#!/bin/bash

# Source makepkg.conf; fail if it is not found
if [ -r '/etc/makepkg.conf' ]; then
	source '/etc/makepkg.conf'
else
	echo '/etc/makepkg.conf not found!'
	exit 1
fi

# Source user-specific makepkg.conf overrides
if [ -r ~/.makepkg.conf ]; then
	source ~/.makepkg.conf
fi

strip_url() {
	echo $1 | sed 's|^.*://.*/||g'
}

if [ ! -f PKGBUILD ]; then
	echo 'This must be run in the directory of a built package.'
	exit 1
fi

. PKGBUILD
if [ "$arch" == 'any' ]; then
	CARCH='any'
fi

STARTDIR=$(pwd)
TEMPDIR=$(mktemp -d /tmp/checkpkg-script.XXXX)
cd $TEMPDIR

for _pkgname in ${pkgname[@]}; do
	pkgfile=${_pkgname}-${pkgver}-${pkgrel}-${CARCH}${PKGEXT}
	oldstylepkgfile=${_pkgname}-${pkgver}-${pkgrel}${PKGEXT}

	if [ -f "$STARTDIR/$pkgfile" ]; then
		cp "$STARTDIR/$pkgfile" .
	elif [ -f "$PKGDEST/$pkgfile" ]; then
		cp "$PKGDEST/$pkgfile" .
	elif [ -f "$STARTDIR/$oldstylepkgfile" ]; then
		cp "$STARTDIR/$oldstylepkgfile" .
	elif [ -f "$PKGDEST/$oldstylepkgfile" ]; then
		cp "$PKGDEST/$oldstylepkgfile" .
	else
		echo "File \"$pkgfile\" doesn't exist"
		exit 1
	fi

	tmp=`pacman -Spd --noconfirm $_pkgname`

	if [ $? -ne 0 ]; then
		echo "Couldn't download previous package for $_pkgname."
		exit 1
	fi

	pkgurl=`echo $tmp | rev | cut -d ' ' -f 1 | rev`

	oldpkg=`strip_url $pkgurl`

	if [ "$(basename $oldpkg)" = "$(basename $pkgfile)" ]; then
		echo "The built package ($_pkgname) is the one in the repo right now!"
		exit 1
	fi

	if [ ! -f $oldpkg ]; then
		if echo $pkgurl | grep '^file:///' > /dev/null 2>&1; then
			cp `echo $pkgurl | sed 's#^file://##'` .
		elif [ -f $PKGDEST/$oldpkg ]; then
			cp $PKGDEST/$oldpkg .
		else
			wget --quiet $pkgurl
		fi
	fi

	bsdtar tf $oldpkg > filelist-$_pkgname-old
	bsdtar tf "$pkgfile" > filelist-$_pkgname

	sort -o filelist-$_pkgname filelist-$_pkgname
	sort -o filelist-$_pkgname-old filelist-$_pkgname-old

	diff -u filelist-$_pkgname-old filelist-$_pkgname

	if diff filelist-$_pkgname-old filelist-$_pkgname | grep '\.so' > /dev/null 2>&1; then
		mkdir -p pkg
		cd pkg
		bsdtar xf ../"$pkgfile" > /dev/null
		for i in `diff ../filelist-$_pkgname-old ../filelist-$_pkgname | grep \> | grep \.so | awk '{print $2}'`; do
			echo -n "${i}: "
			objdump -p $i | grep SONAME
		done
	else
		echo "No soname differences for $_pkgname."
	fi
done

echo "Files saved to $TEMPDIR"