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/*
* creator.cc - Implementation of the HorizonScript image creator
* 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 <boost/program_options.hpp>
#include <cstdlib> /* EXIT_* */
#include <string>
#include "backends/basic.hh"
#include "hscript/script.hh"
#include "util/output.hh"
bool pretty = true; /*! Controls ASCII colour output */
#define DESCR_TEXT "Usage: hscript-image [OPTION]... [INSTALLFILE]\n"\
"Write an operating system image configured per INSTALLFILE"
/*! Text used at the top of usage output */
/*! Entry-point for the image creation utility. */
int main(int argc, char *argv[]) {
using namespace boost::program_options;
using namespace Horizon::Image;
bool needs_help{}, disable_pretty{}, version_only{};
int exit_code = EXIT_SUCCESS;
std::string if_path{"/etc/horizon/installfile"}, ir_dir{"/target"},
output_path{"image.tar"}, type_code{"tar"};
BasicBackend *backend = nullptr;
Horizon::ScriptOptions opts;
Horizon::Script *my_script;
options_description ui{DESCR_TEXT};
options_description general{"General options"};
general.add_options()
("help,h", bool_switch(&needs_help), "Display this message.")
("no-colour,n", bool_switch(&disable_pretty), "Do not 'prettify' output.")
("version,v", bool_switch(&version_only), "Show program version information.")
;
options_description target{"Target control options"};
target.add_options()
("output,o", value<std::string>()->default_value("image.tar"), "Desired filename for the output file.")
("type,t", value<std::string>()->default_value("tar"), "Type of output file to generate. Use 'list' for a list of supported types.")
("ir-dir,i", value<std::string>()->default_value("/target"), "Where to store intermediate files.")
;
ui.add(general).add(target);
options_description all;
all.add(ui).add_options()("installfile", value<std::string>()->default_value(if_path), "The HorizonScript to use for configuring the image.");
positional_options_description positional;
positional.add("installfile", 1);
command_line_parser parser{argc, argv};
parser.options(all);
parser.positional(positional);
variables_map vm;
try {
auto result = parser.run();
store(result, vm);
notify(vm);
} catch(const std::exception &ex) {
std::cerr << ex.what() << std::endl;
exit_code = EXIT_FAILURE;
needs_help = true;
}
/* --help, or usage failure */
if(needs_help) {
std::cout << ui << std::endl;
return exit_code;
}
/* -n/--no-colour, or logging to file */
if(disable_pretty || !isatty(1)) {
pretty = false;
} else {
opts.set(Horizon::Pretty);
}
if(!vm["type"].empty()) {
type_code = vm["type"].as<std::string>();
}
if(type_code == "list") {
std::cout << "Type codes known by this build of Image Creation:"
<< std::endl << std::endl;
for(const auto &candidate : BackendManager::available_backends()) {
std::cout << std::setw(10) << std::left << candidate.type_code
<< candidate.description << std::endl;
}
return EXIT_SUCCESS;
}
if(!vm["installfile"].empty()) {
if_path = vm["installfile"].as<std::string>();
}
if(!vm["ir-dir"].empty()) {
ir_dir = vm["ir-dir"].as<std::string>();
}
if(!vm["output"].empty()) {
output_path = vm["output"].as<std::string>();
}
/* Announce our presence */
bold_if_pretty(std::cout);
std::cout << "HorizonScript Image Creation Utility version " << VERSTR
<< std::endl;
reset_if_pretty(std::cout);
std::cout << "Copyright (c) 2020 Adélie Linux and contributors."
<< std::endl
<< "This software is licensed to you under the terms of the "
<< std::endl << "AGPL 3.0 license, unless otherwise noted."
<< std::endl << std::endl;
if(version_only) {
return EXIT_SUCCESS;
}
/* Load the proper backend. */
for(const auto &candidate : BackendManager::available_backends()) {
if(candidate.type_code == type_code) {
backend = candidate.creation_fn(ir_dir, output_path);
break;
}
}
if(backend == nullptr) {
output_error("command-line", "unsupported backend or internal error",
type_code);
return EXIT_FAILURE;
}
opts.set(Horizon::InstallEnvironment);
opts.set(Horizon::ImageOnly);
if(if_path == "-") {
/* Unix-style stdin specification */
my_script = Horizon::Script::load(std::cin, opts);
} else {
my_script = Horizon::Script::load(if_path, opts);
}
/* if an error occurred during parsing, bail out now */
if(!my_script) {
exit_code = EXIT_FAILURE;
goto early_trouble;
} else {
int ret;
my_script->setTargetDirectory(ir_dir);
if(!my_script->execute()) {
exit_code = EXIT_FAILURE;
goto trouble;
}
#define RUN_PHASE_OR_TROUBLE(_PHASE, _FRIENDLY) \
ret = backend->_PHASE();\
if(ret != 0) {\
output_error("internal", "error during output " _FRIENDLY,\
std::to_string(ret));\
exit_code = EXIT_FAILURE;\
goto trouble;\
}
RUN_PHASE_OR_TROUBLE(prepare, "preparation");
RUN_PHASE_OR_TROUBLE(create, "creation");
RUN_PHASE_OR_TROUBLE(finalise, "finalisation");
}
trouble: /* delete the Script and exit */
delete my_script;
early_trouble: /* no script yet */
delete backend;
return exit_code;
}
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