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/*
swclock.c
Sets the system time from the mtime of the given file.
This is useful for systems who do not have a working RTC and rely on ntp.
OpenRC relies on the correct system time for a lot of operations so this is needed
quite early.
*/
/*
* Copyright (c) 2009 Roy Marples <roy@marples.name>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <unistd.h>
#include <utime.h>
#include "builtins.h"
#include "einfo.h"
#include "rc-misc.h"
#define RC_SHUTDOWNTIME RC_SVCDIR "/shutdowntime"
extern const char *applet;
#include "_usage.h"
#define extraopts "file"
#define getoptstring "sw" getoptstring_COMMON
static const struct option longopts[] = {
{ "save", 0, NULL, 's' },
{ "warn", 0, NULL, 'w' },
longopts_COMMON
};
static const char * const longopts_help[] = {
"saves the time",
"no error if no reference file",
longopts_help_COMMON
};
#include "_usage.c"
int
swclock(int argc, char **argv)
{
int opt, sflag = 0, wflag = 0;
const char *file = RC_SHUTDOWNTIME;
struct stat sb;
struct timeval tv;
while ((opt = getopt_long(argc, argv, getoptstring,
longopts, (int *) 0)) != -1)
{
switch (opt) {
case 's':
sflag = 1;
break;
case 'w':
wflag = 1;
break;
case_RC_COMMON_GETOPT;
}
}
if (optind < argc)
file = argv[optind++];
if (sflag) {
if (stat(file, &sb) == -1) {
opt = open(file, O_WRONLY | O_CREAT, 0644);
if (opt == -1)
eerrorx("swclock: open: %s", strerror(errno));
close(opt);
} else
if (utime(file, NULL) == -1)
eerrorx("swclock: utime: %s", strerror(errno));
return 0;
}
if (stat(file, &sb) == -1) {
if (wflag != 0 && errno == ENOENT)
ewarn("swclock: `%s': %s", file, strerror(errno));
else
eerrorx("swclock: `%s': %s", file, strerror(errno));
return 0;
}
tv.tv_sec = sb.st_mtime;
tv.tv_usec = 0;
if (settimeofday(&tv, NULL) == -1)
eerrorx("swclock: settimeofday: %s", strerror(errno));
return 0;
}
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