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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* write_tree.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "sqfs2tar.h"
static unsigned int record_counter;
static sqfs_hard_link_t *find_hard_link(const char *name, sqfs_u32 inum)
{
sqfs_hard_link_t *lnk = NULL;
for (lnk = links; lnk != NULL; lnk = lnk->next) {
if (lnk->inode_number == inum) {
if (strcmp(name, lnk->target) == 0)
lnk = NULL;
break;
}
}
return lnk;
}
int write_tree_dfs(const sqfs_tree_node_t *n)
{
sqfs_hard_link_t *lnk = NULL;
tar_xattr_t *xattr = NULL;
char *name, *target;
struct stat sb;
size_t len;
int ret;
inode_stat(n, &sb);
if (n->parent == NULL) {
if (root_becomes == NULL)
goto skip_hdr;
len = strlen(root_becomes);
name = malloc(len + 2);
if (name == NULL) {
perror("creating root directory");
return -1;
}
memcpy(name, root_becomes, len);
name[len] = '/';
name[len + 1] = '\0';
} else {
if (!is_filename_sane((const char *)n->name, false)) {
fprintf(stderr, "Found a file named '%s', skipping.\n",
n->name);
if (dont_skip) {
fputs("Not allowed to skip files, aborting!\n",
stderr);
return -1;
}
return 0;
}
name = sqfs_tree_node_get_path(n);
if (name == NULL) {
perror("resolving tree node path");
return -1;
}
if (canonicalize_name(name))
goto out_skip;
name = assemble_tar_path(name, S_ISDIR(sb.st_mode));
if (name == NULL)
return -1;
lnk = find_hard_link(name, n->inode->base.inode_number);
if (lnk != NULL) {
ret = write_hard_link(out_file, &sb, name, lnk->target,
record_counter++);
free(name);
return ret;
}
}
if (!no_xattr) {
if (get_xattrs(name, n->inode, &xattr)) {
free(name);
return -1;
}
}
target = S_ISLNK(sb.st_mode) ? (char *)n->inode->extra : NULL;
ret = write_tar_header(out_file, &sb, name, target, xattr,
record_counter++);
free_xattr_list(xattr);
if (ret > 0)
goto out_skip;
if (ret < 0) {
free(name);
return -1;
}
if (S_ISREG(sb.st_mode)) {
if (sqfs_data_reader_dump(name, data, n->inode, out_file,
super.block_size, false)) {
free(name);
return -1;
}
if (padd_file(out_file, sb.st_size)) {
free(name);
return -1;
}
}
free(name);
skip_hdr:
for (n = n->children; n != NULL; n = n->next) {
if (write_tree_dfs(n))
return -1;
}
return 0;
out_skip:
if (dont_skip) {
fputs("Not allowed to skip files, aborting!\n", stderr);
ret = -1;
} else {
fprintf(stderr, "Skipping %s\n", name);
ret = 0;
}
free(name);
return ret;
}
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