/* Copyright (C) 2018  Causal Agent June <june@causal.agency>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <err.h>
#include <fcntl.h>
#include <sysexits.h>
#include <unistd.h>

int main(int argc, char *argv[]) {
    if (argc < 2) errx(EX_USAGE, "missing private id");

    int fd = open("private", 0);
    if (fd < 0) err(EX_NOINPUT, "private");

    const char *private = argv[1];
    char public[sizeof("../public/") + 32] = {0};
    ssize_t n = readlinkat(fd, private, public, sizeof(public) - 1);
    if (n < 0) err(EX_NOINPUT, "%s", private);

    int error = unlinkat(fd, public, 0);
    if (error) err(EX_NOINPUT, "%s", public);

    error = unlinkat(fd, private, 0);
    if (error) err(EX_NOINPUT, "%s", private);

    return EX_OK;
}