#!/usr/bin/env bash
# $Id$

USAGE="Usage : sbmigrate-site [ site name ]"


PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:$PATH
INSTALLERCONFIG="$HOME/.sbgrid_installer"
BACKUPCONFIG="$HOME/.sbgrid_installer_site_migrated"
SITENAME_FILE="/programs/share/sitename"

touch "/programs/share/site_migrate_check" 2>/dev/null
if [ $? != 0 ]; then
  echo "This user cannot write to /programs/share"
  echo "Check that you have permission to write to this"
  echo "SBGrid software installation. Migration cannot "
  echo "continue without write access. "
  exit 1
else
  echo "Write check passed."
fi

if [ ! -e $INSTALLERCONFIG ]; then
  echo "No installation manager configuration found."
  echo "Cannot continue migration. Exiting."
  exit 1
else
  echo "$INSTALLERCONFIG config found."
fi

if [ -f $SITENAME_FILE ]; then
  SITENAME=$(cat $SITENAME_FILE)
  DATABASE="/programs/share/packages-${SITENAME}.db"
  echo "sitename file found."
else
  echo "No site configuration found."
  echo "Cannot continue migration. Exiting."
  exit 1
fi

if [ ! -e "${DATABASE}" ]; then
  echo "No software database found."
  echo "Cannot continue migration. Exiting."
  exit 1
else
  echo "database file found at: $DATABASE"
fi

echo "Required installation files found."
echo "---------------------------------"
echo 

if [ $1 ]; then
  install_sitename=$1
else
  echo "This script will migration your the site configuration"
  echo "for your SBGrid installation. You will be able to"
  echo "confirm your settings before the migration happens. You"
  echo "will need the new site name that was sent ny email."
  echo "This process should be fast and will not impact running jobs."
  echo
  echo "Exit at any time with a CTRL-c."
  echo
  unset install_sitename
  echo "Enter the SBGrid site name:"
  read install_sitename
fi

echo "Does this site name look correct? Y/n"
echo
echo $install_sitename
echo

read confirmation
if [ $confirmation == Y ]; then
  echo "Great. Migrating installation."
else
  echo "No problem, we can start over. No files were changed."
  exit 0
fi

# process old sbgrid_installer
im_oldsite_name=$(grep 'site = ' $INSTALLERCONFIG | awk '{print $3}')
if [ ! -e "$HOME/.sbgrid_old_sitename" ]; then
  echo $im_oldsite_name >$HOME/.sbgrid_old_sitename
fi

# create new .sbgrid_installer file
TMPCONFIG="${INSTALLERCONFIG}.tmp"
if [ -e $TMPCONFIG ]; then
  rm $TMPCONFIG
fi

if [ ! -e $BACKUPCONFIG ]; then
  cp -av $INSTALLERCONFIG $BACKUPCONFIG
else
  echo "backup config found from previous migration"
  echo "Will not overwrite $BACKUPCONFIG"
fi

cp -av $INSTALLERCONFIG $TMPCONFIG

head -n 1 $TMPCONFIG >${INSTALLERCONFIG}
echo "site = $install_sitename" >>${INSTALLERCONFIG}
grep 'user = ' $TMPCONFIG >>${INSTALLERCONFIG}
grep 'key = ' $TMPCONFIG >>${INSTALLERCONFIG}
grep 'target = ' $TMPCONFIG >>${INSTALLERCONFIG}
echo >>${INSTALLERCONFIG}

echo "$install_sitename" >${SITENAME_FILE}
NEWDATABASE="/programs/share/packages-${install_sitename}.db"

if [ ! -e "$DATABASE.backup" ]; then
  cp -av $DATABASE $DATABASE.backup
else
  echo "previously backed-up database exists"
fi

if [ -e $NEWDATABASE ]; then
  echo "previously migrated database exists:"
  echo "$NEWDATABASE"
  echo will be overwritten.
fi

mv -f $DATABASE $NEWDATABASE
if [ $? == 0 ]; then
  echo "database move successful"
  echo "Migration complete!."

else
  echo "error in database move"
fi