#!/bin/bash

# Slackware build script for snapper

# Copyright 2026 Patrick J. Verner, Waupaca, WI, USA
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
# EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

cd $(dirname $0) ; CWD=$(pwd)

PRGNAM=snapper
VERSION=${VERSION:-0.13.2}
BUILD=${BUILD:-1}
TAG=${TAG:-_pmagic}
PKGTYPE=${PKGTYPE:-txz}

ARCH=x86_64
TMP=${TMP:-/tmp/pmagic}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/build}

set -e

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf $PRGNAM-$VERSION
tar xvf $CWD/$PRGNAM-$VERSION.tar.gz
cd $PRGNAM-$VERSION
chown -R root:root .
find -L . \
 \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 -o -perm 511 \) \
 -exec chmod 755 {} \+ -o \
 \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
 -exec chmod 644 {} \+

# The release tarball ships no configure script (and no autogen.sh); snapper
# expects the tree to be bootstrapped.  autoreconf does it.
autoreconf -fi

# No systemd, no zypp, no PAM stack and no SELinux in this image, so none of
# those halves of snapper are built.  Btrfs only: the LVM and ext4 backends
# would pull tooling the image does not carry for them.
CXXFLAGS="-O2 -fPIC" \
./configure \
  --prefix=/usr \
  --libdir=/usr/lib64 \
  --sysconfdir=/etc \
  --mandir=/usr/man \
  --docdir=/usr/doc/$PRGNAM-$VERSION \
  --disable-zypp \
  --disable-systemd \
  --disable-pam \
  --disable-selinux \
  --disable-ext4 \
  --build=$ARCH-slackware-linux

# Patrick's rule: -j8 on the build line, not on install.
make -j8
make install DESTDIR=$PKG

# Things that cannot work on this image: SUSE's hourly cron job and the
# systemd helper.
rm -f  $PKG/etc/cron.hourly/suse.de-snapper
rm -rf $PKG/usr/lib/snapper/systemd-helper
rmdir  $PKG/etc/cron.hourly 2>/dev/null || true

# The D-Bus activation file STAYS.  It looks like systemd wiring and is not:
# dbus-daemon starts snapperd from it on demand, and without it Btrfs
# Assistant's Snapper tab is empty even when snapper works on the command
# line (found on the bench, 2026-09-18, by removing it).

# A rescue disk does not need 40 translations or the development headers,
# the upstream testsuite fixtures, or a libtool archive (this image ships no
# .la files -- lt_dlopenext falls back to the .so).
rm -rf $PKG/usr/share/locale
rm -rf $PKG/usr/include
rm -rf $PKG/usr/lib64/snapper/testsuite
rm -f  $PKG/usr/lib64/*.la
rmdir  $PKG/usr/lib64/snapper 2>/dev/null || true

find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true

find $PKG/usr/man -type f -exec gzip -9 {} \+ 2>/dev/null || true

# Upstream leaves /etc/sysconfig/snapper to the distribution's packaging (it is
# EXTRA_DIST, not installed), and snapper refuses to do anything without it --
# "reading sysconfig-file failed".  Ship the stock template.
install -D -m 644 data/sysconfig.snapper $PKG/etc/sysconfig/snapper.new

mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
cp -a COPYING AUTHORS README.md $PKG/usr/doc/$PRGNAM-$VERSION 2>/dev/null || true
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild

mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc
cat $CWD/doinst.sh >> $PKG/install/doinst.sh

cd $PKG
/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.$PKGTYPE