Add new utility and init script swclock that sets the system time based on

the mtime of a file. It saves the shutdown time to this file also.
This is handy for systems without a working RTC chip.
Based on an idea by Michael A. Smith <michael@smith-li.com>.
Fixes Gentoo #272073.

src/includes/rc-misc.h

@@ -35,6 +35,7 @@
 #include <sys/stat.h>
 #include <errno.h>
 #include <stdbool.h>
+#include <stdlib.h>
 #include <string.h>
 
 #define RC_LEVEL_BOOT           "boot"

src/rc/.gitignore

@@ -38,6 +38,7 @@ service_crashed
 checkpath
 fstabinfo
 mountinfo
+swclock
 rc-depend
 service_get_value
 service_set_value
@@ -59,6 +60,7 @@ checkpath.o
 fstabinfo.o
 mountinfo.o
 start-stop-daemon.o
+swclock.o
 rc-applets.o
 rc-depend.o
 rc-logger.o

src/rc/Makefile

@@ -2,7 +2,7 @@ PROG=		rc
 SRCS=		checkpath.c fstabinfo.c mountinfo.c start-stop-daemon.c \
 		rc-applets.c rc-depend.c rc-logger.c \
 		rc-misc.c rc-plugin.c rc-service.c rc-status.c rc-update.c \
-		runscript.c rc.c
+		runscript.c rc.c swclock.c
 
 CLEANFILES=	version.h
 
@@ -26,7 +26,7 @@ RC_SBINLINKS=	mark_service_starting mark_service_started \
 		mark_service_stopping mark_service_stopped \
 		mark_service_inactive mark_service_wasinactive \
 		mark_service_hotplugged mark_service_failed \
-		rc-abort
+		rc-abort swclock
 ALL_LINKS=	${BINLINKS} ${SBINLINKS} ${RC_BINLINKS} ${RC_SBINLINKS}
 CLEANFILES+=	${ALL_LINKS}
 

src/rc/builtins.h

@@ -35,6 +35,7 @@ int rc_status(int, char **);
 int rc_update(int, char **);
 int runscript(int, char **);
 int start_stop_daemon(int, char **);
+int swclock(int, char **);
 
 void run_applets(int, char **);
 

src/rc/rc-applets.c

@@ -449,6 +449,8 @@ run_applets(int argc, char **argv)
 		exit(start_stop_daemon(argc, argv));
 	else if (strcmp (applet, "checkpath") == 0)
 		exit(checkpath(argc, argv));
+	else if (strcmp(applet, "swclock") == 0)
+		exit(swclock(argc, argv));
 
 	/* These could also be applications in their own right */
 	if (strcmp(applet, "shell_var") == 0)

src/rc/swclock.c

@@ -0,0 +1,110 @@
+/*
+  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>
+ * All rights reserved
+
+ * 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 "s" getoptstring_COMMON
+static const struct option longopts[] = {
+	{ "save", 0, NULL, 's' },
+	longopts_COMMON
+};
+static const char * const longopts_help[] = {
+	"saves the time",
+	longopts_help_COMMON
+};
+#include "_usage.c"
+
+int
+swclock(int argc, char **argv)
+{
+	int opt, sflag = 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_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)
+		eerrorx("swclock: `%s': %s", file, strerror(errno));
+
+	tv.tv_sec = sb.st_mtime;
+	tv.tv_usec = 0;
+
+	if (settimeofday(&tv, NULL) == -1)
+		eerrorx("swclock: settimeofday: %s", strerror(errno));
+
+	return 0;
+}