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#!/bin/bash
set -ex
apt-get -y install --no-install-recommends \
initramfs-tools \
libpng16-16 \
strace \
libsensors5 \
libexpat1 \
libdrm2 \
libdrm-nouveau2
passwd root -d
chsh -s /bin/sh
ln -s /bin/sh /init
#######################################################################
# Strip the image to a small minimal system without removing the debian
# toolchain.
# Copy timezone file and remove tzdata package
rm -rf /etc/localtime
cp /usr/share/zoneinfo/Etc/UTC /etc/localtime
UNNEEDED_PACKAGES="libfdisk1
tzdata
diffutils"
export DEBIAN_FRONTEND=noninteractive
# Removing unused packages
for PACKAGE in ${UNNEEDED_PACKAGES}
do
echo ${PACKAGE}
if ! apt-get remove --purge --yes "${PACKAGE}"
then
echo "WARNING: ${PACKAGE} isn't installed"
fi
done
apt-get autoremove --yes || true
# Dropping logs
rm -rf /var/log/*
# Dropping documentation, localization, i18n files, etc
rm -rf /usr/share/doc/*
rm -rf /usr/share/locale/*
rm -rf /usr/share/man
rm -rf /usr/share/i18n/*
rm -rf /usr/share/info/*
rm -rf /usr/share/lintian/*
rm -rf /usr/share/common-licenses/*
rm -rf /usr/share/mime/*
# Dropping reportbug scripts
rm -rf /usr/share/bug
# Drop udev hwdb not required on a stripped system
rm -rf /lib/udev/hwdb.bin /lib/udev/hwdb.d/*
# Drop all gconv conversions && binaries
rm -rf usr/bin/iconv
rm -rf usr/sbin/iconvconfig
rm -rf usr/lib/*/gconv/
# Remove libusb database
rm -rf usr/sbin/update-usbids
rm -rf var/lib/usbutils/usb.ids
rm -rf usr/share/misc/usb.ids
#######################################################################
# Crush into a minimal production image to be deployed via some type of image
# updating system.
# IMPORTANT: The Debian system is not longer functional at this point,
# for example, apt and dpkg will stop working
UNNEEDED_PACKAGES="apt libapt-pkg5.0 "\
"ncurses-bin ncurses-base libncursesw5 libncurses5 "\
"perl-base "\
"debconf libdebconfclient0 "\
"e2fsprogs e2fslibs libfdisk1 "\
"insserv "\
"udev "\
"init-system-helpers "\
"bash "\
"cpio "\
"passwd "\
"libsemanage1 libsemanage-common "\
"libsepol1 "\
"gzip "\
"gpgv "\
"hostname "\
"adduser "\
"debian-archive-keyring "\
# Removing unneeded packages
for PACKAGE in ${UNNEEDED_PACKAGES}
do
echo "Forcing removal of ${PACKAGE}"
if ! dpkg --purge --force-remove-essential --force-depends "${PACKAGE}"
then
echo "WARNING: ${PACKAGE} isn't installed"
fi
done
# Show what's left package-wise before dropping dpkg itself
COLUMNS=300 dpkg-query -W --showformat='${Installed-Size;10}\t${Package}\n' | sort -k1,1n
# Drop dpkg
dpkg --purge --force-remove-essential --force-depends dpkg
# No apt or dpkg, no need for its configuration archives
rm -rf etc/apt
rm -rf etc/dpkg
# Drop directories not part of ostree
# Note that /var needs to exist as ostree bind mounts the deployment /var over
# it
rm -rf var/* opt srv share
# ca-certificates are in /etc drop the source
rm -rf usr/share/ca-certificates
# No bash, no need for completions
rm -rf usr/share/bash-completion
# No zsh, no need for comletions
rm -rf usr/share/zsh/vendor-completions
# drop gcc-6 python helpers
rm -rf usr/share/gcc-6
# Drop sysvinit leftovers
rm -rf etc/init.d
rm -rf etc/rc[0-6S].d
# Drop upstart helpers
rm -rf etc/init
# Various xtables helpers
rm -rf usr/lib/xtables
# Drop all locales
# TODO: only remaining locale is actually "C". Should we really remove it?
rm -rf usr/lib/locale/*
# partition helpers
rm usr/sbin/*fdisk
# local compiler
rm usr/bin/localedef
# Systemd dns resolver
find usr etc -name '*systemd-resolve*' -prune -exec rm -r {} \;
# Systemd network configuration
find usr etc -name '*networkd*' -prune -exec rm -r {} \;
# systemd ntp client
find usr etc -name '*timesyncd*' -prune -exec rm -r {} \;
# systemd hw database manager
find usr etc -name '*systemd-hwdb*' -prune -exec rm -r {} \;
# No need for fuse
find usr etc -name '*fuse*' -prune -exec rm -r {} \;
# lsb init function leftovers
rm -rf usr/lib/lsb
# Only needed when adding libraries
rm usr/sbin/ldconfig*
# Games, unused
rmdir usr/games
# Remove pam module to authenticate against a DB
# plus libdb-5.3.so that is only used by this pam module
rm usr/lib/*/security/pam_userdb.so
rm usr/lib/*/libdb-5.3.so
# remove NSS support for nis, nisplus and hesiod
rm usr/lib/*/libnss_hesiod*
rm usr/lib/*/libnss_nis*
rm bin/tar
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