#! /bin/sh

# This script uses cat2rsyncbatch to create rsync batch files to
# re-create redundant iso files in a Fedora Core or similar GNU/Linux
# distributions.  The iso files considered redundant are SRPMS for
# arches other than i386, as well as rescuecd and DVD images.

# Copyright 2003, 2005 Alexandre Oliva <oliva@lsd.ic.unicamp.br>

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

case $1 in
-n)
  dryrun=:; shift
  ;;
esac

relative_path () {
(
# This script computes a relative pathname from $1 to $2
# They are assumed to not contain . or .. pathname components,
# but if both directories exist and cd/pwd canonicalizes pathnames,
# this shouldn't matter.  PWD_CMD may be set to some pwd command that does.

# Copyright 2003 Alexandre Oliva <aoliva@redhat.com>

from=`(cd $1 > /dev/null && ${PWD_CMD-pwd} || echo $1) 2>/dev/null | sed 's,//*,/,g;s,/*$,,'`
target=`(cd $2 > /dev/null && ${PWD_CMD-pwd} || echo $2) 2>/dev/null | sed 's,//*,/,g;s,/*$,,'`

case $from in /* | "") ;; *) from=`${PWD_CMD-pwd}`/$from ;; esac
case $target in /* | "") ;; *) target=`${PWD_CMD-pwd}`/$target ;; esac

case $target in
"$from" | "$from/"*)
  dots=`echo $from | sed s,.,.,g`
  echo $target | sed "s,^$dots/*,,;s,[^/]$,&/,"
  exit 0
  ;;
esac

case $from in
"$target/"*)
  dots=`echo $target | sed s,.,.,g`
  echo $from/ | sed "s,^$dots/*,,;s,[^/]$,&/,;s,[^/]*/*,../,g;s,[^/]$,&/,"
  exit 0
  ;;
esac

prefix=`echo $from///$target | sed 's,\(\(/[^/]*\)*\).*///\1.*,\1,'`
dots=`echo $prefix | sed s,.,.,g`
from=`echo $from | sed "s,^$dots,,"`
target=`echo $target | sed "s,^$dots,,"`

from=`echo $from | sed 's,[^/][^/]*,..,g;s,.$,&/,'`
echo ${from}$target/
)
}  

find "${@-.}" -name \*rescuecd.iso |
while read f; do
  if test -f $f.sh; then
    echo $f.sh already exists, skipping $f >&2
    continue
  fi
  if test -f $f.rsync.bz2; then
    echo $f.rsync.bz2 already exists, skipping $f >&2
    continue
  fi
  dir=`dirname $f`
  name=`basename $f -rescuecd.iso`
  if test ! -f "$dir/$name-disc1.iso"; then
    echo $dir/$name-disc1.iso does not exist, skipping $f >&2
    continue
  fi
  (
    $dryrun cd `dirname $f` &&
    $dryrun exec cat2rsyncbatch $name-rescuecd.iso $name-disc1.iso
  )
done

find "${@-.}" -name \*-disc\?.iso ! -name \*SRPMS\* |
while read f; do
  if test -f $f.sh; then
    echo $f.sh already exists, skipping $f >&2
    continue
  fi
  if test -f $f.rsync.bz2; then
    echo $f.rsync.bz2 already exists, skipping $f >&2
    continue
  fi
  dir=`dirname $f`
  name=`basename $f .iso`
  base=`echo $name | sed 's,-disc[0-9]*$,,'`
  
  if test ! -f "$dir/$base-DVD.iso"; then
    echo $dir/$name-DVD.iso does not exist, skipping $f >&2
    continue
  fi
  (
    $dryrun cd `dirname $f` &&
    $dryrun exec cat2rsyncbatch $name.iso $base-DVD.iso
  )
done

find "${@-.}" -name \*DVD.iso |
while read f; do
  if test -f $f.sh; then
    echo $f.sh already exists, skipping $f >&2
    continue
  fi
  if test -f $f.rsync.bz2; then
    echo $f.rsync.bz2 already exists, skipping $f >&2
    continue
  fi
  dir=`dirname $f`
  name=`basename $f -DVD.iso`
  if test ! -f "$dir/$name-disc1.iso"; then
    echo $dir/$name-disc1.iso does not exist, skipping $f >&2
    continue
  fi
  (
    $dryrun cd `dirname $f` &&
    $dryrun exec cat2rsyncbatch $name-DVD.iso $name-disc?.iso
  )
done

find "${@-.}" -name \*SRPMS-disc1.iso |
while read f; do
  case $f in
  *-i386-*) pat=s,i386,x86_64,g;;
  *-x86_64-*) pat=s,x86_64,i386,g;;
  *) continue ;;
  esac

  from=`echo $f | sed -e "$pat"`
  if test ! -f $from; then
    echo $from does not exist, skipping $f >&2
    continue
  fi

  dir=`dirname $f`
  name=`basename $f -disc1.iso`
  if test -f $dir/$name.tar.sh; then
    echo $dir/$name.tar.sh already exists, skipping $f >&2
    continue
  fi
  if test -f $dir/$name.tar.rsync.bz2; then
    echo $dir/$name.tar.rsync.bz2 already exists, skipping $f >&2
    continue
  fi

  fromdir=`dirname $from`
  fromname=`basename $from -disc1.iso`

  fromdirrelative=`relative_path $dir $fromdir`
  (
    $dryrun cd $dir
    $dryrun tar -cvf $name.tar $name-disc?.iso
    $dryrun exec cat2rsyncbatch $name.tar ${fromdirrelative}$fromname-disc?.iso
    rm -f $name.tar
  )
done