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/usr/sbin/build-openstack-debian-image is in openstack-debian-images 1.6.

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The actual contents of the file can be viewed below.

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#!/bin/sh

set -e

# Parse input parameters
usage() {
	echo "Usage: $0 --release|-r <jessie|wheezy> [options]
Options are:
 --minimal|-m
 --debootstrap-url|-u <debootstrap-mirror> (default: http://httpredir.debian.org/debian)
 --sources.list-mirror|-s <source-list-mirror> (default: http://httpredir.debian.org/debian)
 --extra-packages|-e <package>,<package>,...
 --hook-script|-hs <hook-script>
 --image-size|-is <image-size> (default: 2G)
 --automatic-resize|-ar
 --automatic-resize-space|-ars <suplementary-space> (default: 50M)
 --login|-l <userlogin> (default: debian)
 --password|-p <root-password> (dangerous option: avoid it if possible)
For more info: man $0"
	exit 1
}

EXTRA=yes
for i in $@ ; do
	case "${1}" in
	"--extra-packages"|"-e")
		if [ -z "${2}" ] ; then
			echo "No parameter defining the extra packages"
			usage
		fi
		EXTRA_PACKAGES=${2}
		shift
		shift
	;;
	"--debootstrap-url"|"-u")
		if [ -z "${2}" ] ; then
			echo "No parameter defining the debootstrap URL"
			usage
		fi
		DEB_MIRROR=${2}
		shift
		shift
	;;
	"--minimal"|"-m")
		EXTRA=no
		shift
	;;
	"--automatic-resize"|"-ar")
		AUTOMATIC_RESIZE=yes
		shift
	;;
	"--automatic-resize-space"|"-ars")
		if [ -z "${2}" ] ; then
			echo "No parameter defining the suplementary space"
			usage
		fi
		AUTOMATIC_RESIZE_SPACE=${2}
		shift
		shift
	;;
	"--image-size"|"-is")
		if [ -z "${2}" ] ; then
			echo "No parameter defining the image size"
			usage
		fi
		IMAGE_SIZE=${2}
		shift
		shift
	;;
	"--hook-script"|"-hs")
		if [ -z "${2}" ] ; then
			echo "No parameter defining the hook script"
			usage
		fi
		if ! [ -x "${2}" ] ; then
			echo "Hook script not executable"
		fi
		HOOK_SCRIPT=${2}
		shift
		shift
	;;
	"--sources.list-mirror"|"-s")
		if [ -z "${2}" ] ; then
			echo "No parameter defining the hook script"
			usage
		fi
		SOURCE_LIST_MIRROR=${2}
		shift
		shift
	;;
	"--release"|"-r")
		if [ "${2}" = "wheezy" ] || [ "${2}" = "jessie" ] || [ "${2}" = "stretch" ] || [ "${2}" = "buster" ] ; then
			RELEASE=${2}
			shift
			shift
		else
			echo "Release not recognized."
			usage
		fi
	;;
	"--login"|"-l")
		if [ -z "${2}" ] ; then
			echo "No parameter defining the user login"
			usage
		fi
		USER_LOGIN=${2}
		shift
		shift
	;;
	"--password"|"-p")
		if [ -z "${2}" ] ; then
			echo "No parameter defining the root password"
		fi
		ROOT_PASSWORD=${2}
		shift
		shift
	;;
	*)
	;;
	esac
done

if [ -z "${RELEASE}" ] ; then
	echo "Release not recognized: please specify the -r parameter."
	usage
fi
case "${RELEASE}" in
	"wheezy")
		RELEASE_NUM=7
	;;
	"jessie")
		RELEASE_NUM=8
	;;
	"stretch")
		RELEASE_NUM=9
	;;
	"buster")
		RELEASE_NUM=10
	;;
esac

if [ -z "${DEB_MIRROR}" ] ; then
	DEB_MIRROR=http://httpredir.debian.org/debian
fi
if [ -z "${EXTRA_PACKAGES}" ] ; then
	EXTRA_PACKAGES=bash-completion,joe,most,screen,less,vim,bzip2,nano
fi
if [ -z "${SOURCE_LIST_MIRROR}" ] ; then
	SOURCE_LIST_MIRROR=http://httpredir.debian.org/debian
fi
if [ -z "${IMAGE_SIZE}" ] ; then
	IMAGE_SIZE=2
fi
if [ -z "${AUTOMATIC_RESIZE_SPACE}" ] ; then
	AUTOMATIC_RESIZE_SPACE=50
fi
if [ -z "${USER_LOGIN}" ] ; then
	USER_LOGIN=debian
fi

NEEDED_PACKAGES=sudo,adduser,locales,extlinux,openssh-server,linux-image-amd64,euca2ools,file,kbd,aptitude
if [ "${RELEASE}" = "wheezy" ] ; then
	# These are needed by cloud-init and friends, and since we don't want backports of them,
	# but just normal packages from Wheezy, we resolve dependencies by hand, prior to using
	# apt-get -t wheezy-backports install cloud-init cloud-utils cloud-initramfs-growroot
	NEEDED_PACKAGES=${NEEDED_PACKAGES},python,python-paramiko,python-argparse,python-cheetah,python-configobj,python-oauth,python-software-properties,python-yaml,python-boto,python-prettytable,initramfs-tools,python-requests,acpid,acpi-support-base
else
	NEEDED_PACKAGES=${NEEDED_PACKAGES},cloud-init,cloud-utils,cloud-initramfs-growroot,dbus,libpam-systemd
fi

if [ ${EXTRA} = "no" ] ; then
	PKG_LIST=${NEEDED_PACKAGES}
else
	PKG_LIST=${NEEDED_PACKAGES},${EXTRA_PACKAGES}
fi
if ! [ `whoami` = "root" ] ; then
	echo "You have to be root to run this script"
	exit 1
fi
FILE_NAME=debian-${RELEASE}-${RELEASE_NUM}.0.0-1-amd64
AMI_NAME=${FILE_NAME}.raw
QCOW2_NAME=${FILE_NAME}.qcow2
rm -f ${AMI_NAME}

set -x

######################################
### Prepare the HDD (format, ext.) ###
######################################
PARTED=/sbin/parted
rm -f $AMI_NAME
qemu-img create ${AMI_NAME} ${IMAGE_SIZE}G
#dd if=/dev/null bs=1M seek=1024 of=${AMI_NAME}

${PARTED} -s ${AMI_NAME} mktable msdos
${PARTED} -s -a optimal ${AMI_NAME} mkpart primary ext3 1Mi 100%
${PARTED} -s ${AMI_NAME} set 1 boot on
install-mbr ${AMI_NAME}
RESULT_KPARTX=`kpartx -asv ${AMI_NAME} 2>&1`

if echo "${RESULT_KPARTX}" | grep "^add map" ; then
	LOOP_DEVICE=`echo ${RESULT_KPARTX} | cut -d" " -f3`
	echo "kpartx mounted using: ${LOOP_DEVICE}"
else
	echo "It seems kpartx didn't mount the image correctly: exiting."
	exit 1
fi

cleanup(){
	error=$?
	[ ! -d "${MOUNT_DIR}" ] && return
	echo
	echo "error $error, umounting $MOUNT_DIR"
	chroot ${MOUNT_DIR} umount /proc || true
	chroot ${MOUNT_DIR} umount /sys || true
	umount ${MOUNT_DIR}
	rmdir ${MOUNT_DIR}
	kpartx -d ${AMI_NAME}
	exit $error
}
trap "cleanup" EXIT TERM INT

# We first use ext2, THEN convert to ext3, because that's so much faster this way.
mkfs.ext2 /dev/mapper/${LOOP_DEVICE}

# No fsck because of X days without checks
tune2fs -i 0 /dev/mapper/${LOOP_DEVICE}

MOUNT_DIR=`mktemp -d -t build-debimg.XXXXXX`
mount -o loop /dev/mapper/${LOOP_DEVICE} ${MOUNT_DIR}
debootstrap --verbose \
	--include=${PKG_LIST} \
	${RELEASE} ${MOUNT_DIR} ${DEB_MIRROR}

############################
### Customize the distro ###
############################
### Customize: access to the VM ###
# # # # # # # # # # # # # # # # # #
# Setup default root password to what has been set on the command line
if [ -n "${ROOT_PASSWORD}" ] ; then
	chroot ${MOUNT_DIR} sh -c "echo root:${ROOT_PASSWORD} | chpasswd"
fi

# Otherwise, we have a huge backdoor, since the root password
# is always the same.
sed -i "s/PermitRootLogin yes/PermitRootLogin without-password/" ${MOUNT_DIR}/etc/ssh/sshd_config

# Add a default user which is used by cloud-init by default
chroot ${MOUNT_DIR} adduser --gecos Cloud-init-user --disabled-password --quiet ${USER_LOGIN}

# Adds the "debian" user to sudoers, since that is the way
# cloud-init grant access
mkdir -p ${MOUNT_DIR}/etc/sudoers.d
echo "${USER_LOGIN} ALL = NOPASSWD: ALL" >${MOUNT_DIR}/etc/sudoers.d/debian-cloud-init
chmod 0440 ${MOUNT_DIR}/etc/sudoers.d/debian-cloud-init

### Customize: misc stuff ###
# # # # # # # # # # # # # # #
# Setup fstab
echo "# /etc/fstab: static file system information.
proc	/proc	proc	nodev,noexec,nosuid	0	0
/dev/vda1	/	ext3	errors=remount-ro	0	1
" > ${MOUNT_DIR}/etc/fstab
chroot ${MOUNT_DIR} mount /proc || true

echo "# disable pc speaker
blacklist pcspkr" >${MOUNT_DIR}/etc/modprobe.d/blacklist.conf

#echo "# Required for cinder hotplug
#acpiphp
#pci_hotplug
#" >>${MOUNT_DIR}/etc/modules

# Enable bash-completion by default
if [ ${EXTRA} = "yes" ] ; then
	echo "# enable bash completion in interactive shells
if ! shopt -oq posix; then
  if [ -f /usr/share/bash-completion/bash_completion ]; then
    . /usr/share/bash-completion/bash_completion
  elif [ -f /etc/bash_completion ]; then
    . /etc/bash_completion
  fi
fi" >>${MOUNT_DIR}/etc/bash.bashrc

	# No clear for the tty1 console
	if [ "${RELEASE}" = "wheezy" ] ; then
		sed -i "s#1:2345:respawn:/sbin/getty 38400 tty1#1:2345:respawn:/sbin/getty --noclear 38400 tty1#" ${MOUNT_DIR}/etc/inittab
	else
		echo ForwardToConsole=yes >> ${MOUNT_DIR}/etc/systemd/journald.conf
	fi


	chroot ${MOUNT_DIR} apt-get install -y locales-all
fi

# Turn off console blanking which is *very* annoying
# and increase KEYBOARD_DELAY because it can be annoying
# over network.
sed -i s/^BLANK_TIME=.*/BLANK_TIME=0/ ${MOUNT_DIR}/etc/kbd/config
sed -i s/^POWERDOWN_TIME=.*/POWERDOWN_TIME=0/ ${MOUNT_DIR}/etc/kbd/config
sed -i 's/^[ \t#]KEYBOARD_DELAY=.*/KEYBOARD_DELAY=1000/' ${MOUNT_DIR}/etc/kbd/config

rm -f ${MOUNT_DIR}/etc/ssh/ssh_host_*
rm -f ${MOUNT_DIR}/etc/udev/rules.d/70-persistent-net.rules
rm -f ${MOUNT_DIR}/lib/udev/write_net_rules

# Setup networking (eg: DHCP by default)
echo "# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The normal eth0
auto eth0
iface eth0 inet dhcp

# Maybe the VM has 2 NICs?
allow-hotplug eth1
iface eth1 inet dhcp

# Maybe the VM has 3 NICs?
allow-hotplug eth2
iface eth2 inet dhcp
" > ${MOUNT_DIR}/etc/network/interfaces

# Setup the default hostname (will be set by cloud-init
# at boot time anyway)
echo "debian.example.com" >${MOUNT_DIR}/etc/hostname

# This should be a correct default everywhere
echo "deb ${SOURCE_LIST_MIRROR} ${RELEASE} main
deb-src ${SOURCE_LIST_MIRROR} ${RELEASE} main" >${MOUNT_DIR}/etc/apt/sources.list

if [ "${RELEASE}" = "wheezy" ] || [ "${RELEASE}" = "jessie" ] ; then
	echo "deb ${SOURCE_LIST_MIRROR} ${RELEASE}-updates main
deb-src ${SOURCE_LIST_MIRROR} ${RELEASE}-updates main
deb http://security.debian.org/ ${RELEASE}/updates main
deb-src http://security.debian.org/ ${RELEASE}/updates main
" >>${MOUNT_DIR}/etc/apt/sources.list
fi

if [ "${RELEASE}" = "wheezy" ] ; then
	echo "deb ${SOURCE_LIST_MIRROR} wheezy-backports main
deb-src ${SOURCE_LIST_MIRROR} wheezy-backports main
" >>${MOUNT_DIR}/etc/apt/sources.list
fi

chroot ${MOUNT_DIR} apt-get update
chroot ${MOUNT_DIR} apt-get upgrade -y

# Setup cloud-init, cloud-utils and cloud-initramfs-growroot
# These are only available from backports in Wheezy
if [ "${RELEASE}" = "wheezy" ] ; then
	chroot ${MOUNT_DIR} apt-get -t wheezy-backports install cloud-init cloud-utils cloud-initramfs-growroot -y
fi

# For OpenStack, we would like to use Ec2 and no other API
echo "# to update this file, run dpkg-reconfigure cloud-init
datasource_list: [ConfigDrive, Openstack, Ec2]" >${MOUNT_DIR}/etc/cloud/cloud.cfg.d/90_dpkg.cfg

# Needed to have automatic mounts of /dev/vdb
echo "mount_default_fields: [~, ~, 'auto', 'defaults,nofail', '0', '2']" >>${MOUNT_DIR}/etc/cloud/cloud.cfg
echo "manage_etc_hosts: true" >>${MOUNT_DIR}/etc/cloud/cloud.cfg

# Set the cloud init default user (required for the keypair to be put in the right home directory)
sed -i "s/name: debian/name: ${USER_LOGIN}/" ${MOUNT_DIR}/etc/cloud/cloud.cfg

# Setting-up initramfs
chroot ${MOUNT_DIR} update-initramfs -u

rm ${MOUNT_DIR}/var/cache/apt/archives/*.deb

# Set console for emergency and rescue shells
SYSTEMD_DIR="${MOUNT_DIR}/etc/systemd/system/"
for service in emergency.service rescue.service ; do
    mkdir "${SYSTEMD_DIR}/${service}.d"
    echo '[Service]
ExecStart=
ExecStart=-/bin/sh -c "/sbin/sulogin /dev/tty0; /bin/systemctl --fail --no-block default"' > "${SYSTEMD_DIR}/${service}.d/console.conf"
done

###########################
### Setting-up extlinux ###
###########################
UUID=`blkid -o value -s UUID /dev/mapper/${LOOP_DEVICE}`
mkdir -p ${MOUNT_DIR}/boot/extlinux 
echo "default linux
timeout 1
label linux
kernel /vmlinuz
append initrd=/initrd.img root=/dev/vda1 console=tty0 console=ttyS0,115200 ro" > ${MOUNT_DIR}/boot/extlinux/extlinux.conf
extlinux --install ${MOUNT_DIR}/boot/extlinux

###################
### HOOK SCRIPT ###
###################
if [ -x ${HOOK_SCRIPT} ] ; then
	export BODI_CHROOT_PATH=${MOUNT_DIR}
	export BODI_RELEASE=${RELEASE}
	${HOOK_SCRIPT}
fi

##########################
### Unmount everything ###
##########################

cleanup(){
	# refine cleanup everything was ok
	echo "Finished."
} 

sync
chroot ${MOUNT_DIR} umount /proc || true
umount ${MOUNT_DIR}
# Run FSCK so that resize can work
tune2fs -j /dev/mapper/${LOOP_DEVICE}
fsck.ext3 -f /dev/mapper/${LOOP_DEVICE} || true

if [ "${AUTOMATIC_RESIZE}" = "yes" ] ; then
	resize2fs -M /dev/mapper/${LOOP_DEVICE}
	FS_BLOCKS=`tune2fs -l /dev/mapper/${LOOP_DEVICE} | awk '/Block count/{print $3}'`
	WANTED_SIZE=`expr $FS_BLOCKS '*' 4 '/' 1024 + ${AUTOMATIC_RESIZE_SPACE}` # Add ${AUTOMATIC_RESIZE_SPACE}M
	resize2fs /dev/mapper/${LOOP_DEVICE} ${WANTED_SIZE}M

	FINAL_FS_BLOCKS=`tune2fs -l /dev/mapper/${LOOP_DEVICE} | awk '/Block count/{print $3}'`
	FINAL_IMG_SIZE=`expr '(' $FINAL_FS_BLOCKS + 258 ')' '*' 4 '/' 1024` # some blocks for mbr and multiple block size (4k)
fi

sync
kpartx -d ${AMI_NAME}
rmdir ${MOUNT_DIR}

if [ "${AUTOMATIC_RESIZE}" = "yes" ] ; then
	# Rebuild a smaller partition table
	parted -s ${AMI_NAME} rm 1
	parted -s ${AMI_NAME} mkpart primary ext3 1Mi ${FINAL_IMG_SIZE}Mi
	parted -s ${AMI_NAME} set 1 boot on

	# Add 2M for the 1M at the beginning of the partition and some additionnal space 
	truncate -s `expr 3 + ${FINAL_IMG_SIZE}`M ${AMI_NAME}
	install-mbr ${AMI_NAME}
fi

QEMU_VERSION=`qemu-img --help | head -n 1 | cut -d" " -f3 | cut -d"," -f1`
if dpkg --compare-versions ${QEMU_VERSION} gt 1.0 ; then
	OTHER_QEMU_IMG_OPTIONS=" -o compat=0.10"
else
	OTHER_QEMU_IMG_OPTIONS=""
fi

qemu-img convert -c -f raw ${AMI_NAME}${OTHER_QEMU_IMG_OPTIONS} -O qcow2 ${QCOW2_NAME}