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/* SPDX-License-Identifier: GPL-3.0-or-later */
#include "rdsquashfs.h"
static tree_node_t *find_node(tree_node_t *n, const char *path)
{
const char *end;
size_t len;
while (path != NULL && *path != '\0') {
if (!S_ISDIR(n->mode)) {
errno = ENOTDIR;
return NULL;
}
end = strchrnul(path, '/');
len = end - path;
for (n = n->data.dir->children; n != NULL; n = n->next) {
if (strncmp(path, n->name, len) != 0)
continue;
if (n->name[len] != '\0')
continue;
break;
}
if (n == NULL) {
errno = ENOENT;
return NULL;
}
path = *end ? (end + 1) : end;
}
return n;
}
int main(int argc, char **argv)
{
int status = EXIT_FAILURE;
data_reader_t *data = NULL;
sqfs_super_t super;
compressor_t *cmp;
tree_node_t *n;
options_t opt;
fstree_t fs;
int sqfsfd;
process_command_line(&opt, argc, argv);
sqfsfd = open(opt.image_name, O_RDONLY);
if (sqfsfd < 0) {
perror(opt.image_name);
goto out_cmd;
}
if (sqfs_super_read(&super, sqfsfd))
goto out_fd;
if ((super.version_major != SQFS_VERSION_MAJOR) ||
(super.version_minor != SQFS_VERSION_MINOR)) {
fprintf(stderr,
"The image uses squashfs version %d.%d\n"
"We currently only supports version %d.%d (sorry).\n",
super.version_major, super.version_minor,
SQFS_VERSION_MAJOR, SQFS_VERSION_MINOR);
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, opt.rdtree_flags))
goto out_cmp;
switch (opt.op) {
case OP_LS:
n = find_node(fs.root, opt.cmdpath);
if (n == NULL) {
perror(opt.cmdpath);
goto out_fs;
}
list_files(n);
break;
case OP_CAT:
n = find_node(fs.root, opt.cmdpath);
if (n == NULL) {
perror(opt.cmdpath);
goto out_fs;
}
if (!S_ISREG(n->mode)) {
fprintf(stderr, "/%s: not a regular file\n",
opt.cmdpath);
goto out_fs;
}
data = data_reader_create(sqfsfd, &super, cmp);
if (data == NULL)
goto out_fs;
if (data_reader_dump_file(data, n->data.file, STDOUT_FILENO))
goto out_fs;
break;
case OP_UNPACK:
n = find_node(fs.root, opt.cmdpath);
if (n == NULL) {
perror(opt.cmdpath);
goto out_fs;
}
data = data_reader_create(sqfsfd, &super, cmp);
if (data == NULL)
goto out_fs;
if (restore_fstree(opt.unpack_root, n, data, opt.flags))
goto out_fs;
break;
case OP_DESCRIBE:
describe_tree(fs.root, opt.unpack_root);
break;
}
status = EXIT_SUCCESS;
out_fs:
if (data != NULL)
data_reader_destroy(data);
fstree_cleanup(&fs);
out_cmp:
cmp->destroy(cmp);
out_fd:
close(sqfsfd);
out_cmd:
free(opt.cmdpath);
return status;
}
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