2 * This file and its contents are supplied under the terms of the
3 * Common Development and Distribution License ("CDDL"), version 1.0.
4 * You may only use this file in accordance with the terms of version
7 * A full copy of the text of the CDDL should have accompanied this
8 * source. A copy of the CDDL is also available via the Internet at
9 * http://www.illumos.org/license/CDDL.
12 * Copyright 2020 Toomas Soome <tsoome@me.com>
15 #include <sys/types.h>
18 #include <libzfsbootenv.h>
19 #include <sys/zfs_bootenv.h>
20 #include <sys/vdev_impl.h>
23 * Store device name to zpool label bootenv area.
24 * This call will set bootenv version to VB_NVLIST, if bootenv currently
25 * does contain other version, then old data will be replaced.
28 lzbe_set_boot_device(const char *pool, lzbe_flags_t flag, const char *device)
31 zpool_handle_t *zphdl;
37 if (pool == NULL || *pool == '\0')
40 if ((hdl = libzfs_init()) == NULL)
43 zphdl = zpool_open(hdl, pool);
51 rv = zpool_get_bootenv(zphdl, &nv);
54 * We got the nvlist, check for version.
55 * if version is missing or is not VB_NVLIST,
58 rv = nvlist_lookup_uint64(nv, BOOTENV_VERSION,
60 if (rv == 0 && version == VB_NVLIST)
63 /* Drop this nvlist */
74 /* version is mandatory */
75 fnvlist_add_uint64(nv, BOOTENV_VERSION, VB_NVLIST);
78 * If device name is empty, remove boot device configuration.
80 if ((device == NULL || *device == '\0')) {
81 if (nvlist_exists(nv, OS_BOOTONCE))
82 fnvlist_remove(nv, OS_BOOTONCE);
85 * Use device name directly if it does start with
86 * prefix "zfs:". Otherwise, add prefix and sufix.
88 if (strncmp(device, "zfs:", 4) == 0) {
89 fnvlist_add_string(nv, OS_BOOTONCE, device);
92 if (asprintf(&descriptor, "zfs:%s:", device) > 0)
93 fnvlist_add_string(nv, OS_BOOTONCE, descriptor);
100 rv = zpool_set_bootenv(zphdl, nv);
102 fprintf(stderr, "%s\n", libzfs_error_description(hdl));
111 * Return boot device name from bootenv, if set.
114 lzbe_get_boot_device(const char *pool, char **device)
116 libzfs_handle_t *hdl;
117 zpool_handle_t *zphdl;
122 if (pool == NULL || *pool == '\0' || device == NULL)
125 if ((hdl = libzfs_init()) == NULL)
128 zphdl = zpool_open(hdl, pool);
134 rv = zpool_get_bootenv(zphdl, &nv);
136 rv = nvlist_lookup_string(nv, OS_BOOTONCE, &val);
139 * zfs device descriptor is in form of "zfs:dataset:",
140 * we only do need dataset name.
142 if (strncmp(val, "zfs:", 4) == 0) {
146 size_t len = strlen(val);
148 if (val[len - 1] == ':')