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/* lcfs
Copyright (C) 2023 Alexander Larsson <alexl@redhat.com>
SPDX-License-Identifier: GPL-2.0-or-later OR Apache-2.0
*/
#define _GNU_SOURCE
#include "config.h"
#include "libcomposefs/lcfs-writer.h"
#include "libcomposefs/lcfs-utils.h"
#include <stdio.h>
#include <string.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
static void usage(const char *argv0)
{
fprintf(stderr, "usage: %s SRC DEST\n", argv0);
}
static ssize_t write_cb(void *_file, void *buf, size_t count)
{
FILE *file = _file;
return fwrite(buf, 1, count, file);
}
int main(int argc, char **argv)
{
const char *bin = argv[0];
int fd, version;
struct lcfs_node_s *root;
const char *src_path = NULL;
const char *dst_path = NULL;
struct lcfs_write_options_s options = { 0 };
if (argc <= 1) {
fprintf(stderr, "No source path specified\n");
usage(bin);
exit(1);
}
src_path = argv[1];
if (argc <= 2) {
fprintf(stderr, "No destination path specified\n");
usage(bin);
exit(1);
}
dst_path = argv[2];
fd = open(src_path, O_RDONLY | O_CLOEXEC);
if (fd < 0) {
err(EXIT_FAILURE, "Failed to open '%s'", src_path);
}
version = lcfs_version_from_fd(fd);
if (version < 0) {
err(EXIT_FAILURE, "Failed to get image version '%s'", src_path);
}
root = lcfs_load_node_from_fd(fd);
if (root == NULL) {
err(EXIT_FAILURE, "Failed to load '%s'", src_path);
}
close(fd);
options.format = LCFS_FORMAT_EROFS;
options.version = version;
FILE *out_file = fopen(dst_path, "we");
if (out_file == NULL)
err(EXIT_FAILURE, "failed to open '%s'", dst_path);
options.file = out_file;
options.file_write_cb = write_cb;
if (lcfs_write_to(root, &options) < 0)
err(EXIT_FAILURE, "cannot write file");
lcfs_node_unref(root);
return 0;
}
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