#!/bin/bash
#
#  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/>.
#

RED='\e[0;31m'
GREEN='\e[0;32m'
YELLOW='\e[0;33m'
CYAN='\e[0;36m'
CRESET='\e[0m'

trap "interrupted" SIGHUP SIGINT SIGQUIT SIGTERM

interrupted() {
	echo
	ret 1
}

nocolor() {
	RED=
	GREEN=
	YELLOW=
	CYAN=
	CRESET=
}

msg() {
	echo -e "${GREEN}==>${CRESET} $1"
}

msg2() {
	echo -e " ${CYAN}*${CRESET} $1"
}

msgerr() {
	echo -e "${RED}==> ERROR:${CRESET} $1"
}

msgwarn() {
	echo -e "${YELLOW}==> WARNING:${CRESET} $1"
}

runhooks() {
	
	if [ "$UPGRADE_PKG" ]; then
		opr=upgrade
	else
		opr=install
	fi
	
	for hook in $HOOK_DIR/*.hook; do
		[ -f $hook ] || continue
		description=$(grep "^# description[[:blank:]]*:" $hook | sed 's/^# description[[:blank:]]*:[[:blank:]]*//')
		operation=$(grep "^# operation[[:blank:]]*:" $hook | sed 's/^# operation[[:blank:]]*:[[:blank:]]*//')
		target=$(grep "^# target[[:blank:]]*:" $hook | sed 's/^# target[[:blank:]]*:[[:blank:]]*//')
		if [ -n "$description" ] && [ -n "$operation" ] && [ -n "$target" ]; then
			if [ "$(echo $operation | grep -w "$opr" )" ]; then
				if [ "$(grep $target $INDEX_DIR/$name/.files)" ]; then
					[ "$SILENT_INSTALL" ] || msg2 "$description"
					. $hook
					if [ "`type -t exechook`" = "function" ]; then
						exechook
					fi
				fi
			fi
		fi
		unset description operation target
		unset -f exechook
	done
	
}

help() {	
	cat << EOF
Usage:
  $(basename $0) package.spkg.txz <options>

Options:
  -u, --upgrade              upgrade package
  -r, --reinstall            reinstall package
  -c, --ignore-conflict      ignore conflict when installing package
  -v, --verbose              print files installed
  -s, --silent               print install message in simple format
  -h, --help                 show this help message
      --no-preinstall        skip preinstall script before build/install package
      --no-postinstall       skip postinstall script after install package
      --no-preupgrade        skip preupgrade script before upgrade package
      --no-postupgrade       skip postupgrade script after upgrade package
      --no-backup            skip backup when upgrading package
      --no-color             disable colour for output
      --no-hook              skip executing hook
      --root=<path>          install to custom root directory

Example:
  $(basename $0) foobar-1.0-1.spkg.txz -uc --no-backup       upgrade package foobar-1.0-1 without backup its 
                                                         old configuration files and skip conflict check
EOF
}

extract_opt() {
	for opt in $@; do
		case $opt in
			  --*) OPTS+=($opt) ;;
			   -*) for (( i=1; i<${#opt}; i++ )); do OPTS+=(-${opt:$i:1}); done ;;
			    *) OPTS+=($opt) ;;
		esac
	done
	echo ${OPTS[@]}
}

parse_opts() {
	if [ -z "$1" ]; then
		SHOWHELP=yes
	else
		while [ "$1" ]; do
			case $1 in
			-u |           --upgrade) UPGRADE_PKG=yes ;;
			-r |         --reinstall) REINSTALL_PKG=yes ;;
			-c |   --ignore-conflict) IGNORE_CONFLICT=yes ;;
			-v |           --verbose) VERBOSE_INSTALL=yes ;;
			-s |            --silent) SILENT_INSTALL=yes ;;
			-h |              --help) SHOWHELP=yes ;;
			         --no-preinstall) NO_PREINSTALL=yes ;;
			        --no-postinstall) NO_POSTINSTALL=yes ;;
			  	     --no-preupgrade) NO_PREUPGRADE=yes ;;
				    --no-postupgrade) NO_POSTUPGRADE=yes ;;
				         --no-backup) NO_BACKUP=yes ;;
			   		      --no-color) NOCOLOR=yes ;;
			   		       --no-hook) NOHOOK=yes ;;
		                    --root=*) ROOT="${1#*=}" ;;
					      *.spkg.txz) PKGNAME="$1" ;;
					               *) msg "Invalid option! ($1)"; exit 1 ;;
			esac
			shift
		done
	fi
}

ret() {
	# remove lock file on exit
	rm -fr $LOCK_FILE $TMP_PKGADD
	exit $1
}

isinstalled() {
	if [ -s $INDEX_DIR/$1/.pkginfo ] && [[ $(grep $1 $INDEX_DIR/$1/.pkginfo) ]]; then
		return 0
	else
		return 1
	fi
}

parse_opts $(extract_opt $@)

INDEX_DIR="$ROOT/var/lib/scratchpkg/index"
PKGADD_DIR="$ROOT/var/lib/scratchpkg"
TMP_PKGADD="$PKGADD_DIR/$(basename $0)-tmp"
LOCK_FILE="$PKGADD_DIR/spkg.lock"
TMP_PKGINSTALL="$TMP_PKGADD/$(basename $0).install"
TMP_PKGINSTALL_BKP="$TMP_PKGADD/$(basename $0).bkp.install"
HOOK_DIR=/etc/hooks

# show help page
if [ "$SHOWHELP" ] || [ -z "$PKGNAME" ]; then
	help
	ret 0
fi
	
# disable color for output
if [ "$NOCOLOR" ]; then
	nocolor
fi

mkdir -p $PKGADD_DIR 

# check for lock file
if [ -f $LOCK_FILE ]; then
	msgerr "Cant install/remove package simultaneously."
	msgerr "remove '$LOCK_FILE' if no install/remove package process running."
	exit 1
else
	touch $LOCK_FILE
	if [ "$?" != 0 ]; then
		msgerr "Cant create lock file in '$LOCK_FILE'"
		exit 1
	fi
fi

mkdir -p $INDEX_DIR $TMP_PKGADD

if [ -n "$PKGNAME" ]; then
	BASEPKGNAME=$(basename $PKGNAME)
fi

# check existence of package file
if [ ! -f "$PKGNAME" ]; then
	msgerr "Package '$1' not exist!"
	ret 1
fi

# check for root access
if [ "$UID" != "0" ]; then
	msgerr "Installing package need root access!"
	ret 1
fi

name=$(echo $BASEPKGNAME | sed 's/.spkg.txz//' | rev | cut -d - -f 3- | rev)
version=$(echo $BASEPKGNAME | sed 's/.spkg.txz//' | rev | cut -d - -f 2 | rev)
release=$(echo $BASEPKGNAME | sed 's/.spkg.txz//' | rev | cut -d - -f 1 | rev)
		
# get package information if installed
if isinstalled $name; then
	iname=$(cat $INDEX_DIR/$name/.pkginfo | grep ^name | cut -d " " -f3-)
	iversion=$(cat $INDEX_DIR/$name/.pkginfo | grep ^version | cut -d " " -f3-)
	irelease=$(cat $INDEX_DIR/$name/.pkginfo | grep ^release | cut -d " " -f3-)
	ALREADYINSTALLED=yes
fi

if [ "$ALREADYINSTALLED" = "yes" ] && [ ! "$UPGRADE_PKG" ] && [ ! "$REINSTALL_PKG" ]; then
	msg "Package '$name' already installed. ($iversion-$irelease)"
	ret 0
fi

echo -ne "Loading $BASEPKGNAME...\033[0K\r"

# check integrity of package
tar -tf $PKGNAME > $TMP_PKGADD/files 2>/dev/null
if [ $? != 0 ]; then
	msgerr "Package '$1' is corrupted!"
	ret 1
fi
echo -ne "\033[0K"

# cant reinstall if not installed and cant upgrade if up-to-date
if [ "$UPGRADE_PKG" ] || [ "$REINSTALL_PKG" ]; then	
	if [ "$ALREADYINSTALLED" != "yes" ]; then
		msgerr "Package '$name' not installed."
		ret 1
	fi
	if [ "$UPGRADE_PKG" ]; then	
		if [ "$version-$release" = "$iversion-$irelease" ]; then
			msg "Package '$name' is up-to-date. ($iversion-$irelease)"
			ret 0
		fi
	fi
fi

### INSTALL PACKAGE INTO SYSTEM ###
opr=Installing; oprdone=installed
[ "$UPGRADE_PKG" ] && { opr=Upgrading; oprdone=upgraded; }
[ "$REINSTALL_PKG" ] && { opr=Reinstalling; oprdone=reinstalled; }
[ "$SILENT_INSTALL" ] || msg "$opr '$name-$version-$release'..."

#ignore conflict
if [ ! "$IGNORE_CONFLICT" ]; then
	[ "$SILENT_INSTALL" ] || msg2 "Checking file conflict..."
	while IFS=' ' read -r line; do
			if [ "$line" = "${line%.*}.spkgnew" ]; then
				line=${line%.*}
			fi
			if [ -e "$ROOT/$line" ]; then
				if [ "$UPGRADE_PKG" ] || [ "$REINSTALL_PKG" ]; then
					if [ ! "$(grep -Fx "$line" "$INDEX_DIR/$name/.files")" ]; then
						fileconflict+=(${line})
					fi
				else
					fileconflict+=(${line})
				fi
			fi
	done < <(cat $TMP_PKGADD/files | grep -Ev '(.pkginfo|.pkginstall|.pkgreadme)' | grep -v '/$')
		
	if [ "${#fileconflict[@]}" -gt 0 ]; then
		[ "$SILENT_INSTALL" ] && echo
		msgerr "File conflict found:"
		for fc in ${fileconflict[@]}; do
			msg2 "$fc"
		done
		ret 1
	fi
fi

if [ $(grep -x .pkginstall $TMP_PKGADD/files) ]; then
	source <(tar -xf "$PKGNAME" .pkginstall -O)
fi

# run preinstall script if no --no-preinstall flag and not upgrade package
( cd $ROOT/
	if [ ! "$NO_PREINSTALL" ] && [ ! "$UPGRADE_PKG" ]; then
		if [ "`type -t pre_install`" = "function" ]; then
			[ "$SILENT_INSTALL" ] || msg2 "Running preinstall script..."
			pre_install "$version" &>/dev/null
		fi
	fi
)

# run preupgrade script if package upgrade
( cd $ROOT/
	if [ "$UPGRADE_PKG" ] && [ ! "$NO_PREUPGRADE" ]; then
		if [ "`type -t pre_upgrade`" = "function" ]; then
			[ "$SILENT_INSTALL" ] || msg2 "Running preupgrade script..."
			pre_upgrade "$version" "$iversion" &>/dev/null
		fi
	fi
)

#installing package into system
total=$(cat $TMP_PKGADD/files | grep -Ev '(.pkginfo|.pkginstall|.pkgreadme)' | wc -l)
count=0

[ "$SILENT_INSTALL" ] || msg2 "Extracting package..."
installcmd="tar --keep-directory-symlink -p -x -v -f $PKGNAME -C ${ROOT:-/} --exclude=.pkginfo --exclude=.pkginstall --exclude=.pkgreadme"

rm -f $TMP_PKGINSTALL $TMP_PKGINSTALL_BKP
$installcmd | while IFS=' ' read line; do
	count=$(( $count + 1 ))
	[ "$SILENT_INSTALL" ] && echo -ne "$opr $name-$version-$release [ $(( 100*$count/$total ))% ]\r"
	if [ "$line" = "${line%.*}.spkgnew" ]; then
		echo "$line" >> $TMP_PKGINSTALL_BKP
		line=${line%.*}
		if [ "$UPGRADE_PKG" ] || [ "$REINSTALL_PKG" ]; then
			if [ ! -e "$ROOT/$line" ] || [ "$NO_BACKUP" = yes ]; then
				mv "$ROOT/$line".spkgnew "$ROOT/$line"
			fi
		else
			mv "$ROOT/$line".spkgnew "$ROOT/$line"
		fi
	fi
	echo "$line" >> $TMP_PKGINSTALL
done

# remove old files from old package that not exist in new package
if [ "$UPGRADE_PKG" ] || [ "$REINSTALL_PKG" ]; then
	[ "$SILENT_INSTALL" ] || msg2 "Removing old files..."
	grep -Fxv -f $TMP_PKGINSTALL $INDEX_DIR/$name/.files > $TMP_PKGADD/$name.rmlist
	grep -v '/$' $TMP_PKGADD/$name.rmlist | while IFS=' ' read line; do
		rm "$ROOT/$line" &>/dev/null
	done
	grep '/$' $TMP_PKGADD/$name.rmlist | tac | while IFS=' ' read line; do
		if [ ! "$(grep -R --exclude-dir="$name" -w "$line" "$INDEX_DIR")" ]; then
			rmdir "$ROOT/$line" &>/dev/null
		fi
	done
fi

# register package into database
rm -fr $INDEX_DIR/$name 
mkdir $INDEX_DIR/$name
echo "name = $name" > $INDEX_DIR/$name/.pkginfo
echo "version = $version" >> $INDEX_DIR/$name/.pkginfo
echo "release = $release" >> $INDEX_DIR/$name/.pkginfo
mv $TMP_PKGINSTALL $INDEX_DIR/$name/.files
[ -f $TMP_PKGINSTALL_BKP ] && mv $TMP_PKGINSTALL_BKP $INDEX_DIR/$name/.bkpfiles
tar -x -f $PKGNAME -C $INDEX_DIR/$name .pkginstall .pkgreadme >/dev/null 2>&1

( cd $ROOT/
	if [ ! "$NO_POSTINSTALL" ] && [ ! "$UPGRADE_PKG" ]; then
		if [ "`type -t post_install`" = "function" ]; then
			[ "$SILENT_INSTALL" ] || msg2 "Running postinstall script..."
			post_install "$version" &>/dev/null
		fi
	fi
)

( cd $ROOT/
	if [ "$UPGRADE_PKG" ] && [ ! "$NO_POSTUPGRADE" ]; then
		if [ "`type -t post_upgrade`" = "function" ]; then
			[ "$SILENT_INSTALL" ] || msg2 "Running postupgrade script..."
			post_upgrade "$version" "$iversion" &>/dev/null
		fi
	fi
)

if [ "$ROOT" = "" ]; then
	[ "$NOHOOK" = "yes" ] || runhooks
	[ $(type -p sysusers) ] && sysusers
fi

if [ "$SILENT_INSTALL" ]; then
	echo
else
	msg "Package '$name-$version-$release' $oprdone."
fi

# running ldconfig
if [ -x /sbin/ldconfig ]; then
	/sbin/ldconfig -r $ROOT/
fi

ret 0