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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* rdsquashfs.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "rdsquashfs.h"
int main(int argc, char **argv)
{
sqfs_xattr_reader_t *xattr = NULL;
sqfs_compressor_config_t cfg;
int status = EXIT_FAILURE;
sqfs_data_reader_t *data;
sqfs_dir_reader_t *dirrd;
sqfs_compressor_t *cmp;
sqfs_id_table_t *idtbl;
sqfs_tree_node_t *n;
sqfs_super_t super;
sqfs_file_t *file;
options_t opt;
int ret;
process_command_line(&opt, argc, argv);
file = sqfs_open_file(opt.image_name, SQFS_FILE_OPEN_READ_ONLY);
if (file == NULL) {
perror(opt.image_name);
goto out_cmd;
}
ret = sqfs_super_read(&super, file);
if (ret) {
sqfs_perror(opt.image_name, "reading super block", ret);
goto out_file;
}
if (!sqfs_compressor_exists(super.compression_id)) {
fprintf(stderr, "%s: unknown compressor used.\n",
opt.image_name);
goto out_file;
}
sqfs_compressor_config_init(&cfg, super.compression_id,
super.block_size,
SQFS_COMP_FLAG_UNCOMPRESS);
cmp = sqfs_compressor_create(&cfg);
if (cmp == NULL) {
fputs("Error creating compressor.\n", stderr);
goto out_file;
}
if (super.flags & SQFS_FLAG_COMPRESSOR_OPTIONS) {
ret = cmp->read_options(cmp, file);
if (ret) {
sqfs_perror(opt.image_name, "reading compressor "
"options", ret);
goto out_cmp;
}
}
if (!(super.flags & SQFS_FLAG_NO_XATTRS)) {
xattr = sqfs_xattr_reader_create(file, &super, cmp);
if (xattr == NULL) {
sqfs_perror(opt.image_name, "creating xattr reader",
SQFS_ERROR_ALLOC);
goto out_cmp;
}
ret = sqfs_xattr_reader_load_locations(xattr);
if (ret) {
sqfs_perror(opt.image_name, "loading xattr table",
ret);
goto out_xr;
}
}
idtbl = sqfs_id_table_create();
if (idtbl == NULL) {
sqfs_perror(opt.image_name, "creating ID table",
SQFS_ERROR_ALLOC);
goto out_xr;
}
ret = sqfs_id_table_read(idtbl, file, &super, cmp);
if (ret) {
sqfs_perror(opt.image_name, "loading ID table", ret);
goto out_id;
}
dirrd = sqfs_dir_reader_create(&super, cmp, file);
if (dirrd == NULL) {
sqfs_perror(opt.image_name, "creating dir reader",
SQFS_ERROR_ALLOC);
goto out_id;
}
data = sqfs_data_reader_create(file, super.block_size, cmp);
if (data == NULL) {
sqfs_perror(opt.image_name, "creating data reader",
SQFS_ERROR_ALLOC);
goto out_dr;
}
ret = sqfs_data_reader_load_fragment_table(data, &super);
if (ret) {
sqfs_perror(opt.image_name, "loading fragment table", ret);
goto out_data;
}
ret = sqfs_dir_reader_get_full_hierarchy(dirrd, idtbl, opt.cmdpath,
opt.rdtree_flags, &n);
if (ret) {
sqfs_perror(opt.image_name, "reading filesystem tree", ret);
goto out_data;
}
switch (opt.op) {
case OP_LS:
list_files(n);
break;
case OP_CAT:
if (!S_ISREG(n->inode->base.mode)) {
fprintf(stderr, "/%s: not a regular file\n",
opt.cmdpath);
goto out;
}
if (sqfs_data_reader_dump(opt.cmdpath, data, n->inode,
stdout, super.block_size, false)) {
goto out;
}
break;
case OP_UNPACK:
if (opt.unpack_root != NULL) {
if (mkdir_p(opt.unpack_root))
return -1;
if (pushd(opt.unpack_root))
return -1;
}
if (restore_fstree(n, opt.flags))
goto out;
if (fill_unpacked_files(super.block_size, n, data, opt.flags))
goto out;
if (update_tree_attribs(xattr, n, opt.flags))
goto out;
if (opt.unpack_root != NULL && popd() != 0)
goto out;
break;
case OP_DESCRIBE:
if (describe_tree(n, opt.unpack_root))
goto out;
break;
case OP_RDATTR:
if (dump_xattrs(xattr, n->inode))
goto out;
break;
}
status = EXIT_SUCCESS;
out:
sqfs_dir_tree_destroy(n);
out_data:
sqfs_data_reader_destroy(data);
out_dr:
sqfs_dir_reader_destroy(dirrd);
out_id:
sqfs_id_table_destroy(idtbl);
out_xr:
if (xattr != NULL)
sqfs_xattr_reader_destroy(xattr);
out_cmp:
cmp->destroy(cmp);
out_file:
file->destroy(file);
out_cmd:
free(opt.cmdpath);
return status;
}
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