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/*
* Create a squashfs filesystem. This is a highly compressed read only
* filesystem.
*
* Copyright (c) 2022
* Phillip Lougher <phillip@squashfs.org.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.
*
* pseudo_xattr.c
*/
#include <string.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <regex.h>
#include <dirent.h>
#include "pseudo.h"
#include "mksquashfs_error.h"
#include "squashfs_fs.h"
#include "xattr.h"
#define TRUE 1
#define FALSE 0
static void add_xattr(struct pseudo_xattr **xattr, struct xattr_add *entry)
{
if(*xattr == NULL) {
*xattr = malloc(sizeof(struct pseudo_xattr));
if(*xattr == NULL)
MEM_ERROR();
(*xattr)->xattr = entry;
entry->next = NULL;
(*xattr)->count = 1;
} else {
entry->next = (*xattr)->xattr;
(*xattr)->xattr = entry;
(*xattr)->count ++;
}
}
/*
* Add pseudo xattr to the set of pseudo definitions.
*/
static struct pseudo *add_pseudo_xattr(struct pseudo *pseudo, struct xattr_add *xattr,
char *target, char *alltarget)
{
char *targname;
int i;
target = get_element(target, &targname);
if(pseudo == NULL) {
pseudo = malloc(sizeof(struct pseudo));
if(pseudo == NULL)
MEM_ERROR();
pseudo->names = 0;
pseudo->count = 0;
pseudo->name = NULL;
}
for(i = 0; i < pseudo->names; i++)
if(strcmp(pseudo->name[i].name, targname) == 0)
break;
if(i == pseudo->names) {
/* allocate new name entry */
pseudo->names ++;
pseudo->name = realloc(pseudo->name, (i + 1) *
sizeof(struct pseudo_entry));
if(pseudo->name == NULL)
MEM_ERROR();
pseudo->name[i].name = targname;
pseudo->name[i].pathname = NULL;
pseudo->name[i].dev = NULL;
pseudo->name[i].xattr = NULL;
if(target[0] == '\0') {
/* at leaf pathname component */
pseudo->name[i].pathname = strdup(alltarget);
pseudo->name[i].pseudo = NULL;
add_xattr(&pseudo->name[i].xattr, xattr);
} else {
/* recurse adding child components */
pseudo->name[i].pseudo = add_pseudo_xattr(NULL, xattr,
target, alltarget);
}
} else {
/* existing matching entry */
free(targname);
if(target[0] == '\0') {
/* Add xattr to this entry */
pseudo->name[i].pathname = strdup(alltarget);
add_xattr(&pseudo->name[i].xattr, xattr);
} else {
/* recurse adding child components */
pseudo->name[i].pseudo = add_pseudo_xattr(pseudo->name[i].pseudo, xattr, target, alltarget);
}
}
return pseudo;
}
static struct pseudo *add_pseudo_xattr_definition(struct pseudo *pseudo,
struct xattr_add *xattr, char *target, char *alltarget)
{
/* special case if a root pseudo definition is being added */
if(strcmp(target, "/") == 0) {
/* if already have a root pseudo just add xattr */
if(pseudo && pseudo->names == 1 && strcmp(pseudo->name[0].name, "/") == 0) {
add_xattr(&pseudo->name[0].xattr, xattr);
return pseudo;
} else {
struct pseudo *new = malloc(sizeof(struct pseudo));
if(new == NULL)
MEM_ERROR();
new->names = 1;
new->count = 0;
new->name = malloc(sizeof(struct pseudo_entry));
if(new->name == NULL)
MEM_ERROR();
new->name[0].name = "/";
new->name[0].pseudo = pseudo;
new->name[0].pathname = "/";
new->name[0].dev = NULL;
new->name[0].xattr = NULL;
add_xattr(&new->name[0].xattr, xattr);
return new;
}
}
/* if there's a root pseudo definition, skip it before walking target */
if(pseudo && pseudo->names == 1 && strcmp(pseudo->name[0].name, "/") == 0) {
pseudo->name[0].pseudo = add_pseudo_xattr(pseudo->name[0].pseudo, xattr, target, alltarget);
return pseudo;
} else
return add_pseudo_xattr(pseudo, xattr, target, alltarget);
}
int read_pseudo_xattr(char *orig_def, char *filename, char *name, char *def)
{
struct xattr_add *xattr = xattr_parse(def, "", "pseudo xattr");
if(xattr == NULL) {
print_definitions();
free(filename);
return FALSE;
}
pseudo = add_pseudo_xattr_definition(pseudo, xattr, name, name);
free(filename);
return TRUE;
}
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