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78 lines
2.0 KiB
C
78 lines
2.0 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2012 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <unistd.h>
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#include "log.h"
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#include "util.h"
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#include "unit-name.h"
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#include "path-util.h"
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/*
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* Implements the logic described in
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* http://freedesktop.org/wiki/Software/systemd/SystemUpdates
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*/
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static const char *arg_dest = "/tmp";
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static int generate_symlink(void) {
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const char *p = NULL;
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if (access("/system-update", F_OK) < 0) {
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if (errno == ENOENT)
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return 0;
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log_error("Failed to check for system update: %m");
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return -EINVAL;
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}
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p = strappenda(arg_dest, "/default.target");
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if (symlink(SYSTEM_DATA_UNIT_PATH "/system-update.target", p) < 0) {
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log_error("Failed to create symlink %s: %m", p);
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return -errno;
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}
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return 0;
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}
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int main(int argc, char *argv[]) {
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int r;
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if (argc > 1 && argc != 4) {
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log_error("This program takes three or no arguments.");
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return EXIT_FAILURE;
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}
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if (argc > 1)
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arg_dest = argv[2];
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log_set_target(LOG_TARGET_SAFE);
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log_parse_environment();
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log_open();
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umask(0022);
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r = generate_symlink();
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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