path: root/contrib/bacman.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
#
#   (c) 2008 - locci <carlocci_at_gmail_dot_com>
#
#   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

readonly progname="bacman"
readonly progver="0.2.1"

#
# User Friendliness
#
usage() {
	echo "This program recreates a package using pacman's db and system files"
	echo "Usage:   $progname <installed package name>"
	echo "Example: $progname kernel26"
}

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

if [[ $1 == "--help" || $1 == "-h" ]]; then
	usage
	exit 0
fi

if [[ $1 == "--version" || $1 == "-v" ]]; then
	echo "$progname version $progver"
	echo "Copyright (C) 2008 locci"
	exit 0
fi

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

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

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

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

pkg_name="$1"
pkg_dir="$(echo $pac_db/$pkg_name-[0-9]*)"
pkg_namver="${pkg_dir##*/}"

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

if [[ ! -d $pkg_dir ]]; then
	echo "ERROR: package ${pkg_name} not found in pacman database"
	exit 1
fi

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

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

cat "$pkg_dir"/files |
while read i; do
	if [[ -z $i ]]; then
		continue
	fi

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

	case "$current" in
		%FILES%)
			ret=0
			if [[ -e /$i ]]; then
				bsdtar -cnf - "/$i" 2> /dev/null | bsdtar -xpf -

				# Workaround to bsdtar not reporting a missing file as an error
				if ! [[ -e $work_dir/$i || -L $work_dir/$i ]]; then
					echo ""
					echo "ERROR: unable to add /$i to the package"
					echo "       If your user does not have permssion to read this file then"
					echo "       you will need to run $progname as root"
					rm -rf "$work_dir"
					exit 1
				fi
			else
				echo ""
				echo "WARNING: package file /$i is missing"
				echo ""
			fi
			;;
	esac
done

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
#
echo Generating .PKGINFO metadata...
echo "# Generated by $progname $progver"    > .PKGINFO
if [[ $INFAKEROOT == "1" ]]; then
	echo "# Using $(fakeroot -v)"    >> .PKGINFO
fi
echo "# $(LC_ALL=C date)"            >> .PKGINFO
echo "#"                    >> .PKGINFO

cat "$pkg_dir"/{desc,files} |
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
			;;
		%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

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
#
echo "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 ;;
	*) echo "WARNING: '%s' is not a valid archive extension." \
	"$PKGEXT" >&2; cat ;;
esac > "${pkg_file}"; ret=$?

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

rm -rf "$work_dir"

echo Done

exit 0

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