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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 sqfs_hard_link_t *links = NULL;
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;
}
static void inode_stat(const sqfs_tree_node_t *node, struct stat *sb)
{
memset(sb, 0, sizeof(*sb));
sb->st_mode = node->inode->base.mode;
sb->st_uid = node->uid;
sb->st_gid = node->gid;
sb->st_mtime = node->inode->base.mod_time;
switch (node->inode->base.type) {
case SQFS_INODE_BDEV:
case SQFS_INODE_CDEV:
sb->st_rdev = node->inode->data.dev.devno;
break;
case SQFS_INODE_EXT_BDEV:
case SQFS_INODE_EXT_CDEV:
sb->st_rdev = node->inode->data.dev_ext.devno;
break;
case SQFS_INODE_SLINK:
sb->st_size = node->inode->data.slink.target_size;
break;
case SQFS_INODE_EXT_SLINK:
sb->st_size = node->inode->data.slink_ext.target_size;
break;
case SQFS_INODE_FILE:
sb->st_size = node->inode->data.file.file_size;
break;
case SQFS_INODE_EXT_FILE:
sb->st_size = node->inode->data.file_ext.file_size;
break;
case SQFS_INODE_DIR:
sb->st_size = node->inode->data.dir.size;
break;
case SQFS_INODE_EXT_DIR:
sb->st_size = node->inode->data.dir_ext.size;
break;
default:
break;
}
}
static int write_tree_dfs(const sqfs_tree_node_t *n)
{
sqfs_hard_link_t *lnk = NULL;
sqfs_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;
}
ret = sqfs_tree_node_get_path(n, &name);
if (ret != 0) {
sqfs_perror(NULL, "resolving tree node path", ret);
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++);
if (ret != 0)
sqfs_perror(name, "writing hard link", ret);
sqfs_free(name);
return ret;
}
}
if (!no_xattr && xr != NULL) {
sqfs_u32 index;
int ret;
sqfs_inode_get_xattr_index(n->inode, &index);
ret = sqfs_xattr_reader_read_all(xr, index, &xattr);
if (ret) {
sqfs_perror(name, "resolving xattr index", ret);
sqfs_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++);
sqfs_xattr_list_free(xattr);
if (ret == SQFS_ERROR_UNSUPPORTED) {
fprintf(stderr, "WARNING: %s: unsupported file type\n", name);
goto out_skip;
}
if (ret < 0) {
sqfs_perror(name, "writing tar header", ret);
sqfs_free(name);
return -1;
}
if (S_ISREG(sb.st_mode)) {
sqfs_istream_t *in;
int ret;
ret = sqfs_data_reader_create_stream(data, n->inode, name, &in);
if (ret) {
sqfs_perror(name, NULL, ret);
sqfs_free(name);
return -1;
}
do {
ret = sqfs_istream_splice(in, out_file,
super.block_size);
} while (ret > 0);
sqfs_drop(in);
if (ret == 0)
ret = padd_file(out_file, sb.st_size);
if (ret) {
sqfs_perror(name, NULL, ret);
sqfs_free(name);
return -1;
}
}
sqfs_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;
}
sqfs_free(name);
return ret;
}
int write_tree(const sqfs_tree_node_t *n)
{
sqfs_hard_link_t *lnk;
int status = -1;
if (!no_links) {
int ret = sqfs_tree_find_hard_links(n, &links);
if (ret) {
sqfs_perror(NULL, "detecting hard links in "
"file system tree", ret);
return -1;
}
for (lnk = links; lnk != NULL; lnk = lnk->next) {
lnk->target = assemble_tar_path(lnk->target, false);
if (lnk->target == NULL)
goto out_links;
}
}
status = write_tree_dfs(n);
out_links:
while (links != NULL) {
lnk = links;
links = links->next;
sqfs_free(lnk->target);
free(lnk);
}
return status;
}
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