#! /bin/sh -e
###
### Construct a fresh build-chroot base
###
### (c) 2018 Mark Wooding
###

###----- Licensing notice ---------------------------------------------------
###
### This file is part of the distorted.org.uk chroot maintenance tools.
###
### distorted-chroot 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; either version 2 of the
### License, or (at your option) any later version.
###
### distorted-chroot 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.
###
### You should have received a copy of the GNU General Public License
### along with distorted-chroot.  If not, write to the Free Software
### Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
### USA.

. state/config.sh # @@@config@@@

case $PROXY in nil) ;; *) http_proxy=$PROXY; export PROXY ;; esac

badp=nil forcep=nil
while getopts "f" opt; do
  case $opt in
    f) forcep=t ;;
    *) badp=t ;;
  esac
done
shift $(( $OPTIND - 1 ))
case $# in 2) ;; *) badp=t ;; esac
case $badp in t) echo >&2 "usage: $0 [-f] DIST ARCH"; exit 2 ;; esac
d=$1 a=$2

case $d-$a in *-*-*) echo >&2 "$0: bad chroot name \`$arg'"; exit 2 ;; esac
if [ ! -d /dev/$VG/ ]; then echo >&2 "$0: no volume group \`$VG'"; exit 2; fi

qemup=nil dbsopts=
for fa in $FOREIGN_ARCHS; do
  case $fa in
    "$a")
      qemup=t qbsopts=--foreign
      eval qhost=\$${a}_QEMUARCH qhost=\$${a}_QEMUHOST
      break
      ;;
  esac
done

lv=$LVPREFIX$d-$a
mnt=mnt/$lv
mkdir -p $mnt
if mountpoint -q $mnt; then umount $mnt; fi
if [ -b /dev/$VG/$lv ]; then
  case $forcep in
    nil) echo >&2 "$0: volume \`$lv' already exists"; exit 2 ;;
    t) lvremove -f $VG/$lv ;;
  esac
fi
lvcreate --yes $LVSZ -n$lv $VG
mkfs -j -L$d-$a /dev/$VG/$lv
mount -orelatime,data=writeback,commit=3600,barrier=0 /dev/$VG/$lv $mnt/
mkdir -m755 $mnt/fs/
chmod 750 $mnt/
pkgs=ccache,eatmydata,fakeroot,libfile-fcntllock-perl,locales,tzdata
eatmydata debootstrap $dbsopts --arch=$a --variant=minbase \
	  --include=$pkgs $d $mnt/fs/ $DEBMIRROR

case $qemup in
  t)
    install $LOCAL/cross/$d-$qhost/QEMU/qemu-$qarch-static \
	    $mnt/fs/usr/bin/
    chroot $mnt/fs/ /debootstrap/debootstrap --second-stage
    ln -sf /usr/local.schroot/cross/$d-$qhost/QEMU/qemu-$qarch-static \
       $mnt/fs/usr/bin/
    ;;
esac

cd $mnt/fs/usr/
rm -rf local/; ln -s local.schroot/$a local

cd $mnt/fs/etc/apt/
rm -rf apt.conf sources.list
ln -s /usr/local.schroot/config/apt/conf.d/10sbuild apt.conf.d/
ln -s /usr/local.schroot/config/apt/conf.d/90local apt.conf.d/
ln -s /usr/local.schroot/config/apt/sources.$d sources.list

cat >apt.conf.d/20arch <<EOF
### -*-conf-*-

APT {
	Architecture "$a";
};
EOF

cd $mnt/fs/etc/
cp /etc/locale.gen /etc/timezone ./
tz=$(cat timezone); ln -sf /usr/share/zoneinfo/$tz localtime
ln -sf /proc/mounts mtab

cd $mnt/fs/etc/default/
cp /etc/default/locale .

cd $mnt/fs/usr/sbin/
cat >policy-rc.d <<EOF
#! /bin/sh
echo >&2 "policy-rc.d: Services disabled by policy."
exit 101
EOF
chmod +x policy-rc.d

cd $mnt/fs/etc/ld.so.conf.d/
cat >libc.conf <<EOF
# libc default configuration
EOF
cat >zzz-local.conf <<EOF
### -*-conf-*-
### Local hack to make /usr/local/ late.
/usr/local/lib
EOF

cd /
umount $mnt/

case $qemup in
  t)
    schroot -uroot -csource:$LVPREFIX$d-$a -- eatmydata sh -e -c "
	if dpkg-divert >/dev/null 2>&1 --no-rename --help
	then no_rename=--no-rename
	else no_rename=
	fi

	dpkg-divert --package install-cross-tools \$no_rename \
	  --divert /usr/bin/$qemu.$a --add /usr/bin/$qemu"
    $STATE/bin/install-cross-tools $d $a
    ;;
esac

schroot -uroot -csource:$LVPREFIX$d-$a -- eatmydata sh -e -c '
	apt-get update
	apt-get -y upgrade
	locale-gen
	ldconfig
	apt-get -y autoremove
	apt-get clean'

###----- That's all, folks --------------------------------------------------