2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2017 Kyle J. Kneitinger <kyle@kneit.in>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/mount.h>
35 #include <sys/ucred.h>
39 #include <libzfs_core.h>
48 struct be_destroy_data {
54 static int be_create_child_noent(libbe_handle_t *lbh, const char *active,
55 const char *child_path);
56 static int be_create_child_cloned(libbe_handle_t *lbh, const char *active);
60 * Iterator function for locating the rootfs amongst the children of the
61 * zfs_be_root set by loader(8). data is expected to be a libbe_handle_t *.
64 be_locate_rootfs(libbe_handle_t *lbh)
67 struct extmnttab entry;
71 * Check first if root is ZFS; if not, we'll bail on rootfs capture.
72 * Unfortunately needed because zfs_path_to_zhandle will emit to
73 * stderr if / isn't actually a ZFS filesystem, which we'd like
76 if (statfs("/", &sfs) == 0) {
77 statfs2mnttab(&sfs, &entry);
78 if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0)
82 zfs = zfs_path_to_zhandle(lbh->lzh, "/", ZFS_TYPE_FILESYSTEM);
86 strlcpy(lbh->rootfs, zfs_get_name(zfs), sizeof(lbh->rootfs));
92 * Initializes the libbe context to operate in the root boot environment
93 * dataset, for example, zroot/ROOT.
96 libbe_init(const char *root)
98 char altroot[MAXPATHLEN];
100 char *poolname, *pos;
104 poolname = pos = NULL;
106 if ((lbh = calloc(1, sizeof(libbe_handle_t))) == NULL)
109 if ((lbh->lzh = libzfs_init()) == NULL)
113 * Grab rootfs, we'll work backwards from there if an optional BE root
114 * has not been passed in.
116 if (be_locate_rootfs(lbh) != 0) {
122 /* Strip off the final slash from rootfs to get the be root */
123 strlcpy(lbh->root, lbh->rootfs, sizeof(lbh->root));
124 pos = strrchr(lbh->root, '/');
129 strlcpy(lbh->root, root, sizeof(lbh->root));
131 if ((pos = strchr(lbh->root, '/')) == NULL)
134 pnamelen = pos - lbh->root;
135 poolname = malloc(pnamelen + 1);
136 if (poolname == NULL)
139 strlcpy(poolname, lbh->root, pnamelen + 1);
140 if ((lbh->active_phandle = zpool_open(lbh->lzh, poolname)) == NULL)
145 if (zpool_get_prop(lbh->active_phandle, ZPOOL_PROP_BOOTFS, lbh->bootfs,
146 sizeof(lbh->bootfs), NULL, true) != 0)
149 if (zpool_get_prop(lbh->active_phandle, ZPOOL_PROP_ALTROOT,
150 altroot, sizeof(altroot), NULL, true) == 0 &&
151 strcmp(altroot, "-") != 0)
152 lbh->altroot_len = strlen(altroot);
157 if (lbh->active_phandle != NULL)
158 zpool_close(lbh->active_phandle);
159 if (lbh->lzh != NULL)
160 libzfs_fini(lbh->lzh);
169 * Free memory allocated by libbe_init()
172 libbe_close(libbe_handle_t *lbh)
175 if (lbh->active_phandle != NULL)
176 zpool_close(lbh->active_phandle);
177 libzfs_fini(lbh->lzh);
182 * Proxy through to libzfs for the moment.
185 be_nicenum(uint64_t num, char *buf, size_t buflen)
188 zfs_nicenum(num, buf, buflen);
192 be_destroy_cb(zfs_handle_t *zfs_hdl, void *data)
194 char path[BE_MAXPATHLEN];
195 struct be_destroy_data *bdd;
199 bdd = (struct be_destroy_data *)data;
200 if (bdd->snapname == NULL) {
201 err = zfs_iter_children(zfs_hdl, be_destroy_cb, data);
204 return (zfs_destroy(zfs_hdl, false));
206 /* If we're dealing with snapshots instead, delete that one alone */
207 err = zfs_iter_filesystems(zfs_hdl, be_destroy_cb, data);
211 * This part is intentionally glossing over any potential errors,
212 * because there's a lot less potential for errors when we're cleaning
213 * up snapshots rather than a full deep BE. The primary error case
214 * here being if the snapshot doesn't exist in the first place, which
215 * the caller will likely deem insignificant as long as it doesn't
216 * exist after the call. Thus, such a missing snapshot shouldn't jam
217 * up the destruction.
219 snprintf(path, sizeof(path), "%s@%s", zfs_get_name(zfs_hdl),
221 if (!zfs_dataset_exists(bdd->lbh->lzh, path, ZFS_TYPE_SNAPSHOT))
223 snap = zfs_open(bdd->lbh->lzh, path, ZFS_TYPE_SNAPSHOT);
225 zfs_destroy(snap, false);
230 * Destroy the boot environment or snapshot specified by the name
231 * parameter. Options are or'd together with the possible values:
232 * BE_DESTROY_FORCE : forces operation on mounted datasets
233 * BE_DESTROY_ORIGIN: destroy the origin snapshot as well
236 be_destroy(libbe_handle_t *lbh, const char *name, int options)
238 struct be_destroy_data bdd;
239 char origin[BE_MAXPATHLEN], path[BE_MAXPATHLEN];
242 int err, force, mounted;
247 force = options & BE_DESTROY_FORCE;
250 be_root_concat(lbh, name, path);
252 if ((snapdelim = strchr(path, '@')) == NULL) {
253 if (!zfs_dataset_exists(lbh->lzh, path, ZFS_TYPE_FILESYSTEM))
254 return (set_error(lbh, BE_ERR_NOENT));
256 if (strcmp(path, lbh->rootfs) == 0 ||
257 strcmp(path, lbh->bootfs) == 0)
258 return (set_error(lbh, BE_ERR_DESTROYACT));
260 fs = zfs_open(lbh->lzh, path, ZFS_TYPE_FILESYSTEM);
262 return (set_error(lbh, BE_ERR_ZFSOPEN));
264 if ((options & BE_DESTROY_ORIGIN) != 0 &&
265 zfs_prop_get(fs, ZFS_PROP_ORIGIN, origin, sizeof(origin),
266 NULL, NULL, 0, 1) != 0)
267 return (set_error(lbh, BE_ERR_NOORIGIN));
269 /* Don't destroy a mounted dataset unless force is specified */
270 if ((mounted = zfs_is_mounted(fs, NULL)) != 0) {
272 zfs_unmount(fs, NULL, 0);
275 return (set_error(lbh, BE_ERR_DESTROYMNT));
279 if (!zfs_dataset_exists(lbh->lzh, path, ZFS_TYPE_SNAPSHOT))
280 return (set_error(lbh, BE_ERR_NOENT));
282 bdd.snapname = strdup(snapdelim + 1);
283 if (bdd.snapname == NULL)
284 return (set_error(lbh, BE_ERR_NOMEM));
286 fs = zfs_open(lbh->lzh, path, ZFS_TYPE_DATASET);
289 return (set_error(lbh, BE_ERR_ZFSOPEN));
293 err = be_destroy_cb(fs, &bdd);
297 /* Children are still present or the mount is referenced */
299 return (set_error(lbh, BE_ERR_DESTROYMNT));
300 return (set_error(lbh, BE_ERR_UNKNOWN));
303 if ((options & BE_DESTROY_ORIGIN) == 0)
306 /* The origin can't possibly be shorter than the BE root */
307 rootlen = strlen(lbh->root);
308 if (*origin == '\0' || strlen(origin) <= rootlen + 1)
309 return (set_error(lbh, BE_ERR_INVORIGIN));
312 * We'll be chopping off the BE root and running this back through
313 * be_destroy, so that we properly handle the origin snapshot whether
314 * it be that of a deep BE or not.
316 if (strncmp(origin, lbh->root, rootlen) != 0 || origin[rootlen] != '/')
319 return (be_destroy(lbh, origin + rootlen + 1,
320 options & ~BE_DESTROY_ORIGIN));
324 be_snapshot(libbe_handle_t *lbh, const char *source, const char *snap_name,
325 bool recursive, char *result)
327 char buf[BE_MAXPATHLEN];
331 be_root_concat(lbh, source, buf);
333 if ((err = be_exists(lbh, buf)) != 0)
334 return (set_error(lbh, err));
336 if (snap_name != NULL) {
337 if (strlcat(buf, "@", sizeof(buf)) >= sizeof(buf))
338 return (set_error(lbh, BE_ERR_INVALIDNAME));
340 if (strlcat(buf, snap_name, sizeof(buf)) >= sizeof(buf))
341 return (set_error(lbh, BE_ERR_INVALIDNAME));
344 snprintf(result, BE_MAXPATHLEN, "%s@%s", source,
349 strftime(buf + len, sizeof(buf) - len,
350 "@%F-%T", localtime(&rawtime));
351 if (result != NULL && strlcpy(result, strrchr(buf, '/') + 1,
352 sizeof(buf)) >= sizeof(buf))
353 return (set_error(lbh, BE_ERR_INVALIDNAME));
356 if ((err = zfs_snapshot(lbh->lzh, buf, recursive, NULL)) != 0) {
358 case EZFS_INVALIDNAME:
359 return (set_error(lbh, BE_ERR_INVALIDNAME));
363 * The other errors that zfs_ioc_snapshot might return
364 * shouldn't happen if we've set things up properly, so
365 * we'll gloss over them and call it UNKNOWN as it will
366 * require further triage.
368 if (errno == ENOTSUP)
369 return (set_error(lbh, BE_ERR_NOPOOL));
370 return (set_error(lbh, BE_ERR_UNKNOWN));
374 return (BE_ERR_SUCCESS);
379 * Create the boot environment specified by the name parameter
382 be_create(libbe_handle_t *lbh, const char *name)
386 err = be_create_from_existing(lbh, name, be_active_path(lbh));
388 return (set_error(lbh, err));
392 be_deep_clone_prop(int prop, void *cb)
395 struct libbe_dccb *dccb;
397 char pval[BE_MAXPATHLEN];
398 char source[BE_MAXPATHLEN];
402 /* Skip some properties we don't want to touch */
403 if (prop == ZFS_PROP_CANMOUNT)
406 /* Don't copy readonly properties */
407 if (zfs_prop_readonly(prop))
410 if ((err = zfs_prop_get(dccb->zhp, prop, (char *)&pval,
411 sizeof(pval), &src, (char *)&source, sizeof(source), false)))
412 /* Just continue if we fail to read a property */
415 /* Only copy locally defined properties */
416 if (src != ZPROP_SRC_LOCAL)
419 /* Augment mountpoint with altroot, if needed */
421 if (prop == ZFS_PROP_MOUNTPOINT)
422 val = be_mountpoint_augmented(dccb->lbh, val);
424 nvlist_add_string(dccb->props, zfs_prop_to_name(prop), val);
430 be_deep_clone(zfs_handle_t *ds, void *data)
433 char be_path[BE_MAXPATHLEN];
434 char snap_path[BE_MAXPATHLEN];
437 zfs_handle_t *snap_hdl;
439 struct libbe_deep_clone *isdc, sdc;
440 struct libbe_dccb dccb;
442 isdc = (struct libbe_deep_clone *)data;
443 dspath = zfs_get_name(ds);
444 if ((dsname = strrchr(dspath, '/')) == NULL)
445 return (BE_ERR_UNKNOWN);
448 if (isdc->bename == NULL)
449 snprintf(be_path, sizeof(be_path), "%s/%s", isdc->be_root, dsname);
451 snprintf(be_path, sizeof(be_path), "%s/%s", isdc->be_root, isdc->bename);
453 snprintf(snap_path, sizeof(snap_path), "%s@%s", dspath, isdc->snapname);
455 if (zfs_dataset_exists(isdc->lbh->lzh, be_path, ZFS_TYPE_DATASET))
456 return (set_error(isdc->lbh, BE_ERR_EXISTS));
459 zfs_open(isdc->lbh->lzh, snap_path, ZFS_TYPE_SNAPSHOT)) == NULL)
460 return (set_error(isdc->lbh, BE_ERR_ZFSOPEN));
462 nvlist_alloc(&props, NV_UNIQUE_NAME, KM_SLEEP);
463 nvlist_add_string(props, "canmount", "noauto");
465 dccb.lbh = isdc->lbh;
468 if (zprop_iter(be_deep_clone_prop, &dccb, B_FALSE, B_FALSE,
469 ZFS_TYPE_FILESYSTEM) == ZPROP_INVAL)
472 if ((err = zfs_clone(snap_hdl, be_path, props)) != 0)
473 err = BE_ERR_ZFSCLONE;
478 /* Failed to clone */
479 if (err != BE_ERR_SUCCESS)
480 return (set_error(isdc->lbh, err));
484 sdc.snapname = isdc->snapname;
485 sdc.be_root = (char *)&be_path;
487 err = zfs_iter_filesystems(ds, be_deep_clone, &sdc);
493 * Create the boot environment from pre-existing snapshot
496 be_create_from_existing_snap(libbe_handle_t *lbh, const char *name,
500 char be_path[BE_MAXPATHLEN];
501 char snap_path[BE_MAXPATHLEN];
503 char *parentname, *snapname;
504 zfs_handle_t *parent_hdl;
505 struct libbe_deep_clone sdc;
507 if ((err = be_validate_name(lbh, name)) != 0)
508 return (set_error(lbh, err));
509 if ((err = be_root_concat(lbh, snap, snap_path)) != 0)
510 return (set_error(lbh, err));
511 if ((err = be_validate_snap(lbh, snap_path)) != 0)
512 return (set_error(lbh, err));
514 if ((err = be_root_concat(lbh, name, be_path)) != 0)
515 return (set_error(lbh, err));
517 if ((bename = strrchr(name, '/')) == NULL)
522 if ((parentname = strdup(snap_path)) == NULL)
523 return (set_error(lbh, BE_ERR_UNKNOWN));
525 snapname = strchr(parentname, '@');
526 if (snapname == NULL) {
528 return (set_error(lbh, BE_ERR_UNKNOWN));
535 sdc.snapname = snapname;
536 sdc.be_root = lbh->root;
538 parent_hdl = zfs_open(lbh->lzh, parentname, ZFS_TYPE_DATASET);
539 err = be_deep_clone(parent_hdl, &sdc);
542 return (set_error(lbh, err));
547 * Create a boot environment from an existing boot environment
550 be_create_from_existing(libbe_handle_t *lbh, const char *name, const char *old)
553 char buf[BE_MAXPATHLEN];
555 if ((err = be_snapshot(lbh, old, NULL, true, (char *)&buf)) != 0)
556 return (set_error(lbh, err));
558 err = be_create_from_existing_snap(lbh, name, (char *)buf);
560 return (set_error(lbh, err));
565 * Verifies that a snapshot has a valid name, exists, and has a mountpoint of
566 * '/'. Returns BE_ERR_SUCCESS (0), upon success, or the relevant BE_ERR_* upon
567 * failure. Does not set the internal library error state.
570 be_validate_snap(libbe_handle_t *lbh, const char *snap_name)
573 if (strlen(snap_name) >= BE_MAXPATHLEN)
574 return (BE_ERR_PATHLEN);
576 if (!zfs_dataset_exists(lbh->lzh, snap_name,
578 return (BE_ERR_NOENT);
580 return (BE_ERR_SUCCESS);
585 * Idempotently appends the name argument to the root boot environment path
586 * and copies the resulting string into the result buffer (which is assumed
587 * to be at least BE_MAXPATHLEN characters long. Returns BE_ERR_SUCCESS upon
588 * success, BE_ERR_PATHLEN if the resulting path is longer than BE_MAXPATHLEN,
589 * or BE_ERR_INVALIDNAME if the name is a path that does not begin with
590 * zfs_be_root. Does not set internal library error state.
593 be_root_concat(libbe_handle_t *lbh, const char *name, char *result)
595 size_t name_len, root_len;
597 name_len = strlen(name);
598 root_len = strlen(lbh->root);
600 /* Act idempotently; return be name if it is already a full path */
601 if (strrchr(name, '/') != NULL) {
602 if (strstr(name, lbh->root) != name)
603 return (BE_ERR_INVALIDNAME);
605 if (name_len >= BE_MAXPATHLEN)
606 return (BE_ERR_PATHLEN);
608 strlcpy(result, name, BE_MAXPATHLEN);
609 return (BE_ERR_SUCCESS);
610 } else if (name_len + root_len + 1 < BE_MAXPATHLEN) {
611 snprintf(result, BE_MAXPATHLEN, "%s/%s", lbh->root,
613 return (BE_ERR_SUCCESS);
616 return (BE_ERR_PATHLEN);
621 * Verifies the validity of a boot environment name (A-Za-z0-9-_.). Returns
622 * BE_ERR_SUCCESS (0) if name is valid, otherwise returns BE_ERR_INVALIDNAME
624 * Does not set internal library error state.
627 be_validate_name(libbe_handle_t *lbh, const char *name)
629 for (int i = 0; *name; i++) {
631 if (isalnum(c) || (c == '-') || (c == '_') || (c == '.'))
633 return (BE_ERR_INVALIDNAME);
637 * Impose the additional restriction that the entire dataset name must
638 * not exceed the maximum length of a dataset, i.e. MAXNAMELEN.
640 if (strlen(lbh->root) + 1 + strlen(name) > MAXNAMELEN)
641 return (BE_ERR_PATHLEN);
642 return (BE_ERR_SUCCESS);
650 be_rename(libbe_handle_t *lbh, const char *old, const char *new)
652 char full_old[BE_MAXPATHLEN];
653 char full_new[BE_MAXPATHLEN];
654 zfs_handle_t *zfs_hdl;
658 * be_validate_name is documented not to set error state, so we should
661 if ((err = be_validate_name(lbh, new)) != 0)
662 return (set_error(lbh, err));
663 if ((err = be_root_concat(lbh, old, full_old)) != 0)
664 return (set_error(lbh, err));
665 if ((err = be_root_concat(lbh, new, full_new)) != 0)
666 return (set_error(lbh, err));
668 if (!zfs_dataset_exists(lbh->lzh, full_old, ZFS_TYPE_DATASET))
669 return (set_error(lbh, BE_ERR_NOENT));
671 if (zfs_dataset_exists(lbh->lzh, full_new, ZFS_TYPE_DATASET))
672 return (set_error(lbh, BE_ERR_EXISTS));
674 if ((zfs_hdl = zfs_open(lbh->lzh, full_old,
675 ZFS_TYPE_FILESYSTEM)) == NULL)
676 return (set_error(lbh, BE_ERR_ZFSOPEN));
678 /* recurse, nounmount, forceunmount */
679 struct renameflags flags = {
683 err = zfs_rename(zfs_hdl, NULL, full_new, flags);
687 return (set_error(lbh, BE_ERR_UNKNOWN));
693 be_export(libbe_handle_t *lbh, const char *bootenv, int fd)
695 char snap_name[BE_MAXPATHLEN];
696 char buf[BE_MAXPATHLEN];
700 if ((err = be_snapshot(lbh, bootenv, NULL, true, snap_name)) != 0)
701 /* Use the error set by be_snapshot */
704 be_root_concat(lbh, snap_name, buf);
706 if ((zfs = zfs_open(lbh->lzh, buf, ZFS_TYPE_DATASET)) == NULL)
707 return (set_error(lbh, BE_ERR_ZFSOPEN));
709 err = zfs_send_one(zfs, NULL, fd, 0);
717 be_import(libbe_handle_t *lbh, const char *bootenv, int fd)
719 char buf[BE_MAXPATHLEN];
722 recvflags_t flags = { .nomount = 1 };
725 be_root_concat(lbh, bootenv, buf);
727 if ((err = zfs_receive(lbh->lzh, buf, NULL, &flags, fd, NULL)) != 0) {
730 return (set_error(lbh, BE_ERR_NOORIGIN));
732 return (set_error(lbh, BE_ERR_NOENT));
734 return (set_error(lbh, BE_ERR_IO));
736 return (set_error(lbh, BE_ERR_UNKNOWN));
740 if ((zfs = zfs_open(lbh->lzh, buf, ZFS_TYPE_FILESYSTEM)) == NULL)
741 return (set_error(lbh, BE_ERR_ZFSOPEN));
743 nvlist_alloc(&props, NV_UNIQUE_NAME, KM_SLEEP);
744 nvlist_add_string(props, "canmount", "noauto");
745 nvlist_add_string(props, "mountpoint", "/");
747 err = zfs_prop_set_list(zfs, props);
753 return (set_error(lbh, BE_ERR_UNKNOWN));
760 be_create_child_noent(libbe_handle_t *lbh, const char *active,
761 const char *child_path)
767 nvlist_alloc(&props, NV_UNIQUE_NAME, KM_SLEEP);
768 nvlist_add_string(props, "canmount", "noauto");
769 nvlist_add_string(props, "mountpoint", child_path);
772 if ((err = zfs_create(lbh->lzh, active, ZFS_TYPE_DATASET,
776 return (set_error(lbh, BE_ERR_EXISTS));
778 return (set_error(lbh, BE_ERR_NOENT));
780 case EZFS_BADVERSION:
781 return (set_error(lbh, BE_ERR_NOPOOL));
784 /* We set something up wrong, probably... */
785 return (set_error(lbh, BE_ERR_UNKNOWN));
790 if ((zfs = zfs_open(lbh->lzh, active, ZFS_TYPE_DATASET)) == NULL)
791 return (set_error(lbh, BE_ERR_ZFSOPEN));
794 if ((err = zfs_prop_set(zfs, "canmount", "noauto")) != 0) {
797 * Similar to other cases, this shouldn't fail unless we've
798 * done something wrong. This is a new dataset that shouldn't
799 * have been mounted anywhere between creation and now.
801 if (err == EZFS_NOMEM)
802 return (set_error(lbh, BE_ERR_NOMEM));
803 return (set_error(lbh, BE_ERR_UNKNOWN));
806 return (BE_ERR_SUCCESS);
810 be_create_child_cloned(libbe_handle_t *lbh, const char *active)
812 char buf[BE_MAXPATHLEN], tmp[BE_MAXPATHLEN];;
819 * Establish if the existing path is a zfs dataset or just
820 * the subdirectory of one
822 strlcpy(tmp, "tmp/be_snap.XXXXX", sizeof(tmp));
823 if (mktemp(tmp) == NULL)
824 return (set_error(lbh, BE_ERR_UNKNOWN));
826 be_root_concat(lbh, tmp, buf);
827 printf("Here %s?\n", buf);
828 if ((err = zfs_snapshot(lbh->lzh, buf, false, NULL)) != 0) {
830 case EZFS_INVALIDNAME:
831 return (set_error(lbh, BE_ERR_INVALIDNAME));
835 * The other errors that zfs_ioc_snapshot might return
836 * shouldn't happen if we've set things up properly, so
837 * we'll gloss over them and call it UNKNOWN as it will
838 * require further triage.
840 if (errno == ENOTSUP)
841 return (set_error(lbh, BE_ERR_NOPOOL));
842 return (set_error(lbh, BE_ERR_UNKNOWN));
847 if ((zfs = zfs_open(lbh->lzh, buf, ZFS_TYPE_SNAPSHOT)) == NULL)
848 return (BE_ERR_ZFSOPEN);
850 if ((err = zfs_clone(zfs, active, NULL)) != 0)
851 /* XXX TODO correct error */
852 return (set_error(lbh, BE_ERR_UNKNOWN));
856 return (BE_ERR_SUCCESS);
860 be_add_child(libbe_handle_t *lbh, const char *child_path, bool cp_if_exists)
863 char active[BE_MAXPATHLEN], buf[BE_MAXPATHLEN];
867 /* Require absolute paths */
868 if (*child_path != '/')
869 return (set_error(lbh, BE_ERR_BADPATH));
871 strlcpy(active, be_active_path(lbh), BE_MAXPATHLEN);
874 /* Create non-mountable parent dataset(s) */
876 for (char *p; (p = strchr(s+1, '/')) != NULL; s = p) {
878 strncat(buf, s, len);
880 nvlist_alloc(&props, NV_UNIQUE_NAME, KM_SLEEP);
881 nvlist_add_string(props, "canmount", "off");
882 nvlist_add_string(props, "mountpoint", "none");
883 zfs_create(lbh->lzh, buf, ZFS_TYPE_DATASET, props);
887 /* Path does not exist as a descendent of / yet */
888 if (strlcat(active, child_path, BE_MAXPATHLEN) >= BE_MAXPATHLEN)
889 return (set_error(lbh, BE_ERR_PATHLEN));
891 if (stat(child_path, &sb) != 0) {
892 /* Verify that error is ENOENT */
894 return (set_error(lbh, BE_ERR_UNKNOWN));
895 return (be_create_child_noent(lbh, active, child_path));
896 } else if (cp_if_exists)
897 /* Path is already a descendent of / and should be copied */
898 return (be_create_child_cloned(lbh, active));
899 return (set_error(lbh, BE_ERR_EXISTS));
904 be_set_nextboot(libbe_handle_t *lbh, nvlist_t *config, uint64_t pool_guid,
911 if (nvlist_lookup_nvlist_array(config, ZPOOL_CONFIG_CHILDREN, &child,
913 for (c = 0; c < children; ++c)
914 if (be_set_nextboot(lbh, child[c], pool_guid, zfsdev) != 0)
919 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID,
924 if (zpool_nextboot(lbh->lzh, pool_guid, vdev_guid, zfsdev) != 0) {
925 perror("ZFS_IOC_NEXTBOOT failed");
933 * Deactivate old BE dataset; currently just sets canmount=noauto
936 be_deactivate(libbe_handle_t *lbh, const char *ds)
940 if ((zfs = zfs_open(lbh->lzh, ds, ZFS_TYPE_DATASET)) == NULL)
942 if (zfs_prop_set(zfs, "canmount", "noauto") != 0)
949 be_activate(libbe_handle_t *lbh, const char *bootenv, bool temporary)
951 char be_path[BE_MAXPATHLEN];
952 char buf[BE_MAXPATHLEN];
953 nvlist_t *config, *dsprops, *vdevs;
959 be_root_concat(lbh, bootenv, be_path);
961 /* Note: be_exists fails if mountpoint is not / */
962 if ((err = be_exists(lbh, be_path)) != 0)
963 return (set_error(lbh, err));
966 config = zpool_get_config(lbh->active_phandle, NULL);
968 /* config should be fetchable... */
969 return (set_error(lbh, BE_ERR_UNKNOWN));
971 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID,
973 /* Similarly, it shouldn't be possible */
974 return (set_error(lbh, BE_ERR_UNKNOWN));
976 /* Expected format according to zfsbootcfg(8) man */
977 snprintf(buf, sizeof(buf), "zfs:%s:", be_path);
979 /* We have no config tree */
980 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
982 return (set_error(lbh, BE_ERR_NOPOOL));
984 return (be_set_nextboot(lbh, vdevs, pool_guid, buf));
986 if (be_deactivate(lbh, lbh->bootfs) != 0)
989 /* Obtain bootenv zpool */
990 err = zpool_set_prop(lbh->active_phandle, "bootfs", be_path);
994 zhp = zfs_open(lbh->lzh, be_path, ZFS_TYPE_FILESYSTEM);
998 if (be_prop_list_alloc(&dsprops) != 0)
1001 if (be_get_dataset_props(lbh, be_path, dsprops) != 0) {
1002 nvlist_free(dsprops);
1006 if (nvlist_lookup_string(dsprops, "origin", &origin) == 0)
1007 err = zfs_promote(zhp);
1008 nvlist_free(dsprops);
1016 return (BE_ERR_SUCCESS);