#!/bin/bash
set -x

# A simple script to recomress the archive
#
#
# (C) 2010 by Adrian Schröter <adrian@suse.de>
#
# 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.
# See http://www.gnu.org/licenses/gpl-2.0.html for full license text.


# defaults
MYCOMPRESSION=""
RENAME_PATTERN=""
FILES=""

while test $# -gt 0; do
  case $1 in
    *-compression)
      MYCOMPRESSION="$2"
      shift
    ;;
    *-rename_pattern)
      RENAME_PATTERN="$2"
      shift
    ;;
    *-file)
      FILES="$FILES ${2##*/}"
      shift
    ;;
    *-outdir)
      MYOUTDIR="$2"
      shift
    ;;
    *)
      echo Unknown parameter $1.
      echo 'Usage: recompress --compression $COMPRESSION --rename_pattern $RENAME_PATTERN --file $FILE --outdir $OUT'
      exit 1
    ;;
  esac
  shift
done

if [ -z "$MYCOMPRESSION" ]; then
  MYCOMPRESSION="bz2"
fi
if [ -z "$FILES" ]; then
  echo "ERROR: no inputs files are given via --file parameter!"
  exit 1
fi
if [ -z "$MYOUTDIR" ]; then
  echo "ERROR: no output directory is given via --outdir parameter!"
  exit 1
fi
if [ -n $RENAME_PATTERN ] ; then
  MYVERSION=""
  MYRELEASE=""
  if [ -f _service:extract_version:release ]; then
    MYRELEASE=`cat _service:extract_version:release`
  fi
  if [ -f _service:extract_version:version ]; then
    MYVERSION=`cat _service:extract_version:version`
  fi
  RENAME_PATTERN=${RENAME_PATTERN//%RELEASE%/$MYRELEASE}
  RENAME_PATTERN=${RENAME_PATTERN//%VERSION%/$MYVERSION}
fi

for i in $FILES; do
  FILE=`ls -1 $i`
  UNCOMPRESS="cat"
  BASENAME="$FILE"
  if [ "${FILE%.gz}" != "$FILE" ]; then
    UNCOMPRESS="gunzip -c"
    BASENAME="${FILE%.gz}"
  elif [ "${FILE%.bz2}" != "$FILE" ]; then
    UNCOMPRESS="bunzip2 -c"
    BASENAME="${FILE%.bz2}"
  elif [ "${FILE%.xz}" != "$FILE" ]; then
    UNCOMPRESS="xz -dc"
    BASENAME="${FILE%.xz}"
  fi
  $UNCOMPRESS "$FILE" > "$MYOUTDIR/$BASENAME" || exit 1

  if [ -n $RENAME_PATTERN ]; then
    if [ "${BASENAME%.tar}"  != "$BASENAME" ]; then
      tar xf $MYOUTDIR/$BASENAME -C $MYOUTDIR || exit 1
      OLDDIR=${BASENAME%.tar}
      OLDDIR=${OLDDIR##_service:*:}
      mv "$MYOUTDIR/$OLDDIR" "$MYOUTDIR/$RENAME_PATTERN" || exit 1
      tar cf "$MYOUTDIR/$RENAME_PATTERN.tar" -C $MYOUTDIR $RENAME_PATTERN || exit 1
      rm -rf "$MYOUTDIR/$RENAME_PATTERN" "$MYOUTDIR/$BASENAME"|| exit 1
      BASENAME="$RENAME_PATTERN.tar"
    fi
  fi

  if [ "$MYCOMPRESSION" == "gz" ]; then
    gzip  "$MYOUTDIR/$BASENAME"
  elif [ "$MYCOMPRESSION" == "bz2" ]; then
    bzip2  "$MYOUTDIR/$BASENAME"
  elif [ "$MYCOMPRESSION" == "xz" ]; then
    xz  "$MYOUTDIR/$BASENAME"
  elif [ "$MYCOMPRESSION" == "none" ]; then
    COMPRESS="cat -"
  else
    echo "ERROR: Unknown compression $MYCOMPRESSION"
    exit 1
  fi


  if [ "${FILE#_service:}" != "$FILE" ]; then
    # we can remove service files, no need to store them twice
    rm -f "$FILE"
  fi
done

exit 0