#!/bin/sh
#
#  scratchpkg
#
#  Copyright (c) 2018 by Emmett1  (emmett1.2miligrams@gmail.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 3 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 <https://www.gnu.org/licenses/>.
#

interrupted() {
	cleanup
	echo
	exit 1
}

cleanup() {
	rm -f $FILE_LIST
}

usage() {
	cat << EOF
Usage:
  $(basename $0) [option] [arg]
  
Options:
  -a, --all                         print all affected files
  -r, --rebuild                     rebuild & reinstall broken package
  -p, --package <pkg>               check for certain package
  -f, --no-filter                   skip filter (exclude) dirs, files and libraries
  -e, --exclude <pkg1 pkg2 pkgN>    exclude package when rebuild (use with -r/--rebuild)
  -y, --yes                         dont ask user confirmation to rebuild package (use with -r/--rebuild)
  -h, --help                        print this help message

EOF
}

confirm() {
	printf "$1 (Y/n) "
	read -r response
	case "$response" in
		[Nn][Oo]|[Nn]) echo "$2"; exit 2 ;;
		*) : ;;
	esac
}

extract_opts() {
	while [ "$1" ]; do
		case $1 in
			--*) opts="$opts $1";;
			-*) char=${#1}; count=1
			    while [ "$count" != "$char" ]; do
					count=$((count+1))
					opts="$opts -$(echo $1 | cut -c $count)"
				done;;
			*) opts="$opts $1"
		esac
		shift
	done
	echo $opts
}

parse_opt() {
	while [ $1 ]; do
		case $1 in
			-a|--all)       PRINTALL=1 ;;
			-r|--rebuild)   REBUILD=1 ;;
			-y|--yes)       NOCONFIRM=1 ;;
			-f|--no-filter) NO_FILTER=1 ;;
			-e|--exclude)	while [ "$2" ]; do
								case $2 in
									-*) break ;;
									*) [ -z "$expkg" ] && expkg="$2" || expkg="$expkg $2"
								esac
								shift
							done ;;
			-p|--package)   PKG=$2; shift ;;
			-h|--help)		usage; exit 0 ;;
			*)				echo "Invalid option ($1)"; exit 1 ;;
		esac
		shift
	done
}

rebuild() {	
	for allpkg in $(scratch deplist $ALLPKG | awk '{print $2}'); do
		for pkg in $ALLPKG; do
			if [ $pkg = $allpkg ]; then
				if [ -z "$order" ]; then
					order="$allpkg"
				else
					order="$order $allpkg"
				fi
				break
			fi
		done
	done
	if [ -n "$order" ]; then
		if [ "$NOCONFIRM" = "" ]; then
			echo
			echo "Package will be rebuild & reinstall by this order:"
			echo " $order"
			echo
			confirm "Continue rebuild & reinstall broken packages?" "Operation cancelled."
		fi
		for p in $order; do
			scratch build -f $p   || { cleanup; exit 1; }
			scratch install -r $p || { cleanup; exit 1; }
		done
	fi
}

rev_exclude() {
	# excluded dirs
	EXCLUDE_DIRS="$(grep -v ^# /etc/revdep.conf 2>/dev/null | grep /$ | uniq | sed 's/\/*$//g')"
	EXCLUDE_DIRS="$EXCLUDE_DIRS $(grep -v ^# /etc/revdep.d/*.conf 2>/dev/null | cut -d : -f2 | grep /$ | uniq | sed 's/\/*$//g')"

	for dd in $EXCLUDE_DIRS; do
		if [ -d $dd ]; then
			_DIRS="$_DIRS $dd"
			ged="$ged -e ^$dd"
		fi
	done

	EXCLUDE_DIRS=$(echo $_DIRS | tr ' ' '\n' | sort | uniq)

	for d in $EXCLUDE_DIRS; do
		EXCLUDED_DIRS="$EXCLUDED_DIRS -path $d -prune -o "
	done

	# excluded files
	EXCLUDE_FILES="$(grep -v ^# /etc/revdep.conf 2>/dev/null | grep -v /$ | grep ^/)"
	EXCLUDE_FILES="$EXCLUDE_FILES $(grep -v ^# /etc/revdep.d/*.conf 2>/dev/null | cut -d : -f2 | grep -v /$ | grep ^/)"

	for ff in $EXCLUDE_FILES; do
		if [ -f $ff ]; then
			_FILES="$_FILES $ff"
			gef="$gef -e ^$ff$"
		fi
	done

	EXCLUDE_FILES=$(echo $_FILES | tr ' ' '\n' | sort | uniq)

	for f in $EXCLUDE_FILES; do
		EXCLUDED_FILES="$EXCLUDED_FILES ! -path $f "
	done

	# excluded libraries
	EXCLUDE_LIBS="$(grep -v ^# /etc/revdep.conf 2>/dev/null | grep -v ^/ | uniq | grep ".*.so.*")"
	EXCLUDE_LIBS="$EXCLUDE_LIBS $(grep -v ^# /etc/revdep.d/*.conf 2>/dev/null  | cut -d : -f2 | grep -v ^/ | uniq | grep ".*.so.*")"

	EXCLUDED_LIBS=$(echo $EXCLUDE_LIBS | tr ' ' '\n' | sort | uniq)
}

trap "interrupted" 1 2 3 15

command -v pkgadd >/dev/null 2>&1 || {
	echo "'pkgadd' not found in \$PATH!"
	exit 1
}

# package database directory
PKGDB_DIR="$(pkgadd --print-dbdir)"
SEARCH_DIRS="/bin /usr/bin /sbin /usr/sbin /lib /usr/lib /lib64 /usr/lib64 /usr/libexec"

parse_opt $(extract_opts "$@")

if [ "$(id -u)" != 0 ] && [ "$REBUILD" = 1 ]; then
	echo "$(basename $0) need to run as root to rebuild & reinstall package"
	exit 1
fi

if [ "$PKG" ] && [ ! -f "$PKGDB_DIR/$PKG/.files" ]; then
	echo "ERROR: Package '$PKG' not installed"
	cleanup
	exit 1
fi

# get search extra dirs
while read -r line; do
	if [ "$(echo $line | cut -c 1)" = "/" ]; then
		EXTRA_SEARCH_DIRS="$EXTRA_SEARCH_DIRS $line "
	fi
done < /etc/ld.so.conf

if [ -d /etc/ld.so.conf.d/ ]; then
	for dir in /etc/ld.so.conf.d/*.conf; do
		while read -r line; do
			if [ "$(echo $line | cut -c 1)" = "/" ]; then
				EXTRA_SEARCH_DIRS="$EXTRA_SEARCH_DIRS $line "
			fi
		done < $dir
	done
fi

if [ "$NO_FILTER" != 1 ]; then
	rev_exclude
fi

# search dirs
TARGET_SEARCH_DIRS="$SEARCH_DIRS $EXTRA_SEARCH_DIRS"

FILE_LIST="/tmp/.revdep.$$"

echo "SEARCH DIRS:"
for d in $TARGET_SEARCH_DIRS; do
	if [ -d $d ]; then
		SEARCH_DIRS="$SEARCH_DIRS $d"
		echo " $d"
	fi
done
echo

echo "EXCLUDED DIRS:"
for dd in $EXCLUDE_DIRS; do
	echo " $dd"
done
echo

echo "EXCLUDED FILES:"
for ff in $EXCLUDE_FILES; do
	echo " $ff"
done
echo

echo "EXCLUDED LIBS:"
for ll in $EXCLUDED_LIBS; do
	echo " $ll"
done
echo

if [ "$PKG" ]; then
	for D in $TARGET_SEARCH_DIRS; do
		gx="$gx -e ^$D"
	done
	gx="$gx -e *\.so -e *\.so\.*"
	if [ -n "$gef" ]; then
		filterfile="grep -v $gef"
	else
		filterfile=cat
	fi
	if [ -n "$ged" ]; then
		filterdir="grep -v $ged"
	else
		filterdir=cat
	fi
	printf "Find '$PKG' files... "
	sed 's/^/\//' $PKGDB_DIR/$PKG/.files | grep $gx | $filterfile | $filterdir > $FILE_LIST
else
	printf "Find all files... "
	find $SEARCH_DIRS $EXCLUDED_DIRS $EXCLUDED_FILES -type f \( -perm /+u+x -o -name '*.so' -o -name '*.so.*' \) -print 2> /dev/null | sort -u > $FILE_LIST
fi

total=$(wc -l $FILE_LIST | awk '{print $1}')
count=0

echo "$total files found"

echo "Checking for broken linkage..."

while read -r line; do
	count=$(( count + 1 ))
	libname=$(basename "$line")
	printf " $(( 100*count/total ))%% $libname\033[0K\r"
	case "$(file -bi "$line")" in
		*application/x-sharedlib* | *application/x-executable* | *application/x-pie-executable*)
			if ldd $line 2>/dev/null | grep -q "not found"; then
				LIB_NAME=$(ldd $line 2>/dev/null | grep "not found" | sort | uniq | awk '{print $1}')
				for l in $LIB_NAME; do
					if ! echo $EXCLUDED_LIBS | grep -qw $l; then
						NEW_LIB_NAME="$NEW_LIB_NAME $l"
					fi
				done
				LIB_NAME=$NEW_LIB_NAME
				[ "$LIB_NAME" ] || continue
				PKG_NAME=$(echo $line | sed 's#^/##')
				PKG_NAME=$(grep -Rx $PKG_NAME "$PKGDB_DIR"/*/.files | cut -d : -f1)
				[ "$PKG_NAME" ] || continue
				PKG_NAME=$(dirname $PKG_NAME)
				PKG_NAME=$(basename $PKG_NAME)
				echo $expkg | tr ' ' '\n' | grep -qx $PKG_NAME && continue
				REQ_LIB=$(objdump -p $line 2>/dev/null | grep NEEDED | awk '{print $2}' | tr '\n' ' ')
				for i in $LIB_NAME; do
					[ "$PRINTALL" = 1 ] && echo " $PKG_NAME -> $line (requires $i)"
					if echo $REQ_LIB | tr ' ' '\n' | grep -qx $i; then
						[ "$PRINTALL" = 1 ] || echo " $PKG_NAME -> $line (requires $i)"
						if echo "$ALLPKG" | tr ' ' '\n' | grep -qx "$PKG_NAME"; then
							continue
						else
							ALLPKG="$ALLPKG $PKG_NAME"
						fi
					fi
				done
			fi
			;;
	esac
	unset NEW_LIB_NAME
done < $FILE_LIST

printf "\033[0K"
	
if [ "$ALLPKG" ]; then
	echo
	echo "Broken package(s):"
	for rebuild in $ALLPKG; do
		echo " $rebuild"
	done
	if [ "$REBUILD" = 1 ]; then
		rebuild
	fi
else
	echo "All packages is doing fine."
fi

cleanup

exit 0