mkpkg

#!/bin/sh

help() {
	echo \
"
mkpkg [options ...] [payload-dir] [pkg]

Small utility tool to make macos packages from any directory.
The package installs the files starting from the base location, conserving the file structure inside the payload directory.
does not use pkgutil/pkgbuild/productbuild/...

requirements:
	xar
	realpath
	mkbom
	lsbom

available options:

	-h, --help
		print the help and exit

	-i, --id, --identifier [name]
		set the identifier for the package
		default: package name
		
	-a, -auth [auth]
		set the required auth level.
		can be one of: none, root
		default: none

	-l, --location [path]
		set the starting path from which the files will be installed, conserving the file structure inside the payload.
		default: /
	
	--preinstall [script]
		provide a shell script which will be launched by the installer before installation.
		should not be included in the payload.

	--postinstall [script]
		provide a shell script which will be launched by the installer after installation.
		should not be included in the payload.
"
}

is_missing() {
	case "$2" in
		-* | "")
			echo "$1: missing parameter"
			exit 1
			;;
	esac
}

PARAMETERS=""

location="/"
auth="none"

while [ "$#" -gt 0 ]; do
	case "$1" in
		-h | --help)
			help
			exit 0
			;;
		-i | --id | --identifier)
			is_missing "$1" "$2"
			identifier=$2
			shift 2
			;;
		-a | --auth)
			is_missing "$1" "$2"
			if [ $2 != "none" ] && [ $2 != "root" ]; then
				echo "$1: $2: invalid parameter, please enter one of: root, none"
				exit 1
			fi
			auth=$2
			shift 2
			;;
		-l | --location)
			is_missing "$1" "$2"
			location=$2
			shift 2
			;;
		--preinstall)
			is_missing "$1" "$2"
			preinstall="$(realpath $2)"
			shift 2
			;;
		--postinstall)
			is_missing "$1" "$2"
			postinstall="$(realpath $2)"
			shift 2
			;;
		-*)
			echo "error: Unknown parameter '$1'"
			exit 1
			;;
		*)
			PARAMETERS+=" $1"
			shift
			;;
	esac
done

set -- $PARAMETERS

if [ "$#" -lt 2 ]; then
	help
	exit 1
fi

files="$1"

if [ ! -d "$files" ]; then
	echo "error: '$files' doesn't exit or is not a directory"
	exit 1
fi

tmp="/tmp/$1_pkg_tmp"
name="$(basename $2)"
if [ -z $identifier ]; then
	identifier=$name
fi
package="$(realpath $2)"

if [ -f "$package" ]; then
	while true; do
		echo "Warning: '$package' already exists. Do you wish to overwrite it? [y/n]: \c"
		read yn
		case $yn in
			Y | y)
				break;;
			N | n)
				exit;;
		esac
	done
fi
	
cd "$files"

weight=$(du -sk . | cut -f1 -w -)

rm -rf "$tmp"
mkdir "$tmp"

mkbom . "$tmp/Bom"

find ./ | cpio -o 2>/dev/null | gzip -c >"$tmp/Payload"

cd "$tmp"

if [ -n "$preinstall" ] || [ -n "$postinstall"]; then
	mkdir scripts_dir
	cp $preinstall $postinstall scripts_dir
	cd scripts_dir
	find ./* | cpio -o | gzip -c >"../Scripts"
	cd ..
	rm -rf scripts_dir
fi

nfiles=$(lsbom Bom | wc -l | cut -w -f2 -)

echo > PackageInfo \
"<pkg-info format-version=\"2\" identifier=\"$identifier\" auth=\"$auth\" version=\"1\" install-location=\"$location\">
<payload installKBytes=\"$weight\" numberOfFiles=\"$nfiles\"/>
</pkg-info>"

xar -j --no-compress "Payload" --no-compress "Scripts" -c * -f "$package"

rm -rf "$tmp"

echo "Made package '$name'"

exit 0