#!/bin/sh
# Filename:      /etc/debootstrap/chroot-script
# Purpose:       script executed in chroot when installing Debian via grml-debootstrap
# Authors:       grml-team (grml.org), (c) Michael Prokop <mika@grml.org>
# Bug-Reports:   see http://grml.org/bugs/
# License:       This file is licensed under the GPL v2.
# Latest change: Mon Apr 16 18:39:21 CEST 2007 [mika]
################################################################################

set -e # exit on any error

. /etc/debootstrap/config    || exit 1
. /etc/debootstrap/variables || exit 1

[ -r /proc/1 ] || mount -t proc   none /proc

# variable checks {{{

# use aptitude only if it's available
if [ -x /usr/bin/aptitude ] ; then
   APTINSTALL='aptitude -y install '
   APTUPDATE='aptitude update'
else
   APTINSTALL='apt-get --force-yes -y install'
   APTUPDATE='apt-get update'
fi

if [ -z "$STAGES" ] ; then
   STAGES='/etc/debootstrap/stages'
   [ -d "$STAGES" ] || mkdir -p "$STAGES"
fi
# }}}

# helper functions {{{
stage() {
  if [ -n "$2" ] ; then
     echo "$2" > "$STAGES/$1"
     return 0
  elif grep -q done "$STAGES/$1" 2>/dev/null ; then
     echo "Notice: stage $1 has been executed already, skipping execution therefore.">&2
     return 1
  fi
}
# }}}

# define chroot mirror {{{
chrootmirror() {
  if [ -n "$CHROOTMIRROR" ] ; then
     echo "deb $CHROOTMIRROR $RELEASE main contrib non-free" > /etc/apt/sources.list
  fi
}
# }}}

# set up grml repository {{{
grmlrepos() {
  if [ -n "$GRMLREPOS" ] ; then
     cat >> /etc/apt/sources.list << EOF
# stable repository:
  deb     http://deb.grml.org/ grml-stable  main
  deb-src http://deb.grml.org/ grml-stable  main

# testing/development repository:
  deb     http://deb.grml.org/ grml-testing main
  deb-src http://deb.grml.org/ grml-testing main
'
EOF
  fi
}
# }}}

# set up kernel-img.conf {{{
kernelimg_conf() {
  if ! [ -r /etc/kernel-img.conf ] ; then
     echo "Setting up /etc/kernel-img.conf"
     cat > /etc/kernel-img.conf << EOF
# Kernel Image management overrides
# See kernel-img.conf(5) for details
do_initrd = Yes
do_symlinks = Yes
EOF
  fi
}
# }}}

# create default devices {{{
makedev() {
  if ! [ -r /dev/hda20 ] ; then
     echo "Creating generic devices in /dev - this might take a while..."
     cd /dev && MAKEDEV generic
  fi
}
# }}}

# install additional packages {{{
packages() {
  if [ "$PACKAGES" = 'yes' ] ; then
     if ! [ -r /etc/debootstrap/packages ] ; then
       echo "Error: /etc/debootstrap/packages not found, exiting."
       exit 1
     else
       $APTUPDATE
       DEBIAN_FRONTEND=$DEBIAN_FRONTEND $APTINSTALL $(cat /etc/debootstrap/packages) $GRMLPACKAGES
     fi
  fi
}
# }}}

# install extra packages {{{
extrapackages() {
    if [ "$EXTRAPACKAGES" = 'yes' ] ; then 
        PACKAGELIST=$(find /etc/debootstrap/extrapackages -type f -name '*.deb')
        if [ -n "$PACKAGELIST" ]; then
            dpkg -i $PACKAGELIST
            # run apt again to resolve any deps 
            DEBIAN_FRONTEND=$DEBIAN_FRONTEND $APTINSTALL
        fi
    fi
}
# }}}

#  sarge specific stuff: mkinitrd {{{
mkinitrd() {
  if [ "$RELEASE" = 'sarge' ] ; then
     sed -i "s#ROOT=probe#ROOT=$TARGET#" /etc/mkinitrd/mkinitrd.conf
  fi
}
# }}}

# install kernel packages {{{
kernel() {
  # do not override $KERNEL if set via config file
  if [ -z "$KERNEL" ] ; then
     if [ "$ARCH" = 'i386' ] ; then
        KERNEL='2.6-686'
     elif [ "$ARCH" = 'amd64' ] ; then
        KERNEL='2.6-amd64'
     fi
  fi

  if [ -n "$KERNEL" ] ; then
     $APTUPDATE
     if [ "$RELEASE" = 'sarge' ] ; then
        KERNELPACKAGES="kernel-image-$KERNEL kernel-headers-$KERNEL"
     else
        KERNELPACKAGES="linux-image-$KERNEL linux-headers-$KERNEL"
     fi
      DEBIAN_FRONTEND=$DEBIAN_FRONTEND $APTINSTALL $KERNELPACKAGES
  fi
}
# }}}

# reconfigure packages {{{
reconfigure() {
  if [ -n "$RECONFIGURE" ] ; then
     for package in $RECONFIGURE ; do
         dpkg --list $package 1>/dev/null 2>/dev/null && \
         DEBIAN_FRONTEND=$DEBIAN_FRONTEND dpkg-reconfigure $package || \
         echo "Warning: $package does not exist, can not reconfigure it."
     done
  fi
}
# }}}

# set password of user root {{{
setpassword() {
# Set a password, via chpasswd.
# Use perl rather than echo, to avoid the password
# showing in the process table. (However, this is normally
# only called when first booting the system, when root has no
# password at all, so that should be an unnecessary precaution).
#
# Pass in three arguments: the user, the password, and 'true' if the
# password has been pre-crypted (by preseeding).
#
# Taken from /var/lib/dpkg/info/passwd.config
        SETPASSWD_PW="$2"
        export SETPASSWD_PW

        # This is very annoying. chpasswd cannot handle generating md5
        # passwords as it is not PAM-aware. Thus, I have to work around
        # that by crypting the password myself if md5 is used.
        USE_MD5=1
        export USE_MD5

        if [ "$3" = true ]; then
                PRECRYPTED=1
        else
                PRECRYPTED=''
        fi
        export PRECRYPTED
        LC_ALL=C LANGUAGE=C LANG=C perl -e '
                sub CreateCryptSalt {
                        my $md5 = shift;

                        my @valid = split(//, "./0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ");
                        my ($in, $out);

                        my $cryptsaltlen = ($md5 ? 8 : 2);

                        open (F, "</dev/urandom") || die "No /dev/urandom found!";
                        foreach (1..$cryptsaltlen) {
                                read(F, $in, 1);
                                $out .= $valid[ord($in) % ($#valid + 1)];
                        }
                        close F;
                        return ($md5 ? "\$1\$$out\$" : $out);
                }

                open(P,"| chpasswd -e");
                if ($ENV{PRECRYPTED}) {
                        print P shift().":$ENV{SETPASSWD_PW}\n";
                } else {
                        print P shift().":".
                                crypt($ENV{SETPASSWD_PW}, CreateCryptSalt($ENV{USE_MD5})).
                                "\n";
                }
                close P;
        ' "$1"
        SETPASSWD_PW=''
        USE_MD5=''
        PRECRYPTED=''
}

passwords() {
  echo "Activating shadow passwords."
  shadowconfig on

  if [ -n "$ROOTPASSWORD" ] ; then
     setpassword root "$ROOTPASSWD" false
     export ROOTPASSWD=''
  else
     echo "Setting password for user root:"
     set +e # do not exit if passwd returns error due to missmatching passwords
     passwd
     echo ""
     set -e # restore default behaviour again
  fi
}
# }}}

# set up /etc/hosts {{{
hosts() {
  if ! [ -f /etc/hosts ] ; then
     echo "Setting up /etc/hosts"
     echo "127.0.0.1       localhost  $HOSTNAME" > /etc/hosts
  fi
}
# }}}

# set up /etc/network/interfaces {{{
interfaces() {
  if ! [ -f /etc/network/interfaces ] ; then
     echo "Setting up /etc/network/interfaces"
     cat >> /etc/network/interfaces << EOF
iface lo inet loopback
iface eth0 inet dhcp
auto lo
auto eth0
EOF
  fi
}
# }}}

# adjust timezone {{{
timezone() {
  if [ -n "$TIMEZONE" ] ; then
     echo "Adjusting /etc/localtime"
     ln -sf /usr/share/zoneinfo/$TIMEZONE /etc/localtime
  fi
}
# }}}

# helper function for fstab() {{{
createfstab(){
     echo "Setting up /etc/fstab"
cat > /etc/fstab << EOF
$TARGET      /            auto    defaults,errors=remount-ro 0   1
/sys           /sys         sysfs   rw,nosuid,nodev,noexec     0   0
proc           /proc        proc    defaults                   0   0
/dev/cdrom     /mnt/cdrom0  iso9660 ro,user,noauto             0   0
# some other examples:
# /dev/sda2       none         swap    sw                   0   0
# /dev/hda1       /Grml        ext3    dev,suid,user,noauto 0  2
# //1.2.3.4/pub   /smb/pub     smbfs   defaults,user,noauto,uid=grml,gid=grml 0 0
# linux:/pub      /beer        nfs     defaults             0  0
# tmpfs           /tmp         tmpfs   size=300M            0  0
EOF
}
# }}}

# generate /etc/fstab {{{
fstab() {
  # set up /etc/fstab if file is not present (cdebootstrap)
  if [ ! -f /etc/fstab  ] ; then
     createfstab
  fi

  # set up /etc/fstab if file is UNCONFIGURED (debootstrap)
  if grep -q UNCONFIGURED /etc/fstab ; then
     createfstab
  fi
}
# }}}

# set up hostname {{{
hostname() {
  if [ -n "$HOSTNAME" ] ; then
     echo "Setting hostname to ${HOSTNAME}."
     echo "$HOSTNAME" > /etc/hostname
  fi
}
# }}}

# generate initrd/initramfs {{{
initrd() {
  # assume the first available kernel as our main kernel
  KERNELIMG=$(ls -1 /boot/vmlinuz-* | head -1)
  KERNELVER=${KERNELIMG#/boot/vmlinuz-}

  # generate initrd
  if [ -n "$INITRD" ] ; then
     if [ "$RELEASE" = 'sarge' ] ; then
        echo "Release sarge detected, will not create an initrd."
     else
        echo "Generating initrd."
        update-initramfs -c -t -k $KERNELVER
        if [ -f "/boot/initrd.img-$KERNELVER" ] ; then
           GRUBINITRD="initrd          /boot/initrd.img-$KERNELVER"
           LILOINITRD="        initrd=/boot/initrd.img-$KERNELVER"
        fi
     fi
  fi
}
# }}}

# grub configuration/installation {{{
grub() {
  if [ -z "$GROOT" ] ; then
     echo "Warning: \$GROOT is not defined, will not adjust grub configuration therefore."
  else
     echo "Adjusting grub configuration for use on ${GROOT}."

     # copy stage-files to /boot/grub/
     [ -d /boot/grub/ ] || mkdir /boot/grub
     # i386 specific:
     [ -d /usr/lib/grub/i386-pc ]   && cp /usr/lib/grub/i386-pc/* /boot/grub/
     # amd64 specific:
     [ -d /usr/lib/grub/x86_64-pc ] && cp /usr/lib/grub/x86_64-pc/* /boot/grub/
     # sarge ships grub files in another directory
     [ "$RELEASE" = 'sarge' ]       && cp /lib/grub/i386-pc/* /boot/grub/

     # finally install grub
     if [ -x /usr/sbin/update-grub ] ; then
        UPDATEGRUB='/usr/sbin/update-grub'
     else
        UPDATEGRUB='/sbin/update-grub'
     fi
     $UPDATEGRUB -y
     if [ -f /boot/grub/menu.lst ] ; then
        sed -i "s/^# groot=.*/# groot=(${GROOT})/g" /boot/grub/menu.lst
        sed -i "s|^# kopt=root=.*|# kopt=root=${TARGET} ro ${BOOT_APPEND}|g" /boot/grub/menu.lst
        # not sure why savedefault does not work for me; any ideas?
        sed -i "s/^savedefault.*/# &/g" /boot/grub/menu.lst
        $UPDATEGRUB -y
     fi
  fi
}
# }}}

# make sure we don't have any running processes left {{{
services() {
  for service in ssh mdadm mdadm-raid ; do
      [ -x "/etc/init.d/$service" ] && "/etc/init.d/$service" stop
  done
}
# }}}

# unmount all filesystems in chroot, make sure nothing is left {{{
finalize() {
  # make sure we don't leave any sensible data
  rm -f /etc/debootstrap/variables
  umount -a    1>/dev/null 2>/dev/null || true
  umount /proc 1>/dev/null 2>/dev/null || true
  umount /proc 1>/dev/null 2>/dev/null || true
  umount -a    1>/dev/null 2>/dev/null || true
}
# }}}

# execute the functions {{{
  stage chrootmirror   && chrootmirror   && stage chrootmirror done
  stage grmlrepos      && grmlrepos      && stage grmlrepos done
  stage kernelimg_conf && kernelimg_conf && stage kernelimg_conf done
  stage makedev        && makedev        && stage makedev done
  stage packages       && packages       && stage packages done
  stage extrapackages  && extrapackages  && stage extrapackages done
  stage mkinitrd       && mkinitrd       && stage mkinitrd done
  stage kernel         && kernel         && stage kernel done
  stage reconfigure    && reconfigure    && stage reconfigure done
  stage hosts          && hosts          && stage hosts done
  stage interfaces     && interfaces     && stage interfaces done
  stage timezone       && timezone       && stage timezone done
  stage fstab          && fstab          && stage fstab done
  stage hostname       && hostname       && stage hostname done
  stage initrd         && initrd         && stage initrd done
  stage grub           && grub           && stage grub done
  stage passwords      && passwords      && stage passwords done
  stage services       && services       && stage services done
  stage finalize       && finalize       && stage finalize done
# }}}

# finally exit the chroot {{{
  echo "Finished chroot installation, exiting."
  exit 0
# }}}

## END OF FILE #################################################################
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