63c372cb9d
After all it is now much more like strjoin() than strappend(). At the same time, add support for NULL sentinels, even if they are normally not necessary.
76 lines
2 KiB
C
76 lines
2 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
|
|
|
|
/***
|
|
This file is part of systemd.
|
|
|
|
Copyright 2012 Lennart Poettering
|
|
|
|
systemd is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 of the License, or
|
|
(at your option) any later version.
|
|
|
|
systemd 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
|
***/
|
|
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
|
|
#include "log.h"
|
|
#include "util.h"
|
|
#include "unit-name.h"
|
|
#include "path-util.h"
|
|
|
|
/*
|
|
* Implements the logic described in
|
|
* http://freedesktop.org/wiki/Software/systemd/SystemUpdates
|
|
*/
|
|
|
|
static const char *arg_dest = "/tmp";
|
|
|
|
static int generate_symlink(void) {
|
|
const char *p = NULL;
|
|
|
|
if (laccess("/system-update", F_OK) < 0) {
|
|
if (errno == ENOENT)
|
|
return 0;
|
|
|
|
log_error_errno(errno, "Failed to check for system update: %m");
|
|
return -EINVAL;
|
|
}
|
|
|
|
p = strjoina(arg_dest, "/default.target");
|
|
if (symlink(SYSTEM_DATA_UNIT_PATH "/system-update.target", p) < 0)
|
|
return log_error_errno(errno, "Failed to create symlink %s: %m", p);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int main(int argc, char *argv[]) {
|
|
int r;
|
|
|
|
if (argc > 1 && argc != 4) {
|
|
log_error("This program takes three or no arguments.");
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
if (argc > 1)
|
|
arg_dest = argv[2];
|
|
|
|
log_set_target(LOG_TARGET_SAFE);
|
|
log_parse_environment();
|
|
log_open();
|
|
|
|
umask(0022);
|
|
|
|
r = generate_symlink();
|
|
|
|
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
|
|
}
|