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#!/bin/bash

# -------------------------------------------------------------------------- #
# Copyright 2010, K.Q. Infotech Pvt. Ltd. #
# #
# Licensed under Open-source License ; you may not use this file except in #
# compliance with the License. You may obtain a copy of the License as part #
# of the software distribution. #
# Unless agreed to in writing, software distributed under the #
# License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES #
# OR CONDITIONS OF ANY KIND, either express or implied. See the #
# License for the specific language governing permissions and #
# limitations under the License. #
#--------------------------------------------------------------------------- #


# zfs source dir
HOME_DIR=`pwd`

# pre-execution dir
PREV_DIR=`pwd`

# zfs to be compiled with
KERNEL_VERSION=`uname -r`

# spl zfs lzfs configuration params
CONFIG_PARAM=''
 
# message colors
txtred='\e[0;31m' # err
txtgrn='\e[0;32m' # echo
txtrst='\e[0m' # reset


function capture_spin {
trap "stop_spin" SIGINT SIGTERM
}

function stdin_stdout_to_log {
exec 6>&1
exec &> $LOG
}

# show spinnig bar during installation
function start_spin {
(while true
do
echo -en '/\010' ; sleep .1
echo -en '-\010' ; sleep .1
echo -en '\\\010' ; sleep .1
echo -en '|\010' ; sleep .1
done) &
SPIN_PID=$!
}

# stop spinnig bar
function stop_spin {
kill $SPIN_PID
    # cd pre-execution dir
    cd $PREV_DIR
echo ' '
}

function exits {
   stop_spin
   exit $1
}

# CONFIGURATION
function Message {
echo -e "################################################"
echo -e $*
echo -e "################################################"
}

function select_deployment {
msg "Select deployment type (press '0' to exit):"
msg "1) ZFS on Ubuntu 10.04"
msg "2) ZFS on Ubuntu 10.10"
msg "3) ZFS on Fedora 13"
msg "4) ZFS on Fedora 14"
msg "5) ZFS on Redhat 6"
msg "6) ZFS on Gentoo"
read DEPLOYMENT

case $DEPLOYMENT in
1)
            # start ops
;;
2)
            # start ops
;;
3)
            # start ops
;;
4)
            # start ops
;;
  5)
            # start ops
;;
  6)
            # start ops
;;
 
 
*)
exits 1
;;
esac
msg ""
}

function ask_configuration {
msg "You have selected an XXX deployment. Do you want automatic configuration"
echo -n "(y/n) " >&6
read OPT
case $OPT in
y*|Y*)
OPT='yes'
;;
*) OPT='no'
;;
esac
msg ""
if [ "$OPT" = 'yes' ]; then
msg "input YYY"
read IP
fi
msg ""
}

function install_Ubuntu_pkg {
   # check for package availability
   if dpkg -s $1 ; then
echo -e "${txtgrn}package available: " $1 "${txtrst}"
   else
echo -e "${txtgrn}going to install $1 tool...${txtrst}"
        if apt-get install $1
         then
echo -e "${txtgrn}$1 installed successfully${txtrst}"
         else
Message "${txtred}failure. Try $1 manual installation${txtrst}"
          exits 1
         fi
fi
}
 
function install_Fedora_pkg {
   # check for package availability
   if yum list installed $1 ; then
echo -e "${txtgrn}package available: " $1 "${txtrst}"
   else
echo -e "${txtgrn}going to install $1...${txtrst}"
        if yum install $1
         then
echo -e "${txtgrn}$1 installed successfully${txtrst}"
         else
Message "${txtred}failure. Try $1 manual installation${txtrst}"
          exits 1
         fi
fi
}
function install_Ubuntu_dependencies {
     DEP_LIST="gawk zlib1g-dev uuid-dev linux-headers-`uname -r`"
     for pkg in $DEP_LIST
     do
install_Ubuntu_pkg $pkg
     done
}

function install_Fedora_dependencies {
     DEP_LIST="gcc kernel-devel-`uname -r` zlib-devel libuuid-devel"
     for pkg in $DEP_LIST
     do
install_Fedora_pkg $pkg
     done
}


 
function resolve_dependencies {
       for OS in `cat /etc/issue` ; do echo -e "${txtgrn}Operating system: " $OS `uname -r` ${txtrst} ; break ; done
case $OS in
        'Fedora')
             install_Fedora_dependencies
         ;;
        'Ubuntu')
             install_Ubuntu_dependencies
         ;;
        'Red')
             # assume red hat dependencies same as fedora
             install_Fedora_dependencies
         ;;
       *)
        Message "${txtred}failure. unexpected distro found. Resolve dependencies manually.${txtrst}"
         ;;
     esac
 
}

function startups {
       for OS in `cat /etc/issue` ; do echo -e "${txtgrn}Operating system: " $OS `uname -r` ${txtrst} ; break ; done
case $OS in
        'Fedora')
             if cp $HOME_DIR/lzfs/etc/init.d/initd.redhat /etc/init.d/zfsload ; then
echo -e "${txtgrn}${txtrst}"
             else
echo -e "${txtred}can not copy init file ${txtrst}"
             fi
if chkconfig --add zfsload ; then
echo -e "${txtgrn}init script applied successfully${txtrst}"
             else
echo -e "${txtred}init script initialization error ${txtrst}"
             fi
         ;;
        'Ubuntu')
             if cp $HOME_DIR/lzfs/etc/init.d/initd.debian /etc/init.d/zfsload ; then
echo -e "${txtgrn}${txtrst}"
             else
echo -e "${txtred}can not copy init file ${txtrst}"
             fi
if update-rc.d zfsload defaults ; then
echo -e "${txtgrn}init script applied successfully${txtrst}"
             else
echo -e "${txtred}init script initialization error ${txtrst}"
             fi
         ;;
       *)
        Message "failure. unexpected distro found. Resolve dependencies manually."
         ;;
     esac
 
}

function make_configure {
  if cd $HOME_DIR/$1 ; then
echo -e "${txtgrn}configure $1 ${txtrst}"
      if ./configure $CONFIG_PARAM ; then
echo -e "${txtgrn}lzfs configured successfully : ${txtrst}"
      else
Message "${txtred}lzfs Configure error ${txtrst}"
          exits 1
      fi
if make ; then
echo -e "${txtgrn}lzfs make successful : ${txtrst}"
      else
Message "${txtred}lzfs Make error ${txtrst}"
          exits 1
      fi
else
Message "${txtred}can not cd to $HOME_DIR/zfs ${txtrst}"
  fi
}

function load_zfs_modules_stack {
  if cd $HOME_DIR/$1 ; then
echo -e "${txtgrn}loading zfs module stack ${txtrst}"
      if ./zfs.sh -v ; then
echo -e "${txtgrn}zfs module stack loaded successfully : ${txtrst}"
      else
echo -e "${txtred}error while loading zfs module stack ${txtrst}"
      fi
else
Message "${txtred}can not cd to $HOME_DIR/zfs ${txtrst}"
  fi
}

function insert_lzfs {
  if insmod $HOME_DIR/$1 ; then
echo -e "${txtgrn}insmod lzfs successful${txtrst}"
  else
echo -e "${txtred}insmod lzfs failure${txtrst}"
  fi
}

function make_install {
# make install
  if cd $HOME_DIR/$1 ; then
echo -e "${txtgrn}starting $1 make install ${txtrst}"
      if make install ; then
echo -e "${txtgrn}$1 make install successful : ${txtrst}"
      else
Message "${txtred}$1 make install error ${txtrst}"
          exits 1
      fi
else
Message "${txtred}can not cd to $HOME_DIR/zfs ${txtrst}"
  fi
}

function main {
    # check for superuser permissions
    capture_spin
    start_spin
 
    echo -e "${txtgrn}starting zfs installation : ${txtrst}"
    echo -e "${txtgrn}HOME_DIR : $HOME_DIR ${txtrst}"
    echo -e "${txtgrn}KERNEK_VERSION : $KERNEL_VERSION ${txtrst}"
           
    #check for super user permission
    [ $UID -ne 0 ] && Message "${txtred}Error : Superuser previllages required${txtrst}" && exits
    echo -e "${txtgrn}super user previllages available... ${txtrst}";

    # if args are not provided then get pwd as HOME_DIR
    [ $# -gt 0 ] && HOME_DIR=$1

    cd $HOME_DIR || ( Message "${txtred}can not cd to repo home ${txtrst}" && exits )
    echo -e "${txtgrn} cd to repo home done ... ${txtrst}";

    # pull source repositories if not available
    pullRepos

    # check if zfs module allready loaded
    lsmod | grep zfs ;
    [ $? -eq 0 ] && Message "${txtred}remove zfs module first to proceed ${txtrst}" && exits

    # check for linux distro / version and resolve dependencies accordingly
    resolve_dependencies

    # configure and make spl
    CONFIG_PARAM="--with-linux=/lib/modules/$KERNEL_VERSION/build"
    make_configure spl
 
    # configure and make zfs
    CONFIG_PARAM=$CONFIG_PARAM" --with-spl=$HOME_DIR/spl/"
    make_configure zfs
 
    # configure and make lzfs
    CONFIG_PARAM=$CONFIG_PARAM" --with-zfs=$HOME_DIR/zfs/"
    make_configure lzfs
 
    load_zfs_modules_stack "zfs/scripts/"
    insert_lzfs "lzfs/module/lzfs.ko"
    make_install spl
    make_install zfs
    make_install lzfs

    # ldpath
    export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib
    ldconfig
    # add startup routine ( init scripts )
    startups
    stop_spin
    Message "${txtgrn}zfs installation done ${txtrst}"
    sleep 2
}

# pull source repositories if not available
function pullRepos {
       # check spl dir
       [ -a ./spl ] || ( echo "pulling zfs spl repo.." ; git clone https://github.com/zfs-linux/spl.git || ( echo "${txtred} spl pull failed ... ${txtrst}"; exits ))
       echo -e "${txtgrn} spl available ... ${txtrst}";

       # check zfs dir
       [ -a ./zfs ] || ( echo "pulling zfs spl repo.." ; git clone https://github.com/zfs-linux/zfs.git || ( echo "${txtred} zfs pull failed ... ${txtrst}"; exits ))
       echo -e "${txtgrn} zfs available ... ${txtrst}";

       # check spl dir
       [ -a ./lzfs ] || ( echo "pulling lzfs spl repo.." ; git clone https://github.com/zfs-linux/lzfs.git || ( echo "${txtred} lzfs pull failed ... ${txtrst}"; exits ))
       echo -e "${txtgrn} lzfs available ... ${txtrst}";
}



main $*
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