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freebsd-dev/sbin/zfsbootcfg/zfsbootcfg.c
Toomas Soome e307eb94ae loader: zfs should support bootonce an nextboot 
bootonce feature is temporary, one time boot, activated by
"bectl activate -t BE", "bectl activate -T BE" will reset the bootonce flag.

By default, the bootonce setting is reset on attempt to boot and the next
boot will use previously active BE.

By setting zfs_bootonce_activate="YES" in rc.conf, the bootonce BE will
be set permanently active.

bootonce dataset name is recorded in boot pool labels, bootenv area.

in case of nextboot, the nextboot_enable boolean variable is recorded in
freebsd:nvstore nvlist, also stored in boot pool label bootenv area.
On boot, the loader will process /boot/nextboot.conf if nextboot_enable
is "YES", and will set nextboot_enable to "NO", preventing /boot/nextboot.conf
processing on next boot.

bootonce and nextboot features are usable in both UEFI and BIOS boot.

To use bootonce/nextboot features, the boot loader needs to be updated on disk;
if loader.efi is stored on ESP, then ESP needs to be updated and
for BIOS boot, stage2 (zfsboot or gptzfsboot) needs to be updated
(gpart or other tools).

At this time, only lua loader is updated.

Sponsored by:	Netflix, Klara Inc.
Differential Revision:	https://reviews.freebsd.org/D25512
2020-09-21 09:01:10 +00:00

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/*-
* Copyright (c) 2016 Andriy Gapon <avg@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <errno.h>
#include <limits.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <kenv.h>
#include <unistd.h>
#include <libzfsbootenv.h>
#ifndef ZFS_MAXNAMELEN
#define ZFS_MAXNAMELEN 256
#endif
static int
add_pair(const char *name, const char *nvlist, const char *key,
const char *type, const char *value)
{
void *data, *nv;
size_t size;
int rv;
char *end;
rv = lzbe_nvlist_get(name, nvlist, &nv);
if (rv != 0)
return (rv);
data = NULL;
rv = EINVAL;
if (strcmp(type, "DATA_TYPE_STRING") == 0) {
data = __DECONST(void *, value);
size = strlen(data) + 1;
rv = lzbe_add_pair(nv, key, type, data, size);
} else if (strcmp(type, "DATA_TYPE_UINT64") == 0) {
uint64_t v;
v = strtoull(value, &end, 0);
if (errno != 0 || *end != '\0')
goto done;
size = sizeof (v);
rv = lzbe_add_pair(nv, key, type, &v, size);
} else if (strcmp(type, "DATA_TYPE_INT64") == 0) {
int64_t v;
v = strtoll(value, &end, 0);
if (errno != 0 || *end != '\0')
goto done;
size = sizeof (v);
rv = lzbe_add_pair(nv, key, type, &v, size);
} else if (strcmp(type, "DATA_TYPE_UINT32") == 0) {
uint32_t v;
v = strtoul(value, &end, 0);
if (errno != 0 || *end != '\0')
goto done;
size = sizeof (v);
rv = lzbe_add_pair(nv, key, type, &v, size);
} else if (strcmp(type, "DATA_TYPE_INT32") == 0) {
int32_t v;
v = strtol(value, &end, 0);
if (errno != 0 || *end != '\0')
goto done;
size = sizeof (v);
rv = lzbe_add_pair(nv, key, type, &v, size);
} else if (strcmp(type, "DATA_TYPE_UINT16") == 0) {
uint16_t v;
v = strtoul(value, &end, 0);
if (errno != 0 || *end != '\0')
goto done;
size = sizeof (v);
rv = lzbe_add_pair(nv, key, type, &v, size);
} else if (strcmp(type, "DATA_TYPE_INT16") == 0) {
int16_t v;
v = strtol(value, &end, 0);
if (errno != 0 || *end != '\0')
goto done;
size = sizeof (v);
rv = lzbe_add_pair(nv, key, type, &v, size);
} else if (strcmp(type, "DATA_TYPE_UINT8") == 0) {
uint8_t v;
v = strtoul(value, &end, 0);
if (errno != 0 || *end != '\0')
goto done;
size = sizeof (v);
rv = lzbe_add_pair(nv, key, type, &v, size);
} else if (strcmp(type, "DATA_TYPE_INT8") == 0) {
int8_t v;
v = strtol(value, &end, 0);
if (errno != 0 || *end != '\0')
goto done;
size = sizeof (v);
rv = lzbe_add_pair(nv, key, type, &v, size);
} else if (strcmp(type, "DATA_TYPE_BYTE") == 0) {
uint8_t v;
v = strtoul(value, &end, 0);
if (errno != 0 || *end != '\0')
goto done;
size = sizeof (v);
rv = lzbe_add_pair(nv, key, type, &v, size);
} else if (strcmp(type, "DATA_TYPE_BOOLEAN_VALUE") == 0) {
int32_t v;
v = strtol(value, &end, 0);
if (errno != 0 || *end != '\0') {
if (strcasecmp(value, "YES") == 0)
v = 1;
else if (strcasecmp(value, "NO") == 0)
v = 0;
if (strcasecmp(value, "true") == 0)
v = 1;
else if (strcasecmp(value, "false") == 0)
v = 0;
else goto done;
}
size = sizeof (v);
rv = lzbe_add_pair(nv, key, type, &v, size);
}
if (rv == 0)
rv = lzbe_nvlist_set(name, nvlist, nv);
done:
lzbe_nvlist_free(nv);
return (rv);
}
static int
delete_pair(const char *name, const char *nvlist, const char *key)
{
void *nv;
int rv;
rv = lzbe_nvlist_get(name, nvlist, &nv);
if (rv == 0) {
rv = lzbe_remove_pair(nv, key);
}
if (rv == 0)
rv = lzbe_nvlist_set(name, nvlist, nv);
lzbe_nvlist_free(nv);
return (rv);
}
/*
* Usage: zfsbootcfg [-z pool] [-d key] [-k key -t type -v value] [-p]
* zfsbootcfg [-z pool] -n nvlist [-d key] [-k key -t type -v value] [-p]
*
* if nvlist is set, we will update nvlist in bootenv.
* if nvlist is not set, we update pairs in bootenv.
*/
int
main(int argc, char * const *argv)
{
char buf[ZFS_MAXNAMELEN], *name;
const char *key, *value, *type, *nvlist;
int rv;
bool print, delete;
nvlist = NULL;
name = NULL;
key = NULL;
type = NULL;
value = NULL;
print = delete = false;
while ((rv = getopt(argc, argv, "d:k:n:pt:v:z:")) != -1) {
switch (rv) {
case 'd':
delete = true;
key = optarg;
break;
case 'k':
key = optarg;
break;
case 'n':
nvlist = optarg;
break;
case 'p':
print = true;
break;
case 't':
type = optarg;
break;
case 'v':
value = optarg;
break;
case 'z':
name = optarg;
break;
}
}
argc -= optind;
argv += optind;
if (argc == 1)
value = argv[0];
if (argc > 1) {
fprintf(stderr, "usage: zfsbootcfg <boot.config(5) options>\n");
return (1);
}
if (name == NULL) {
rv = kenv(KENV_GET, "vfs.root.mountfrom", buf, sizeof(buf));
if (rv <= 0) {
perror("can't get vfs.root.mountfrom");
return (1);
}
if (strncmp(buf, "zfs:", 4) == 0) {
name = strchr(buf + 4, '/');
if (name != NULL)
*name = '\0';
name = buf + 4;
} else {
perror("not a zfs root");
return (1);
}
}
rv = 0;
if (key != NULL || value != NULL) {
if (type == NULL)
type = "DATA_TYPE_STRING";
if (delete)
rv = delete_pair(name, nvlist, key);
else if (key == NULL || strcmp(key, "command") == 0)
rv = lzbe_set_boot_device(name, lzbe_add, value);
else
rv = add_pair(name, nvlist, key, type, value);
if (rv == 0)
printf("zfs bootenv is successfully written\n");
else
printf("error: %d\n", rv);
} else if (!print) {
char *ptr;
if (lzbe_get_boot_device(name, &ptr) == 0) {
printf("zfs:%s:\n", ptr);
free(ptr);
}
}
if (print) {
rv = lzbe_bootenv_print(name, nvlist, stdout);
}
return (rv);
}
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