#!@BASH_SHELL@
#
#   repo-add - add a package to a given repo database file
#   repo-remove - remove a package entry from a given repo database file
#   @configure_input@
#
#   Copyright (c) 2006-2008 Aaron Griffin <aaron@archlinux.org>
#   Copyright (c) 2007-2008 Dan McGee <dan@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/>.

# gettext initialization
export TEXTDOMAIN='pacman'
export TEXTDOMAINDIR='@localedir@'

myver='@PACKAGE_VERSION@'
confdir='@sysconfdir@'

QUIET=0
DELTA=0
WITHFILES=0
REPO_DB_FILE=
LOCKFILE=
CLEAN_LOCK=0

# ensure we have a sane umask set
umask 0022

msg() {
	(( QUIET )) && return
	local mesg=$1; shift
	printf "==> ${mesg}\n" "$@" >&1
}

msg2() {
	(( QUIET )) && return
	local mesg=$1; shift
	printf "  -> ${mesg}\n" "$@" >&1
}

warning() {
	local mesg=$1; shift
	printf "==> $(gettext "WARNING:") ${mesg}\n" "$@" >&2
}

error() {
	local mesg=$1; shift
	printf "==> $(gettext "ERROR:") ${mesg}\n" "$@" >&2
}

# print usage instructions
usage() {
	printf "repo-add, repo-remove (pacman) %s\n\n" "$myver"
	printf "$(gettext "Usage: repo-add [-d] [-f] [-q] <path-to-db> <package|delta> ...\n")"
	printf "$(gettext "Usage: repo-remove [-q] <path-to-db> <packagename|delta> ...\n\n")"
	printf "$(gettext "\
repo-add will update a package database by reading a package file.\n\
Multiple packages to add can be specified on the command line.\n\n")"
	printf "$(gettext "\
repo-remove will update a package database by removing the package name\n\
specified on the command line from the given repo database. Multiple\n\
packages to remove can be specified on the command line.\n\n")"
	printf "$(gettext "\
Use the -q/--quiet flag to minimize output to basic messages, warnings,\n\
and errors.\n\n")"
	printf "$(gettext "\
Use the -d/--delta flag to automatically generate and add a delta file\n\
between the old entry and the new one, if the old package file is found\n\
next to the new one.\n\n")"
	printf "$(gettext "\
Use the -f/--files flag to update a database including file entries.\n\n")"
	echo "$(gettext "Example:  repo-add /path/to/repo.db.tar.gz pacman-3.0.0.pkg.tar.gz")"
	echo "$(gettext "Example:  repo-remove /path/to/repo.db.tar.gz kernel26")"
}

version() {
	printf "repo-add, repo-remove (pacman) %s\n\n" "$myver"
	printf "$(gettext "\
Copyright (C) 2006-2008 Aaron Griffin <aaron@archlinux.org>.\n\
Copyright (c) 2007-2008 Dan McGee <dan@archlinux.org>.\n\n\
This is free software; see the source for copying conditions.\n\
There is NO WARRANTY, to the extent permitted by law.\n")"
}

# write a list entry
#		arg1 - Entry name
#		arg2 - List
#		arg3 - File to write to
write_list_entry() {
	if [[ -n $2 ]]; then
		echo "%$1%" >>$3
		echo -e $2 >>$3
	fi
}

find_pkgentry()
{
	local pkgname=$1
	local pkgentry
	for pkgentry in $tmpdir/$pkgname*; do
		name=${pkgentry##*/}
		if [[ ${name%-*-*} = $pkgname ]]; then
			echo $pkgentry
			return 0
		fi
	done
	return 1
}

# Get the package name from the delta filename
get_delta_pkgname() {
	local tmp

	tmp=${1##*/}
	echo ${tmp%-*-*_to*}
}

# write a delta entry
#   arg1 - path to delta file
db_write_delta()
{
	deltafile="$1"
	pkgname="$(get_delta_pkgname $deltafile)"

	pkgentry=$(find_pkgentry $pkgname)
	if [[ -z $pkgentry ]]; then
		error "$(gettext "No database entry for package '%s'.")" "$pkgname"
		return 1
	fi
	deltas="$pkgentry/deltas"
	if [[ ! -f $deltas ]]; then
		echo -e "%DELTAS%" >$deltas
	fi
	# get md5sum and compressed size of package
	md5sum="$(openssl dgst -md5 "$deltafile")"
	md5sum="${md5sum##* }"
	csize=$(@SIZECMD@ "$deltafile")

	oldfile=$(xdelta3 printhdr $deltafile | grep "XDELTA filename (source)" | sed 's/.*: *//')
	newfile=$(xdelta3 printhdr $deltafile | grep "XDELTA filename (output)" | sed 's/.*: *//')

	if grep -q "$oldfile.*$newfile" $deltas; then
		sed -i.backup "/$oldfile.*$newfile/d" $deltas && rm -f $deltas.backup
	fi
	msg2 "$(gettext "Adding 'deltas' entry : %s -> %s")" "$oldfile" "$newfile"
	echo ${deltafile##*/} $md5sum $csize $oldfile $newfile >> $deltas

	return 0
} # end db_write_delta

# remove a delta entry
#   arg1 - path to delta file
db_remove_delta()
{
	deltafile="$1"
	filename=${deltafile##*/}
	pkgname="$(get_delta_pkgname $deltafile)"

	pkgentry=$(find_pkgentry $pkgname)
	if [[ -z $pkgentry ]]; then
		return 1
	fi
	deltas="$pkgentry/deltas"
	if [[ ! -f $deltas ]]; then
		return 1
	fi
	if grep -q "$filename" $deltas; then
		sed -i.backup "/$filename/d" $deltas && rm -f $deltas.backup
		msg2 "$(gettext "Removing existing entry '%s'...")" "$filename"
		return 0
	fi

	return 1
} # end db_remove_delta

# write an entry to the pacman database
#   arg1 - path to package
db_write_entry()
{
	# blank out all variables
	local pkgfile="$1"
	local pkgname pkgver pkgdesc csize size md5sum url arch builddate packager \
		_groups _licenses _replaces _depends _conflicts _provides _optdepends

	local OLDIFS="$IFS"
	# IFS (field separator) is only the newline character
	IFS="
"

	# read info from the zipped package
	local line var val
	for line in $(bsdtar -xOqf "$pkgfile" .PKGINFO |
			grep -v '^#' | sed 's|\(\w*\)\s*=\s*\(.*\)|\1 \2|'); do
		# bash awesomeness here- var is always one word, val is everything else
		var=${line%% *}
		val=${line#* }
		declare $var="$val"
		case "$var" in
			group)    _groups="$_groups$group\n" ;;
			license)  _licenses="$_licenses$license\n" ;;
			replaces) _replaces="$_replaces$replaces\n" ;;
			depend)   _depends="$_depends$depend\n" ;;
			conflict) _conflicts="$_conflicts$conflict\n" ;;
			provides) _provides="$_provides$provides\n" ;;
			optdepend) _optdepends="$_optdepends$optdepend\n" ;;
		esac
	done

	IFS=$OLDIFS

	# get md5sum and compressed size of package
	md5sum="$(openssl dgst -md5 "$pkgfile")"
	md5sum="${md5sum##* }"
	csize=$(@SIZECMD@ "$pkgfile")

	# ensure $pkgname and $pkgver variables were found
	if [[ -z $pkgname || -z $pkgver ]]; then
		error "$(gettext "Invalid package file '%s'.")" "$pkgfile"
		return 1
	fi

	pushd "$tmpdir" >/dev/null
	if [[ -d $pkgname-$pkgver ]]; then
		warning "$(gettext "An entry for '%s' already existed")" "$pkgname-$pkgver"
	else
		if (( DELTA )); then
			pkgentry=$(find_pkgentry $pkgname)
			if [[ -n $pkgentry ]]; then
				local oldfilename=$(grep -A1 FILENAME $pkgentry/desc | tail -n1)
				local oldfile="$(dirname $1)/$oldfilename"
			fi
		fi
	fi

	# remove an existing entry if it exists, ignore failures
	db_remove_entry "$pkgname"

	# create package directory
	mkdir "$pkgname-$pkgver"
	pushd "$pkgname-$pkgver" >/dev/null

	# restore an eventual deltas file
	[[ -f ../$pkgname.deltas ]] && mv "../$pkgname.deltas" deltas

	# create desc entry
	msg2 "$(gettext "Creating '%s' db entry...")" 'desc'
	echo -e "%FILENAME%\n$(basename "$1")\n" >>desc
	echo -e "%NAME%\n$pkgname\n" >>desc
	[[ -n $pkgbase ]] && echo -e "%BASE%\n$pkgbase\n" >>desc
	echo -e "%VERSION%\n$pkgver\n" >>desc
	[[ -n $pkgdesc ]] && echo -e "%DESC%\n$pkgdesc\n" >>desc
	write_list_entry "GROUPS" "$_groups" "desc"
	[[ -n $csize ]] && echo -e "%CSIZE%\n$csize\n" >>desc
	[[ -n $size ]] && echo -e "%ISIZE%\n$size\n" >>desc

	# compute checksums
	msg2 "$(gettext "Computing md5 checksums...")"
	echo -e "%MD5SUM%\n$md5sum\n" >>desc

	[[ -n $url ]] && echo -e "%URL%\n$url\n" >>desc
	write_list_entry "LICENSE" "$_licenses" "desc"
	[[ -n $arch ]] && echo -e "%ARCH%\n$arch\n" >>desc
	[[ -n $builddate ]] && echo -e "%BUILDDATE%\n$builddate\n" >>desc
	[[ -n $packager ]] && echo -e "%PACKAGER%\n$packager\n" >>desc
	write_list_entry "REPLACES" "$_replaces" "desc"

	# create depends entry
	msg2 "$(gettext "Creating '%s' db entry...")" 'depends'
	# create the file even if it will remain empty
	touch "depends"
	write_list_entry "DEPENDS" "$_depends" "depends"
	write_list_entry "CONFLICTS" "$_conflicts" "depends"
	write_list_entry "PROVIDES" "$_provides" "depends"
	write_list_entry "OPTDEPENDS" "$_optdepends" "depends"

	popd >/dev/null
	popd >/dev/null

	# create files file if wanted
	if (( WITHFILES )); then
		msg2 "$(gettext "Creating '%s' db entry...")" 'files'
		local files_path="$tmpdir/$pkgname-$pkgver/files"
		echo "%FILES%" >$files_path
		bsdtar --exclude='.*' -tf "$pkgfile" >>$files_path
	fi

	# create a delta file
	if (( DELTA )); then
		if [[ -n $oldfilename ]]; then
			if [[ -f $oldfile ]]; then
				delta=$(pkgdelta -q $oldfile $1)
				if [[ -f $delta ]]; then
					db_write_delta $delta
				fi
			else
				warning "$(gettext "Old package file not found: %s")" "$oldfilename"
			fi
		fi
	fi

	return 0
} # end db_write_entry

# remove existing entries from the DB
#   arg1 - package name
db_remove_entry() {
	local pkgname=$1
	local notfound=1
	local pkgentry=$(find_pkgentry $pkgname)
	while [[ -n $pkgentry ]]; do
		notfound=0
		if [[ -f $pkgentry/deltas ]]; then
			mv "$pkgentry/deltas" "$tmpdir/$pkgname.deltas"
		fi
		msg2 "$(gettext "Removing existing entry '%s'...")" \
		"$(basename $pkgentry)"
		rm -rf $pkgentry
		pkgentry=$(find_pkgentry $pkgname)
	done
	return $notfound
} # end db_remove_entry

check_repo_db()
{
	# check lock file
	if ( set -o noclobber; echo "$$" > "$LOCKFILE") 2> /dev/null; then
		CLEAN_LOCK=1
	else
		error "$(gettext "Failed to acquire lockfile: %s.")" "$LOCKFILE"
		[[ -f $LOCKFILE ]] && error "$(gettext "Held by process %s")" "$(cat $LOCKFILE)"
		exit 1
	fi

	if [[ -f $REPO_DB_FILE ]]; then
		# there are two situations we can have here- a DB with some entries,
		# or a DB with no contents at all.
		if ! bsdtar -tqf "$REPO_DB_FILE" '*/desc' >/dev/null 2>&1; then
			# check empty case
			if [[ -n $(bsdtar -tqf "$REPO_DB_FILE" '*' 2>/dev/null) ]]; then
				error "$(gettext "Repository file '%s' is not a proper pacman database.")" "$REPO_DB_FILE"
				exit 1
			fi
		fi
		msg "$(gettext "Extracting database to a temporary location...")"
		bsdtar -xf "$REPO_DB_FILE" -C "$tmpdir"
	else
		case "$cmd" in
			repo-remove)
			error "$(gettext "Repository file '%s' was not found.")" "$REPO_DB_FILE"
			exit 1
			;;
			repo-add)
			# check if the file can be created (write permission, directory existence, etc)
			if ! touch "$REPO_DB_FILE"; then
				error "$(gettext "Repository file '%s' could not be created.")" "$REPO_DB_FILE"
				exit 1
			fi
			rm -f "$REPO_DB_FILE"
			;;
		esac
	fi
}

add()
{
	if [[ ! -f $1 ]]; then
		error "$(gettext "File '%s' not found.")" "$1"
		return 1
	fi

	if [[ ${1##*.} == "delta" ]]; then
		deltafile=$1
		msg "$(gettext "Adding delta '%s'")" "$deltafile"
		if ! type xdelta3 &>/dev/null; then
			error "$(gettext "Cannot find the xdelta3 binary! Is xdelta3 installed?")"
			exit 1
		fi
		if db_write_delta "$deltafile"; then
			return 0
		else
			return 1
		fi
	fi

	pkgfile=$1
	if ! bsdtar -tqf "$pkgfile" .PKGINFO >/dev/null 2>&1; then
		error "$(gettext "'%s' is not a package file, skipping")" "$pkgfile"
		return 1
	fi

	msg "$(gettext "Adding package '%s'")" "$pkgfile"

	db_write_entry "$pkgfile"
}

remove()
{
	if [[ ${1##*.} == "delta" ]]; then
		deltafile=$1
		msg "$(gettext "Searching for delta '%s'...")" "$deltafile"
		if db_remove_delta "$deltafile"; then
			return 0
		else
			error "$(gettext "Delta matching '%s' not found.")" "$deltafile"
			return 1
		fi
	fi

	pkgname=$1
	msg "$(gettext "Searching for package '%s'...")" "$pkgname"

	if db_remove_entry "$pkgname"; then
		rm -f "$tmpdir/$pkgname.deltas"
		return 0
	else
		error "$(gettext "Package matching '%s' not found.")" "$pkgname"
		return 1
	fi
}

trap_exit()
{
	echo
	error "$@"
	exit 1
}

clean_up() {
	local exit_code=$?

	[[ -d $tmpdir ]] && rm -rf "$tmpdir"
	(( CLEAN_LOCK )) && [[ -f $LOCKFILE ]] && rm -f "$LOCKFILE"

	exit $exit_code
}

# PROGRAM START

# determine whether we have gettext; make it a no-op if we do not
if ! type gettext &>/dev/null; then
	gettext() {
		echo "$@"
	}
fi

case "$1" in
	-h|--help) usage; exit 0;;
	-V|--version) version; exit 0;;
esac

# figure out what program we are
cmd="$(basename $0)"
if [[ $cmd != "repo-add" && $cmd != "repo-remove" ]]; then
	error "$(gettext "Invalid command name '%s' specified.")" "$cmd"
	exit 1
fi

tmpdir=$(mktemp -d /tmp/repo-tools.XXXXXXXXXX) || (\
	error "$(gettext "Cannot create temp directory for database building.")"; \
	exit 1)

trap 'clean_up' EXIT
trap 'trap_exit "$(gettext "TERM signal caught. Exiting...")"' TERM HUP QUIT
trap 'trap_exit "$(gettext "Aborted by user! Exiting...")"' INT
trap 'trap_exit "$(gettext "An unknown error has occured. Exiting...")"' ERR

success=0
# parse arguments
for arg in "$@"; do
	case "$arg" in
		-q|--quiet) QUIET=1;;
		-d|--delta) DELTA=1;;
		-f|--files) WITHFILES=1;;
		*)
			if [[ -z $REPO_DB_FILE ]]; then
				REPO_DB_FILE="$arg"
				LOCKFILE="$REPO_DB_FILE.lck"
				check_repo_db
			else
				case "$cmd" in
					repo-add) add $arg && success=1 ;;
					repo-remove) remove $arg && success=1 ;;
				esac
			fi
			;;
	esac
done

# if at least one operation was a success, re-zip database
if (( success )); then
	msg "$(gettext "Creating updated database file '%s'")" "$REPO_DB_FILE"

	case "$REPO_DB_FILE" in
		*tar.gz)  TAR_OPT="z" ;;
		*tar.bz2) TAR_OPT="j" ;;
		*tar.xz)  TAR_OPT="J" ;;
		*) warning "$(gettext "'%s' does not have a valid archive extension.")" \
		"$REPO_DB_FILE" ;;
	esac

	filename=$(basename "$REPO_DB_FILE")

	pushd "$tmpdir" >/dev/null
	if [[ -n $(ls) ]]; then
		bsdtar -c${TAR_OPT}f "$filename" *
	else
		# we have no packages remaining? zip up some emptyness
		warning "$(gettext "No packages remain, creating empty database.")"
		bsdtar -c${TAR_OPT}f "$filename" -T /dev/null
	fi
	popd >/dev/null

	[[ -f $REPO_DB_FILE ]] && mv -f "$REPO_DB_FILE" "${REPO_DB_FILE}.old"
	[[ -f $tmpdir/$filename ]] && mv "$tmpdir/$filename" "$REPO_DB_FILE"
	dblink="${REPO_DB_FILE%.tar.*}"
	target=${REPO_DB_FILE##*/}
	ln -sf "$target" "$dblink" 2>/dev/null || \
		ln -f "$target" "$dblink" 2>/dev/null || \
		cp "$REPO_DB_FILE" "$dblink"
else
	msg "$(gettext "No packages modified, nothing to do.")"
	exit 1
fi

exit 0
# vim: set ts=2 sw=2 noet: