https://bugzilla.redhat.com/show_bug.cgi?id=433702

Changes to init scripts to better support stateless:

--rc.sysinit--

 - don't update mtab in a r/o root
 - mount on sys and /dev/pts returns EBUSY on a readonly root
 - [ -n $CLIENTSTATE ] is always returning true, causing an unnecessary timeout

--network--

 - /etc/mtab may not have any mount information in the readonly-root
   cause, but the root mount is likely to be a network mount.  Without
   this, nfs hangs the reboot process.

--halt--

 - don't try and update a read-only mtab

--rwtab--

 - /var/empty/sshd/etc/localtime needs to be overwritten by sshd at
   startup
 - /var/lib/random-seed is written to at shutdown; this fixes the
   error but doesn't return the functionality lost in a r/o /var/lib.

4 files changed, 27 insertions, 16 deletions

diff --git a/rc.d/init.d/halt b/rc.d/init.d/halt
index 2e5d8150..3242491a 100755
--- a/rc.d/init.d/halt
+++ b/rc.d/init.d/halt
@@ -11,6 +11,9 @@
 NOLOCALE=1
 . /etc/init.d/functions
 
+UMOUNT="umount"
+[ ! -w /etc ] && UMOUNT="umount -n"
+
 action() {
    echo -n "$1 "
    shift
@@ -131,7 +134,7 @@ esac
 # Try to unmount tmpfs filesystems to avoid swapping them in.  Ignore failures.
 tmpfs=$(awk '$2 ~ /^\/($|proc|dev)/ { next; }
 	     $3 == "tmpfs" { print $2; }' /proc/mounts | sort -r)
-[ -n "$tmpfs" ] && fstab-decode umount $tmpfs 2>/dev/null
+[ -n "$tmpfs" ] && fstab-decode $UMOUNT $tmpfs 2>/dev/null
 
 # Turn off swap, then unmount file systems.
 [ -f /proc/swaps ] && SWAPS=`awk '! /^Filename/ { print $1 }' /proc/swaps`
@@ -170,7 +173,7 @@ LANG=C __umount_loop '$2 ~ /^\/$|^\/proc|^\/dev/{next}
 	$"Unmounting file systems (retry): " \
 	-f
 
-[ -f /proc/bus/usb/devices ] && umount /proc/bus/usb
+[ -f /proc/bus/usb/devices ] && $UMOUNT /proc/bus/usb
 
 [ -f /etc/crypttab ] && \
     LANG=C action $"Stopping disk encryption: " halt_crypto
@@ -183,7 +186,7 @@ rm -f /.autofsck
 awk '$2 !~ /\/(|dev|proc|selinux)$/ && $1 !~ /^\/dev\/ram/ { print $2 }' \
     /proc/mounts | sort -r | \
   while read line; do
-    fstab-decode umount -f $line
+    fstab-decode $UMOUNT -f $line
 done
 
 if [ -x /sbin/halt.local ]; then
diff --git a/rc.d/init.d/network b/rc.d/init.d/network
index 9efb67bc..e209b3a8 100755
--- a/rc.d/init.d/network
+++ b/rc.d/init.d/network
@@ -171,7 +171,7 @@ case "$1" in
   stop)
   	# Don't shut the network down if root is on NFS or a network
 	# block device.
-        rootfs=$(awk '{ if ($1 !~ /^[ \t]*#/ && $2 == "/") { print $3; }}' /etc/mtab)
+        rootfs=$(awk '{ if ($1 !~ /^[ \t]*#/ && $2 == "/" && $3 != "rootfs") { print $3; }}' /proc/mounts)
         rootopts=$(awk '{ if ($1 !~ /^[ \t]*#/ && $2 == "/") { print $4; }}' /etc/mtab)
 	
 	if [[ "$rootfs" =~ "^nfs" ]] || [[ "$rootopts" =~ "_netdev|_rnetdev" ]] ; then
diff --git a/rc.d/rc.sysinit b/rc.d/rc.sysinit
index ea9c6884..7f28783b 100755
--- a/rc.d/rc.sysinit
+++ b/rc.d/rc.sysinit
@@ -595,7 +595,7 @@ if [ "$READONLY" = "yes" -o "$TEMPORARY_STATE" = "yes" ]; then
 		/bin/true
 	elif [ x$state_mount_dev != x ] && mount $state_mount_dev $mountopts "$STATE_MOUNT" > /dev/null 2>&1;  then
 		/bin/true
-	elif [ -n "$CLIENTSTATE" ]; then
+	elif [ ! -z "$CLIENTSTATE" ]; then
 		# No local storage was found.  Make a final attempt to find 
 		# state on an NFS server.
 
@@ -730,23 +730,29 @@ if [ -n "$SELINUX_STATE" ]; then
    restorecon /etc/mtab /etc/ld.so.cache /etc/blkid/blkid.tab /etc/resolv.conf >/dev/null 2>&1
 fi
 
-# Clear mtab
-(> /etc/mtab) &> /dev/null
+if [ "$READONLY" != "yes" ] ; then
+	# Clear mtab
+	(> /etc/mtab) &> /dev/null
 
-# Remove stale backups
-rm -f /etc/mtab~ /etc/mtab~~
+	# Remove stale backups
+	rm -f /etc/mtab~ /etc/mtab~~
 
-# Enter mounted filesystems into /etc/mtab
-mount -f /
-mount -f /proc >/dev/null 2>&1
-mount -f /sys >/dev/null 2>&1
-mount -f /dev/pts >/dev/null 2>&1
-mount -f /proc/bus/usb >/dev/null 2>&1
+	# Enter mounted filesystems into /etc/mtab
+	mount -f /
+	mount -f /proc >/dev/null 2>&1
+	mount -f /sys >/dev/null 2>&1
+	mount -f /dev/pts >/dev/null 2>&1
+	mount -f /proc/bus/usb >/dev/null 2>&1
+fi
 
 # Mount all other filesystems (except for NFS and /proc, which is already
 # mounted). Contrary to standard usage,
 # filesystems are NOT unmounted in single user mode.
-action $"Mounting local filesystems: " mount -a -t nonfs,nfs4,smbfs,ncpfs,cifs,gfs -O no_netdev
+if [ "$READONLY" != "yes" ] ; then
+	action $"Mounting local filesystems: " mount -a -t nonfs,nfs4,smbfs,ncpfs,cifs,gfs -O no_netdev
+else
+	action $"Mounting local filesystems: " mount -a -n -t nfs4,smbfs,ncpfs,cifs,gfs -O no_netdev
+fi
 
 if [ -x /sbin/quotaon ]; then
     action $"Enabling local filesystem quotas: " /sbin/quotaon -aug
diff --git a/rwtab b/rwtab
index e01e7655..605b2bcd 100644
--- a/rwtab
+++ b/rwtab
@@ -33,3 +33,5 @@ files	/var/lib/iscsi
 files	/var/lib/logrotate.status
 files	/var/lib/ntp
 files	/var/lib/xen
+files	/var/empty/sshd/etc/localtime
+files	/var/lib/random-seed