#!/bin/sh

#----------------------------------------------------------------------------
# Automated build and test for SCST.  Compares SCST build from 24 hours
# ago with the current one.  See the README.txt on how to run it.
#----------------------------------------------------------------------------


#----------------------------------------------------------------------------
# Helper functions
#----------------------------------------------------------------------------

# Returns the revision number of the source files with date $1.
get_svn_revision() {
  svn info -r "{$1}" "${scst_svn_repo}" | sed -n 's/^Revision: //p'
}

runcmd () {
   logfile="$1"
   str="$2"
   shift 2

   # Header in short logfile
   printf "%-30s ..." "$str" >> ${logfile}.short

   # Header and command in verbose logfile
   { printf "%-30s ... " "$str"; echo "$*"; } >> ${logfile}.verbose

   # Run the command
   ("${ABT_EVAL}" "$*") >> ${logfile}.verbose 2>&1
   res=$?

   # Write result to the short logfile
   if [ $res = 0 ]
   then
      echo "done"   >> ${logfile}.short
   else
      echo "failed" >> ${logfile}.short
   fi

   return $res
}

#----------------------------------------------------------------------------
# Startup
#----------------------------------------------------------------------------

scst_svn_repo="https://scst.svn.sourceforge.net/svnroot/scst/trunk"

# Must have exactly one argument
if [ "$#" -ne 1 ] ; then
    echo "usage: $0 <tag>"
    exit 1
fi

# Get args from command line
if [ "${arg0#/}" = "${arg0}" ]; then
  scriptpath=`dirname $PWD/$0`
else
  scriptpath=`dirname $0`
fi
ABT_TOP=`dirname ${scriptpath}`
ABT_MACHINE="$1"

# Get times and date
ABT_START=`date "+%F %H:%M:%S %Z"`

svn_old_date=`date --date=yesterday +%Y-%m-%dT%H:%M:%S`
svn_new_date=`date --date=today     +%Y-%m-%dT%H:%M:%S`

cd $ABT_TOP

# Clean up output files produced by a previous run.
rm -rf diffs diff.short final new.short new.verbose old.short old.verbose
rm -rf sendmail.log unchanged.log

# Setup any relevant environment variables from conf/<tag>.conf.
. conf/$ABT_MACHINE.conf
if [ "${ABT_JOBS}" = "" ]; then
  ABT_JOBS=1
fi
if [ "${ABT_EVAL}" = "" ]; then
  ABT_EVAL="eval"
fi
if [ "${ABT_TMPDIR}" = "" ]; then
  ABT_TMPDIR="/tmp/scst-$$"
fi


#----------------------------------------------------------------------------
# Check out, build, test
#----------------------------------------------------------------------------

svn_old_rev="`get_svn_revision ${svn_old_date}`"
svn_new_rev="`get_svn_revision ${svn_new_date}`"
if [ "${svn_old_rev}" = "${svn_new_rev}" ]; then
  echo "Both {$svn_old_date} and {$svn_new_date} correspond to r${svn_new_rev}"\
       "-- skipping nightly build." >unchanged.log
  exit 0
fi

# Do everything twice -- once for the 24 hours old SCST, and once
# for the current one.
for logfile in old new ; do

   # Remove the old scst directory.
   rm -rf "${ABT_TMPDIR}"
   mkdir -p "${ABT_TMPDIR}/scst"

   # Remove old short and verbose log files, and start the new ones.
   for ext in short verbose ; do
      echo > ${logfile}.$ext
   done

   # Choose the current SCST, or one from 24 hours ago.
   if [ ${logfile} = "old" ] ; then
      svn_date="$svn_old_date"
   else
      svn_date="$svn_new_date"
   fi

   # Check out and run the tests.
   runcmd ${logfile} \
          "Checking out SCST source tree" \
          "svn co -q -r {${svn_date}} ${scst_svn_repo} ${ABT_TMPDIR}/scst" && \
   runcmd ${logfile} \
          "Running regression tests" \
          "cd ${ABT_TMPDIR}/scst && scripts/run-regression-tests -k -d ${ABT_TMPDIR}/regtest -j ${ABT_JOBS} -q ${ABT_KERNELS}"
   runcmd ${logfile} \
          "Cleaning up" \
          "rm -rf ${ABT_TMPDIR}"

   tail -n +4 ${logfile}.verbose >>${logfile}.short

done

#----------------------------------------------------------------------------
# Prepare results and send
#----------------------------------------------------------------------------

# 'final' shows the difference between the old and new results
echo                                                >  final
echo "Nightly build on $ABT_MACHINE ($ABT_DETAILS)" >> final
echo "started at $ABT_START and compared r${svn_old_rev} with r${svn_new_rev}." \
                                                    >> final

# If the results differ from 24 hours ago, print extra stuff.
diff -u old.short new.short > diff.short
changed=$?

if [ $changed != 0 ] ; then
   echo "Results differ from 24 hours ago"      >> final
   changed_str=""
else
   echo "Results unchanged from 24 hours ago"   >> final
   changed_str="(unchanged) "
fi

if [ $changed != 0 ] ; then
   echo "=================================================" >> final
   echo "== Difference between 24 hours ago and now     ==" >> final
   echo "=================================================" >> final
   echo                                                     >> final
   cat diff.short                                           >> final
   echo                                                     >> final
fi

# Always show the current results.
echo                                                     >> final
echo "=================================================" >> final
echo "== Current results                             ==" >> final
echo "=================================================" >> final
cat new.short >> final
echo                                                     >> final

if [ $changed != 0 ] ; then
   echo "=================================================" >> final
   echo "== Results from 24 hours ago                   ==" >> final
   echo "=================================================" >> final
   cat old.short                                            >> final
   echo                                                     >> final
fi

# Use the conf/<tag>.sendmail script to email the results.
conf/$ABT_MACHINE.sendmail \
   "$changed_str$ABT_START nightly build ($ABT_MACHINE, $ABT_DETAILS)" \
   final > sendmail.log 2>&1