remaster

#!/bin/bash

# Programas necesarios
needed="rsync genisoimage mksquashfs xorriso"

for need in ${needed}; do
  if ! which ${need} ; then
      echo "Se necesita el programa ${need}"
      exit 1
  fi
done

if [ ! -w / ]; then
  echo "Correr como root"
  exit 1
fi

iso="${1}"

if [ -z "${iso}" ]; then 
  echo "Pasar una ISO como argumento"
  exit 1
fi

umount filesystem
umount tmp
mkdir -p tmp filesystem jail iso archives
mount -o loop "${iso}" tmp/

mount -o loop tmp/casper/filesystem.squashfs filesystem/ || {
  echo "No se pudo montar el sistema de archivos squashfs"
  exit 1
}

echo "Sincronizando filesystem/ => jail/"
#cp -a filesystem/* jail/
rsync -avHAX --delete-after --progress --human-readable filesystem/ jail/
rsync -avHAX --delete-after --progress --human-readable --exclude="*.squashfs" tmp/ iso/

mount --bind archives jail/var/cache/apt/archives/

umount filesystem tmp

echo "Ahora puede hacer los cambios necesarios en el chroot, cuando salga se creará la ISO"

cp -fv /etc/resolv.conf jail/etc/

shift
mkdir -p jail/root/remaster
cp -rfv $@ files/* jail/root/remaster/
# http://major.io/2014/06/26/install-debian-packages-without-starting-daemons/
echo '#!/bin/sh' >jail/usr/sbin/policy-rc.d
echo 'exit 101'  >jail/usr/sbin/policy-rc.d
chmod +x jail/usr/sbin/policy-rc.d

if which systemd-nspawn ; then
systemd-nspawn -D jail /root/remaster/${1##*/}
else
mount -t proc none jail/proc
mount -t sysfs none jail/sys
mount --bind /dev jail/dev
chroot jail/ /root/remaster/${1##*/}

umount jail/proc jail/sys jail/dev
fi

umount jail/var/cache/apt/archives/
rm -fv jail/usr/sbin/policy-rc.d
rm -rf jail/root/remaster