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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* sqfsdiff.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "sqfsdiff.h"
static int open_sfqs(sqfs_state_t *state, const char *path)
{
int ret;
state->file = sqfs_open_file(path, SQFS_FILE_OPEN_READ_ONLY);
if (state->file == NULL) {
perror(path);
return -1;
}
ret = sqfs_super_read(&state->super, state->file);
if (ret) {
sqfs_perror(path, "reading super block", ret);
goto fail_file;
}
ret = sqfs_compressor_exists(state->super.compression_id);
#ifdef WITH_LZO
if (state->super.compression_id == SQFS_COMP_LZO)
ret = true;
#endif
if (!ret) {
fprintf(stderr, "%s: unknown compressor used.\n",
path);
goto fail_file;
}
sqfs_compressor_config_init(&state->cfg, state->super.compression_id,
state->super.block_size,
SQFS_COMP_FLAG_UNCOMPRESS);
state->cmp = sqfs_compressor_create(&state->cfg);
#ifdef WITH_LZO
if (state->super.compression_id == SQFS_COMP_LZO && state->cmp == NULL)
state->cmp = lzo_compressor_create(&state->cfg);
#endif
if (state->cmp == NULL) {
fprintf(stderr, "%s: error creating compressor.\n", path);
goto fail_file;
}
if (state->super.flags & SQFS_FLAG_COMPRESSOR_OPTIONS) {
ret = state->cmp->read_options(state->cmp, state->file);
if (ret) {
sqfs_perror(path, "reading compressor options", ret);
goto fail_cmp;
}
}
state->idtbl = sqfs_id_table_create(0);
if (state->idtbl == NULL) {
sqfs_perror(path, "creating ID table", SQFS_ERROR_ALLOC);
goto fail_cmp;
}
ret = sqfs_id_table_read(state->idtbl, state->file,
&state->super, state->cmp);
if (ret) {
sqfs_perror(path, "loading ID table", ret);
goto fail_id;
}
state->dr = sqfs_dir_reader_create(&state->super, state->cmp,
state->file);
if (state->dr == NULL) {
sqfs_perror(path, "creating directory reader",
SQFS_ERROR_ALLOC);
goto fail_id;
}
ret = sqfs_dir_reader_get_full_hierarchy(state->dr, state->idtbl,
NULL, 0, &state->root);
if (ret) {
sqfs_perror(path, "loading filesystem tree", ret);
goto fail_dr;
}
state->data = sqfs_data_reader_create(state->file,
state->super.block_size,
state->cmp);
if (state->data == NULL) {
sqfs_perror(path, "creating data reader", SQFS_ERROR_ALLOC);
goto fail_tree;
}
ret = sqfs_data_reader_load_fragment_table(state->data, &state->super);
if (ret) {
sqfs_perror(path, "loading fragment table", ret);
goto fail_data;
}
return 0;
fail_data:
sqfs_destroy(state->data);
fail_tree:
sqfs_dir_tree_destroy(state->root);
fail_dr:
sqfs_destroy(state->dr);
fail_id:
sqfs_destroy(state->idtbl);
fail_cmp:
sqfs_destroy(state->cmp);
fail_file:
sqfs_destroy(state->file);
return -1;
}
static void close_sfqs(sqfs_state_t *state)
{
sqfs_destroy(state->data);
sqfs_dir_tree_destroy(state->root);
sqfs_destroy(state->dr);
sqfs_destroy(state->idtbl);
sqfs_destroy(state->cmp);
sqfs_destroy(state->file);
}
int main(int argc, char **argv)
{
int status, ret = 0;
sqfsdiff_t sd;
memset(&sd, 0, sizeof(sd));
process_options(&sd, argc, argv);
if (sd.extract_dir != NULL) {
if (mkdir_p(sd.extract_dir))
return 2;
}
if (open_sfqs(&sd.sqfs_old, sd.old_path))
return 2;
if (open_sfqs(&sd.sqfs_new, sd.new_path)) {
status = 2;
goto out_sqfs_old;
}
if (sd.extract_dir != NULL) {
if (chdir(sd.extract_dir)) {
perror(sd.extract_dir);
ret = -1;
goto out;
}
}
ret = node_compare(&sd, sd.sqfs_old.root, sd.sqfs_new.root);
if (ret != 0)
goto out;
if (sd.compare_super) {
ret = compare_super_blocks(&sd.sqfs_old.super,
&sd.sqfs_new.super);
if (ret != 0)
goto out;
}
out:
if (ret < 0) {
status = 2;
} else if (ret > 0) {
status = 1;
} else {
status = 0;
}
close_sfqs(&sd.sqfs_new);
out_sqfs_old:
close_sfqs(&sd.sqfs_old);
return status;
}
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