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/*
Copyright 2018-2022, Barcelona Supercomputing Center (BSC), Spain
Copyright 2015-2022, Johannes Gutenberg Universitaet Mainz, Germany
This software was partially supported by the
EC H2020 funded project NEXTGenIO (Project ID: 671951, www.nextgenio.eu).
This software was partially supported by the
ADA-FS project under the SPPEXA project funded by the DFG.
This file is part of GekkoFS.
GekkoFS is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
GekkoFS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GekkoFS. If not, see <https://www.gnu.org/licenses/>.
SPDX-License-Identifier: GPL-3.0-or-later
*/
/* C++ includes */
#include <CLI11/CLI11.hpp>
#include <nlohmann/json.hpp>
#include <memory>
#include <fmt/format.h>
#include <commands.hpp>
#include <reflection.hpp>
#include <serialize.hpp>
/* C includes */
#include <sys/types.h>
#include <sys/vfs.h>
#include <unistd.h>
using json = nlohmann::json;
struct statfs_options {
bool verbose{};
std::string pathname;
REFL_DECL_STRUCT(statfs_options, REFL_DECL_MEMBER(bool, verbose),
REFL_DECL_MEMBER(std::string, pathname));
};
struct statfs_output {
int retval;
int errnum;
struct ::statfs statfsbuf;
REFL_DECL_STRUCT(statfs_output, REFL_DECL_MEMBER(int, retval),
REFL_DECL_MEMBER(int, errnum),
REFL_DECL_MEMBER(struct ::statfs, statfsbuf));
};
void
to_json(json& record, const statfs_output& out) {
record = serialize(out);
}
void
statfs_exec(const statfs_options& opts) {
struct ::statfs statfsbuf;
auto rv = ::statfs(opts.pathname.c_str(), &statfsbuf);
if(opts.verbose) {
fmt::print("statfs(pathname=\"{}\") = {}, errno: {} [{}]\n",
opts.pathname, rv, errno, ::strerror(errno));
return;
}
json out = statfs_output{rv, errno, statfsbuf};
fmt::print("{}\n", out.dump(2));
}
void
statfs_init(CLI::App& app) {
// Create the option and subcommand objects
auto opts = std::make_shared<statfs_options>();
auto* cmd = app.add_subcommand("statfs", "Execute the statfs() system call");
// Add options to cmd, binding them to opts
cmd->add_flag("-v,--verbose", opts->verbose,
"Produce human readable output");
cmd->add_option("pathname", opts->pathname, "Directory name")
->required()
->type_name("");
cmd->callback([opts]() { statfs_exec(*opts); });
}