libs-base/make-diff

#!/bin/sh

# The directory in which to find the last snapshot
dir=../releases

# The email addresses of people to receive mail about the new diff
diff_recipients=drepper

# The name of this module
module=gstep-base
# A regular expression for the six-digit date string "yymmdd"
yrptn='[0-9][0-9][0-9][0-9][0-9][0-9]'
# The pattern for the file containing the diff
ptn="${module}-${yrptn}"
dptn="${ptn}-${yrptn}.diff"

# Get the current date
date=`date +%y%m%d`

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

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

# Will we make a CVS tag for this snapshot?  An empty value means `tag it'.
# Always disabled for now.
notag=yes

if [ $lastsnap = $date ]; then
  if [ $lastdiff = $lastsnap ]; then
    echo "$0: Snapshot diff for ${module}-${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

# The name of the diff file
diff="${module}-${lastdiff}-${date}.diff"
echo Making $diff

# If $notag is empty, `cvs rtag' the repository
#test -z "$notag" && cvs -q rtag -F snapshot-$date $module

# Have cvs make the diff for us.
#cvs -q rdiff -u -r snapshot-$lastdiff -r snapshot-$date $module >$diff || exit
cvs rdiff -u -r snapshot-$lastdiff $module > $diff || exit

if [ -s $diff ]; then
  # Mail a message saying the new diff is available. (Commented out for now)
  # mail -s $diff < $diff $diff_recipients
  gzip -9 $diff && mv -f $diff.gz $dir
else
  rm -f $diff
fi