#!/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.

# This is called from the Makefile to build the initramfs.

set -e

unset CDPATH

modules="
-i augeas-libs
-i bash
-i coreutils
-i file
-i iputils
-i kernel
-i lvm2
-i MAKEDEV
-i module-init-tools
-i net-tools
-i ntfs-3g
-i procps
-i strace
-i util-linux-ng
-i dosfstools
-i ntfsprogs
"

# Decide on names for the final output.  These have to match Makefile.am.
output=initramfs.@REPO@.@host_cpu@.img
koutput=vmlinuz.@REPO@.@host_cpu@
rm -f $output
rm -f $koutput

# Create the basic initramfs.
@FEBOOTSTRAP@ $modules -u @UPDATES@ @REPO@ initramfs @MIRROR@

# /sysroot is where the guest root filesystem will be mounted.
mkdir initramfs/sysroot
@FEBOOTSTRAP_RUN@ initramfs -- chmod 0777 /sysroot

# Create /tmp if it is missing.
mkdir -p initramfs/tmp
@FEBOOTSTRAP_RUN@ initramfs -- chmod 0777 /tmp

# Make a safe 'install_file' function to install files into the
# filesystem.  XXX We need a 'febootstrap-install' utility.
# Usage: install_file <local-file> <target-pathname> mode owner[.group]
install_file ()
{
    cp "$1" initramfs/"$2"
    # Get the inode of the new file and remove it from fakeroot.log.
    ino=$(ls -i initramfs/"$2" | awk '{print $1}')
    cp initramfs/fakeroot.log fakeroot.log.old
    grep -v "ino=$ino," fakeroot.log.old > initramfs/fakeroot.log
    rm fakeroot.log.old
    # Set mode, owner and group as desired.
    @FEBOOTSTRAP_RUN@ initramfs -- chmod "$3" "$2"
    @FEBOOTSTRAP_RUN@ initramfs -- chown "$4" "$2"
}

# Nuke some stuff.  The kernel pulls mkinitrd and plymouth which pulls in
# all of Python.  Sheez.
find initramfs -name '*plymouth*' -print0 | xargs -0 rm -rf
find initramfs -name '*python*' -print0 | xargs -0 rm -rf

# Modules take up nearly half of the image.  It's a rough guess that
# we don't need many drivers (which take up most of the space).
find initramfs/lib/modules/*/kernel \
  -name '*.ko' \
  -a ! -name 'mii.ko' \
  -a ! -name '8139cp.ko' \
  -a ! -name 'ext2.ko' \
  -a ! -name 'ext4.ko' \
  -a ! -name 'crc16.ko' \
  -a ! -name 'jbd2.ko' \
  -a ! -name 'fuse.ko' \
  -a ! -name 'vfat.ko' \
  -a ! -name 'fat.ko' \
  -a ! -name 'udf.ko' \
  -a ! -name 'crc_itu_t.ko' \
  -a ! -name 'nls_utf8.ko' \
  -a -delete

# Pull the kernel out into the current directory.  We don't want it in
# the initramfs image.
mv initramfs/boot/vmlinuz* $koutput
rm -rf initramfs/boot

# Minimize the image.
@FEBOOTSTRAP_MINIMIZE@ initramfs

# Add some missing configuration files.
if [ ! -f initramfs/etc/hosts ]; then
    cat > hosts.new <<'__EOF__'
127.0.0.1 guestfs localhost.localdomain localhost
::1       localhost6.localdomain6 localhost6
__EOF__
    install_file hosts.new /etc/hosts 0644 root.root
    rm hosts.new
fi

if [ ! -f initramfs/etc/fstab ]; then
    @FEBOOTSTRAP_RUN@ initramfs -- touch /etc/fstab
fi

echo nameserver 10.0.2.3 > resolv.conf.new
install_file resolv.conf.new /etc/resolv.conf 0644 root.root
rm resolv.conf.new

# Create the init script.
cat > init.new <<'__EOF__'
#!/bin/sh
PATH=/sbin:/usr/sbin:$PATH
MAKEDEV mem null port zero core full ram tty console fd \
  hda hdb hdc hdd sda sdb sdc sdd loop sd
mount -t proc /proc /proc
mount -t sysfs /sys /sys
mount -t devpts -o gid=5,mode=620 /dev/pts /dev/pts
modprobe 8139cp
/sbin/ifconfig lo 127.0.0.1
/sbin/ifconfig eth0 10.0.2.10
/sbin/route add default gw 10.0.2.2
lvm vgscan --ignorelockingfailure
lvm vgchange -ay --ignorelockingfailure
exec guestfsd -f
__EOF__

install_file init.new /init 0755 root.root
rm init.new

# Copy the daemon into the filesystem.
install_file @abs_builddir@/daemon/guestfsd /sbin/guestfsd 0755 root.root

# Generate final image.
@FEBOOTSTRAP_TO_INITRAMFS@ initramfs > $output-t
mv $output-t $output
ls -lh $output
ls -lh $koutput