We now warn about clock skews

rc-update -u will force a regen of the dep tree
rc_newer_than and rc_olderthan now take another two parameters for newest/oldest file and mtime

init.d/savecache.in

@@ -1,11 +1,18 @@
 #!@PREFIX@/sbin/runscript
-# Copyright 2007-2008 Roy Marples <roy@marples.name>
+# Copyright 2007-2009 Roy Marples <roy@marples.name>
 # All rights reserved. Released under the 2-clause BSD license.
 
 description="Saves the caches OpenRC uses to non volatile storage"
 
 start()
 {
+	if [ -e "${RC_SVCDIR}"/clock-skewed ]; then
+		ewarn "WARNING: clock skew detected!"
+		if ! yesno "savecache_skewed"; then
+			eerror "Not saving deptree cache"
+			return 1
+		fi
+	fi
 	ebegin "Saving dependency cache"
 	if [ ! -d "${RC_LIBDIR}"/cache ]; then
 		rm -rf "${RC_LIBDIR}"/cache

man/rc-update.8

@@ -1,4 +1,4 @@
-.\" Copyright 2007-2008 Roy Marples
+.\" Copyright 2007-2009 Roy Marples
 .\" All rights reserved
 .\"
 .\" Redistribution and use in source and binary forms, with or without
@@ -22,7 +22,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd Jan 15, 2008
+.Dd Jan 10, 2009
 .Dt RC-UPDATE 8 SMM
 .Os OpenRC
 .Sh NAME
@@ -38,6 +38,7 @@
 .Ar service
 .Op Ar runlevel ...
 .Nm
+.Op Fl u , -update
 .Op Fl v , -verbose
 .Ar show
 .Op Ar runlevel ...
@@ -53,7 +54,7 @@ or
 directories. They must also conform to the OpenRC runscript standard.
 .Pp
 .Bl -tag -width "Fl a , -delete service"
-.It Fl a , -add Ar service
+.It Ar add Ar service
 Add the
 .Ar service
 to the
@@ -72,6 +73,10 @@ Show all enabled services and the runlevels they belong to.  If you specify
 runlevels to show, then only those will be included in the output.
 .It Fl v , -verbose
 Show all services.
+.It Fl u , -update
+Forces an update of the dependency tree cache.
+This may be needed in the even of clock skew (a file in /etc is newer than the
+system clock).
 .El
 .Sh SEE ALSO
 .Xr rc 8 ,

src/librc/librc-depend.c

@@ -4,7 +4,7 @@
    */
 
 /*
- * Copyright 2007-2008 Roy Marples <roy@marples.name>
+ * Copyright 2007-2009 Roy Marples <roy@marples.name>
  * All rights reserved
 
  * Redistribution and use in source and binary forms, with or without
@@ -544,7 +544,8 @@ rc_deptree_order(const RC_DEPTREE *deptree, const char *runlevel, int options)
 librc_hidden_def(rc_deptree_order)
 
 static bool
-mtime_check(const char *source, const char *target, bool newer)
+mtime_check(const char *source, const char *target, bool newer,
+	    char *file, time_t *rel)
 {
 	struct stat buf;
 	time_t mtime;
@@ -565,16 +566,32 @@ mtime_check(const char *source, const char *target, bool newer)
 
 	if (newer) {
 		if (mtime < buf.st_mtime)
-			return false;
+			retval = false;
+		if (rel != NULL) {
+			if (*rel < buf.st_mtime) {
+				if (file)
+					strlcpy(file, target, PATH_MAX);
+				*rel = buf.st_mtime;
+			}
+		} else
+			return retval;
 	} else {
 		if (mtime > buf.st_mtime)
-			return false;
+			retval = false;
+		if (rel != NULL) {
+			if (*rel > buf.st_mtime) {
+				if (file)
+					strlcpy(file, target, PATH_MAX);
+				*rel = buf.st_mtime;
+			}
+		} else
+			return retval;
 	}
 
 	/* If not a dir then reset errno */
 	if (!(dp = opendir(target))) {
 		errno = serrno;
-		return true;
+		return retval;
 	}
 
 	/* Check all the entries in the dir */
@@ -582,26 +599,30 @@ mtime_check(const char *source, const char *target, bool newer)
 		if (d->d_name[0] == '.')
 			continue;
 		snprintf(path, sizeof(path), "%s/%s", target, d->d_name);
-		retval = mtime_check(source, path, newer);
+		if (!mtime_check(source, path, newer, file, rel)) {
-		if (!retval)
+			retval = false;
+			if (rel == NULL)
 				break;
 		}
+	}
 	closedir(dp);
 	return retval;
 }
 
 bool
-rc_newer_than(const char *source, const char *target)
+rc_newer_than(const char *source, const char *target,
+	      char *file, time_t *newest)
 {
 
-	return mtime_check(source, target, true);
+	return mtime_check(source, target, true, file, newest);
 }
 librc_hidden_def(rc_newer_than)
 
 bool
-rc_older_than(const char *source, const char *target)
+rc_older_than(const char *source, const char *target,
+	      char *file, time_t *oldest)
 {
-	return mtime_check(source, target, false);
+	return mtime_check(source, target, false, file, oldest);
 }
 librc_hidden_def(rc_older_than)
 
@@ -638,7 +659,7 @@ static const char *const depdirs[] =
 };
 
 bool
-rc_deptree_update_needed(void)
+rc_deptree_update_needed(char *file, time_t *newest)
 {
 	bool newer = false;
 	RC_STRINGLIST *config;
@@ -652,30 +673,38 @@ rc_deptree_update_needed(void)
 
 	/* Quick test to see if anything we use has changed and we have
 	 * data in our deptree */
-	if (!existss(RC_DEPTREE_CACHE) ||
+	if (!existss(RC_DEPTREE_CACHE))
-	    !rc_newer_than(RC_DEPTREE_CACHE, RC_INITDIR) ||
+		return true;
-	    !rc_newer_than(RC_DEPTREE_CACHE, RC_CONFDIR) ||
+	if (!rc_newer_than(RC_DEPTREE_CACHE, RC_INITDIR, file, newest))
+		newer = true;
+	if (!rc_newer_than(RC_DEPTREE_CACHE, RC_CONFDIR, file, newest))
+		newer = true;
 #ifdef RC_PKG_INITDIR
-	    !rc_newer_than(RC_DEPTREE_CACHE, RC_PKG_INITDIR) ||
+	if (!rc_newer_than(RC_DEPTREE_CACHE, RC_PKG_INITDIR, file, newest))
+		newer = true;
 #endif
 #ifdef RC_PKG_CONFDIR
-	    !rc_newer_than(RC_DEPTREE_CACHE, RC_PKG_CONFDIR) ||
+	if (!rc_newer_than(RC_DEPTREE_CACHE, RC_PKG_CONFDIR, file, newest))
+		newer = true;
 #endif
 #ifdef RC_LOCAL_INITDIR
-	    !rc_newer_than(RC_DEPTREE_CACHE, RC_LOCAL_INITDIR) ||
+	if (!rc_newer_than(RC_DEPTREE_CACHE, RC_LOCAL_INITDIR, file, newest))
+		newer = true;
 #endif
 #ifdef RC_LOCAL_CONFDIR
-	    !rc_newer_than(RC_DEPTREE_CACHE, RC_LOCAL_CONFDIR) ||
+	if (!rc_newer_than(RC_DEPTREE_CACHE, RC_LOCAL_CONFDIR, file, newest))
+		newer = true;
 #endif
-	    !rc_newer_than(RC_DEPTREE_CACHE, "/etc/rc.conf"))
+	if (!rc_newer_than(RC_DEPTREE_CACHE, "/etc/rc.conf", file, newest))
-		return true;
+		newer = true;
 
 	/* Some init scripts dependencies change depending on config files
 	 * outside of baselayout, like syslog-ng, so we check those too. */
 	config = rc_config_list(RC_DEPCONFIG);
 	TAILQ_FOREACH(s, config, entries) {
-		if (!rc_newer_than(RC_DEPTREE_CACHE, s->value)) {
+		if (!rc_newer_than(RC_DEPTREE_CACHE, s->value, file, newest)) {
 			newer = true;
+			if (newest == NULL)
 				break;
 		}
 	}

src/librc/rc.h.in

@@ -1,5 +1,5 @@
 /*
- * Copyright 2007-2008 Roy Marples <roy@marples.name>
+ * Copyright 2007-2009 Roy Marples <roy@marples.name>
  * All rights reserved
 
  * Redistribution and use in source and binary forms, with or without
@@ -304,25 +304,31 @@ typedef void *RC_DEPTREE;
 
 /*! Check to see if source is newer than target.
  * If target is a directory then we traverse it and it's children.
+ * time_t returns the time of the newest file found if newer.
 * @return true if source is newer than target, otherwise false */ 
-bool rc_newer_than(const char *, const char *);
+bool rc_newer_than(const char *, const char *, char *, time_t *);
 
-/*! Check to see if source is newer than target.
+/*! Check to see if source is older than target.
  * If target is a directory then we traverse it and it's children.
-* @return true if source is newer than target, otherwise false */ 
+ * time_t returns the time of the oldest file found if older.
-bool rc_older_than(const char *, const char *);
+* @return true if source is older than target, otherwise false */ 
+bool rc_older_than(const char *, const char *, char *, time_t *);
 
 /*! Update the cached dependency tree if it's older than any init script,
  * its configuration file or an external configuration file the init script
  * has specified.
+ * time_t returns the time of the newest file that the dependency tree
+ * will be checked against.
  * @return true if successful, otherwise false */
 bool rc_deptree_update(void);
 
 /*! Check if the cached dependency tree is older than any init script,
  * its configuration file or an external configuration file the init script
  * has specified.
+ * @param buffer of PATH_MAX to store newest file
+ * @param mtime of newest file
  * @return true if it needs updating, otherwise false */
-bool rc_deptree_update_needed(void);
+bool rc_deptree_update_needed(char *, time_t *);
 
 /*! Load the cached dependency tree and return a pointer to it.
  * This pointer should be freed with rc_deptree_free when done.

src/rc/builtins.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2007-2008 Roy Marples <roy@marples.name>
+ * Copyright 2007-2009 Roy Marples <roy@marples.name>
  * All rights reserved
 
  * Redistribution and use in source and binary forms, with or without
@@ -39,7 +39,7 @@ int start_stop_daemon(int, char **);
 void run_applets(int, char **);
 
 /* Handy function so we can wrap einfo around our deptree */
-RC_DEPTREE *_rc_deptree_load (int *);
+RC_DEPTREE *_rc_deptree_load (int, int *);
 
 /* Test to see if we can see pid 1 or not */
 bool _rc_can_find_pids(void);

src/rc/rc-applets.c

@@ -7,7 +7,7 @@
    */
 
 /*
- * Copyright 2007-2008 Roy Marples <roy@marples.name>
+ * Copyright 2007-2009 Roy Marples <roy@marples.name>
  * All rights reserved
 
  * Redistribution and use in source and binary forms, with or without
@@ -451,7 +451,7 @@ void run_applets(int argc, char **argv)
 		if (argc < 3)
 			exit (EXIT_FAILURE);
 		while (i < argc) {
-			if (!rc_newer_than(argv[1], argv[i++]))
+			if (!rc_newer_than(argv[1], argv[i++], NULL, NULL))
 				exit(EXIT_SUCCESS);
 		}
 		exit(EXIT_FAILURE);
@@ -461,7 +461,7 @@ void run_applets(int argc, char **argv)
 		if (argc < 3)
 			exit (EXIT_FAILURE);
 		while (i < argc) {
-			if (!rc_newer_than(argv[1], argv[i++]))
+			if (!rc_newer_than(argv[1], argv[i++], NULL, NULL))
 				exit(EXIT_FAILURE);
 		}
 		exit(EXIT_SUCCESS);

src/rc/rc-depend.c

@@ -4,7 +4,7 @@
    */
 
 /*
- * Copyright 2007-2008 Roy Marples <roy@marples.name>
+ * Copyright 2007-2009 Roy Marples <roy@marples.name>
  * All rights reserved
 
  * Redistribution and use in source and binary forms, with or without
@@ -29,17 +29,21 @@
  * SUCH DAMAGE.
  */
 
-#include <sys/types.h>
 #include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/types.h>
 
-#include <getopt.h>
 #include <errno.h>
 #include <fcntl.h>
+#include <getopt.h>
+#include <limits.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <time.h>
 #include <unistd.h>
+#include <utime.h>
 
 #include "builtins.h"
 #include "einfo.h"
@@ -49,13 +53,19 @@
 extern const char *applet;
 
 RC_DEPTREE *
-_rc_deptree_load(int *regen) {
+_rc_deptree_load(int force, int *regen) {
 	int fd;
 	int retval;
 	int serrno = errno;
 	int merrno;
+	time_t t;
+	char file[PATH_MAX];
+	struct stat st;
+	struct utimbuf ut;
+	FILE *fp;
 
-	if (rc_deptree_update_needed()) {
+	t = 0;
+	if (rc_deptree_update_needed(file, &t) || force != 0) {
 		/* Test if we have permission to update the deptree */
 		fd = open(RC_DEPTREE_CACHE, O_WRONLY);
 		merrno = errno;
@@ -67,8 +77,30 @@ _rc_deptree_load(int *regen) {
 		if (regen)
 			*regen = 1;
 		ebegin("Caching service dependencies");
-		retval = rc_deptree_update();
+		retval = rc_deptree_update() ? 0 : -1;
-		eend (retval ? 0 : -1, "Failed to update the dependency tree");
+		eend (retval, "Failed to update the dependency tree");
+
+		if (retval == 0) {
+			stat(RC_DEPTREE_CACHE, &st);
+			if (st.st_mtime < t) {
+				eerror("Clock skew detected with `%s'", file);
+				eerrorn("Adjusting mtime of `" RC_DEPTREE_CACHE
+				       "' to %s", ctime(&t));
+				fp = fopen(RC_DEPTREE_SKEWED, "w");
+				if (fp != NULL) {
+					fprintf(fp, RC_DEPTREE_SKEWED "\n");
+					fclose(fp);
+				}
+				ut.actime = t;
+				ut.modtime = t;
+				utime(RC_DEPTREE_CACHE, &ut);
+			} else {
+				if (exists(RC_DEPTREE_SKEWED))
+					unlink(RC_DEPTREE_SKEWED);
+			}
+		}
+		if (force == -1 && regen != NULL)
+			*regen = retval;
 	}
 	return rc_deptree_load();
 }
@@ -104,9 +136,8 @@ rc_depend(int argc, char **argv)
 	RC_STRINGLIST *depends;
 	RC_STRING *s;
 	RC_DEPTREE *deptree = NULL;
-	int options = RC_DEP_TRACE;
+	int options = RC_DEP_TRACE, update = 0;
 	bool first = true;
-	bool update = false;
 	char *runlevel = xstrdup(getenv("RC_RUNLEVEL"));
 	int opt;
 	char *token;
@@ -130,7 +161,7 @@ rc_depend(int argc, char **argv)
 				rc_stringlist_add(types, token);
 			break;
 		case 'u':
-			update = true;
+			update = 1;
 			break;
 		case 'T':
 			options &= RC_DEP_TRACE;
@@ -140,15 +171,7 @@ rc_depend(int argc, char **argv)
 		}
 	}
 
-	if (update) {
+	if (!(deptree = _rc_deptree_load(update, NULL)))
-		ebegin("Caching service dependencies");
-		update = rc_deptree_update();
-		eend(update ? 0 : -1, "%s: %s", applet, strerror(errno));
-		if (!update)
-			eerrorx("Failed to update the dependency tree");
-	}
-
-	if (!(deptree = _rc_deptree_load(NULL)))
 		eerrorx("failed to load deptree");
 
 	if (!runlevel)

src/rc/rc-status.c

@@ -4,7 +4,7 @@
    */
 
 /*
- * Copyright 2007-2008 Roy Marples <roy@marples.name>
+ * Copyright 2007-2009 Roy Marples <roy@marples.name>
  * All rights reserved
 
  * Redistribution and use in source and binary forms, with or without
@@ -140,7 +140,7 @@ print_services(const char *runlevel, RC_STRINGLIST *svcs)
 	if (!svcs)
 		return;
 	if (!deptree)
-		deptree = _rc_deptree_load(NULL);
+		deptree = _rc_deptree_load(0, NULL);
 	if (!deptree) {
 		TAILQ_FOREACH(s, svcs, entries)
 			if (!runlevel ||
@@ -260,7 +260,7 @@ rc_status(int argc, char **argv)
 	}
 
 	/* Output the services in the order in which they would start */
-	deptree = _rc_deptree_load(NULL);
+	deptree = _rc_deptree_load(0, NULL);
 
 	TAILQ_FOREACH(l, levels, entries) {
 		print_level(l->value);

src/rc/rc-update.c

@@ -4,7 +4,7 @@
    */
 
 /*
- * Copyright 2007-2008 Roy Marples <roy@marples.name>
+ * Copyright 2007-2009 Roy Marples <roy@marples.name>
  * All rights reserved
 
  * Redistribution and use in source and binary forms, with or without
@@ -138,11 +138,13 @@ show(RC_STRINGLIST *runlevels, bool verbose)
 	"Usage: rc-update [options] add service <runlevel>\n" \
 	"       rc-update [options] del service <runlevel>\n" \
 	"       rc-update [options] show"
-#define getoptstring getoptstring_COMMON
+#define getoptstring "u" getoptstring_COMMON
 static const struct option longopts[] = {
+	{ "update",          0, NULL, 'u' },
 	longopts_COMMON
 };
 static const char * const longopts_help[] = {
+	"Force an update of the dependency tree",
 	longopts_help_COMMON
 };
 #include "_usage.c"
@@ -169,6 +171,9 @@ rc_update(int argc, char **argv)
 	while ((opt = getopt_long(argc, argv, getoptstring,
 				  longopts, (int *)0)) != -1)
 		switch (opt) {
+		case 'u':
+			_rc_deptree_load(-1, &ret);
+			return ret;
 		case_RC_COMMON_GETOPT
 		}
 

src/rc/rc.c

@@ -9,7 +9,7 @@
  */
 
 /*
- * Copyright 2007-2008 Roy Marples <roy@marples.name>
+ * Copyright 2007-2009 Roy Marples <roy@marples.name>
  * All rights reserved
 
  * Redistribution and use in source and binary forms, with or without
@@ -944,8 +944,10 @@ main(int argc, char **argv)
 	}
 
 	/* Load our deptree */
-	if ((deptree = _rc_deptree_load(&regen)) == NULL)
+	if ((deptree = _rc_deptree_load(0, &regen)) == NULL)
 		eerrorx("failed to load deptree");
+	if (exists(RC_DEPTREE_SKEWED))
+		ewarn("WARNING: clock skew detected!");
 
 	/* Clean the failed services state dir */
 	clean_failed();

src/rc/runscript.c

@@ -4,7 +4,7 @@
  */
 
 /*
- * Copyright 2007-2008 Roy Marples <roy@marples.name>
+ * Copyright 2007-2009 Roy Marples <roy@marples.name>
  * All rights reserved
 
  * Redistribution and use in source and binary forms, with or without
@@ -748,7 +748,7 @@ svc_start(bool deps)
 		depoptions |= RC_DEP_STRICT;
 
 	if (deps) {
-		if (!deptree && ((deptree = _rc_deptree_load(NULL)) == NULL))
+		if (!deptree && ((deptree = _rc_deptree_load(0, NULL)) == NULL))
 			eerrorx("failed to load deptree");
 		if (!types_b)
 			setup_types();
@@ -977,7 +977,7 @@ svc_stop(bool deps)
 		if (rc_conf_yesno("rc_depend_strict") || errno == ENOENT)
 			depoptions |= RC_DEP_STRICT;
 
-		if (!deptree && ((deptree = _rc_deptree_load(NULL)) == NULL))
+		if (!deptree && ((deptree = _rc_deptree_load(0, NULL)) == NULL))
 			eerrorx("failed to load deptree");
 
 		if (!types_m)
@@ -1368,7 +1368,7 @@ runscript(int argc, char **argv)
 				depoptions |= RC_DEP_STRICT;
 
 			if (!deptree &&
-			    ((deptree = _rc_deptree_load(NULL)) == NULL))
+			    ((deptree = _rc_deptree_load(0, NULL)) == NULL))
 				eerrorx("failed to load deptree");
 
 			tmplist = rc_stringlist_new();