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/*
* iso.cc - Implementation of the CD image Horizon Image Creation backend
* image, the image processing utilities for
* Project Horizon
*
* Copyright (c) 2020 Adélie Linux and contributors. All rights reserved.
* This code is licensed under the AGPL 3.0 license, as noted in the
* LICENSE-code file in the root directory of this repository.
*
* SPDX-License-Identifier: AGPL-3.0-only
*/
#include <fstream>
#include "basic.hh"
#include "hscript/util.hh"
#include "util/filesystem.hh"
#include "util/output.hh"
namespace Horizon {
namespace Image {
class CDBackend : public BasicBackend {
public:
enum CDError {
COMMAND_MISSING = 1,
FS_ERROR,
COMMAND_ERROR
};
explicit CDBackend(const std::string &ir, const std::string &out,
const std::map<std::string, std::string> &opts)
: BasicBackend(ir, out, opts) {};
int prepare() override {
error_code ec;
output_info("CD backend", "probing SquashFS tools version...");
if(run_command("mksquashfs", {"-version"}) != 0) {
output_error("CD backend", "SquashFS tools are not present");
return COMMAND_MISSING;
}
/* REQ: ISO.1 */
if(fs::exists(this->ir_dir, ec)) {
output_info("CD backend", "removing old IR tree", this->ir_dir);
fs::remove_all(this->ir_dir, ec);
if(ec) {
output_warning("CD backend", "could not remove IR tree",
ec.message());
/* we can _try_ to proceed anyway... */
}
}
/* REQ: ISO.2 */
fs::create_directory(this->ir_dir, ec);
if(ec && ec.value() != EEXIST) {
output_error("CD backend", "could not create IR directory",
ec.message());
return FS_ERROR;
}
/* REQ: ISO.2 */
fs::create_directory(this->ir_dir + "/cdroot", ec);
if(ec && ec.value() != EEXIST) {
output_error("CD backend", "could not create ISO directory",
ec.message());
return FS_ERROR;
}
/* REQ: ISO.2 */
fs::create_directory(this->ir_dir + "/target", ec);
if(ec && ec.value() != EEXIST) {
output_error("CD backend", "could not create target directory",
ec.message());
return FS_ERROR;
}
/* REQ: ISO.4 */
fs::create_directories(this->ir_dir + "/target/etc/default", ec);
if(ec && ec.value() != EEXIST) {
output_error("CD backend", "could not create target config dir",
ec.message());
return FS_ERROR;
}
/* REQ: ISO.4 */
std::ofstream grub(this->ir_dir + "/target/etc/default/grub");
grub << "ADELIE_MANUAL_CONFIG=1" << std::endl;
if(grub.fail() || grub.bad()) {
output_error("CD backend", "failed to configure GRUB");
return FS_ERROR;
}
grub.close();
return 0;
}
int create() override {
std::string my_arch;
std::ifstream archstream(this->ir_dir + "/target/etc/apk/arch");
const std::string target = this->ir_dir + "/target";
const std::string cdpath = this->ir_dir + "/cdroot";
archstream >> my_arch;
/* REQ: ISO.7 */
fs::create_directory(target + "/target");
fs::create_directories(target + "/media/live");
/* REQ: ISO.9 */
std::ofstream mtab(target + "/etc/conf.d/mtab");
if(!mtab) {
output_error("CD backend", "failed to open mtab configuration");
return FS_ERROR;
}
mtab << "mtab_is_file=no" << std::endl;
if(mtab.fail() || mtab.bad()) {
output_error("CD backend", "failed to write mtab configuration");
return FS_ERROR;
}
mtab.close();
/* REQ: ISO.10 */
const std::string targetsi = target + "/etc/runlevels/sysinit/";
fs::create_symlink("/etc/init.d/udev", targetsi + "udev");
fs::create_symlink("/etc/init.d/udev-trigger",
targetsi + "udev-trigger");
fs::create_symlink("/etc/init.d/lvmetad", targetsi + "lvmetad");
const std::string squashpath = cdpath + "/" + my_arch + ".squashfs";
/* REQ: ISO.22 */
{
std::ofstream exclude(this->ir_dir + "/exclude.list");
exclude << "dev/*" << std::endl
<< "proc/*" << std::endl
<< "sys/*" << std::endl;
if(exclude.fail() || exclude.bad()) {
output_error("CD backend", "failed to write exclusion list");
return FS_ERROR;
}
exclude.flush();
exclude.close();
}
/* REQ: ISO.22 */
if(run_command("mksquashfs", {target, squashpath, "-noappend",
"-wildcards", "-ef",
this->ir_dir + "/exclude.list"}) != 0) {
output_error("CD backend", "failed to create SquashFS");
return COMMAND_ERROR;
}
return 0;
}
int finalise() override {
return 0;
}
};
__attribute__((constructor(400)))
void register_cd_backend() {
BackendManager::register_backend(
{"iso", "Create a CD image (.iso)",
[](const std::string &ir_dir, const std::string &out_path,
const std::map<std::string, std::string> &opts) {
return new CDBackend(ir_dir, out_path, opts);
}
});
}
}
}
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