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/* SPDX-License-Identifier: GPL-3.0-or-later */
#include "meta_reader.h"
#include "data_reader.h"
#include "highlevel.h"
#include "compress.h"
#include "fstree.h"
#include "util.h"
#include "tar.h"
#include <getopt.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
static struct option long_opts[] = {
{ "no-skip", no_argument, NULL, 's' },
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, 'V' },
};
static const char *short_opts = "shV";
static const char *usagestr =
"Usage: sqfs2tar [OPTIONS...] <sqfsfile>\n"
"\n"
"Read an input squashfs archive and turn it into a tar archive, written\n"
"to stdout.\n"
"\n"
"Possible options:\n"
"\n"
" --no-skip Abort if a file cannot be stored in a tar\n"
" archive. By default, it is simply skipped\n"
" and a warning is written to stderr."
"\n"
" --help, -h Print help text and exit.\n"
" --version, -V Print version information and exit.\n"
"\n"
"Examples:\n"
"\n"
"\tsqfs2tar rootfs.sqfs > rootfs.tar\n"
"\tsqfs2tar rootfs.sqfs | gzip > rootfs.tar.gz\n"
"\tsqfs2tar rootfs.sqfs | xz > rootfs.tar.xz\n"
"\n";
static const char *filename;
static unsigned int record_counter;
static bool dont_skip = false;
static void process_args(int argc, char **argv)
{
int i;
for (;;) {
i = getopt_long(argc, argv, short_opts, long_opts, NULL);
if (i == -1)
break;
switch (i) {
case 's':
dont_skip = true;
break;
case 'h':
fputs(usagestr, stdout);
exit(EXIT_SUCCESS);
case 'V':
print_version();
exit(EXIT_SUCCESS);
default:
goto fail_arg;
}
}
if (optind >= argc) {
fputs("Missing argument: squashfs image\n", stderr);
goto fail_arg;
}
filename = argv[optind++];
if (optind < argc) {
fputs("Unknown extra arguments\n", stderr);
goto fail_arg;
}
return;
fail_arg:
fputs("Try `sqfs2tar --help' for more information.\n", stderr);
exit(EXIT_FAILURE);
}
static int terminate_archive(void)
{
char buffer[1024];
ssize_t ret;
memset(buffer, '\0', sizeof(buffer));
ret = write_retry(STDOUT_FILENO, buffer, sizeof(buffer));
if (ret < 0) {
perror("adding archive terminator");
return -1;
}
if ((size_t)ret < sizeof(buffer)) {
fputs("adding archive terminator: truncated write\n", stderr);
return -1;
}
return 0;
}
static int write_tree_dfs(fstree_t *fs, tree_node_t *n, data_reader_t *data)
{
char *name, *target;
struct stat sb;
int ret;
if (n->parent != NULL || !S_ISDIR(n->mode)) {
name = fstree_get_path(n);
if (name == NULL) {
perror("resolving tree node path");
return -1;
}
assert(canonicalize_name(name) == 0);
fstree_node_stat(fs, n, &sb);
target = S_ISLNK(sb.st_mode) ? n->data.slink_target : NULL;
ret = write_tar_header(STDOUT_FILENO, &sb, name, target,
record_counter++);
if (ret > 0) {
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;
}
free(name);
if (ret < 0)
return -1;
if (S_ISREG(n->mode)) {
if (data_reader_dump_file(data, n->data.file,
STDOUT_FILENO, false)) {
return -1;
}
if (padd_file(STDOUT_FILENO, n->data.file->size, 512))
return -1;
}
}
if (S_ISDIR(n->mode)) {
for (n = n->data.dir->children; n != NULL; n = n->next) {
if (write_tree_dfs(fs, n, data))
return -1;
}
}
return 0;
}
int main(int argc, char **argv)
{
data_reader_t *data = NULL;
int status = EXIT_FAILURE;
sqfs_super_t super;
compressor_t *cmp;
fstree_t fs;
int sqfsfd;
process_args(argc, argv);
sqfsfd = open(filename, O_RDONLY);
if (sqfsfd < 0) {
perror(filename);
return EXIT_FAILURE;
}
if (sqfs_super_read(&super, sqfsfd))
goto out_fd;
if (!compressor_exists(super.compression_id)) {
fputs("Image uses a compressor that has not been built in\n",
stderr);
goto out_fd;
}
cmp = compressor_create(super.compression_id, false,
super.block_size, NULL);
if (cmp == NULL)
goto out_fd;
if (super.flags & SQFS_FLAG_COMPRESSOR_OPTIONS) {
if (cmp->read_options(cmp, sqfsfd))
goto out_cmp;
}
if (deserialize_fstree(&fs, &super, cmp, sqfsfd, 0))
goto out_cmp;
data = data_reader_create(sqfsfd, &super, cmp);
if (data == NULL)
goto out_fs;
if (write_tree_dfs(&fs, fs.root, data))
goto out_data;
if (terminate_archive())
goto out_data;
status = EXIT_SUCCESS;
out_data:
data_reader_destroy(data);
out_fs:
fstree_cleanup(&fs);
out_cmp:
cmp->destroy(cmp);
out_fd:
close(sqfsfd);
return status;
}
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