
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p = strchr (p, '\n');
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if (p) p++;
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else {
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reply_with_error ("truncated output");
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free (out);
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return NULL;
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}
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}
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/* Read the lines and split into "key: value". */
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while (*p) {
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pend = strchrnul (p, '\n');
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if (*pend == '\n') {
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*pend = '\0';
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pend++;
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}
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if (!*p) continue;
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colon = strchr (p, ':');
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if (colon) {
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*colon = '\0';
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do { colon++; } while (*colon && c_isspace (*colon));
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if (add_string (&ret, &size, &alloc, p) == -1) {
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free (out);
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return NULL;
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}
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if (STREQ (colon, "<none>") ||
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STREQ (colon, "<not available>") ||
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STREQ (colon, "(none)")) {
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if (add_string (&ret, &size, &alloc, "") == -1) {
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free (out);
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return NULL;
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}
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} else {
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if (add_string (&ret, &size, &alloc, colon) == -1) {
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free (out);
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return NULL;
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}
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}
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}
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else {
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if (add_string (&ret, &size, &alloc, p) == -1) {
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free (out);
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return NULL;
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}
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if (add_string (&ret, &size, &alloc, "") == -1) {
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free (out);
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return NULL;
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}
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}
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p = pend;
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}
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free (out);
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if (add_string (&ret, &size, &alloc, NULL) == -1)
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return NULL;
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return ret;
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}
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int
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do_set_e2label (const char *device, const char *label)
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{
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int r;
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char *err;
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char prog[] = "e2label";
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if (e2prog (prog) == -1)
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return -1;
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if (strlen (label) > EXT2_LABEL_MAX) {
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reply_with_error ("%s: ext2 labels are limited to %d bytes",
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label, EXT2_LABEL_MAX);
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return -1;
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}
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r = command (NULL, &err, prog, device, label, NULL);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (err);
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return -1;
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}
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free (err);
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return 0;
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}
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char *
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do_get_e2label (const char *device)
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{
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return do_vfs_label (device);
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}
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int
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do_set_e2uuid (const char *device, const char *uuid)
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{
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int r;
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char *err;
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char prog[] = "tune2fs";
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if (e2prog (prog) == -1)
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return -1;
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r = command (NULL, &err, prog, "-U", uuid, device, NULL);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (err);
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return -1;
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}
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free (err);
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return 0;
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}
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char *
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do_get_e2uuid (const char *device)
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{
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return do_vfs_uuid (device);
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}
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int
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do_resize2fs (const char *device)
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{
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char *err;
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int r;
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char prog[] = "resize2fs";
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if (e2prog (prog) == -1)
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return -1;
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r = command (NULL, &err, prog, device, NULL);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (err);
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return -1;
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}
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free (err);
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return 0;
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}
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int
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do_resize2fs_size (const char *device, int64_t size)
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{
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char *err;
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int r;
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char prog[] = "resize2fs";
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if (e2prog (prog) == -1)
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return -1;
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/* resize2fs itself may impose additional limits. Since we are
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* going to use the 'K' suffix however we can only work with whole
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* kilobytes.
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*/
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if (size & 1023) {
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reply_with_error ("%" PRIi64 ": size must be a round number of kilobytes",
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size);
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return -1;
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}
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size /= 1024;
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char buf[32];
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snprintf (buf, sizeof buf, "%" PRIi64 "K", size);
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r = command (NULL, &err, prog, device, buf, NULL);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (err);
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return -1;
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}
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free (err);
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return 0;
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}
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int
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do_e2fsck_f (const char *device)
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{
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char *err;
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int r;
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char prog[] = "e2fsck";
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if (e2prog (prog) == -1)
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return -1;
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/* 0 = no errors, 1 = errors corrected.
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*
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* >= 4 means uncorrected or other errors.
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*
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* 2, 3 means errors were corrected and we require a reboot. This is
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* a difficult corner case.
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*/
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r = commandr (NULL, &err, prog, "-p", "-f", device, NULL);
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if (r == -1 || r >= 2) {
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reply_with_error ("%s", err);
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free (err);
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return -1;
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}
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free (err);
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return 0;
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}
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int
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do_mke2journal (int blocksize, const char *device)
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{
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char *err;
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int r;
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char prog[] = "mke2fs";
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if (e2prog (prog) == -1)
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return -1;
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char blocksize_s[32];
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snprintf (blocksize_s, sizeof blocksize_s, "%d", blocksize);
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r = command (NULL, &err,
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prog, "-O", "journal_dev", "-b", blocksize_s,
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device, NULL);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (err);
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return -1;
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}
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free (err);
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return 0;
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}
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int
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do_mke2journal_L (int blocksize, const char *label, const char *device)
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{
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char *err;
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int r;
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char prog[] = "mke2fs";
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if (e2prog (prog) == -1)
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return -1;
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if (strlen (label) > EXT2_LABEL_MAX) {
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reply_with_error ("%s: ext2 labels are limited to %d bytes",
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label, EXT2_LABEL_MAX);
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return -1;
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}
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char blocksize_s[32];
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snprintf (blocksize_s, sizeof blocksize_s, "%d", blocksize);
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r = command (NULL, &err,
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prog, "-O", "journal_dev", "-b", blocksize_s,
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"-L", label,
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device, NULL);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (err);
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return -1;
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}
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free (err);
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return 0;
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}
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int
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do_mke2journal_U (int blocksize, const char *uuid, const char *device)
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{
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char *err;
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int r;
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char prog[] = "mke2fs";
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if (e2prog (prog) == -1)
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return -1;
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char blocksize_s[32];
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snprintf (blocksize_s, sizeof blocksize_s, "%d", blocksize);
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r = command (NULL, &err,
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prog, "-O", "journal_dev", "-b", blocksize_s,
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"-U", uuid,
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device, NULL);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (err);
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return -1;
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}
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free (err);
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return 0;
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}
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int
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do_mke2fs_J (const char *fstype, int blocksize, const char *device,
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const char *journal)
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{
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char *err;
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int r;
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char prog[] = "mke2fs";
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if (e2prog (prog) == -1)
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return -1;
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char blocksize_s[32];
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snprintf (blocksize_s, sizeof blocksize_s, "%d", blocksize);
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int len = strlen (journal);
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char jdev[len+32];
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snprintf (jdev, len+32, "device=%s", journal);
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r = command (NULL, &err,
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prog, "-t", fstype, "-J", jdev, "-b", blocksize_s,
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device, NULL);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (err);
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return -1;
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}
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free (err);
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return 0;
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}
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int
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do_mke2fs_JL (const char *fstype, int blocksize, const char *device,
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const char *label)
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{
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char *err;
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int r;
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char prog[] = "mke2fs";
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if (e2prog (prog) == -1)
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return -1;
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if (strlen (label) > EXT2_LABEL_MAX) {
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reply_with_error ("%s: ext2 labels are limited to %d bytes",
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label, EXT2_LABEL_MAX);
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return -1;
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}
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char blocksize_s[32];
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snprintf (blocksize_s, sizeof blocksize_s, "%d", blocksize);
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int len = strlen (label);
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char jdev[len+32];
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snprintf (jdev, len+32, "device=LABEL=%s", label);
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r = command (NULL, &err,
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prog, "-t", fstype, "-J", jdev, "-b", blocksize_s,
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device, NULL);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (err);
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return -1;
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}
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free (err);
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return 0;
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}
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int
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do_mke2fs_JU (const char *fstype, int blocksize, const char *device,
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const char *uuid)
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{
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char *err;
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int r;
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char prog[] = "mke2fs";
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if (e2prog (prog) == -1)
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return -1;
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char blocksize_s[32];
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snprintf (blocksize_s, sizeof blocksize_s, "%d", blocksize);
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int len = strlen (uuid);
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char jdev[len+32];
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snprintf (jdev, len+32, "device=UUID=%s", uuid);
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r = command (NULL, &err,
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prog, "-t", fstype, "-J", jdev, "-b", blocksize_s,
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device, NULL);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (err);
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return -1;
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}
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free (err);
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return 0;
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}
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