diskimage-builder/diskimage_builder/elements/gentoo/finalise.d/99-cleanup

#!/bin/bash

if [[ ${DIB_DEBUG_TRACE:-0} -gt 0 ]]; then
    set -x
fi
set -eu
set -o pipefail

if mountpoint -q /dev/shm; then
    echo "/dev/shm found in /proc/self/mountinfo"
elif [[ -k /dev/shm ]]; then
    echo "/dev/shm exists and is stickied"
else
    fix_shm
fi

# sync if needed
[[ ! -e /usr/portage/profiles ]] && emerge-webrsync

# make world consistent
emerge ${GENTOO_EMERGE_DEFAULT_OPTS} --complete-graph=y --update --newuse --deep @world
# rebuild packages that might need it
emerge ${GENTOO_EMERGE_DEFAULT_OPTS} --usepkg=n @preserved-rebuild
# remove unneeded packages
emerge --verbose=n --depclean
# rebuild packages that might have somehow depended on the unneeded packages
emerge ${GENTOO_EMERGE_DEFAULT_OPTS} --usepkg=n @preserved-rebuild

# update config files
etc-update --automode -5

# clean up portage files
emerge --verbose=n --depclean
emaint all -f
eselect news read all

if [[ "${GENTOO_PORTAGE_CLEANUP}" != "False" ]]; then
    # remove the overlays
    if [[ ${GENTOO_OVERLAYS} != '' ]]; then
        for OVERLAY in ${GENTOO_OVERLAYS}; do
            layman -d "${OVERLAY}"
        done
    fi
fi

unfix_shm

# remove within the chroot since /var/run is a symlink
rm -Rf /var/run/* /run/*