9640c2b4a5
Normally the default path to save the environment is /dev/env0. However, we can't map a file in a fat filesystem to /dev/env0. So if we want to store the environment in a file in fat we have to make it configurable. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
278 lines
6.6 KiB
C
278 lines
6.6 KiB
C
/*
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* Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/**
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* @file
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* @brief Environment handling support (host and target)
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*
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* Important: This file will also be used on the host to create
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* the default environment when building the barebox binary. So
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* do not add any new barebox related functions here!
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*/
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#ifdef __BAREBOX__
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#include <common.h>
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#include <command.h>
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#include <malloc.h>
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#include <errno.h>
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#include <fs.h>
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#include <fcntl.h>
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#include <envfs.h>
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#include <xfuncs.h>
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#include <libbb.h>
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#include <libgen.h>
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#include <environment.h>
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#else
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# define errno_str(x) ("void")
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#define EXPORT_SYMBOL(x)
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#endif
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char *default_environment_path = "/dev/env0";
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int file_size_action(const char *filename, struct stat *statbuf,
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void *userdata, int depth)
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{
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struct action_data *data = userdata;
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data->writep += sizeof(struct envfs_inode);
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data->writep += PAD4(strlen(filename) + 1 - strlen(data->base));
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data->writep += PAD4(statbuf->st_size);
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return 1;
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}
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int file_save_action(const char *filename, struct stat *statbuf,
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void *userdata, int depth)
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{
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struct action_data *data = userdata;
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struct envfs_inode *inode;
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int fd;
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int namelen = strlen(filename) + 1 - strlen(data->base);
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debug("handling file %s size %ld namelen %d\n", filename + strlen(data->base),
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statbuf->st_size, namelen);
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inode = (struct envfs_inode*)data->writep;
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inode->magic = ENVFS_32(ENVFS_INODE_MAGIC);
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inode->namelen = ENVFS_32(namelen);
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inode->size = ENVFS_32(statbuf->st_size);
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data->writep += sizeof(struct envfs_inode);
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strcpy(data->writep, filename + strlen(data->base));
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data->writep += PAD4(namelen);
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fd = open(filename, O_RDONLY);
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if (fd < 0) {
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printf("Open %s %s\n", filename, errno_str());
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goto out;
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}
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if (read(fd, data->writep, statbuf->st_size) < statbuf->st_size) {
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perror("read");
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goto out;
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}
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close(fd);
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data->writep += PAD4(statbuf->st_size);
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out:
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return 1;
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}
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/**
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* Make the current environment persistent
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* @param[in] filename where to store
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* @param[in] dirname what to store (all files in this dir)
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* @return 0 on success, anything else in case of failure
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*
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* Note: This function will also be used on the host! See note in the header
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* of this file.
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*/
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int envfs_save(char *filename, char *dirname)
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{
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struct envfs_super *super;
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int envfd, size, ret;
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struct action_data data;
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void *buf = NULL;
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data.writep = NULL;
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data.base = dirname;
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/* first pass: calculate size */
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recursive_action(dirname, ACTION_RECURSE, file_size_action,
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NULL, &data, 0);
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size = (unsigned long)data.writep;
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buf = xzalloc(size + sizeof(struct envfs_super));
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data.writep = buf + sizeof(struct envfs_super);
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super = (struct envfs_super *)buf;
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super->magic = ENVFS_32(ENVFS_MAGIC);
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super->size = ENVFS_32(size);
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/* second pass: copy files to buffer */
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recursive_action(dirname, ACTION_RECURSE, file_save_action,
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NULL, &data, 0);
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super->crc = ENVFS_32(crc32(0, buf + sizeof(struct envfs_super), size));
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super->sb_crc = ENVFS_32(crc32(0, buf, sizeof(struct envfs_super) - 4));
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envfd = open(filename, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
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if (envfd < 0) {
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printf("Open %s %s\n", filename, errno_str());
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ret = envfd;
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goto out1;
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}
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if (write(envfd, buf, size + sizeof(struct envfs_super)) <
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sizeof(struct envfs_super)) {
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perror("write");
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ret = -1; /* FIXME */
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goto out;
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}
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ret = 0;
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out:
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close(envfd);
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out1:
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free(buf);
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return ret;
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}
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EXPORT_SYMBOL(envfs_save);
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/**
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* Restore the last environment into the current one
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* @param[in] filename from where to restore
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* @param[in] dir where to store the last content
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* @return 0 on success, anything else in case of failure
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*
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* Note: This function will also be used on the host! See note in the header
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* of this file.
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*/
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int envfs_load(char *filename, char *dir)
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{
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struct envfs_super super;
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void *buf = NULL, *buf_free = NULL;
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int envfd;
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int fd, ret = 0;
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char *str, *tmp;
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int namelen_full;
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unsigned long size;
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envfd = open(filename, O_RDONLY);
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if (envfd < 0) {
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printf("Open %s %s\n", filename, errno_str());
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return -1;
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}
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/* read superblock */
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ret = read(envfd, &super, sizeof(struct envfs_super));
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if ( ret < sizeof(struct envfs_super)) {
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perror("read");
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ret = errno;
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goto out;
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}
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if ( ENVFS_32(super.magic) != ENVFS_MAGIC) {
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printf("envfs: wrong magic on %s\n", filename);
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ret = -EIO;
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goto out;
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}
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if (crc32(0, (unsigned char *)&super, sizeof(struct envfs_super) - 4)
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!= ENVFS_32(super.sb_crc)) {
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printf("wrong crc on env superblock\n");
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ret = -EIO;
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goto out;
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}
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size = ENVFS_32(super.size);
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buf = xmalloc(size);
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buf_free = buf;
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ret = read(envfd, buf, size);
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if (ret < size) {
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perror("read");
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ret = errno;
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goto out;
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}
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if (crc32(0, (unsigned char *)buf, size)
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!= ENVFS_32(super.crc)) {
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printf("wrong crc on env\n");
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ret = -EIO;
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goto out;
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}
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while (size) {
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struct envfs_inode *inode;
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uint32_t inode_size, inode_namelen;
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inode = (struct envfs_inode *)buf;
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if (ENVFS_32(inode->magic) != ENVFS_INODE_MAGIC) {
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printf("envfs: wrong magic on %s\n", filename);
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ret = -EIO;
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goto out;
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}
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inode_size = ENVFS_32(inode->size);
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inode_namelen = ENVFS_32(inode->namelen);
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debug("loading %s size %d namelen %d\n", inode->data,
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inode_size, inode_namelen);
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str = concat_path_file(dir, inode->data);
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tmp = strdup(str);
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make_directory(dirname(tmp));
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free(tmp);
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fd = open(str, O_WRONLY | O_CREAT | O_TRUNC, 0644);
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free(str);
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if (fd < 0) {
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printf("Open %s\n", errno_str());
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ret = fd;
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goto out;
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}
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namelen_full = PAD4(inode_namelen);
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ret = write(fd, buf + namelen_full + sizeof(struct envfs_inode),
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inode_size);
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if (ret < inode_size) {
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perror("write");
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ret = errno;
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close(fd);
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goto out;
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}
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close(fd);
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buf += PAD4(inode_namelen) + PAD4(inode_size) +
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sizeof(struct envfs_inode);
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size -= PAD4(inode_namelen) + PAD4(inode_size) +
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sizeof(struct envfs_inode);
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}
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ret = 0;
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out:
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close(envfd);
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if (buf_free)
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free(buf_free);
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return ret;
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}
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