#!/bin/sh

dir=/com/share/ftp/roland
diff_recipients=drepper

module=libc
yrptn='[0-9][0-9][0-9][0-9][0-9][0-9]'
ptn="${module}-${yrptn}"
dptn="${ptn}-${yrptn}.diff"

date=`date +%y%m%d`

lastsnap=`cd $dir; ls $ptn.tar.gz $dptn $dptn.gz 2>/dev/null |
                   sed -e "s/^.*\\(${yrptn}\\)[.a-z]*$/\\1/" |
                   sort -nr | head -1`

lastdiff=`cd $dir; ls $dptn $dptn.gz 2>/dev/null |
                    sed -e "s/^.*\\(${yrptn}\\)[.a-z]*$/\\1/" |
                    sort -nr | head -1`

notag=

if [ $lastsnap = $date ]; then
  if [ $lastdiff = $lastsnap ]; then
    echo "$0: Snapshot ${module}-${date} already made, skipping."
    exit 0
  fi

  # There is already a full snapshot for this date, but no diffs.
  # Don't re-tag, just make diffs.
  notag=yes
  lastsnap=$lastdiff
fi

diff="${module}-${lastdiff}-${date}.diff"
test -z "$notag" && cvs -q rtag -F libc-$date $module
cvs -q rdiff -u -r $module-$lastdiff -r $module-$date $module > $diff || exit

if [ -s $diff ]; then
  mail -s $diff < $diff $diff_recipients
  gzip -9 $diff && mv -f $diff.gz $dir
else
  rm -f $diff
fi