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#!/bin/bash
# xgensum [-f] [-i] TEMPLATE - update SHA256 sums in templates

case "$1" in
	-f) FLAG_f=$1; shift
esac

case "$1" in
	-c) FLAG_c=$1; shift
esac

case "$1" in
	-i*) FLAG_i=$1; shift
esac

XBPS_DISTDIR=$(xdistdir)

if [ -f "$1" ]; then
	template="$1"
elif [ -f "$1/template" ]; then
	template="$1/template"
elif [ -f "$XBPS_DISTDIR/srcpkgs/$1/template" ]; then
	template="$XBPS_DISTDIR/srcpkgs/$1/template"
else
	echo 'Usage: xgensum [-f] [-c] [-i] TEMPLATE' 1>&2
	exit 1
fi

. "$template"

XBPS_SRCDISTDIR=$($XBPS_DISTDIR/xbps-src show-var XBPS_SRCDISTDIR | tail -1)
srcdir="$XBPS_SRCDISTDIR/$pkgname-$version"

if [ "$FLAG_f" = -f ]; then
	for f in $distfiles; do
		curfile=$(basename "${f#*>}")
		distfile="$srcdir/$curfile"
		rm -vf "$distfile"
	done
	$XBPS_DISTDIR/xbps-src -I clean $pkgname
fi

$XBPS_DISTDIR/xbps-src -I fetch $pkgname

sums=""
for f in $distfiles; do
	curfile=$(basename "${f#*>}")
	distfile="$srcdir/$curfile"
	if [ "$FLAG_c" = -c ];then
		sum="@"
		case ${distfile} in
		*tar.lzma|*.tar|*.txz|*.tar.xz|*.tbz|*.tar.gz)
			sum+=$(tar xf "$distfile" --to-stdout | sha256sum | awk '{print $1}')
			;;
		*.gz)
			sum+=$(gunzip -c "$distfile" | sha256sum | awk '{print $1}')
			;;
		*.tar.bz2|*.bz2)
			sum+=$(bunzip2 -c "$distfile" | sha256sum | awk '{print $1}')
			;;
		*.zip)
			if command -v unzip &>/dev/null; then
				sum+=$(unzip -p "$distfile" | sha256sum | awk '{print $1}')
				if [ $? -ne 0 ]; then
					echo "$pkgver: extracting $curfile to pipe.\n"
				fi
			else
				echo "$pkgver: cannot find unzip bin for extraction.\n"
			fi
			;;
		*.rpm)
			if command -v rpmextract &>/dev/null; then
				sum+=$(rpm2cpio "$distfile" | bsdtar xf - --to-stdout | sha256sum | awk '{print $1}')
				if [ $? -ne 0 ]; then
					echo "$pkgver: extracting $curfile to pipe.\n"
				fi
			else
				echo "$pkgver: cannot find rpmextract for extraction.\n"
			fi
			;;
		*.7z)
			if command -v 7z &>/dev/null; then
				sum+=$(7z x -o "$distfile" | sha256sum | awk '{print $1}')
				if [ $? -ne 0 ]; then
					echo "$pkgver: extracting $curfile to pipe.\n"
				fi
			else
				echo "$pkgver: cannot find 7z bin for extraction.\n"
			fi
			;;
		*.txt|*.patch|*.diff)
			sum+=$(cat "$distfile" | sha256sum | awk '{print $1}')
			;;
		*)
			sum=$(sha256sum $distfile)

		esac
	else
		sum=$(sha256sum $distfile)
	fi
	sums+="${sum%  *}\n "
done

sed $FLAG_i -e "/^checksum=/,/^[^ \t]/{
		/^[ \t]/d
		s/^checksum=.*/checksum=\"${sums%\n }\"/
		/^checksum=\"[^ ]*\"/s/\"//g
	}" "$template"