path: root/contrib/bacman.sh.in

#!/bin/bash
#
#   bacman: recreate a package from a running system
#   This script rebuilds an already installed package using metadata
#   stored into the pacman database and system files
#
#   Copyright (c) 2008 locci <carlocci_at_gmail_dot_com>
#   Copyright (c) 2008-2014 Pacman Development Team <pacman-dev@archlinux.org>
#
#   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, see <http://www.gnu.org/licenses/>.
#

shopt -s extglob
shopt -s nullglob

declare -r myname='bacman'
declare -r myver='@PACKAGE_VERSION@'
USE_COLOR='y'
INCLUDE_PACNEW='n'
# Required for fakeroot because options are shifted off the array.
ARGS=("$@")

m4_include(../scripts/library/output_format.sh)

#
# User Friendliness
#
usage() {
  echo "${myname} (pacman) v${myver}"
  echo
  echo "Recreate a package using pacman's database and system files"
  echo
  echo "Usage: ${myname} [--nocolor] [--pacnew] <installed package name>"
  echo
  echo "Example: ${myname} linux-headers"
}

version() {
  printf "%s %s\n" "$myname" "$myver"
  echo 'Copyright (C) 2008 locci <carlocci_at_gmail_dot_com>'
  echo 'Copyright (C) 2008-2014 Pacman Development Team <pacman-dev@archlinux.org>'
}

while [[ ! -z $1 ]]; do
  if [[ $1 == "--nocolor" ]]; then
    USE_COLOR='n'
    shift
  elif [[ $1 == "--pacnew" ]]; then
    INCLUDE_PACNEW='y'
    shift
  else
    break
  fi
done

m4_include(../scripts/library/term_colors.sh)

if (( $# != 1 )); then
  usage
  exit 1
fi

if [[ $1 = -@(h|-help) ]]; then
  usage
  exit 0
elif [[ $1 = -@(V|-version) ]]; then
  version
  exit 0
fi

#
# Fakeroot support
#
if (( EUID )); then
  if [[ -f /usr/bin/fakeroot ]]; then
    msg "Entering fakeroot environment"
    export INFAKEROOT="1"
    /usr/bin/fakeroot -u -- "$0" "${ARGS[@]}"
    exit $?
  else
    warning "installing fakeroot or running $myname as root is required to"
    plain   "         preserve the ownership permissions of files in some packages\n"
  fi
fi

#
# Setting environmental variables
#
if [[ ! -r @sysconfdir@/pacman.conf ]]; then
  error "unable to read @sysconfdir@/pacman.conf"
  exit 1
fi

eval $(awk '/DBPath/ {print $1$2$3}' @sysconfdir@/pacman.conf)
pac_db="${DBPath:-@localstatedir@/lib/pacman/}/local"

if [[ ! -r @sysconfdir@/makepkg.conf ]]; then
  error "unable to read @sysconfdir@/makepkg.conf"
  exit 1
fi

source "@sysconfdir@/makepkg.conf"
if [[ -r ~/.makepkg.conf ]]; then
  source ~/.makepkg.conf
fi

pkg_dest="${PKGDEST:-$PWD}"
pkg_pkger=${PACKAGER:-'Unknown Packager'}

pkg_name="$1"
pkg_dir=("$pac_db/$pkg_name"-+([^-])-+([^-]))
pkg_namver=("${pkg_dir[@]##*/}")

#
# Checks everything is in place
#
if [[ ! -d $pac_db ]]; then
  error "pacman database directory ${pac_db} not found"
  exit 1
fi

if (( ${#pkg_dir[@]} != 1 )); then
  error "%d entries for package %s found in pacman database" \
    ${#pkg_dir[@]} "${pkg_name}"
  msg2 "%s" "${pkg_dir[@]}"
  exit 1
fi

if [[ ! -d $pkg_dir ]]; then
  error "package %s is found in pacman database," "${pkg_name}"
  plain "       but '%s' is not a directory" "${pkg_dir}"
  exit 1
fi

#
# Begin
#
msg "Package: ${pkg_namver}"
work_dir=$(mktemp -d --tmpdir bacman.XXXXXXXXXX)
cd "$work_dir" || exit 1

#
# File copying
#
msg2 "Copying package files..."

while read i; do
  if [[ -z $i ]]; then
    continue
  fi

  if [[ $i == %+([A-Z])% ]]; then
    current=$i
    continue
  fi

  case "$current" in
    %FILES%)
      local_file="/$i"
      package_file="$work_dir/$i"

      if [[ ! -e $local_file ]]; then
        warning "package file $local_file is missing"
        continue
      fi
      ;;

    %BACKUP%)
      # Get the MD5 checksum.
      original_md5="${i##*$'\t'}"
      # Strip the md5sum after the tab.
      i="${i%$'\t'*}"
      local_file="/$i.pacnew"
      package_file="$work_dir/$i"

      # Include unmodified .pacnew files.
      local_md5="$(md5sum "$local_file" | cut -d' ' -f1)"
      if [[ $INCLUDE_PACNEW == 'n' ]] \
      || [[ ! -e $local_file ]] \
      || [[ $local_md5 != $original_md5 ]]; then
        # Warn about modified files.
        local_md5="$(md5sum "/$i" | cut -d' ' -f1)"
        if [[ $local_md5 != $original_md5 ]]; then
          warning "package file /$i has been modified"
        fi
        # Let the normal file be included in the %FILES% list.
        continue
      fi
      ;;

    *)
      continue
      ;;
  esac

  ret=0
  bsdtar -cnf - -s'/.pacnew$//' "$local_file" 2> /dev/null | bsdtar -xpf - 2> /dev/null

  # Workaround to bsdtar not reporting a missing file as an error
  if ! [[ -e $package_file || -L $package_file ]]; then
    error "unable to add $local_file to the package"
    plain "       If your user does not have permission to read this file, then"
    plain "       you will need to run $myname as root."
    rm -rf "$work_dir"
    exit 1
  fi
done < "$pkg_dir"/files

ret=$?
if (( ret )); then
  rm -rf "$work_dir"
  exit 1
fi

pkg_size=$(du -sk | awk '{print $1 * 1024}')

#
# .PKGINFO stuff
# TODO adopt makepkg's write_pkginfo() into this or scripts/library
#
msg2 "Generating .PKGINFO metadata..."
echo "# Generated by $myname $myver"    > .PKGINFO
if [[ $INFAKEROOT == "1" ]]; then
  echo "# Using $(fakeroot -v)"    >> .PKGINFO
fi
echo "# $(LC_ALL=C date)"            >> .PKGINFO
echo "#"                    >> .PKGINFO

while read i; do
  if [[ -z $i ]]; then
    continue;
  fi

  if [[ $i == %+([A-Z])% ]]; then
    current=$i
    continue
  fi

  case "$current" in
    # desc
    %NAME%)
      echo "pkgname = $i"    >> .PKGINFO
      ;;
    %VERSION%)
      echo "pkgver = $i"    >> .PKGINFO
      ;;
    %DESC%)
      echo "pkgdesc = $i"    >> .PKGINFO
      ;;
    %URL%)
      echo "url = $i"    >> .PKGINFO
      ;;
    %LICENSE%)
      echo "license = $i"    >> .PKGINFO
      ;;
    %ARCH%)
      echo "arch = $i"    >> .PKGINFO
      pkg_arch="$i"
      ;;
    %BUILDDATE%)
      echo "builddate = $(date -u "+%s")"    >> .PKGINFO
      ;;
    %PACKAGER%)
      echo "packager = $pkg_pkger"        >> .PKGINFO
      ;;
    %SIZE%)
      echo "size = $pkg_size"        >> .PKGINFO
      ;;
    %GROUPS%)
      echo "group = $i"    >> .PKGINFO
      ;;
    %REPLACES%)
      echo "replaces = $i"    >> .PKGINFO
      ;;
    %DEPENDS%)
      echo "depend = $i"   >> .PKGINFO
      ;;
    %OPTDEPENDS%)
      echo "optdepend = $i" >> .PKGINFO
      ;;
    %CONFLICTS%)
      echo "conflict = $i" >> .PKGINFO
      ;;
    %PROVIDES%)
      echo "provides = $i"  >> .PKGINFO
      ;;

    # files
    %BACKUP%)
      # Strip the md5sum after the tab
      echo "backup = ${i%%$'\t'*}"   >> .PKGINFO
      ;;
  esac
done < <(cat "$pkg_dir"/{desc,files})

comp_files=".PKGINFO"

if [[ -f $pkg_dir/install ]]; then
  cp "$pkg_dir/install" "$work_dir/.INSTALL"
  comp_files+=" .INSTALL"
fi
if [[ -f $pkg_dir/changelog ]]; then
  cp "$pkg_dir/changelog" "$work_dir/.CHANGELOG"
  comp_files+=" .CHANGELOG"
fi

#
# Fixes owner:group and permissions for .PKGINFO, .CHANGELOG, .INSTALL
#
chown root:root "$work_dir"/{.PKGINFO,.CHANGELOG,.INSTALL} 2> /dev/null
chmod 644 "$work_dir"/{.PKGINFO,.CHANGELOG,.INSTALL} 2> /dev/null

#
# Generate the package
#
msg2 "Generating the package..."

pkg_file="$pkg_dest/$pkg_namver-$pkg_arch${PKGEXT}"
ret=0

# TODO: Maybe this can be set globally for robustness
shopt -s -o pipefail
bsdtar -cf - $comp_files * |
case "$PKGEXT" in
  *tar.gz)  gzip -c -f -n ;;
  *tar.bz2) bzip2 -c -f ;;
  *tar.xz)  xz -c -z - ;;
  *tar.Z)   compress -c -f ;;
  *tar)     cat ;;
  *) warning "'%s' is not a valid archive extension." \
  "$PKGEXT"; cat ;;
esac > "${pkg_file}"; ret=$?

if (( ret )); then
  error "Unable to write package to $pkg_dest"
  plain "       Maybe the disk is full or you do not have write access"
  rm -rf "$work_dir"
  exit 1
fi

rm -rf "$work_dir"

msg "Done."

exit 0

# vim: set ts=2 sw=2 noet: