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/*
* Create a squashfs filesystem. This is a highly compressed read only filesystem.
*
* Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
* Phillip Lougher <phillip@lougher.demon.co.uk>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2,
* or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* sort.c
*/
#define TRUE 1
#define FALSE 0
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <dirent.h>
#include <string.h>
#include <stdlib.h>
#include <squashfs_fs.h>
#include "global.h"
#include "sort.h"
#ifdef SQUASHFS_TRACE
#define TRACE(s, args...) do { \
printf("mksquashfs: "s, ## args); \
} while(0)
#else
#define TRACE(s, args...)
#endif
#define INFO(s, args...) do { \
if(!silent) printf("mksquashfs: "s, ## args); \
} while(0)
#define ERROR(s, args...) do { \
fprintf(stderr, s, ## args); \
} while(0)
#define EXIT_MKSQUASHFS() do { \
exit(1); \
} while(0)
#define BAD_ERROR(s, args...) do {\
fprintf(stderr, "FATAL ERROR:" s, ##args);\
EXIT_MKSQUASHFS();\
} while(0);
int mkisofs_style = -1;
struct sort_info {
dev_t st_dev;
ino_t st_ino;
int priority;
struct sort_info *next;
};
struct sort_info *sort_info_list[65536];
struct priority_entry *priority_list[65536];
extern int silent;
extern void write_file(squashfs_inode *inode, struct dir_ent *dir_ent,
int *c_size);
int add_priority_list(struct dir_ent *dir, int priority)
{
struct priority_entry *new_priority_entry;
priority += 32768;
if((new_priority_entry = malloc(sizeof(struct priority_entry))) == NULL) {
ERROR("Out of memory allocating priority entry\n");
return FALSE;
}
new_priority_entry->dir = dir;;
new_priority_entry->next = priority_list[priority];
priority_list[priority] = new_priority_entry;
return TRUE;
}
int get_priority(char *filename, struct stat *buf, int priority)
{
int hash = buf->st_ino & 0xffff;
struct sort_info *s;
for(s = sort_info_list[hash]; s; s = s->next)
if((s->st_dev == buf->st_dev) && (s->st_ino == buf->st_ino)) {
TRACE("returning priority %d (%s)\n", s->priority,
filename);
return s->priority;
}
TRACE("returning priority %d (%s)\n", priority, filename);
return priority;
}
#define ADD_ENTRY(buf, priority) {\
int hash = buf.st_ino & 0xffff;\
struct sort_info *s;\
if((s = malloc(sizeof(struct sort_info))) == NULL) {\
ERROR("Out of memory allocating sort list entry\n");\
return FALSE;\
}\
s->st_dev = buf.st_dev;\
s->st_ino = buf.st_ino;\
s->priority = priority;\
s->next = sort_info_list[hash];\
sort_info_list[hash] = s;\
}
int add_sort_list(char *path, int priority, int source, char *source_path[])
{
int i, n;
char filename[4096];
struct stat buf;
TRACE("add_sort_list: filename %s, priority %d\n", path, priority);
if(strlen(path) > 1 && strcmp(path + strlen(path) - 2, "/*") == 0)
path[strlen(path) - 2] = '\0';
TRACE("add_sort_list: filename %s, priority %d\n", path, priority);
re_read:
if(path[0] == '/' || strncmp(path, "./", 2) == 0 ||
strncmp(path, "../", 3) == 0 || mkisofs_style == 1) {
if(lstat(path, &buf) == -1)
goto error;
TRACE("adding filename %s, priority %d, st_dev %llx, st_ino "
"%llx\n", path, priority, buf.st_dev, buf.st_ino);
ADD_ENTRY(buf, priority);
return TRUE;
}
for(i = 0, n = 0; i < source; i++) {
strcat(strcat(strcpy(filename, source_path[i]), "/"), path);
if(lstat(filename, &buf) == -1) {
if(!(errno == ENOENT || errno == ENOTDIR))
goto error;
continue;
}
ADD_ENTRY(buf, priority);
n ++;
}
if(n == 0 && mkisofs_style == -1 && lstat(path, &buf) != -1) {
ERROR("WARNING: Mkisofs style sortlist detected! This is "
"supported but please\n");
ERROR("convert to mksquashfs style sortlist! A sortlist entry");
ERROR(" should be\neither absolute (starting with ");
ERROR("'/') start with './' or '../' (taken to be\nrelative to "
"$PWD), otherwise it ");
ERROR("is assumed the entry is relative to one\nof the source "
"directories, i.e. with ");
ERROR("\"mksquashfs test test.sqsh\",\nthe sortlist ");
ERROR("entry \"file\" is assumed to be inside the directory "
"test.\n\n");
mkisofs_style = 1;
goto re_read;
}
mkisofs_style = 0;
if(n == 1)
return TRUE;
if(n > 1)
BAD_ERROR(" Ambiguous sortlist entry \"%s\"\n\nIt maps to more "
"than one source entry! Please use an absolute path."
"\n", path);
error:
fprintf(stderr, "Cannot stat sortlist entry \"%s\"\n", path);
fprintf(stderr, "This is probably because you're using the wrong file\n");
fprintf(stderr, "path relative to the source directories\n");
return FALSE;
}
void generate_file_priorities(struct dir_info *dir, int priority,
struct stat *buf)
{
priority = get_priority(dir->pathname, buf, priority);
while(dir->current_count < dir->count) {
struct dir_ent *dir_ent = dir->list[dir->current_count++];
struct stat *buf = &dir_ent->inode->buf;
if(dir_ent->data)
continue;
switch(buf->st_mode & S_IFMT) {
case S_IFREG:
add_priority_list(dir_ent,
get_priority(dir_ent->pathname, buf,
priority));
break;
case S_IFDIR:
generate_file_priorities(dir_ent->dir, priority,
buf);
break;
}
}
dir->current_count = 0;
}
int read_sort_file(char *filename, int source, char *source_path[])
{
FILE *fd;
char sort_filename[16385];
int priority;
if((fd = fopen(filename, "r")) == NULL) {
perror("Could not open sort_list file...");
return FALSE;
}
while(fscanf(fd, "%s %d", sort_filename, &priority) != EOF)
if(priority >= -32768 && priority <= 32767)
add_sort_list(sort_filename, priority, source,
source_path);
else
ERROR("Sort file %s, priority %d outside range of "
"-32767:32768 - skipping...\n", sort_filename,
priority);
fclose(fd);
return TRUE;
}
void sort_files_and_write(struct dir_info *dir)
{
int i;
struct priority_entry *entry;
squashfs_inode inode;
int duplicate_file;
for(i = 65535; i >= 0; i--)
for(entry = priority_list[i]; entry; entry = entry->next) {
TRACE("%d: %s\n", i - 32768, entry->dir->pathname);
if(entry->dir->inode->inode == SQUASHFS_INVALID_BLK) {
write_file(&inode, entry->dir, &duplicate_file);
INFO("file %s, uncompressed size %lld bytes %s"
"\n", entry->dir->pathname,
entry->dir->inode->buf.st_size,
duplicate_file ? "DUPLICATE" : "");
entry->dir->inode->inode = inode;
entry->dir->inode->type = SQUASHFS_FILE_TYPE;
} else
INFO("file %s, uncompressed size %lld bytes "
"LINK\n", entry->dir->pathname,
entry->dir->inode->buf.st_size);
}
}
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