Deleting the temp snapshot isn't immediately possible because it's the origin of the newly imported boot environment. However, this is trivially solved by opening the new boot environment and promoting it. The roles are now reversed and the temp snapshot/dataset may be completely destroyed. Remove the BUGS from libbe(3) and bectl(8).
972 lines
24 KiB
C
972 lines
24 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
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* Copyright (c) 2017 Kyle J. Kneitinger <kyle@kneit.in>
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* All rights reserved.
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*
|
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* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
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* are met:
|
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* 1. Redistributions of source code must retain the above copyright
|
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
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*
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|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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|
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <ctype.h>
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#include <kenv.h>
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#include <libgen.h>
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#include <libzfs_core.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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|
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|
#include "be.h"
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|
#include "be_impl.h"
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|
|
|
#if SOON
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static int be_create_child_noent(libbe_handle_t *lbh, const char *active,
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const char *child_path);
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static int be_create_child_cloned(libbe_handle_t *lbh, const char *active);
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#endif
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|
|
|
/*
|
|
* Iterator function for locating the rootfs amongst the children of the
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* zfs_be_root set by loader(8). data is expected to be a libbe_handle_t *.
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|
*/
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|
static int
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|
be_locate_rootfs(zfs_handle_t *chkds, void *data)
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|
{
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|
libbe_handle_t *lbh;
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char *mntpoint;
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|
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|
lbh = (libbe_handle_t *)data;
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if (lbh == NULL)
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return (1);
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|
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if (zfs_is_mounted(chkds, &mntpoint) && strcmp(mntpoint, "/") == 0) {
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strncpy(lbh->rootfs, zfs_get_name(chkds), BE_MAXPATHLEN);
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return (1);
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}
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|
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|
return (0);
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|
}
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|
|
/*
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|
* Initializes the libbe context to operate in the root boot environment
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* dataset, for example, zroot/ROOT.
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|
*/
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|
libbe_handle_t *
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libbe_init(void)
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|
{
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|
struct stat sb;
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dev_t root_dev, boot_dev;
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|
libbe_handle_t *lbh;
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zfs_handle_t *rootds;
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char *poolname, *pos;
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int pnamelen;
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|
lbh = NULL;
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poolname = pos = NULL;
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pnamelen = 0;
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rootds = NULL;
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|
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/* Verify that /boot and / are mounted on the same filesystem */
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/* TODO: use errno here?? */
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if (stat("/", &sb) != 0)
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goto err;
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|
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|
root_dev = sb.st_dev;
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|
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|
if (stat("/boot", &sb) != 0)
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goto err;
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|
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|
boot_dev = sb.st_dev;
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|
|
|
if (root_dev != boot_dev) {
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fprintf(stderr, "/ and /boot not on same device, quitting\n");
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|
goto err;
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|
}
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|
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|
if ((lbh = calloc(1, sizeof(libbe_handle_t))) == NULL)
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goto err;
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|
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|
if ((lbh->lzh = libzfs_init()) == NULL)
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goto err;
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|
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/* Obtain path to boot environment root */
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if ((kenv(KENV_GET, "zfs_be_root", lbh->root, BE_MAXPATHLEN)) == -1)
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goto err;
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/* Remove leading 'zfs:' if present, otherwise use value as-is */
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if (strcmp(lbh->root, "zfs:") == 0)
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strncpy(lbh->root, strchr(lbh->root, ':') + sizeof(char),
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BE_MAXPATHLEN);
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|
if ((pos = strchr(lbh->root, '/')) == NULL)
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goto err;
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|
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|
pnamelen = pos - lbh->root;
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poolname = malloc(pnamelen + 1);
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if (poolname == NULL)
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goto err;
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|
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|
strncpy(poolname, lbh->root, pnamelen);
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poolname[pnamelen] = '\0';
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if ((lbh->active_phandle = zpool_open(lbh->lzh, poolname)) == NULL)
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goto err;
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|
|
|
if (zpool_get_prop(lbh->active_phandle, ZPOOL_PROP_BOOTFS, lbh->bootfs,
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|
BE_MAXPATHLEN, NULL, true) != 0)
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|
goto err;
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|
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|
/* Obtain path to boot environment rootfs (currently booted) */
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|
/* XXX Get dataset mounted at / by kenv/GUID from mountroot? */
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|
if ((rootds = zfs_open(lbh->lzh, lbh->root, ZFS_TYPE_DATASET)) == NULL)
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goto err;
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|
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|
zfs_iter_filesystems(rootds, be_locate_rootfs, lbh);
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zfs_close(rootds);
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rootds = NULL;
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|
if (*lbh->rootfs == '\0')
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goto err;
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|
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|
return (lbh);
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|
err:
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|
if (lbh != NULL) {
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if (lbh->active_phandle != NULL)
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zpool_close(lbh->active_phandle);
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if (lbh->lzh != NULL)
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libzfs_fini(lbh->lzh);
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free(lbh);
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}
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if (rootds != NULL)
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zfs_close(rootds);
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free(poolname);
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|
return (NULL);
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}
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|
|
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|
/*
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|
* Free memory allocated by libbe_init()
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|
*/
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|
void
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libbe_close(libbe_handle_t *lbh)
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|
{
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|
|
|
if (lbh->active_phandle != NULL)
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|
zpool_close(lbh->active_phandle);
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libzfs_fini(lbh->lzh);
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|
free(lbh);
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}
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|
/*
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|
* Proxy through to libzfs for the moment.
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*/
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void
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be_nicenum(uint64_t num, char *buf, size_t buflen)
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|
{
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|
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|
zfs_nicenum(num, buf, buflen);
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}
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|
static int
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|
be_destroy_cb(zfs_handle_t *zfs_hdl, void *data)
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|
{
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|
int err;
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|
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|
if ((err = zfs_iter_children(zfs_hdl, be_destroy_cb, data)) != 0)
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|
return (err);
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|
if ((err = zfs_destroy(zfs_hdl, false)) != 0)
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|
return (err);
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|
return (0);
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}
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|
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|
/*
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|
* Destroy the boot environment or snapshot specified by the name
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* parameter. Options are or'd together with the possible values:
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|
* BE_DESTROY_FORCE : forces operation on mounted datasets
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|
*/
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|
int
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|
be_destroy(libbe_handle_t *lbh, const char *name, int options)
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|
{
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|
zfs_handle_t *fs;
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char path[BE_MAXPATHLEN];
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char *p;
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|
int err, force, mounted;
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|
p = path;
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force = options & BE_DESTROY_FORCE;
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err = BE_ERR_SUCCESS;
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be_root_concat(lbh, name, path);
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|
if (strchr(name, '@') == NULL) {
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if (!zfs_dataset_exists(lbh->lzh, path, ZFS_TYPE_FILESYSTEM))
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return (set_error(lbh, BE_ERR_NOENT));
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if (strcmp(path, lbh->rootfs) == 0)
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return (set_error(lbh, BE_ERR_DESTROYACT));
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fs = zfs_open(lbh->lzh, p, ZFS_TYPE_FILESYSTEM);
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} else {
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if (!zfs_dataset_exists(lbh->lzh, path, ZFS_TYPE_SNAPSHOT))
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return (set_error(lbh, BE_ERR_NOENT));
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|
fs = zfs_open(lbh->lzh, p, ZFS_TYPE_SNAPSHOT);
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}
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|
if (fs == NULL)
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|
return (set_error(lbh, BE_ERR_ZFSOPEN));
|
|
|
|
/* Check if mounted, unmount if force is specified */
|
|
if ((mounted = zfs_is_mounted(fs, NULL)) != 0) {
|
|
if (force)
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|
zfs_unmount(fs, NULL, 0);
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|
else
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|
return (set_error(lbh, BE_ERR_DESTROYMNT));
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|
}
|
|
|
|
if ((err = be_destroy_cb(fs, NULL)) != 0) {
|
|
/* Children are still present or the mount is referenced */
|
|
if (err == EBUSY)
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|
return (set_error(lbh, BE_ERR_DESTROYMNT));
|
|
return (set_error(lbh, BE_ERR_UNKNOWN));
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|
}
|
|
|
|
return (0);
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|
}
|
|
|
|
|
|
int
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|
be_snapshot(libbe_handle_t *lbh, const char *source, const char *snap_name,
|
|
bool recursive, char *result)
|
|
{
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|
char buf[BE_MAXPATHLEN];
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|
time_t rawtime;
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|
int len, err;
|
|
|
|
be_root_concat(lbh, source, buf);
|
|
|
|
if (!be_exists(lbh, buf))
|
|
return (BE_ERR_NOENT);
|
|
|
|
if (snap_name != NULL) {
|
|
strcat(buf, "@");
|
|
strcat(buf, snap_name);
|
|
if (result != NULL)
|
|
snprintf(result, BE_MAXPATHLEN, "%s@%s", source,
|
|
snap_name);
|
|
} else {
|
|
time(&rawtime);
|
|
len = strlen(buf);
|
|
strftime(buf + len, BE_MAXPATHLEN - len,
|
|
"@%F-%T", localtime(&rawtime));
|
|
if (result != NULL)
|
|
strcpy(result, strrchr(buf, '/') + 1);
|
|
}
|
|
|
|
if ((err = zfs_snapshot(lbh->lzh, buf, recursive, NULL)) != 0) {
|
|
switch (err) {
|
|
case EZFS_INVALIDNAME:
|
|
return (set_error(lbh, BE_ERR_INVALIDNAME));
|
|
|
|
default:
|
|
/*
|
|
* The other errors that zfs_ioc_snapshot might return
|
|
* shouldn't happen if we've set things up properly, so
|
|
* we'll gloss over them and call it UNKNOWN as it will
|
|
* require further triage.
|
|
*/
|
|
if (errno == ENOTSUP)
|
|
return (set_error(lbh, BE_ERR_NOPOOL));
|
|
return (set_error(lbh, BE_ERR_UNKNOWN));
|
|
}
|
|
}
|
|
|
|
return (BE_ERR_SUCCESS);
|
|
}
|
|
|
|
|
|
/*
|
|
* Create the boot environment specified by the name parameter
|
|
*/
|
|
int
|
|
be_create(libbe_handle_t *lbh, const char *name)
|
|
{
|
|
int err;
|
|
|
|
err = be_create_from_existing(lbh, name, be_active_path(lbh));
|
|
|
|
return (set_error(lbh, err));
|
|
}
|
|
|
|
|
|
static int
|
|
be_deep_clone_prop(int prop, void *cb)
|
|
{
|
|
int err;
|
|
struct libbe_dccb *dccb;
|
|
zprop_source_t src;
|
|
char pval[BE_MAXPATHLEN];
|
|
char source[BE_MAXPATHLEN];
|
|
|
|
dccb = cb;
|
|
/* Skip some properties we don't want to touch */
|
|
if (prop == ZFS_PROP_CANMOUNT)
|
|
return (ZPROP_CONT);
|
|
|
|
/* Don't copy readonly properties */
|
|
if (zfs_prop_readonly(prop))
|
|
return (ZPROP_CONT);
|
|
|
|
if ((err = zfs_prop_get(dccb->zhp, prop, (char *)&pval,
|
|
sizeof(pval), &src, (char *)&source, sizeof(source), false)))
|
|
/* Just continue if we fail to read a property */
|
|
return (ZPROP_CONT);
|
|
|
|
/* Only copy locally defined properties */
|
|
if (src != ZPROP_SRC_LOCAL)
|
|
return (ZPROP_CONT);
|
|
|
|
nvlist_add_string(dccb->props, zfs_prop_to_name(prop), (char *)pval);
|
|
|
|
return (ZPROP_CONT);
|
|
}
|
|
|
|
static int
|
|
be_deep_clone(zfs_handle_t *ds, void *data)
|
|
{
|
|
int err;
|
|
char be_path[BE_MAXPATHLEN];
|
|
char snap_path[BE_MAXPATHLEN];
|
|
const char *dspath;
|
|
char *dsname;
|
|
zfs_handle_t *snap_hdl;
|
|
nvlist_t *props;
|
|
struct libbe_deep_clone *isdc, sdc;
|
|
struct libbe_dccb dccb;
|
|
|
|
isdc = (struct libbe_deep_clone *)data;
|
|
dspath = zfs_get_name(ds);
|
|
if ((dsname = strrchr(dspath, '/')) == NULL)
|
|
return (BE_ERR_UNKNOWN);
|
|
dsname++;
|
|
|
|
if (isdc->bename == NULL)
|
|
snprintf(be_path, sizeof(be_path), "%s/%s", isdc->be_root, dsname);
|
|
else
|
|
snprintf(be_path, sizeof(be_path), "%s/%s", isdc->be_root, isdc->bename);
|
|
|
|
snprintf(snap_path, sizeof(snap_path), "%s@%s", dspath, isdc->snapname);
|
|
|
|
if (zfs_dataset_exists(isdc->lbh->lzh, be_path, ZFS_TYPE_DATASET))
|
|
return (set_error(isdc->lbh, BE_ERR_EXISTS));
|
|
|
|
if ((snap_hdl =
|
|
zfs_open(isdc->lbh->lzh, snap_path, ZFS_TYPE_SNAPSHOT)) == NULL)
|
|
return (set_error(isdc->lbh, BE_ERR_ZFSOPEN));
|
|
|
|
nvlist_alloc(&props, NV_UNIQUE_NAME, KM_SLEEP);
|
|
nvlist_add_string(props, "canmount", "noauto");
|
|
|
|
dccb.zhp = ds;
|
|
dccb.props = props;
|
|
if (zprop_iter(be_deep_clone_prop, &dccb, B_FALSE, B_FALSE,
|
|
ZFS_TYPE_FILESYSTEM) == ZPROP_INVAL)
|
|
return (-1);
|
|
|
|
if ((err = zfs_clone(snap_hdl, be_path, props)) != 0) {
|
|
switch (err) {
|
|
case EZFS_SUCCESS:
|
|
err = BE_ERR_SUCCESS;
|
|
break;
|
|
default:
|
|
err = BE_ERR_ZFSCLONE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
nvlist_free(props);
|
|
zfs_close(snap_hdl);
|
|
|
|
sdc.lbh = isdc->lbh;
|
|
sdc.bename = NULL;
|
|
sdc.snapname = isdc->snapname;
|
|
sdc.be_root = (char *)&be_path;
|
|
|
|
err = zfs_iter_filesystems(ds, be_deep_clone, &sdc);
|
|
|
|
return (err);
|
|
}
|
|
|
|
/*
|
|
* Create the boot environment from pre-existing snapshot
|
|
*/
|
|
int
|
|
be_create_from_existing_snap(libbe_handle_t *lbh, const char *name,
|
|
const char *snap)
|
|
{
|
|
int err;
|
|
char be_path[BE_MAXPATHLEN];
|
|
char snap_path[BE_MAXPATHLEN];
|
|
const char *bename;
|
|
char *parentname, *snapname;
|
|
zfs_handle_t *parent_hdl;
|
|
struct libbe_deep_clone sdc;
|
|
|
|
if ((err = be_validate_name(lbh, name)) != 0)
|
|
return (set_error(lbh, err));
|
|
if ((err = be_root_concat(lbh, snap, snap_path)) != 0)
|
|
return (set_error(lbh, err));
|
|
if ((err = be_validate_snap(lbh, snap_path)) != 0)
|
|
return (set_error(lbh, err));
|
|
|
|
if ((err = be_root_concat(lbh, name, be_path)) != 0)
|
|
return (set_error(lbh, err));
|
|
|
|
if ((bename = strrchr(name, '/')) == NULL)
|
|
bename = name;
|
|
else
|
|
bename++;
|
|
|
|
if ((parentname = strdup(snap_path)) == NULL) {
|
|
err = BE_ERR_UNKNOWN;
|
|
return (set_error(lbh, err));
|
|
}
|
|
snapname = strchr(parentname, '@');
|
|
if (snapname == NULL) {
|
|
err = BE_ERR_UNKNOWN;
|
|
return (set_error(lbh, err));
|
|
}
|
|
*snapname = '\0';
|
|
snapname++;
|
|
|
|
sdc.lbh = lbh;
|
|
sdc.bename = bename;
|
|
sdc.snapname = snapname;
|
|
sdc.be_root = lbh->root;
|
|
|
|
parent_hdl = zfs_open(lbh->lzh, parentname, ZFS_TYPE_DATASET);
|
|
err = be_deep_clone(parent_hdl, &sdc);
|
|
|
|
return (set_error(lbh, err));
|
|
}
|
|
|
|
|
|
/*
|
|
* Create a boot environment from an existing boot environment
|
|
*/
|
|
int
|
|
be_create_from_existing(libbe_handle_t *lbh, const char *name, const char *old)
|
|
{
|
|
int err;
|
|
char buf[BE_MAXPATHLEN];
|
|
|
|
if ((err = be_snapshot(lbh, old, NULL, true, (char *)&buf)))
|
|
return (set_error(lbh, err));
|
|
|
|
err = be_create_from_existing_snap(lbh, name, (char *)buf);
|
|
|
|
return (set_error(lbh, err));
|
|
}
|
|
|
|
|
|
/*
|
|
* Verifies that a snapshot has a valid name, exists, and has a mountpoint of
|
|
* '/'. Returns BE_ERR_SUCCESS (0), upon success, or the relevant BE_ERR_* upon
|
|
* failure. Does not set the internal library error state.
|
|
*/
|
|
int
|
|
be_validate_snap(libbe_handle_t *lbh, const char *snap_name)
|
|
{
|
|
zfs_handle_t *zfs_hdl;
|
|
char buf[BE_MAXPATHLEN];
|
|
char *delim_pos;
|
|
int err = BE_ERR_SUCCESS;
|
|
|
|
if (strlen(snap_name) >= BE_MAXPATHLEN)
|
|
return (BE_ERR_PATHLEN);
|
|
|
|
if (!zfs_dataset_exists(lbh->lzh, snap_name,
|
|
ZFS_TYPE_SNAPSHOT))
|
|
return (BE_ERR_NOENT);
|
|
|
|
strncpy(buf, snap_name, BE_MAXPATHLEN);
|
|
|
|
/* Find the base filesystem of the snapshot */
|
|
if ((delim_pos = strchr(buf, '@')) == NULL)
|
|
return (BE_ERR_INVALIDNAME);
|
|
*delim_pos = '\0';
|
|
|
|
if ((zfs_hdl =
|
|
zfs_open(lbh->lzh, buf, ZFS_TYPE_DATASET)) == NULL)
|
|
return (BE_ERR_NOORIGIN);
|
|
|
|
if ((err = zfs_prop_get(zfs_hdl, ZFS_PROP_MOUNTPOINT, buf, BE_MAXPATHLEN,
|
|
NULL, NULL, 0, 1)) != 0)
|
|
err = BE_ERR_INVORIGIN;
|
|
|
|
if ((err != 0) && (strncmp(buf, "/", BE_MAXPATHLEN) != 0))
|
|
err = BE_ERR_INVORIGIN;
|
|
|
|
zfs_close(zfs_hdl);
|
|
|
|
return (err);
|
|
}
|
|
|
|
|
|
/*
|
|
* Idempotently appends the name argument to the root boot environment path
|
|
* and copies the resulting string into the result buffer (which is assumed
|
|
* to be at least BE_MAXPATHLEN characters long. Returns BE_ERR_SUCCESS upon
|
|
* success, BE_ERR_PATHLEN if the resulting path is longer than BE_MAXPATHLEN,
|
|
* or BE_ERR_INVALIDNAME if the name is a path that does not begin with
|
|
* zfs_be_root. Does not set internal library error state.
|
|
*/
|
|
int
|
|
be_root_concat(libbe_handle_t *lbh, const char *name, char *result)
|
|
{
|
|
size_t name_len, root_len;
|
|
|
|
name_len = strlen(name);
|
|
root_len = strlen(lbh->root);
|
|
|
|
/* Act idempotently; return be name if it is already a full path */
|
|
if (strrchr(name, '/') != NULL) {
|
|
if (strstr(name, lbh->root) != name)
|
|
return (BE_ERR_INVALIDNAME);
|
|
|
|
if (name_len >= BE_MAXPATHLEN)
|
|
return (BE_ERR_PATHLEN);
|
|
|
|
strncpy(result, name, BE_MAXPATHLEN);
|
|
return (BE_ERR_SUCCESS);
|
|
} else if (name_len + root_len + 1 < BE_MAXPATHLEN) {
|
|
snprintf(result, BE_MAXPATHLEN, "%s/%s", lbh->root,
|
|
name);
|
|
return (BE_ERR_SUCCESS);
|
|
}
|
|
|
|
return (BE_ERR_PATHLEN);
|
|
}
|
|
|
|
|
|
/*
|
|
* Verifies the validity of a boot environment name (A-Za-z0-9-_.). Returns
|
|
* BE_ERR_SUCCESS (0) if name is valid, otherwise returns BE_ERR_INVALIDNAME.
|
|
* Does not set internal library error state.
|
|
*/
|
|
int
|
|
be_validate_name(libbe_handle_t *lbh __unused, const char *name)
|
|
{
|
|
for (int i = 0; *name; i++) {
|
|
char c = *(name++);
|
|
if (isalnum(c) || (c == '-') || (c == '_') || (c == '.'))
|
|
continue;
|
|
return (BE_ERR_INVALIDNAME);
|
|
}
|
|
|
|
return (BE_ERR_SUCCESS);
|
|
}
|
|
|
|
|
|
/*
|
|
* usage
|
|
*/
|
|
int
|
|
be_rename(libbe_handle_t *lbh, const char *old, const char *new)
|
|
{
|
|
char full_old[BE_MAXPATHLEN];
|
|
char full_new[BE_MAXPATHLEN];
|
|
zfs_handle_t *zfs_hdl;
|
|
int err;
|
|
|
|
if ((err = be_root_concat(lbh, old, full_old)) != 0)
|
|
return (set_error(lbh, err));
|
|
if ((err = be_root_concat(lbh, new, full_new)) != 0)
|
|
return (set_error(lbh, err));
|
|
|
|
if ((err = be_validate_name(lbh, new)) != 0)
|
|
return (err);
|
|
|
|
/* Check if old is active BE */
|
|
if (strcmp(full_old, be_active_path(lbh)) == 0)
|
|
return (set_error(lbh, BE_ERR_MOUNTED));
|
|
|
|
if (!zfs_dataset_exists(lbh->lzh, full_old, ZFS_TYPE_DATASET))
|
|
return (set_error(lbh, BE_ERR_NOENT));
|
|
|
|
if (zfs_dataset_exists(lbh->lzh, full_new, ZFS_TYPE_DATASET))
|
|
return (set_error(lbh, BE_ERR_EXISTS));
|
|
|
|
if ((zfs_hdl = zfs_open(lbh->lzh, full_old,
|
|
ZFS_TYPE_FILESYSTEM)) == NULL)
|
|
return (set_error(lbh, BE_ERR_ZFSOPEN));
|
|
|
|
/* XXX TODO: Allow a force flag */
|
|
if (zfs_is_mounted(zfs_hdl, NULL)) {
|
|
zfs_close(zfs_hdl);
|
|
return (set_error(lbh, BE_ERR_MOUNTED));
|
|
}
|
|
|
|
/* recurse, nounmount, forceunmount */
|
|
struct renameflags flags = { 0, 0, 0 };
|
|
|
|
err = zfs_rename(zfs_hdl, NULL, full_new, flags);
|
|
|
|
zfs_close(zfs_hdl);
|
|
|
|
return (set_error(lbh, err));
|
|
}
|
|
|
|
|
|
int
|
|
be_export(libbe_handle_t *lbh, const char *bootenv, int fd)
|
|
{
|
|
char snap_name[BE_MAXPATHLEN];
|
|
char buf[BE_MAXPATHLEN];
|
|
zfs_handle_t *zfs;
|
|
int err;
|
|
|
|
if ((err = be_snapshot(lbh, bootenv, NULL, true, snap_name)) != 0)
|
|
/* Use the error set by be_snapshot */
|
|
return (err);
|
|
|
|
be_root_concat(lbh, snap_name, buf);
|
|
|
|
if ((zfs = zfs_open(lbh->lzh, buf, ZFS_TYPE_DATASET)) == NULL)
|
|
return (set_error(lbh, BE_ERR_ZFSOPEN));
|
|
|
|
err = zfs_send_one(zfs, NULL, fd, 0);
|
|
zfs_close(zfs);
|
|
|
|
return (err);
|
|
}
|
|
|
|
|
|
int
|
|
be_import(libbe_handle_t *lbh, const char *bootenv, int fd)
|
|
{
|
|
char buf[BE_MAXPATHLEN];
|
|
time_t rawtime;
|
|
nvlist_t *props;
|
|
zfs_handle_t *zfs;
|
|
int err, len;
|
|
char nbuf[24];
|
|
|
|
/*
|
|
* We don't need this to be incredibly random, just unique enough that
|
|
* it won't conflict with an existing dataset name. Chopping time
|
|
* down to 32 bits is probably good enough for this.
|
|
*/
|
|
snprintf(nbuf, 24, "tmp%u",
|
|
(uint32_t)(time(NULL) & 0xFFFFFFFF));
|
|
if ((err = be_root_concat(lbh, nbuf, buf)) != 0)
|
|
/*
|
|
* Technically this is our problem, but we try to use short
|
|
* enough names that we won't run into problems except in
|
|
* worst-case BE root approaching MAXPATHLEN.
|
|
*/
|
|
return (set_error(lbh, BE_ERR_PATHLEN));
|
|
|
|
time(&rawtime);
|
|
len = strlen(buf);
|
|
strftime(buf + len, BE_MAXPATHLEN - len,
|
|
"@%F-%T", localtime(&rawtime));
|
|
|
|
if ((err = lzc_receive(buf, NULL, NULL, false, fd)) != 0) {
|
|
switch (err) {
|
|
case EINVAL:
|
|
return (set_error(lbh, BE_ERR_NOORIGIN));
|
|
case ENOENT:
|
|
return (set_error(lbh, BE_ERR_NOENT));
|
|
case EIO:
|
|
return (set_error(lbh, BE_ERR_IO));
|
|
default:
|
|
return (set_error(lbh, BE_ERR_UNKNOWN));
|
|
}
|
|
}
|
|
|
|
if ((zfs = zfs_open(lbh->lzh, buf, ZFS_TYPE_SNAPSHOT)) == NULL)
|
|
return (set_error(lbh, BE_ERR_ZFSOPEN));
|
|
|
|
nvlist_alloc(&props, NV_UNIQUE_NAME, KM_SLEEP);
|
|
nvlist_add_string(props, "canmount", "noauto");
|
|
nvlist_add_string(props, "mountpoint", "/");
|
|
|
|
be_root_concat(lbh, bootenv, buf);
|
|
|
|
err = zfs_clone(zfs, buf, props);
|
|
zfs_close(zfs);
|
|
nvlist_free(props);
|
|
|
|
if (err != 0)
|
|
return (set_error(lbh, BE_ERR_UNKNOWN));
|
|
|
|
/*
|
|
* Finally, we open up the dataset we just cloned the snapshot to so that
|
|
* we may promote it. This is necessary in order to clean up the ghost
|
|
* snapshot that doesn't need to be seen.
|
|
*/
|
|
if ((zfs = zfs_open(lbh->lzh, buf, ZFS_TYPE_DATASET)) == NULL)
|
|
return (set_error(lbh, BE_ERR_ZFSOPEN));
|
|
|
|
err = zfs_promote(zfs);
|
|
zfs_close(zfs);
|
|
|
|
if (err != 0)
|
|
return (set_error(lbh, BE_ERR_UNKNOWN));
|
|
|
|
/* Clean up the temporary snapshot */
|
|
return (be_destroy(lbh, nbuf, 0));
|
|
}
|
|
|
|
#if SOON
|
|
static int
|
|
be_create_child_noent(libbe_handle_t *lbh, const char *active,
|
|
const char *child_path)
|
|
{
|
|
nvlist_t *props;
|
|
zfs_handle_t *zfs;
|
|
int err;
|
|
|
|
nvlist_alloc(&props, NV_UNIQUE_NAME, KM_SLEEP);
|
|
nvlist_add_string(props, "canmount", "noauto");
|
|
nvlist_add_string(props, "mountpoint", child_path);
|
|
|
|
/* Create */
|
|
if ((err = zfs_create(lbh->lzh, active, ZFS_TYPE_DATASET,
|
|
props)) != 0) {
|
|
switch (err) {
|
|
case EZFS_EXISTS:
|
|
return (set_error(lbh, BE_ERR_EXISTS));
|
|
case EZFS_NOENT:
|
|
return (set_error(lbh, BE_ERR_NOENT));
|
|
case EZFS_BADTYPE:
|
|
case EZFS_BADVERSION:
|
|
return (set_error(lbh, BE_ERR_NOPOOL));
|
|
case EZFS_BADPROP:
|
|
default:
|
|
/* We set something up wrong, probably... */
|
|
return (set_error(lbh, BE_ERR_UNKNOWN));
|
|
}
|
|
}
|
|
nvlist_free(props);
|
|
|
|
if ((zfs = zfs_open(lbh->lzh, active, ZFS_TYPE_DATASET)) == NULL)
|
|
return (set_error(lbh, BE_ERR_ZFSOPEN));
|
|
|
|
/* Set props */
|
|
if ((err = zfs_prop_set(zfs, "canmount", "noauto")) != 0) {
|
|
zfs_close(zfs);
|
|
/*
|
|
* Similar to other cases, this shouldn't fail unless we've
|
|
* done something wrong. This is a new dataset that shouldn't
|
|
* have been mounted anywhere between creation and now.
|
|
*/
|
|
if (err == EZFS_NOMEM)
|
|
return (set_error(lbh, BE_ERR_NOMEM));
|
|
return (set_error(lbh, BE_ERR_UNKNOWN));
|
|
}
|
|
zfs_close(zfs);
|
|
return (BE_ERR_SUCCESS);
|
|
}
|
|
|
|
static int
|
|
be_create_child_cloned(libbe_handle_t *lbh, const char *active)
|
|
{
|
|
char buf[BE_MAXPATHLEN], tmp[BE_MAXPATHLEN];;
|
|
zfs_handle_t *zfs;
|
|
int err;
|
|
|
|
/* XXX TODO ? */
|
|
|
|
/*
|
|
* Establish if the existing path is a zfs dataset or just
|
|
* the subdirectory of one
|
|
*/
|
|
strlcpy(tmp, "tmp/be_snap.XXXXX", sizeof(tmp));
|
|
if (mktemp(tmp) == NULL)
|
|
return (set_error(lbh, BE_ERR_UNKNOWN));
|
|
|
|
be_root_concat(lbh, tmp, buf);
|
|
printf("Here %s?\n", buf);
|
|
if ((err = zfs_snapshot(lbh->lzh, buf, false, NULL)) != 0) {
|
|
switch (err) {
|
|
case EZFS_INVALIDNAME:
|
|
return (set_error(lbh, BE_ERR_INVALIDNAME));
|
|
|
|
default:
|
|
/*
|
|
* The other errors that zfs_ioc_snapshot might return
|
|
* shouldn't happen if we've set things up properly, so
|
|
* we'll gloss over them and call it UNKNOWN as it will
|
|
* require further triage.
|
|
*/
|
|
if (errno == ENOTSUP)
|
|
return (set_error(lbh, BE_ERR_NOPOOL));
|
|
return (set_error(lbh, BE_ERR_UNKNOWN));
|
|
}
|
|
}
|
|
|
|
/* Clone */
|
|
if ((zfs = zfs_open(lbh->lzh, buf, ZFS_TYPE_SNAPSHOT)) == NULL)
|
|
return (BE_ERR_ZFSOPEN);
|
|
|
|
if ((err = zfs_clone(zfs, active, NULL)) != 0)
|
|
/* XXX TODO correct error */
|
|
return (set_error(lbh, BE_ERR_UNKNOWN));
|
|
|
|
/* set props */
|
|
zfs_close(zfs);
|
|
return (BE_ERR_SUCCESS);
|
|
}
|
|
|
|
int
|
|
be_add_child(libbe_handle_t *lbh, const char *child_path, bool cp_if_exists)
|
|
{
|
|
struct stat sb;
|
|
char active[BE_MAXPATHLEN], buf[BE_MAXPATHLEN];
|
|
nvlist_t *props;
|
|
const char *s;
|
|
|
|
/* Require absolute paths */
|
|
if (*child_path != '/')
|
|
return (set_error(lbh, BE_ERR_BADPATH));
|
|
|
|
strlcpy(active, be_active_path(lbh), BE_MAXPATHLEN);
|
|
strcpy(buf, active);
|
|
|
|
/* Create non-mountable parent dataset(s) */
|
|
s = child_path;
|
|
for (char *p; (p = strchr(s+1, '/')) != NULL; s = p) {
|
|
size_t len = p - s;
|
|
strncat(buf, s, len);
|
|
|
|
nvlist_alloc(&props, NV_UNIQUE_NAME, KM_SLEEP);
|
|
nvlist_add_string(props, "canmount", "off");
|
|
nvlist_add_string(props, "mountpoint", "none");
|
|
zfs_create(lbh->lzh, buf, ZFS_TYPE_DATASET, props);
|
|
nvlist_free(props);
|
|
}
|
|
|
|
/* Path does not exist as a descendent of / yet */
|
|
if (strlcat(active, child_path, BE_MAXPATHLEN) >= BE_MAXPATHLEN)
|
|
return (set_error(lbh, BE_ERR_PATHLEN));
|
|
|
|
if (stat(child_path, &sb) != 0) {
|
|
/* Verify that error is ENOENT */
|
|
if (errno != ENOENT)
|
|
return (set_error(lbh, BE_ERR_UNKNOWN));
|
|
return (be_create_child_noent(lbh, active, child_path));
|
|
} else if (cp_if_exists)
|
|
/* Path is already a descendent of / and should be copied */
|
|
return (be_create_child_cloned(lbh, active));
|
|
return (set_error(lbh, BE_ERR_EXISTS));
|
|
}
|
|
#endif /* SOON */
|
|
|
|
static int
|
|
be_set_nextboot(libbe_handle_t *lbh, nvlist_t *config, uint64_t pool_guid,
|
|
const char *zfsdev)
|
|
{
|
|
nvlist_t **child;
|
|
uint64_t vdev_guid;
|
|
int c, children;
|
|
|
|
if (nvlist_lookup_nvlist_array(config, ZPOOL_CONFIG_CHILDREN, &child,
|
|
&children) == 0) {
|
|
for (c = 0; c < children; ++c)
|
|
if (be_set_nextboot(lbh, child[c], pool_guid, zfsdev) != 0)
|
|
return (1);
|
|
return (0);
|
|
}
|
|
|
|
if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID,
|
|
&vdev_guid) != 0) {
|
|
return (1);
|
|
}
|
|
|
|
if (zpool_nextboot(lbh->lzh, pool_guid, vdev_guid, zfsdev) != 0) {
|
|
perror("ZFS_IOC_NEXTBOOT failed");
|
|
return (1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
|
|
int
|
|
be_activate(libbe_handle_t *lbh, const char *bootenv, bool temporary)
|
|
{
|
|
char be_path[BE_MAXPATHLEN];
|
|
char buf[BE_MAXPATHLEN];
|
|
uint64_t pool_guid;
|
|
nvlist_t *config, *vdevs;
|
|
int err;
|
|
|
|
be_root_concat(lbh, bootenv, be_path);
|
|
|
|
/* Note: be_exists fails if mountpoint is not / */
|
|
if (!be_exists(lbh, be_path))
|
|
return (BE_ERR_NOENT);
|
|
|
|
if (temporary) {
|
|
config = zpool_get_config(lbh->active_phandle, NULL);
|
|
if (config == NULL)
|
|
/* config should be fetchable... */
|
|
return (set_error(lbh, BE_ERR_UNKNOWN));
|
|
|
|
if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID,
|
|
&pool_guid) != 0)
|
|
/* Similarly, it shouldn't be possible */
|
|
return (set_error(lbh, BE_ERR_UNKNOWN));
|
|
|
|
/* Expected format according to zfsbootcfg(8) man */
|
|
strcpy(buf, "zfs:");
|
|
strcat(buf, be_path);
|
|
strcat(buf, ":");
|
|
|
|
/* We have no config tree */
|
|
if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
|
|
&vdevs) != 0)
|
|
return (set_error(lbh, BE_ERR_NOPOOL));
|
|
|
|
return (be_set_nextboot(lbh, vdevs, pool_guid, buf));
|
|
} else {
|
|
/* Obtain bootenv zpool */
|
|
err = zpool_set_prop(lbh->active_phandle, "bootfs", be_path);
|
|
|
|
switch (err) {
|
|
case 0:
|
|
return (BE_ERR_SUCCESS);
|
|
|
|
default:
|
|
/* XXX TODO correct errors */
|
|
return (-1);
|
|
}
|
|
}
|
|
}
|