Customize Grml LiveCD (remaster)

customize-grml.md

Customize Grml LiveCD (remaster)

This little bash script helps you to build your own customized grml.iso

Features

• Include your .ssh/*.pub files into authorized_keys
• Inject Grml Cheats
• Auto download all necessary files (the ISO and grml2usb)

Defaults

• grml96-full_2014.11.iso
• Cheats
• • ssh=grml Start SSH Server and set the root password to grml
• • lang=de keyboard=de German
• • nobeep Suppress beep sound on boot
• • noblank Disable screen energy saving
• • noquick Disable GRML config tool
• • startup=/usr/bin/ip-screen Show IP-Addresses after boot

Usage example

./make-customized-grml.sh [grml.iso file] "[GRML Cheats]"

./make-customized-grml.sh grml64-small_2014.11.iso "ssh=secretPassword noblank welcome"

PS: Dont forget the to warp the GRML-Cheats with quotes.

make-customized-grml.sh

#!/usr/bin/env bash

# The iso file to use as source (gets downloaded if doesnt exists)
ISO=$1
[ "$ISO" = "" ] && ISO="grml96-full_2014.11.iso"

# List of GRML cheat codes to inject
# see http://git.grml.org/?p=grml-live.git;a=blob_plain;f=templates/GRML/grml-cheatcodes.txt;hb=HEAD
GRMLCODES=$2
[ "$GRMLCODES" = "" ] && GRMLCODES="ssh=grml lang=de keyboard=de nobeep noblank noquick startup=/usr/bin/ip-screen"


USER=`whoami`
TMPDIR="./grml_tmp"
OVERLAYDIR="./grml_overlay"
OUTFILE=`echo $ISO | sed -e 's/.iso$/-customized.iso/'`

function errorAndExit {
  echo ERROR: $1
  exit 1
}


if [ ! -d "grml2usb" ] ; then
  echo Downloading grml2usb
  mkdir grml2usb
  cd grml2usb
  curl -s http://grml.org/grml2usb/grml2usb.tgz | tar --strip 1 -xz \
    || errorAndExit "Could not download grml2usb from http://grml.org/grml2usb/grml2usb.tgz"
  cd ..

  # Patch grml2usb to use python2
  [ ! which python &>/dev/null ] && errorAndExit "python executable not found! I need version 2"
  PYTHONVER2=`python -c 'import sys; print("%i" % (sys.hexversion<0x03000000))'`
  if [ "$PYTHONVER2" != "1" ]; then
    [ ! which python2 &>/dev/null] && errorAndExit "python version is > 2 and i didnt find python2 executable"
    sed -i '1 s/.*/#!\/usr\/bin\/env python2/g' grml2usb/grml2usb
  fi
fi


if [ ! -f "$ISO" ] ; then
  echo Downloading $ISO
  wget -q --show-progress http://download.grml.org/$ISO \
    || errorAndExit "Could not download $ISO"
fi

[ -d $TMPDIR ] || mkdir -p $TMPDIR
[ -d $OVERLAYDIR ] || mkdir -p $OVERLAYDIR


echo Including public SSH keys into authorized_keys
mkdir -p $TMPDIR/root/.ssh $TMPDIR/home/grml/.ssh
chmod 0700 $TMPDIR/root/.ssh $TMPDIR/home/grml/.ssh
cat /home/$USER/.ssh/*.pub > $TMPDIR/root/.ssh/authorized_keys
cat /home/$USER/.ssh/*.pub > $TMPDIR/home/grml/.ssh/authorized_keys
sudo chown -R 1000:1000 $TMPDIR/home/grml || exit 1

echo Generating overlay
tar --numeric-owner -j -c -f $OVERLAYDIR/config.tbz $TMPDIR || exit 1

echo Generating $OUTFILE
[ -f "OUTFILE" ] && rm $OUTFILE
sudo python=python2 GRML2USB=grml2usb/grml2usb grml2usb/grml2iso -b "$GRMLCODES" -c $OVERLAYDIR -o $OUTFILE $ISO
sudo chown $USER $OUTFILE

echo Cleanup
rm -rf $OVERLAYDIR $TMPDIR

echo
echo DONE
echo Your new ISO is $OUTFILE
echo I injected your pubkey and following GRML cheats: $GRMLCODES

Please have also a look at https://gitlab.com/blurayne/grml-iso-remaster