#!/bin/bash -
# @configure_input@
# Copyright (C) 2009 Red Hat Inc.
#
# 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; either version 2 of the License, or
# (at your option) any later version.
#
# 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.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

# Helper script which constructs the supermin appliance at runtime.

unset CDPATH

set -e

# Source directory containing the supermin input files.
sourcedir=$(cd "$1" > /dev/null; pwd)

# Output files.
kernel="$2"
initrd="$3"

# Kernel:
# Look for the most recent kernel named vmlinuz-*.<arch>* which has a
# corresponding directory in /lib/modules/. If the architecture is x86, look
# for any x86 kernel.

arch=$(echo "@host_cpu@" | sed 's/^i.86$/i?86/')
for f in $(ls -1vr /boot/vmlinuz-*.$arch* 2>/dev/null | grep -v xen); do
    b=$(basename "$f")
    b=$(echo "$b" | sed 's,vmlinuz-,,')
    modpath="/lib/modules/$b"
    if [ -d "$modpath" ]; then
	ln -sf "$f" "$kernel"
	break
    fi
    modpath=
done

if [ -z "$modpath" ]; then
    echo "$0: failed to find a suitable kernel" >&2
    exit 1
fi

# The initrd consists of these components:
# (1) The base skeleton appliance that we constructed at build time.
#     name = initramfs.@REPO@.@host_cpu@.supermin.img
#     format = compressed cpio
# (2) The modules from modpath which are on the module whitelist.
#     format = plain cpio
# (3) The host files which match wildcards in *.supermin.hostfiles.
#     format = plain cpio

cp "$sourcedir"/initramfs.@REPO@.@host_cpu@.supermin.img "$initrd"

# Kernel modules (2).
exec 5<"$sourcedir"/kmod.whitelist
whitelist=
while read kmod 0<&5; do
    whitelist="$whitelist -o -name $kmod"
done
exec 5<&-

find "$modpath" \( -not -name '*.ko' $whitelist \) -a -print0 |
  cpio --quiet -o -0 -H newc >> "$initrd"

# Host files (3).

(cd / && \
  ls -1df $(
      cat "$sourcedir"/initramfs.@REPO@.@host_cpu@.supermin.hostfiles
    ) 2>/dev/null |
  cpio --quiet -o -H newc ) >> "$initrd"