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

usage() {
	echo 'Usage: xgensum [-f] [-c] [-i] [-H hostdir] TEMPLATE' >&2
	exit 1
}

while getopts fciH:h flag; do
	case $flag in
		f) FLAG_f=1 ;;
		c) FLAG_c=1 ;;
		i) FLAG_i='-i' ;;
		H) FLAG_h="-H $OPTARG" ;;
		h|?) usage ;;
	esac
done

shift $(( OPTIND - 1 ))

XBPS_DISTDIR=$(xdistdir) || exit 1

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
	usage
fi

. "$template"

# pick the first supported arch. This is required for packages unavailable for
# the host arch
FLAG_a=
if ! "$XBPS_DISTDIR/xbps-src" show-avail $pkgname ; then
	FLAG_a="-a $("$XBPS_DISTDIR/xbps-src" show $pkgname | sed -En -e 's/archs:[[:space:]]*([.*]*)/\1/p' | sed -e 's/\*$//' | grep -v -e '^~' | head -n1 )"
fi

# Try to source the build-style as well. This is required for R-cran packages.
if [ -f "${XBPS_DISTDIR}/common/environment/build-style/${build_style}.sh"  ]; then
	. "${XBPS_DISTDIR}/common/environment/build-style/${build_style}.sh"
fi

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

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

"$XBPS_DISTDIR/xbps-src" $FLAG_h $FLAG_a -I fetch $pkgname

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

		esac
	else
		sum=$(xbps-uhelper digest $distfile) || ret=1
	fi
	sums+="${sum%  *}\n "
done

sed $FLAG_i -e "/^checksum=/,/^[^ \t]/{
		/^[ \t]/d
		s/^checksum=.*/checksum=\"${sums%\n }\"/
		/^checksum=\"[^ ]*\"/s/\"//g
	}" "$template" || ret=1

exit $ret