#!/bin/sh

#set -x
   
# Given a list of dirs, for each subdir in those dirs which is a CVS
# archive it produces a diff file that is compatible with cvspatch.

yesterday_date=`date --date "1 day ago" +"%Y-%m-%d"`
date=`date +"%Y-%m-%d"`
time="00:00:00"
   
cvsdate="$yesterday_date $time"
   
pwd=`pwd`

for dir in $@
do
    for subdir in `ls $dir`
    do
        if [ -d $dir/$subdir/CVS ]
        then
	    olddiff=`ls -t $pwd/$subdir-*.diff.gz | head -1`
	    oldrevisions=`ls -t $pwd/$subdir-*.revisions.gz | head -1`
	    diff=$pwd/$subdir-$date.diff.gz
	    revisions=$pwd/$subdir-$date.revisions.gz

	    # If there is no backup, make one
	    if [ z"$olddiff" == z  ] ; then 
	    	echo "No backup for $dir/$subdir, making one"
		(cd $dir/$subdir; cvs diff -u -N . 2> /dev/null |
		    gzip -9 > $diff)
		(cd $dir/$subdir; find . -path '*CVS*' -name Entries \
		 	-exec backuprevisions '{}' ';' | gzip -9 > $revisions)
	    # If there are changes in the directory since the backup,
	    # make a new backup.
	    elif [ x"`find $dir/$subdir/* -newer $olddiff`" != x ] ; then
	    	echo "Changes in $dir/$subdir, making new backup"
		(cd $dir/$subdir; cvs -f diff -u -N . 2> /dev/null |
		    gzip -9 > $diff)
		(cd $dir/$subdir; find . -path '*CVS*' -name Entries \
		 	-exec backuprevisions '{}' ';' | gzip -9 > $revisions)
	    else
	    	touch $olddiff 
	    	touch $oldrevisions 
	    fi
        fi
    done
done

# delete all the backups over 7 days old
find . -name "*.diff.gz" -mtime +7 -exec rm '{}' ';'
find . -name "*.revisions.gz" -mtime +7 -exec rm '{}' ';'