#!/bin/bash
#
# 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; version 2 of the License.
#
# 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.

version=@version@

LIBDIR='@libdir@'

[[ -r ${LIBDIR}/util-msg.sh ]] && source ${LIBDIR}/util-msg.sh

import ${LIBDIR}/util-pkg.sh

shopt -s extglob

load_user_info

load_vars "${PAC_USERCONFDIR}/makepkg.conf" || load_vars "$USER_HOME/.makepkg.conf"
load_vars /etc/makepkg.conf

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

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

STARTDIR=$(pwd)
TEMPDIR=$(mktemp -d --tmpdir checkpkg-script.XXXX)

for _pkgname in "${pkgname[@]}"; do
    target_pkgver=$(get_full_version "$_pkgname")
    if ! pkgfile=$(find_cached_package "$_pkgname" "$target_pkgver" "$CARCH"); then
        die 'tarball not found for package: %s' "${_pkgname}-$target_pkgver"
    fi

    ln -s "$pkgfile" "$TEMPDIR"

    pkgurl=$(pacman -Spdd --print-format '%l' --noconfirm "$_pkgname")

    if [[ $? -ne 0 ]]; then
        die "Couldn't download previous package for %s." "$_pkgname"
    fi

    oldpkg=${pkgurl##*://*/}

    if [[ ${oldpkg##*/} = ${pkgfile##*/} ]]; then
        die "The built package (%s) is the one in the repo right now!" "$_pkgname"
    fi

    if [[ $pkgurl = file://* ]]; then
        ln -s "${pkgurl#file://}" "$TEMPDIR/$oldpkg"
    elif [[ -f "$PKGDEST/$oldpkg" ]]; then
        ln -s "$PKGDEST/$oldpkg" "$TEMPDIR/$oldpkg"
    elif [[ -f "$STARTDIR/$oldpkg" ]]; then
        ln -s "$STARTDIR/$oldpkg" "$TEMPDIR/$oldpkg"
    else
        curl -fsLC - --retry 3 --retry-delay 3 -o "$TEMPDIR/$oldpkg" "$pkgurl"
    fi

    bsdtar tf "$TEMPDIR/$oldpkg" | sort > "$TEMPDIR/filelist-$_pkgname-old"
    bsdtar tf "$pkgfile" | sort > "$TEMPDIR/filelist-$_pkgname"

    sdiff -s "$TEMPDIR/filelist-$_pkgname-old" "$TEMPDIR/filelist-$_pkgname"

    find-libprovides "$TEMPDIR/$oldpkg" 2>/dev/null | sort > "$TEMPDIR/libraries-$_pkgname-old"
    find-libprovides "$pkgfile" 2>/dev/null | sort > "$TEMPDIR/libraries-$_pkgname"
    if ! diff_output="$(sdiff -s "$TEMPDIR/libraries-$_pkgname-old" "$TEMPDIR/libraries-$_pkgname")"; then
        msg "Sonames differ in %s!" "$_pkgname"
        echo "$diff_output"
    else
        msg "No soname differences for %s" "$_pkgname."
    fi
done