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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* process_tarball.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "tar2sqfs.h"
static int write_file(sqfs_writer_t *sqfs, dir_iterator_t *it,
const dir_entry_t *ent, tree_node_t *n)
{
int flags = 0, ret = 0;
sqfs_ostream_t *out;
sqfs_istream_t *in;
if (no_tail_pack && ent->size > cfg.block_size)
flags |= SQFS_BLK_DONT_FRAGMENT;
ret = sqfs_block_processor_create_ostream(&out, ent->name, sqfs->data,
&(n->data.file.inode), flags);
if (ret)
return ret;
ret = it->open_file_ro(it, &in);
if (ret != 0) {
sqfs_drop(out);
return ret;
}
do {
ret = sqfs_istream_splice(in, out, cfg.block_size);
} while (ret > 0);
if (ret == 0)
ret = out->flush(out);
sqfs_drop(out);
sqfs_drop(in);
return ret;
}
static int copy_xattr(sqfs_writer_t *sqfs, const char *filename,
tree_node_t *node, dir_iterator_t *it)
{
sqfs_xattr_t *xattr, *list;
int ret;
ret = it->read_xattr(it, &list);
if (ret) {
sqfs_perror(filename, "reading xattrs", ret);
return -1;
}
ret = sqfs_xattr_writer_begin(sqfs->xwr, 0);
if (ret) {
sqfs_perror(filename, "beginning xattr block", ret);
goto fail;
}
for (xattr = list; xattr != NULL; xattr = xattr->next) {
ret = sqfs_xattr_writer_add(sqfs->xwr, xattr);
if (ret == SQFS_ERROR_UNSUPPORTED) {
fprintf(stderr, "%s: squashfs does not "
"support xattr prefix of %s\n",
dont_skip ? "ERROR" : "WARNING",
xattr->key);
if (dont_skip)
goto fail;
continue;
}
if (ret) {
sqfs_perror(filename, "storing xattr key-value pair",
ret);
goto fail;
}
}
ret = sqfs_xattr_writer_end(sqfs->xwr, &node->xattr_idx);
if (ret) {
sqfs_perror(filename, "completing xattr block", ret);
goto fail;
}
sqfs_xattr_list_free(list);
return 0;
fail:
sqfs_xattr_list_free(list);
return -1;
}
static int create_node_and_repack_data(sqfs_writer_t *sqfs, dir_iterator_t *it,
const dir_entry_t *ent, const char *link)
{
tree_node_t *node;
node = fstree_add_generic(&sqfs->fs, ent, link);
if (node == NULL)
goto fail_errno;
if (!cfg.quiet) {
if (ent->flags & DIR_ENTRY_FLAG_HARD_LINK) {
printf("Hard link %s -> %s\n", ent->name, link);
} else {
printf("Packing %s\n", ent->name);
}
}
if (!cfg.no_xattr) {
if (copy_xattr(sqfs, ent->name, node, it))
return -1;
}
if (S_ISREG(ent->mode)) {
int ret = write_file(sqfs, it, ent, node);
if (ret != 0) {
sqfs_perror(ent->name, "packing data", ret);
return -1;
}
}
return 0;
fail_errno:
perror(ent->name);
return -1;
}
static int set_root_attribs(sqfs_writer_t *sqfs, dir_iterator_t *it,
const dir_entry_t *ent)
{
if ((ent->flags & DIR_ENTRY_FLAG_HARD_LINK) || !S_ISDIR(ent->mode)) {
fprintf(stderr, "'%s' is not a directory!\n", ent->name);
return -1;
}
sqfs->fs.root->uid = ent->uid;
sqfs->fs.root->gid = ent->gid;
sqfs->fs.root->mode = ent->mode;
if (keep_time)
sqfs->fs.root->mod_time = ent->mtime;
if (!cfg.no_xattr) {
if (copy_xattr(sqfs, "/", sqfs->fs.root, it))
return -1;
}
return 0;
}
int process_tarball(dir_iterator_t *it, sqfs_writer_t *sqfs)
{
size_t rootlen = root_becomes == NULL ? 0 : strlen(root_becomes);
for (;;) {
bool skip = false, is_root = false, is_prefixed = true;
dir_entry_t *ent = NULL;
char *link = NULL;
int ret;
ret = it->next(it, &ent);
if (ret > 0)
break;
if (ret < 0)
return -1;
if (ent->mtime < 0)
ent->mtime = 0;
if ((sqfs_u64)ent->mtime > 0x0FFFFFFFFUL)
ent->mtime = 0x0FFFFFFFFUL;
if (S_ISLNK(ent->mode)) {
ret = it->read_link(it, &link);
if (ret != 0) {
sqfs_perror(ent->name, "read link", ret);
free(ent);
return -1;
}
}
if (root_becomes != NULL) {
if (strncmp(ent->name, root_becomes, rootlen) == 0) {
if (ent->name[rootlen] == '\0') {
is_root = true;
} else if (ent->name[rootlen] != '/') {
is_prefixed = false;
}
} else {
is_prefixed = false;
}
if (!is_prefixed) {
free(ent);
free(link);
continue;
}
if (!is_root) {
memmove(ent->name, ent->name + rootlen + 1,
strlen(ent->name + rootlen + 1) + 1);
}
if (link != NULL &&
((ent->flags & DIR_ENTRY_FLAG_HARD_LINK) ||
!no_symlink_retarget)) {
if (canonicalize_name(link) == 0 &&
!strncmp(link, root_becomes, rootlen) &&
link[rootlen] == '/') {
memmove(link, link + rootlen,
strlen(link + rootlen) + 1);
}
}
} else if (ent->name[0] == '\0') {
is_root = true;
}
if (!keep_time)
ent->mtime = sqfs->fs.defaults.mtime;
if (is_root) {
ret = set_root_attribs(sqfs, it, ent);
} else if (skip) {
ret = dont_skip ? -1 : 0;
} else {
ret = create_node_and_repack_data(sqfs, it, ent, link);
}
free(ent);
free(link);
if (ret)
return -1;
}
return 0;
}
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