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![Rob Herring](/assets/img/avatar_default.png)
Currently, an environment variable must be used to store the randomly generated UUID for each partition. This is not necessary, so make storing the UUID optional. Now passing uuid_disk and uuid are optional when random UUIDs are enabled. Signed-off-by: Rob Herring <robh@kernel.org> Acked-by: Przemyslaw Marczak <p.marczak@samsung.com>
360 lines
7.5 KiB
C
360 lines
7.5 KiB
C
/*
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* cmd_gpt.c -- GPT (GUID Partition Table) handling command
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*
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* Copyright (C) 2012 Samsung Electronics
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* author: Lukasz Majewski <l.majewski@samsung.com>
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* author: Piotr Wilczek <p.wilczek@samsung.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <malloc.h>
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#include <command.h>
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#include <part_efi.h>
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#include <exports.h>
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#include <linux/ctype.h>
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#include <div64.h>
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#ifndef CONFIG_PARTITION_UUIDS
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#error CONFIG_PARTITION_UUIDS must be enabled for CONFIG_CMD_GPT to be enabled
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#endif
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/**
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* extract_env(): Expand env name from string format '&{env_name}'
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* and return pointer to the env (if the env is set)
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*
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* @param str - pointer to string
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* @param env - pointer to pointer to extracted env
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*
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* @return - zero on successful expand and env is set
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*/
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static int extract_env(const char *str, char **env)
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{
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int ret = -1;
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char *e, *s;
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#ifdef CONFIG_RANDOM_UUID
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char uuid_str[UUID_STR_LEN + 1];
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#endif
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if (!str || strlen(str) < 4)
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return -1;
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if (!((strncmp(str, "${", 2) == 0) && (str[strlen(str) - 1] == '}')))
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return -1;
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s = strdup(str);
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if (s == NULL)
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return -1;
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memset(s + strlen(s) - 1, '\0', 1);
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memmove(s, s + 2, strlen(s) - 1);
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e = getenv(s);
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if (e == NULL) {
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#ifdef CONFIG_RANDOM_UUID
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debug("%s unset. ", str);
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gen_rand_uuid_str(uuid_str, UUID_STR_FORMAT_STD);
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setenv(s, uuid_str);
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e = getenv(s);
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if (e) {
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debug("Set to random.\n");
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ret = 0;
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} else {
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debug("Can't get random UUID.\n");
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}
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#else
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debug("%s unset.\n", str);
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#endif
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} else {
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debug("%s get from environment.\n", str);
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ret = 0;
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}
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*env = e;
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free(s);
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return ret;
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}
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/**
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* extract_val(): Extract value from a key=value pair list (comma separated).
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* Only value for the given key is returend.
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* Function allocates memory for the value, remember to free!
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*
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* @param str - pointer to string with key=values pairs
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* @param key - pointer to the key to search for
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*
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* @return - pointer to allocated string with the value
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*/
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static char *extract_val(const char *str, const char *key)
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{
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char *v, *k;
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char *s, *strcopy;
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char *new = NULL;
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strcopy = strdup(str);
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if (strcopy == NULL)
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return NULL;
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s = strcopy;
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while (s) {
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v = strsep(&s, ",");
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if (!v)
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break;
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k = strsep(&v, "=");
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if (!k)
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break;
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if (strcmp(k, key) == 0) {
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new = strdup(v);
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break;
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}
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}
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free(strcopy);
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return new;
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}
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/**
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* set_gpt_info(): Fill partition information from string
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* function allocates memory, remember to free!
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*
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* @param dev_desc - pointer block device descriptor
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* @param str_part - pointer to string with partition information
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* @param str_disk_guid - pointer to pointer to allocated string with disk guid
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* @param partitions - pointer to pointer to allocated partitions array
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* @param parts_count - number of partitions
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*
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* @return - zero on success, otherwise error
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*
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*/
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static int set_gpt_info(block_dev_desc_t *dev_desc,
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const char *str_part,
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char **str_disk_guid,
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disk_partition_t **partitions,
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u8 *parts_count)
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{
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char *tok, *str, *s;
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int i;
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char *val, *p;
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int p_count;
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disk_partition_t *parts;
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int errno = 0;
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uint64_t size_ll, start_ll;
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debug("%s: lba num: 0x%x %d\n", __func__,
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(unsigned int)dev_desc->lba, (unsigned int)dev_desc->lba);
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if (str_part == NULL)
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return -1;
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str = strdup(str_part);
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/* extract disk guid */
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s = str;
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val = extract_val(str, "uuid_disk");
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if (!val) {
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#ifdef CONFIG_RANDOM_UUID
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*str_disk_guid = malloc(UUID_STR_LEN + 1);
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gen_rand_uuid_str(*str_disk_guid, UUID_STR_FORMAT_STD);
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#else
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free(str);
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return -2;
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#endif
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} else {
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val = strsep(&val, ";");
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if (extract_env(val, &p))
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p = val;
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*str_disk_guid = strdup(p);
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free(val);
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/* Move s to first partition */
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strsep(&s, ";");
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}
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if (strlen(s) == 0)
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return -3;
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i = strlen(s) - 1;
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if (s[i] == ';')
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s[i] = '\0';
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/* calculate expected number of partitions */
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p_count = 1;
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p = s;
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while (*p) {
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if (*p++ == ';')
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p_count++;
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}
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/* allocate memory for partitions */
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parts = calloc(sizeof(disk_partition_t), p_count);
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/* retrieve partitions data from string */
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for (i = 0; i < p_count; i++) {
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tok = strsep(&s, ";");
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if (tok == NULL)
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break;
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/* uuid */
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val = extract_val(tok, "uuid");
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if (!val) {
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/* 'uuid' is optional if random uuid's are enabled */
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#ifdef CONFIG_RANDOM_UUID
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gen_rand_uuid_str(parts[i].uuid, UUID_STR_FORMAT_STD);
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#else
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errno = -4;
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goto err;
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#endif
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} else {
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if (extract_env(val, &p))
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p = val;
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if (strlen(p) >= sizeof(parts[i].uuid)) {
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printf("Wrong uuid format for partition %d\n", i);
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errno = -4;
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goto err;
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}
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strcpy((char *)parts[i].uuid, p);
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free(val);
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}
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/* name */
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val = extract_val(tok, "name");
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if (!val) { /* name is mandatory */
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errno = -4;
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goto err;
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}
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if (extract_env(val, &p))
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p = val;
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if (strlen(p) >= sizeof(parts[i].name)) {
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errno = -4;
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goto err;
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}
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strcpy((char *)parts[i].name, p);
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free(val);
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/* size */
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val = extract_val(tok, "size");
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if (!val) { /* 'size' is mandatory */
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errno = -4;
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goto err;
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}
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if (extract_env(val, &p))
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p = val;
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size_ll = ustrtoull(p, &p, 0);
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parts[i].size = lldiv(size_ll, dev_desc->blksz);
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free(val);
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/* start address */
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val = extract_val(tok, "start");
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if (val) { /* start address is optional */
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if (extract_env(val, &p))
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p = val;
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start_ll = ustrtoull(p, &p, 0);
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parts[i].start = lldiv(start_ll, dev_desc->blksz);
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free(val);
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}
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}
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*parts_count = p_count;
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*partitions = parts;
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free(str);
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return 0;
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err:
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free(str);
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free(*str_disk_guid);
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free(parts);
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return errno;
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}
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static int gpt_default(block_dev_desc_t *blk_dev_desc, const char *str_part)
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{
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int ret;
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char *str_disk_guid;
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u8 part_count = 0;
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disk_partition_t *partitions = NULL;
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if (!str_part)
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return -1;
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/* fill partitions */
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ret = set_gpt_info(blk_dev_desc, str_part,
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&str_disk_guid, &partitions, &part_count);
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if (ret) {
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if (ret == -1)
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printf("No partition list provided\n");
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if (ret == -2)
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printf("Missing disk guid\n");
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if ((ret == -3) || (ret == -4))
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printf("Partition list incomplete\n");
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return -1;
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}
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/* save partitions layout to disk */
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ret = gpt_restore(blk_dev_desc, str_disk_guid, partitions, part_count);
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free(str_disk_guid);
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free(partitions);
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return ret;
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}
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/**
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* do_gpt(): Perform GPT operations
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*
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* @param cmdtp - command name
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* @param flag
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* @param argc
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* @param argv
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*
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* @return zero on success; otherwise error
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*/
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static int do_gpt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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int ret = CMD_RET_SUCCESS;
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int dev = 0;
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char *ep;
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block_dev_desc_t *blk_dev_desc;
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if (argc < 5)
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return CMD_RET_USAGE;
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/* command: 'write' */
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if ((strcmp(argv[1], "write") == 0) && (argc == 5)) {
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dev = (int)simple_strtoul(argv[3], &ep, 10);
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if (!ep || ep[0] != '\0') {
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printf("'%s' is not a number\n", argv[3]);
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return CMD_RET_USAGE;
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}
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blk_dev_desc = get_dev(argv[2], dev);
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if (!blk_dev_desc) {
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printf("%s: %s dev %d NOT available\n",
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__func__, argv[2], dev);
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return CMD_RET_FAILURE;
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}
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puts("Writing GPT: ");
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ret = gpt_default(blk_dev_desc, argv[4]);
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if (!ret) {
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puts("success!\n");
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return CMD_RET_SUCCESS;
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} else {
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puts("error!\n");
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return CMD_RET_FAILURE;
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}
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} else {
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return CMD_RET_USAGE;
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}
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return ret;
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}
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U_BOOT_CMD(gpt, CONFIG_SYS_MAXARGS, 1, do_gpt,
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"GUID Partition Table",
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"<command> <interface> <dev> <partitions_list>\n"
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" - GUID partition table restoration\n"
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" Restore GPT information on a device connected\n"
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" to interface\n"
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);
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