remakepkg

#!/bin/sh
# This file is part of the Heresy Plugins
# http://github.com/idlemoor/heresy
#
# Copyright 2017 David Spencer, Baildon, West Yorkshire, U.K.
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
#===============================================================================
#
# /usr/sbin/remakepkg
#
# Reconstruct a Slackware package from the running system and the saved metadata
# in /var/log/packages and /var/log/scripts
#
# removepkg -copy is an alternative, but this script outputs a complete package,
# including (for rollback purposes) the current version of config files in /etc.
#
#===============================================================================

[ -n "$1" ] || { echo "Usage: remakepkg [--quiet|-q] [/var/log/packages/]pkgname..." >&2; exit 0; }

TMP="${TMP:-$(mktemp -d -p /tmp remakepkg.XXXXXX)}"
OUTPUT="${OUTPUT:-/tmp}"
mkdir -p "$OUTPUT"
EXTRATAG="${EXTRATAG:-_remakepkg}"

if [ "$1" = '-q' ] || [ "$1" = '--quiet' ]; then
  QUIET='>/dev/null 2>&1'
  shift
fi

while [ "${1:-}" != '' ]; do

  arg=$(basename ${1%.t?z})
  shift

  if [ -f /var/log/packages/"$arg" ]; then
    # exact match!
    pkgnam="$arg"
  else
    # we want exactly one installed package
    pkgnam=""
    for pkgpath in $(find /var/log/packages/"$arg"* -type f -maxdepth 0 2>/dev/null); do
      trypkg=$(basename $pkgpath)
      trybase="$(echo "$trypkg" | rev | cut -f4- -d- | rev)"
      if [ "$trybase" = "$arg" ]; then
        [ -z "$pkgnam" ] || { echo "remakepkg: /var/log/packages is broken: $arg" >&2; exit 5; }
        pkgnam="$trypkg"
      fi
    done
    [ -n "$pkgnam" ] || { echo "remakepkg: Package is not installed: $arg" >&2; exit 4; }
  fi

  PKG=$TMP/package-"$pkgnam"
  mkdir -p $PKG/install
  cd $PKG

  csplit --quiet --prefix $TMP/meta /var/log/packages/"$pkgnam" \
    '/^PACKAGE LOCATION:/' \
    '/^PACKAGE DESCRIPTION:$/' \
    '/^FILE LIST:$/'
  pkgtype=$(head -1 $TMP/meta01 | sed 's/.*\.//')
  tail -1 $TMP/meta02 > $PKG/install/slack-desc
  grep -v -E '^FILE LIST:|^\./$|^install|^etc\/.*\.new$' $TMP/meta03 | \
    sed -e 's:^:/:' | \
    cpio -pdm --quiet $PKG 2>/dev/null
  grep '^etc\/.*\.new$' $TMP/meta03 | \
    while read config; do
      mkdir -p $PKG/$(dirname "$config")
      if [ -f /"$config" ]; then
        cp -a /"$config" $PKG/"$config"
      elif [ -f /"${config%.new}" ]; then
        cp -a /"${config%.new}" $PKG/"$config"
      fi
    done
  rm $TMP/meta*

  if [ -f /var/log/scripts/"$pkgnam" ]; then
    cp -a /var/log/scripts/"$pkgnam" $PKG/install/doinst.sh
  fi

  # If the current installed package is already tagged with EXTRATAG,
  # we don't want to add *another* EXTRATAG on the end :)
  case "$pkgnam" in
  *"$EXTRATAG") 
    ADDTAG='' ;;
  *)
    ADDTAG="$EXTRATAG" ;;
  esac

  eval \
    XZ_OPT="--threads=0" \
    /sbin/makepkg -l y -c n "${OUTPUT}"/"${pkgnam}${ADDTAG}.${PKGTYPE:-$pkgtype}" $QUIET \
    || exit $?

  cd - >/dev/null
  rm -rf $PKG

done

rmdir $TMP

exit 0

#===============================================================================