2007-07-05 16:02:19 +00:00
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/*
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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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*/
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2007-10-19 12:56:45 +00:00
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/**
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* @file
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2007-11-09 22:19:54 +00:00
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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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2009-12-15 08:11:09 +00:00
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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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2007-10-19 12:56:45 +00:00
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*/
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2009-12-15 08:11:09 +00:00
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#ifdef __BAREBOX__
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2007-07-05 16:01:44 +00:00
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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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2007-09-25 10:58:52 +00:00
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#include <libbb.h>
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#include <libgen.h>
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2007-11-09 22:19:54 +00:00
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#include <environment.h>
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2007-10-18 16:32:02 +00:00
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#else
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# define errno_str(x) ("void")
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2007-11-09 22:19:54 +00:00
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#define EXPORT_SYMBOL(x)
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2007-07-05 16:01:52 +00:00
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#endif
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2007-07-05 16:01:44 +00:00
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2013-01-20 12:10:01 +00:00
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struct action_data {
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int fd;
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const char *base;
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void *writep;
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};
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#define PAD4(x) ((x + 3) & ~3)
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2014-01-23 12:58:49 +00:00
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#ifdef __BAREBOX__
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static char *default_environment_path = "/dev/env0";
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void default_environment_path_set(char *path)
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{
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default_environment_path = path;
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}
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char *default_environment_path_get(void)
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{
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return default_environment_path;
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}
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2014-04-09 10:14:06 +00:00
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#else
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static inline int protect(int fd, size_t count, unsigned long offset, int prot)
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{
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return 0;
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}
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static inline int erase(int fd, size_t count, unsigned long offset)
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{
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return 0;
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}
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2014-01-23 12:58:49 +00:00
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#endif
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2011-03-31 10:43:59 +00:00
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2013-01-20 12:12:27 +00:00
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static int file_size_action(const char *filename, struct stat *statbuf,
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2007-11-09 22:19:54 +00:00
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void *userdata, int depth)
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2007-09-27 10:04:17 +00:00
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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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2012-08-21 13:47:53 +00:00
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data->writep += sizeof(struct envfs_inode_end);
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2012-08-22 04:51:43 +00:00
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if (S_ISLNK(statbuf->st_mode)) {
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char path[PATH_MAX];
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memset(path, 0, PATH_MAX);
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if (readlink(filename, path, PATH_MAX - 1) < 0) {
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perror("read");
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return 0;
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}
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data->writep += PAD4(strlen(path) + 1);
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} else {
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data->writep += PAD4(statbuf->st_size);
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}
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2007-09-27 10:04:17 +00:00
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return 1;
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}
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2013-01-20 12:12:27 +00:00
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static int file_save_action(const char *filename, struct stat *statbuf,
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2007-11-09 22:19:54 +00:00
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void *userdata, int depth)
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2007-07-05 16:01:44 +00:00
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{
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2007-09-25 10:58:52 +00:00
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struct action_data *data = userdata;
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2007-09-27 10:04:17 +00:00
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struct envfs_inode *inode;
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2012-08-21 13:47:53 +00:00
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struct envfs_inode_end *inode_end;
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2007-07-05 16:01:44 +00:00
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int fd;
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2007-09-25 10:58:52 +00:00
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int namelen = strlen(filename) + 1 - strlen(data->base);
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2007-09-27 10:04:17 +00:00
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inode = (struct envfs_inode*)data->writep;
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2008-02-15 12:40:30 +00:00
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inode->magic = ENVFS_32(ENVFS_INODE_MAGIC);
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2012-08-21 13:47:53 +00:00
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inode->headerlen = ENVFS_32(PAD4(namelen + sizeof(struct envfs_inode_end)));
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2007-09-27 10:04:17 +00:00
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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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2012-08-21 13:47:53 +00:00
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inode_end = (struct envfs_inode_end*)data->writep;
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data->writep += sizeof(struct envfs_inode_end);
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inode_end->magic = ENVFS_32(ENVFS_INODE_END_MAGIC);
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inode_end->mode = ENVFS_32(S_IRWXU | S_IRWXG | S_IRWXO);
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2007-09-25 10:58:52 +00:00
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2012-08-22 04:51:43 +00:00
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if (S_ISLNK(statbuf->st_mode)) {
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char path[PATH_MAX];
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int len;
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2007-09-25 10:58:52 +00:00
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2012-08-22 04:51:43 +00:00
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memset(path, 0, PATH_MAX);
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if (readlink(filename, path, PATH_MAX - 1) < 0) {
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perror("read");
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goto out;
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}
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len = strlen(path) + 1;
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inode_end->mode |= ENVFS_32(S_IFLNK);
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2007-09-25 10:58:52 +00:00
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2012-08-22 04:51:43 +00:00
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memcpy(data->writep, path, len);
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inode->size = ENVFS_32(len);
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data->writep += PAD4(len);
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2013-01-26 11:40:48 +00:00
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debug("handling symlink %s size %d namelen %d headerlen %d\n",
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filename + strlen(data->base),
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len, namelen, ENVFS_32(inode->headerlen));
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2012-08-22 04:51:43 +00:00
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} else {
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2013-01-26 11:40:48 +00:00
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debug("handling file %s size %lld namelen %d headerlen %d\n",
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filename + strlen(data->base),
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statbuf->st_size, namelen, ENVFS_32(inode->headerlen));
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2012-08-22 04:51:43 +00:00
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inode->size = ENVFS_32(statbuf->st_size);
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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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}
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2007-09-25 10:58:52 +00:00
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out:
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return 1;
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}
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2007-11-09 22:19:54 +00:00
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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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2014-02-20 13:21:18 +00:00
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int envfs_save(const char *filename, const char *dirname)
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2007-09-25 10:58:52 +00:00
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{
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2007-09-27 10:04:17 +00:00
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struct envfs_super *super;
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int envfd, size, ret;
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2007-09-25 10:58:52 +00:00
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struct action_data data;
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2014-04-08 15:20:03 +00:00
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void *buf = NULL, *wbuf;
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2007-07-05 16:01:44 +00:00
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2010-10-15 07:33:47 +00:00
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data.writep = NULL;
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2007-09-27 10:04:17 +00:00
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data.base = dirname;
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2007-07-05 16:01:44 +00:00
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2007-09-27 10:04:17 +00:00
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/* first pass: calculate size */
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recursive_action(dirname, ACTION_RECURSE, file_size_action,
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2007-11-09 22:19:54 +00:00
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NULL, &data, 0);
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2007-07-05 16:01:44 +00:00
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2007-09-27 10:04:17 +00:00
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size = (unsigned long)data.writep;
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2007-07-05 16:01:44 +00:00
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2007-09-27 10:04:17 +00:00
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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;
|
2008-02-15 12:40:30 +00:00
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super->magic = ENVFS_32(ENVFS_MAGIC);
|
2012-08-21 12:47:58 +00:00
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super->major = ENVFS_MAJOR;
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super->minor = ENVFS_MINOR;
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2008-02-15 12:40:30 +00:00
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super->size = ENVFS_32(size);
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2007-07-05 16:01:44 +00:00
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2007-09-27 10:04:17 +00:00
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/* second pass: copy files to buffer */
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2007-09-25 10:58:52 +00:00
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recursive_action(dirname, ACTION_RECURSE, file_save_action,
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2007-11-09 22:19:54 +00:00
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NULL, &data, 0);
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2007-07-05 16:01:44 +00:00
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2008-02-15 12:40:30 +00:00
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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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2007-09-27 10:04:17 +00:00
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2008-12-05 03:56:33 +00:00
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envfd = open(filename, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
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2007-09-27 10:04:17 +00:00
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if (envfd < 0) {
|
2014-04-09 10:14:06 +00:00
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printf("could not open %s: %s\n", filename, errno_str());
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ret = -errno;
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2007-09-27 10:04:17 +00:00
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goto out1;
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}
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2014-04-09 10:14:06 +00:00
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ret = protect(envfd, ~0, 0, 0);
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/* ENOSYS is no error here, many devices do not need it */
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if (ret && errno != ENOSYS) {
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printf("could not unprotect %s: %s\n", filename, errno_str());
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goto out;
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}
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ret = erase(envfd, ~0, 0);
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/* ENOSYS is no error here, many devices do not need it */
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if (ret && errno != ENOSYS) {
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printf("could not erase %s: %s\n", filename, errno_str());
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goto out;
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}
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2014-04-08 15:20:03 +00:00
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size += sizeof(struct envfs_super);
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wbuf = buf;
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while (size) {
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ssize_t now = write(envfd, wbuf, size);
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if (now < 0) {
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ret = -errno;
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goto out;
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}
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wbuf += now;
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size -= now;
|
2007-07-05 16:01:44 +00:00
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}
|
2007-09-27 10:04:17 +00:00
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2014-04-09 10:14:06 +00:00
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ret = protect(envfd, ~0, 0, 1);
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|
|
|
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/* ENOSYS is no error here, many devices do not need it */
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if (ret && errno != ENOSYS) {
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printf("could not protect %s: %s\n", filename, errno_str());
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goto out;
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}
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|
2007-09-27 10:04:17 +00:00
|
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ret = 0;
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2007-07-05 16:01:44 +00:00
|
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out:
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close(envfd);
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2007-09-27 10:04:17 +00:00
|
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out1:
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free(buf);
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return ret;
|
2007-07-05 16:01:44 +00:00
|
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}
|
2007-11-09 22:19:54 +00:00
|
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EXPORT_SYMBOL(envfs_save);
|
2007-07-05 16:01:44 +00:00
|
|
|
|
2014-02-20 07:16:01 +00:00
|
|
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static int envfs_check_super(struct envfs_super *super, size_t *size)
|
2007-07-05 16:01:44 +00:00
|
|
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{
|
2014-02-20 07:16:01 +00:00
|
|
|
if (ENVFS_32(super->magic) != ENVFS_MAGIC) {
|
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printf("envfs: wrong magic\n");
|
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return -EIO;
|
2007-07-05 16:01:44 +00:00
|
|
|
}
|
|
|
|
|
2014-02-20 07:16:01 +00:00
|
|
|
if (crc32(0, super, sizeof(*super) - 4) != ENVFS_32(super->sb_crc)) {
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|
printf("wrong crc on env superblock\n");
|
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|
return -EIO;
|
2007-07-05 16:01:44 +00:00
|
|
|
}
|
|
|
|
|
2014-02-20 07:16:01 +00:00
|
|
|
if (super->major < ENVFS_MAJOR)
|
|
|
|
printf("envfs version %d.%d loaded into %d.%d\n",
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|
|
super->major, super->minor,
|
|
|
|
ENVFS_MAJOR, ENVFS_MINOR);
|
2007-09-13 13:24:32 +00:00
|
|
|
|
2014-02-20 07:16:01 +00:00
|
|
|
*size = ENVFS_32(super->size);
|
2007-09-27 10:04:17 +00:00
|
|
|
|
2014-02-20 07:16:01 +00:00
|
|
|
return 0;
|
|
|
|
}
|
2007-09-27 10:04:17 +00:00
|
|
|
|
2014-02-18 09:25:13 +00:00
|
|
|
static int envfs_check_data(struct envfs_super *super, const void *buf, size_t size)
|
2014-02-20 07:16:01 +00:00
|
|
|
{
|
|
|
|
uint32_t crc;
|
|
|
|
|
|
|
|
crc = crc32(0, buf, size);
|
|
|
|
if (crc != ENVFS_32(super->crc)) {
|
2007-09-27 10:04:17 +00:00
|
|
|
printf("wrong crc on env\n");
|
2014-02-20 07:16:01 +00:00
|
|
|
return -EIO;
|
2007-09-27 10:04:17 +00:00
|
|
|
}
|
2008-02-15 12:40:30 +00:00
|
|
|
|
2014-02-20 07:16:01 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2014-03-29 05:44:57 +00:00
|
|
|
static int envfs_load_data(struct envfs_super *super, void *buf, size_t size,
|
|
|
|
const char *dir, unsigned flags)
|
2014-02-20 07:16:01 +00:00
|
|
|
{
|
|
|
|
int fd, ret = 0;
|
|
|
|
char *str, *tmp;
|
|
|
|
int headerlen_full;
|
|
|
|
/* for envfs < 1.0 */
|
|
|
|
struct envfs_inode_end inode_end_dummy;
|
|
|
|
|
|
|
|
inode_end_dummy.mode = ENVFS_32(S_IRWXU | S_IRWXG | S_IRWXO);
|
|
|
|
inode_end_dummy.magic = ENVFS_32(ENVFS_INODE_END_MAGIC);
|
2012-08-21 13:47:53 +00:00
|
|
|
|
2007-09-27 10:04:17 +00:00
|
|
|
while (size) {
|
|
|
|
struct envfs_inode *inode;
|
2012-08-21 13:47:53 +00:00
|
|
|
struct envfs_inode_end *inode_end;
|
|
|
|
uint32_t inode_size, inode_headerlen, namelen;
|
2008-02-15 12:40:30 +00:00
|
|
|
|
2007-09-27 10:04:17 +00:00
|
|
|
inode = (struct envfs_inode *)buf;
|
2012-08-21 13:47:53 +00:00
|
|
|
buf += sizeof(struct envfs_inode);
|
2008-02-15 12:40:30 +00:00
|
|
|
|
|
|
|
if (ENVFS_32(inode->magic) != ENVFS_INODE_MAGIC) {
|
2014-02-20 07:16:01 +00:00
|
|
|
printf("envfs: wrong magic\n");
|
2007-09-13 13:24:32 +00:00
|
|
|
ret = -EIO;
|
2007-07-05 16:01:44 +00:00
|
|
|
goto out;
|
|
|
|
}
|
2008-02-15 12:40:30 +00:00
|
|
|
inode_size = ENVFS_32(inode->size);
|
2012-08-21 13:47:53 +00:00
|
|
|
inode_headerlen = ENVFS_32(inode->headerlen);
|
|
|
|
namelen = strlen(inode->data) + 1;
|
2014-03-29 05:44:57 +00:00
|
|
|
if (super->major < 1)
|
2012-08-21 13:47:53 +00:00
|
|
|
inode_end = &inode_end_dummy;
|
|
|
|
else
|
|
|
|
inode_end = (struct envfs_inode_end *)(buf + PAD4(namelen));
|
2008-02-15 12:40:30 +00:00
|
|
|
|
2012-08-21 13:47:53 +00:00
|
|
|
debug("loading %s size %d namelen %d headerlen %d\n", inode->data,
|
|
|
|
inode_size, namelen, inode_headerlen);
|
2008-02-15 12:40:30 +00:00
|
|
|
|
2007-09-27 10:04:17 +00:00
|
|
|
str = concat_path_file(dir, inode->data);
|
2007-09-25 10:58:52 +00:00
|
|
|
tmp = strdup(str);
|
2007-09-27 10:04:17 +00:00
|
|
|
make_directory(dirname(tmp));
|
2007-09-25 10:58:52 +00:00
|
|
|
free(tmp);
|
2008-02-15 12:40:30 +00:00
|
|
|
|
2012-08-21 13:47:53 +00:00
|
|
|
headerlen_full = PAD4(inode_headerlen);
|
|
|
|
buf += headerlen_full;
|
|
|
|
|
|
|
|
if (ENVFS_32(inode_end->magic) != ENVFS_INODE_END_MAGIC) {
|
2014-02-20 07:16:01 +00:00
|
|
|
printf("envfs: wrong inode_end_magic\n");
|
2012-08-21 13:47:53 +00:00
|
|
|
ret = -EIO;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
2012-08-22 04:51:43 +00:00
|
|
|
if (S_ISLNK(ENVFS_32(inode_end->mode))) {
|
|
|
|
debug("symlink: %s -> %s\n", str, (char*)buf);
|
|
|
|
if (symlink((char*)buf, str) < 0) {
|
|
|
|
printf("symlink: %s -> %s :", str, (char*)buf);
|
|
|
|
perror("");
|
|
|
|
}
|
|
|
|
free(str);
|
|
|
|
} else {
|
2012-11-29 19:22:58 +00:00
|
|
|
struct stat s;
|
|
|
|
|
|
|
|
if (flags & ENV_FLAG_NO_OVERWRITE &&
|
|
|
|
!stat(str, &s)) {
|
|
|
|
printf("skip %s\n", str);
|
|
|
|
goto skip;
|
|
|
|
}
|
|
|
|
|
2012-08-22 04:51:43 +00:00
|
|
|
fd = open(str, O_WRONLY | O_CREAT | O_TRUNC, 0644);
|
|
|
|
free(str);
|
|
|
|
if (fd < 0) {
|
|
|
|
printf("Open %s\n", errno_str());
|
|
|
|
ret = fd;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = write(fd, buf, inode_size);
|
|
|
|
if (ret < inode_size) {
|
|
|
|
perror("write");
|
|
|
|
ret = -errno;
|
|
|
|
close(fd);
|
|
|
|
goto out;
|
|
|
|
}
|
2007-07-05 16:01:44 +00:00
|
|
|
close(fd);
|
|
|
|
}
|
2012-11-29 19:22:58 +00:00
|
|
|
skip:
|
2012-08-21 13:47:53 +00:00
|
|
|
buf += PAD4(inode_size);
|
|
|
|
size -= headerlen_full + PAD4(inode_size) +
|
2007-11-09 22:19:54 +00:00
|
|
|
sizeof(struct envfs_inode);
|
2007-07-05 16:01:44 +00:00
|
|
|
}
|
|
|
|
|
2014-02-20 07:16:01 +00:00
|
|
|
ret = 0;
|
|
|
|
out:
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
int envfs_load_from_buf(void *buf, int len, const char *dir, unsigned flags)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
size_t size;
|
|
|
|
struct envfs_super *super = buf;
|
|
|
|
|
|
|
|
buf = super + 1;
|
|
|
|
|
|
|
|
ret = envfs_check_super(super, &size);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
ret = envfs_check_data(super, buf, size);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
2014-03-29 05:44:57 +00:00
|
|
|
ret = envfs_load_data(super, buf, size, dir, flags);
|
2014-02-20 07:16:01 +00:00
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Restore the last environment into the current one
|
|
|
|
* @param[in] filename from where to restore
|
|
|
|
* @param[in] dir where to store the last content
|
|
|
|
* @return 0 on success, anything else in case of failure
|
|
|
|
*
|
|
|
|
* Note: This function will also be used on the host! See note in the header
|
|
|
|
* of this file.
|
|
|
|
*/
|
|
|
|
int envfs_load(const char *filename, const char *dir, unsigned flags)
|
|
|
|
{
|
|
|
|
struct envfs_super super;
|
2014-04-08 15:32:05 +00:00
|
|
|
void *buf = NULL, *rbuf;
|
2014-02-20 07:16:01 +00:00
|
|
|
int envfd;
|
|
|
|
int ret = 0;
|
2014-04-08 15:32:05 +00:00
|
|
|
size_t size, rsize;
|
2014-02-20 07:16:01 +00:00
|
|
|
|
|
|
|
envfd = open(filename, O_RDONLY);
|
|
|
|
if (envfd < 0) {
|
2014-04-09 09:51:18 +00:00
|
|
|
printf("environment load %s: %s\n", filename, errno_str());
|
|
|
|
if (errno == ENOENT)
|
|
|
|
printf("Maybe you have to create the partition.\n");
|
2014-02-20 07:16:01 +00:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* read superblock */
|
|
|
|
ret = read(envfd, &super, sizeof(struct envfs_super));
|
|
|
|
if ( ret < sizeof(struct envfs_super)) {
|
|
|
|
perror("read");
|
|
|
|
ret = -errno;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = envfs_check_super(&super, &size);
|
|
|
|
if (ret)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
buf = xmalloc(size);
|
2014-04-08 15:32:05 +00:00
|
|
|
|
|
|
|
rbuf = buf;
|
|
|
|
rsize = size;
|
|
|
|
|
|
|
|
while (rsize) {
|
|
|
|
ssize_t now;
|
|
|
|
|
|
|
|
now = read(envfd, rbuf, rsize);
|
|
|
|
if (now < 0) {
|
|
|
|
perror("read");
|
|
|
|
ret = -errno;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!now) {
|
|
|
|
printf("%s: premature end of file\n", filename);
|
|
|
|
ret = -EINVAL;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
rbuf += now;
|
|
|
|
rsize -= now;
|
2014-02-20 07:16:01 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
ret = envfs_check_data(&super, buf, size);
|
|
|
|
if (ret)
|
|
|
|
goto out;
|
|
|
|
|
2014-03-29 05:44:57 +00:00
|
|
|
ret = envfs_load_data(&super, buf, size, dir, flags);
|
2014-02-20 07:16:01 +00:00
|
|
|
if (ret)
|
|
|
|
goto out;
|
|
|
|
|
2007-09-27 10:04:17 +00:00
|
|
|
ret = 0;
|
2007-07-05 16:01:44 +00:00
|
|
|
out:
|
|
|
|
close(envfd);
|
2014-02-20 07:16:01 +00:00
|
|
|
free(buf);
|
|
|
|
|
2007-09-13 13:24:32 +00:00
|
|
|
return ret;
|
2007-07-05 16:01:44 +00:00
|
|
|
}
|