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From: Xin LI <delphij@FreeBSD.org>
Date: Wed, 15 Apr 2015 21:48:07 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r281565 - head/etc/rc.d
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Author: delphij
Date: Wed Apr 15 21:48:06 2015
New Revision: 281565
URL: https://svnweb.freebsd.org/changeset/base/281565

Log:
  Verify if the saved hostid is still the same and update if
  it was changed.
  
  Sponsored by:	iXsystems, Inc.
  Obtained from:	FreeNAS (trueos commit 0abb740)

Modified:
  head/etc/rc.d/hostid_save

Modified: head/etc/rc.d/hostid_save
==============================================================================
--- head/etc/rc.d/hostid_save	Wed Apr 15 21:47:15 2015	(r281564)
+++ head/etc/rc.d/hostid_save	Wed Apr 15 21:48:06 2015	(r281565)
@@ -16,12 +16,19 @@ rcvar="hostid_enable"
 
 hostid_save()
 {
-	if [ ! -r ${hostid_file} ]; then
-		$SYSCTL_N kern.hostuuid > ${hostid_file}
-		if [ $? -ne 0 ]; then
-			warn "could not store hostuuid in ${hostid_file}."
+	current_hostid=`$SYSCTL_N kern.hostuuid`
+
+	if [ -r ${hostid_file} ]; then
+		read saved_hostid < ${hostid_file}
+		if [ ${saved_hostid} = ${current_hostid} ]; then
+			exit 0
 		fi
 	fi
+
+	echo ${current_hostid} > ${hostid_file}
+	if [ $? -ne 0 ]; then
+		warn "could not store hostuuid in ${hostid_file}."
+	fi
 }
 
 load_rc_config $name