mirror of
https://github.com/libguestfs/libguestfs.git
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123 lines
3.2 KiB
C
123 lines
3.2 KiB
C
/* libguestfs - the guestfsd daemon
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* Copyright (C) 2013 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 "daemon.h"
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#include "actions.h"
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#include "optgroups.h"
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static int
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e2uuid (const char *device, const char *uuid)
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{
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/* Don't allow the magic values here. If callers want to do this
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* we'll add alternate set_uuid_* calls.
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*/
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if (STREQ (uuid, "clear") || STREQ (uuid, "random") ||
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STREQ (uuid, "time")) {
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reply_with_error ("e2: invalid new UUID");
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return -1;
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}
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return do_set_e2uuid (device, uuid);
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}
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static int
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xfsuuid (const char *device, const char *uuid)
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{
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/* Don't allow special values. */
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if (STREQ (uuid, "nil") || STREQ (uuid, "generate")) {
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reply_with_error ("xfs: invalid new UUID");
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return -1;
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}
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return xfs_set_uuid (device, uuid);
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}
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int
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do_set_uuid (const char *device, const char *uuid)
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{
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/* How we set the UUID depends on the filesystem type. */
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CLEANUP_FREE char *vfs_type = get_blkid_tag (device, "TYPE");
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if (vfs_type == NULL)
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return -1;
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/* Fast path: ext2/3/4 family */
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if (fstype_is_extfs (vfs_type))
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return e2uuid (device, uuid);
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/* Table-driven dispatch — struct + array in one perfect declaration */
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static const struct {
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const char *fs_name;
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int (*setter)(const char *device, const char *uuid);
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} handlers[] = {
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{ "xfs", xfsuuid },
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{ "swap", swap_set_uuid },
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{ "btrfs", btrfs_set_uuid },
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{ NULL, NULL } /* sentinel */
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};
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/* Lookup and call */
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for (size_t i = 0; handlers[i].fs_name; ++i) {
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if (STREQ (vfs_type, handlers[i].fs_name))
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return handlers[i].setter (device, uuid);
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}
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NOT_SUPPORTED (-1,
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"don't know how to set the UUID for '%s' filesystems",
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vfs_type);
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}
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int
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do_set_uuid_random (const char *device)
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{
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int r;
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/* How we set the UUID depends on the filesystem type. */
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CLEANUP_FREE char *vfs_type = get_blkid_tag (device, "TYPE");
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if (vfs_type == NULL)
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return -1;
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CLEANUP_FREE char *uuid_random = get_random_uuid ();
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if (uuid_random == NULL)
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return -1;
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if (fstype_is_extfs (vfs_type))
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r = ext_set_uuid_random (device);
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else if (STREQ (vfs_type, "xfs"))
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r = xfs_set_uuid_random (device);
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else if (STREQ (vfs_type, "swap"))
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r = swap_set_uuid (device, uuid_random);
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else if (STREQ (vfs_type, "btrfs"))
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r = btrfs_set_uuid_random (device);
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else
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NOT_SUPPORTED (-1, "don't know how to set the random UUID for '%s' filesystems",
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vfs_type);
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return r;
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}
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