## 101212.xen4_update_vm
## - was: 100804.xen4_update_vm080304.xenu_update_mod
## - migrate para-VM to xen-4
##   - fix xen4:
##     ca02          131073 xvda2 driver: vbd
##     Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
##     - details: 100802.prob.xen-4.vfs_unable_mount_xvda_vbd
##   - copy linux-XenU-modules into VM-Image (offline)
##     procedure: extract version from vm.cfg -> mount fs -> copy modules 
##   - create devices (ex. hvc,xvda)
## - notes
##   - xen4 use 3 different names for the same object (confused). sample:
##     vmcfg:root = "ca01 ro"
##     vmcfg:disk = ...,sda1,w'
##     vm:fstab:/dev/xvda1  /  ext3...
## - usage: copy&paste line by line, check variables before use
##   optional: check config with xm_sh_tech 
## - contact: hlehmann_at_fh-lausitz.de
#### ---------------------------------------------------------------------
#### CHANGES
## 101212
## - fix oldhd
## - debug
## 100804
## - add check xvda (100802.prob.xen-4.vfs_unable_mount_xvda_vbd)
## - add support lvol
## - add check hvc
#### ---------------------------------------------------------------------
#### var
CFG=vm1			## vm.cfg      <-- change it
etcxencfg=/etc/xen/$CFG
chkdevxvda=1		## 1: mknod xvdaX (update to pvops)
maxdevxvd=4		## n: mknod xvda4 (depend chkdevxvda=1)
chkfstabxvd=1		## 1: convert fstab sda -> xvda
mnt=/mnt/tmp		## temp mountpoint
LOG=$HOME/xenu_update_mod.log
chkkernel=1		## 1: replace $imgxenu in vm.cfg
imgxenu=/boot/vmlinux-2.6.32 	## new imgxenu
imgxenu=`ls -tr /boot/vmli*xenU | tail -1` ## new imgxenu
chkhvc=1		## 1: check: xencons securetty /dev/hvc0 inittab
chkca=1			## 1: convert root=/dev/sda1  -> root=ca01

#### sh env
echo "CFG=$CFG mnt=$mnt imgxenu=$imgxenu"
[ ! -d $mnt ] && echo "Error: dir $mnt not exist"
[ `mount | egrep "$mnt " | wc -l` -eq 1 ] && echo "Error: mnt $mnt busy"
[ $chkkernel -eq 1 -a ! -f $imgxenu ] && echo "Error: file $imgxenu not exist"
[ ! -f $etcxencfg ] && echo "Error: file $etcxencfg not exist"
ls -l $etcxencfg*

[ -f $LOG ] && grep $CFG $LOG
echo "`date +%y%m%d` update_mod CFG=$CFG chkdevxvda=$chkdevxvda \
 chkfstabxvd=$chkfstabxvd chkhvc=$chkhvc" | tee -a $LOG

#### check VERxenU
#VERxenU=`uname -r | sed "s/-xen.*//"`-xenU
#echo "VERxenU=$VERxenU"		## unused

### read cfg
kimg=`cat $etcxencfg | grep "^kern" | cut -d = -f 2 | sed "s/\"//g;s/ //g"`
#kver=`echo $kimg | sed "s:\"::g;s:^.*vmlinuz-\(.*\)$:\1:"`
echo "kimg=$kimg"
#if [ "$VERxenU" != "$kver" ]; then echo Version xenU differ. using $kver;
# VERxenU=$kver; fi
vmname=`cat $etcxencfg | grep "^name" | cut -d = -f 2 | sed "s/\"//g;s/ //g"`
[ ! -f $kimg ] && echo "Warning: configured image $kimg not found"
echo "CFG=$CFG vmname=$vmname kimg=$kimg"

#### read VM-Image
## root-fs defined at 1. line typical
#imgroot=`cat $etcxencfg | grep "^disk" |sed "s/,/:/" | cut -d : -f 2 | head -1`
imgroot=`cat $etcxencfg | grep "^disk" |cut -d , -f 1 |sed "s:.*\:::"|head -1`
ls -la $imgroot*
[ ! -f "$imgroot" -a ! -e "$imgroot" ] && echo "Error: root-fs  $imgroot not found"

#### read ModVer
#VERmod=`zcat $kimg | strings | grep ^2.6 | head -1 | awk '{ print $1}'`
#[ "$VERmod" = "" ] && VERmod=`cat $kimg | strings | grep ^2.6 | head -1 \
# | awk '{ print $1}'`
#echo "VERmod=$VERmod"

#### list avaible modules
#ls -la /lib/modules/ | grep $VERmod
#[ ! -d "/lib/modules/$VERmod" ] && echo "ERROR: Dir /lib/modules/$VERmod not exist"

#### ---------------------------------------------------------------------
#### chkkernel
grep kernel $etcxencfg
echo "check $kimg -> $imgxenu"
if [ $chkkernel -eq 1 ]; then
 if [ `grep "$imgxenu" $etcxencfg | wc -l` -eq 1 ]; then
 echo "nothing to do"
 else
  echo "change $kimg -> $imgxenu"
  cp -p $etcxencfg $etcxencfg.old
  cat $etcxencfg.old | sed "s%$kimg%$imgxenu%" > $etcxencfg
  diff $etcxencfg.old $etcxencfg
 fi
fi

#### reread cfg
kimg=`cat $etcxencfg | grep "^kern" | cut -d = -f 2 | sed "s/\"//g;s/ //g"`
echo "kimg=$kimg"
[ ! -f $kimg ] && echo "ERROR: Image $kimg not found"

#### read ModVer
VERmod=`zcat $kimg | strings | grep ^2.6 | head -1 | awk '{ print $1}'`
[ "$VERmod" = "" ] && VERmod=`cat $kimg | strings | grep ^2.6 | head -1 \
 | awk '{ print $1}'`
echo "VERmod=$VERmod"
[ ! -d "/lib/modules/$VERmod" ] && echo "ERROR: Dir /lib/modules/$VERmod not exist"

#### xen0: compile xenU modules
# xen-2.x: linux-$VERlin-xenU# make ARCH=xen modules modules_install
# xen-3.x: build*$VERlin*xenU# make modules modules_install

#### Shutdown VM
xm list $vmname
xm shut $vmname
sleep 30

#### mount VM-Image
[ -f $imgroot ] && mount -o loop $imgroot $mnt
[ ! -f $imgroot -a -e $imgroot ] && mount $imgroot $mnt
#devm=/dev/mapper
#[ ! -f $devm/$imgroot -a -e $devm/$imgroot ] && mount $devm/$imgroot $mnt

#### list installed modules
ls -l  /lib/modules/ | grep $VERmod
ls -l  $mnt/lib/modules/ | grep $VERmod
du -sk $mnt/lib/modules/*
  
#### copy files
# rm -fR $mnt/lib/modules/$VERmod
dir=$mnt/lib/modules/$VERmod; [ -d $dir -a "$VERmod" != "" ] && mv $dir $dir.old
# mkdir $mnt/lib/modules/$VERmod
[ "$VERmod" != "" ] && echo "exec: cp -a /lib/modules/$VERmod $mnt/lib/modules/"
[ "$VERmod" != "" ] && cp -a /lib/modules/$VERmod $mnt/lib/modules/
du -sk  $mnt/lib/modules/*
ls -la $mnt/lib/modules

#### chkdevxvda (xen-4)
if [ $chkdevxvda -eq 1 -a ! -e $mnt/dev/xvda ]; then
 mknod -m 600 $mnt/dev/xvda b 202 0; chown root:disk $mnt/dev/xvda
for i in $(seq 1 $maxdevxvd) ;do
 mknod -m 600 $mnt/dev/xvda$i b 202 $i; chown root:disk $mnt/dev/xvda$i
 ls -la $mnt/dev/xvda$i
done
else
 echo "/dev/xvda already exist, nothing to do"
fi
# ls -l $mnt/dev/xvda*

#### chkfstab (xen-4)
if [ $chkfstabxvd -eq 1 ]; then
 file=$mnt/etc/fstab
 # cat $file
 if [ `grep xvda $file| wc -l` -eq 0 ]; then
  old=hda; [ `grep sda $file| wc -l` -ne 0 ] && old=sda
  echo update $file $old xvda
  mv $file $file.old
  cat $file.old | sed "s:$old:xvda:g" > $file
  diff $file.old $file
  # chkca=1   ## recommended
 else
  echo "xvda found in $file, nothing to do"
 fi
 ls -l $file*
fi

file=$etcxencfg
# grep root $file 
if [ $chkca -eq 1 -a $chkfstabxvd -eq 1 ]; then
 if [ `grep root $file | grep ca0| wc -l` -eq 0 ]; then
  old=hda; [ `grep sda $file| wc -l` -ne 0 ] && old=sda
  echo "chg $old -> ca0"
  cp -p $file $file.old
  #cat $file.old | sed "s:$old:ca0:g" > $file
  cat $file.old | sed "s:\(^root.*\)/dev/$old\(.*$\):\1ca0\2:g" > $file
  diff $file.old $file
 else
   echo "ca0 found in $file, nothing to do"
 fi
fi ## if chkca


## inittab getty
# http://www.archivum.info/ubuntu-bugs@lists.ubuntu.com/2010-05/00402/(Bug-572708)-(NEW)-upstart-disables-hvc0-getty-in-Lucid-10.04.html
# http://www.mjmwired.net/kernel/Documentation/powerpc/hvcs.txt
##-d $mnt/etc/init
if [ $chkhvc -eq 1 -a -d $mnt/etc/init ]; then
 file=$mnt/etc/init/hvc0.conf
 if [ ! -f $file ]; then
  echo "create $file"
  cat > $file<<EOF  
# hvc0.conf create by 100804.xen4_update_vm
  start on stopped rc RUNLEVEL=[2345]
  stop on runlevel [!2345]
  respawn
  exec /sbin/getty -8 38400 hvc0
EOF
 else
  echo "nothing to do"
 fi
fi ##-d $mnt/etc/init  

if [ $chkhvc -eq 1 -a ! -d $mnt/etc/init ]; then ## inittab
 file=$mnt/etc/inittab
 if [ `grep hvc0 $file| wc -l` -eq 0 ]; then
   cp -p $file $file.old
   echo "update $file hvc0"
   bingetty=/sbin/agetty
   [ -f "$mnt/sbin/getty" ] && bingetty=/sbin/getty
   echo "c1:12345:respawn:$bingetty -L 38400 hvc0 linux" >> $file
   diff $file.old $file
 else
  echo "entry hvc0 found in $file, nothing to do"
 fi
fi ## !-d $mnt/etc/init

## /dev/hvc0
if [ $chkhvc -eq 1 ]; then
 if [ ! -e $mnt/dev/hvc0 ]; then
  echo "mknod $mnt/dev/hvc0 c 229 0"
  mknod $mnt/dev/hvc0 c 229 0
 else 
  echo "/dev/hvc0 already exist"
 fi
 ls -l $mnt/dev/hvc*
fi ## if chkhvc

## securetty
if [ $chkhvc -eq 1 ]; then
 file=$mnt/etc/securetty
 if [ `grep hvc0 $file| wc -l` -eq 0 ]; then
  echo "add hvc0 $file"
  cp -p $file $file.old
  echo "hvc0" >> $file
 else
  echo "entry hvc0 already exist in $file, nothing to do"
 fi
 ls -l $file*
fi ## if chkhvc

## xencons
file=$etcxencfg
if [ $chkhvc -eq 1 ]; then
 if [ `grep xencons $file| wc -l` -eq 0 ]; then
 echo "add extra=\"xencons=tty\""
 cp -p $file $file.old
 echo "extra=\"xencons=tty\"" >> $file
 diff $file.old $file
 else
   echo "xencons found in $file, nothing to do"
 fi
fi ## if chkhvc

## show vm.cfg
[ `grep -v "^#" $etcxencfg | grep xenbr | wc -l` -ne 0 ] \
 && echo "Warn: uihhh...asbach, check bridge: brctl show (chg. not impl. yet)"
[ `grep -v "^#" $etcxencfg | grep ramdisk | wc -l` -ne 0 ] \
 && echo "Warn: ramdisk found (chg. not impl. yet)"

grep -v "^#" $etcxencfg

#### umount VM-Image
umount  $mnt

#### ---------------------------------------------------------------------
#### start VM
# xm create $CFG
# xm list
xm create $CFG -c