From 0f7891a57138fa33aa15e6617d224266f94495e1 Mon Sep 17 00:00:00 2001
From: Dirk von Suchodoletz
Date: Tue, 10 Mar 2009 16:11:41 +0000
Subject: Changing the default behaviour of unionfs/aufs usage:   * use
 aufs/unionfs (in this order) if available   * disable the functionality via
 kernel cmdline with noaufs/nounionfs

git-svn-id: http://svn.openslx.org/svn/openslx/openslx/trunk@2707 95ad53e4-c205-0410-b2fa-d234c58c8868
---
 initramfs/stage3-stuff/init | 48 +++++++++++++++++++--------------------------
 1 file changed, 20 insertions(+), 28 deletions(-)

(limited to 'initramfs/stage3-stuff/init')

diff --git a/initramfs/stage3-stuff/init b/initramfs/stage3-stuff/init
index d7866ead..81b4d155 100755
--- a/initramfs/stage3-stuff/init
+++ b/initramfs/stage3-stuff/init
@@ -96,6 +96,8 @@ tmpfssize="$(expr $(grep -i "memtotal" /proc/meminfo | awk '{print $2}') \
 cowsize="50%"
 rwdir=/dev/shm
 nfsro="nfs"
+aufs=1
+unionfs=1
 
 runinithook '00-started'
 
@@ -198,8 +200,8 @@ in $0\ncountry=\"${COUNTRY}\"" >>/etc/initramfs-setup
     ldsc)
       ldsc="yes";;
     # simple union of base ro rootdir with tempfs on top
-    unionfs)
-      unionfs=1;;
+    nounionfs)
+      unionfs=0;;
     # additional source to unify root filesystem with; the top layer will be
     # the tempfs
     unionfs=*)
@@ -209,8 +211,8 @@ in $0\ncountry=\"${COUNTRY}\"" >>/etc/initramfs-setup
       ldsc="yes"
     ;;
     # same for AUFS; alternative to unionfs
-    aufs)
-      aufs=1;;
+    noaufs)
+      aufs=0;;
     aufs=*)
       aufs=1
       uniondirs=${opts#aufs=}
@@ -660,8 +662,7 @@ fi
 runinithook '35-have-network-root'
 
 # get the complete collection of kernel modules available
-mount -n --bind /mnt/lib/modules/${KERNEL} /lib/modules/${KERNEL} || \
-  error "$init_moddir"
+mount -n --bind /mnt/lib/modules /lib/modules || error "$init_moddir"
 # start hardware configuration as background process if not a special
 # debuglevel (21) is used for the option of manual hwautocfg start
 if [ ${DEBUGLEVEL} = 21 ] ; then
@@ -676,29 +677,20 @@ fi
 runinithook '40-started-hw-config'
 
 union_type=""
-# try to use unionfs for rw access if available
-if [ -n "${unionfs}" ]; then
-  modprobe ${MODPRV} unionfs  && union_type="UnionFS"
-  if [ -z "$union_type" ]; then
-    error "$init_loadufs" nonfatal
-    unset unionfs
-    # if unionfs is not available, check for aufs and inform user
-    modprobe ${MODPRV} -n aufs && error $init_noufs_butaufs
-  fi
-fi
 # try to use aufs for rw access if available
-if [ -n "${aufs}" ]; then
-  modprobe ${MODPRV} aufs   && union_type="AUFS"
-  if [ -z "$union_type" ]; then
-    error "$init_loadaufs" nonfatal
-    unset aufs
-    # if aufs is not available, check for unionfs and inform user
-    modprobe ${MODPRV} -n unionfs && error $init_noaufs_butufs
-  fi
+if [ ${aufs} -eq 1 ] && \
+   modprobe ${MODPRV} aufs 2>/dev/null && \
+   lsmod | grep -qe "^aufs" ; then union_type="AUFS"
+elif [ ${unionfs} -eq 1 ] && \
+     modprobe ${MODPRV} unionfs 2>/dev/null && \
+     lsmod | grep -qe "^unionfs" ; then union_type="UnionFS"
+else
+  error "$init_loadaufs" nonfatal
+  unset aufs unionfs
 fi
 
 # setup of client root filesystem dependent on the availability of UnionFS
-if [ -n "${unionfs}" -o -n "${aufs}" ] ; then
+if [ -n "${union_type}" ] ; then
   echo "Using ${union_type} for rw access"
   mkdir -p ${rwdir}/union ${rwdir}/uniontmp /rorootfs
   mount -n -t tmpfs none ${rwdir}/uniontmp
@@ -815,7 +807,7 @@ if [ -n "${ldsc}" ] ; then
     error "$init_errldcfg"
   fi
 else
-  error "$init_infldcfg" nonfatal
+  [ $DEBUGLEVEL -gt 2 ] && error "$init_infldcfg" nonfatal
 fi
 
 runinithook '60-have-servconfig'
@@ -905,7 +897,7 @@ runinithook '90-postinit-done'
 # unmount the bind mounted modules directory and nfs /tmp/scratch (if present)
 export ticks
 for ticks in 0 1 2 5 10 20 30; do
-  sleep $ticks && umount -n /lib/modules/${KERNEL} 2>/dev/null && break
+  sleep $ticks && umount -n /lib/modules 2>/dev/null && break
   error "$init_wait" nonfatal
 done
 mount 2>/dev/null | grep -q "/tmp/scratch type nfs" && \
@@ -913,7 +905,7 @@ mount 2>/dev/null | grep -q "/tmp/scratch type nfs" && \
     sleep $ticks && umount -n /tmp/scratch 2>/dev/null && break
   done
 
-mount 2>/dev/null | grep -q /lib/modules/${KERNEL} && error "$init_errumnt"
+mount 2>/dev/null | grep -q /lib/modules && error "$init_errumnt"
 # check for inittab file (might fail for new style init -> upstart)
 test -f /mnt/etc/inittab || test -d /mnt/etc/event.d || error "$init_erritab"
 # close runlevel script for stuff to execute during early bootup
-- 
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