#!/bin/sh

# POST-COMMIT HOOK
#
# Arguments:
#   [1] REPOS-PATH   (the path to this repository)
#   [2] REV          (the number of the revision just committed)
#
# Script requires the configuration file quattor-deploy.conf.  This
# can either be in the same location as this script or in /etc.  If
# both exist, the one in the same location as this script is used.
# 
# The REQUIRED configuration is sourced directly, so it should be a 
# list of bourne shell variable definitions.  See:
# https://trac.lal.in2p3.fr/LCGQWG/wiki/Doc/SCDB/Server
# for more information about the parameters. 
#

# Define names for the arguments. 
REPOS="$1"
REV="$2"

# By default the debugging flag is off.  Set to any non-zero
# value to turn debugging on.  This can be done in configuration
# file.
DEBUG=0

# Flag to indicate whether to use sudo instead of ssh for 
# the post-commit compilation of machine profiles.  If
# sudo is used, then the QUATTORSERVER variable is optional.
# For backwards compatibility, the default is to use ssh.
USE_SUDO=0

# Script on Quattor server to deploy new configuration.
DEPLOYSCRIPT=/root/quattor/scripts/build-tag.pl

# User to run the deployment script.
DEPLOYUSER=root

# Default commands and options.  These should be correct for
# a standard linux machine.  They can be redefined in the 
# REQUIRED quattor-deploy.conf file.

MAILER="/bin/mail"
SVNLOOK="/usr/bin/svnlook"

SSH="/usr/bin/ssh"
SSH_OPTIONS="-o PasswordAuthentication=no"

SUDO="/usr/bin/sudo"
SUDO_OPTIONS="-H"

# Default prefix for mail subject in case of error
ERROR_PREFIX='[Quattor-Deploy]'

# The local directory and places to write the log. 
DIR=`dirname $0`
LOG="/tmp/svn-commit-output-$REV.log"

# Source the site configuration file.  This file is REQUIRED
# because some values have no meaningful defaults.
# See https://trac.lal.in2p3.fr/LCGQWG/wiki/Doc/SCDB/Server
# for more information.

ERRORMSG=
POST_COMMIT_CONF=quattor-deploy.conf
if [ -f ${DIR}/${POST_COMMIT_CONF} ]
then
  . ${DIR}/${POST_COMMIT_CONF}
elif [ -f /etc/${POST_COMMIT_CONF} ]
then
  . /etc/${POST_COMMIT_CONF}
else
    ERRORMSG="Error : ${POST_COMMIT_CONF} not found. Aborting deployment"
    ERRORMSG="${ERRORMSG}\nLook at https://trac.lal.in2p3.fr/LCGQWG/wiki/Doc/SCDB/Server for more information"
fi

# By default, use ssh to trigger compilation of machine profiles.
CMD=$SSH
if [ $USE_SUDO -ne 0 ]; then
  CMD=$SUDO
fi

# Basic sanity checks
if [ -z "$ERRORMSG" ]
then
  if [ ! -x "${MAILER}" ]
  then
    ERRORMSG="Configuration error: mailer '${MAILER}' not executable"
  elif [ ! -x "${CMD}" ]
  then
    ERRORMSG="Configuration error: command '${CMD}' not executable"
  elif [ -z "$NOTIFY" ]
  then
    ERRORMSG='Configuration error: $NOTIFY variable undefined'
  elif [ -z "$USE_SUDO" ]
  then
    if [ -z "$QUATTORSRV" ]
    then
      ERRORMSG='Configuration error: $QUATTORSRV variable undefined'
    fi
  fi
fi

# Abort the processing if an error message has been set.
if [ -n "$ERRORMSG" ]
then
  echo $ERRORMSG
  echo $ERRORMSG >> $LOG
  if [ -x "${MAILER}" ]
  then
    # Try to send a mail to root on local system if $NOTIFY undefined...
    if [ -z "$NOTIFY" ]
    then
      NOTIFY=root
    fi
    echo "$ERRORMSG" | $MAILER -s "$ERROR_PREFIX Error deploying configuration tag $REV" $NOTIFY
  fi
  exit 1
fi

# Set the command options and parameters.  Do this AFTER the 
# configuration has been checked.  The default is for ssh.
CMD_OPTIONS=$SSH_OPTIONS ${DEPLOYUSER}@${QUATTORSRV}
if [ $USE_SUDO -ne 0 ]; then
  CMD_OPTIONS=$SUDO_OPTIONS
fi

# Determine if this is an eligible tag. 
MATCH=`$SVNLOOK diff --revision $REV $REPOS | grep -E '.*Copied:[[:space:]]+tags/([[:digit:]/\.\-]+)[[:space:]]+.*trunk.*'`

DEPLOY=$?

echo "MATCH=$MATCH" > $LOG
echo "DEPLOY=$DEPLOY" >> $LOG

if [ $DEPLOY -eq 0 ]; then

  TAG=`echo $MATCH | sed 's%.*Copied:[[:space:]]*tags/\([[:digit:]/\.\-]*\).*trunk.*%\1%'`

  echo "TAG=$TAG" >> $LOG

  FULL_CMD="$CMD ${CMD_OPTIONS} $DEPLOYSCRIPT $TAG"
  echo $FULL_CMD >> $LOG 
  $FULL_CMD 2>&1 >> $LOG

  RC=$?

  STATUS="SUCCESS"
  if [ $RC -ne 0 ]; then
    STATUS="FAILURE"
    cat $LOG | $MAILER -s "$ERROR_PREFIX $STATUS $RC $REPOS $REV" $NOTIFY
  fi

fi

# Clean up the log file unless we're in debug mode.
if [ $DEBUG -eq 0 ]; then
  rm -f $LOG
fi