#!/bin/bash
#
# Copyright 2015 Hewlett-Packard Development Company, L.P.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
#

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

# effectively: febootstrap-minimize --keep-zoneinfo --keep-rpmdb --keep-services "$target"

# This is only required on CentOS7 ... see notes in
# root.d/08-yum-chroot about %_install_langs
if [[ $DISTRO_NAME == "centos" && $DIB_RELEASE == "7" ]]; then

    # Stripping *all* locales is a bad idea.  For now, we take the
    # suggestion in [1] for reducing this
    # [1] https://bugzilla.redhat.com/show_bug.cgi?id=156477

    if [ ! -f /usr/lib/locale/locale-archive ]; then
        die "locale-archive not found?  Can not do cleanup."
    fi

    # now the archive has everything in it, and is about 100MiB.  Strip it
    # to just en_US (basically, this is the locale we support if you ssh
    # in, other than POSIX)
    localedef --delete-from-archive \
        $(localedef --list-archive | grep -v '^en_US' | xargs)

    # This removes the locales from the archive index but doesn't rebuild
    # the file, so it is still the same size (maybe it is sparse?
    # presumably as it's mmapped you don't want to fiddle with the offsets
    # of locales in the archive on a live system.  We are not live).

    # build-locale-archive is a tool provided by the RH packaging of
    # glibc.  Documentation is scarce, but it takes the pre-built locales
    # in the tmpl file and creates an archive.  It seems originally the
    # installer would set some flags to rpm to tell the package what
    # languages to pick out of the template, but along the way, this was
    # reverted to install them (size considered less important than locale
    # support).

    # We hack this by moving the locale-archive we've removed the extra
    # locales from to the template, then re-run the build.
    mv /usr/lib/locale/locale-archive /usr/lib/locale/locale-archive.tmpl

    # rebuild archive from template
    /usr/sbin/build-locale-archive

    # leave empty template behind as package does.  I think this stops
    # upgrades redoing things
    echo > /usr/lib/locale/locale-archive.tmpl

    # remove the unnecessary source locale files and iconv files
    pushd /usr/share/locale
    find . ! -name 'locale.alias' -delete
    popd
    rm -rf {lib.lib64}/gconv

fi

# docs
rm -rf /usr/share/{doc,info,gnome/help}
# i18n
rm -rf /usr/share/i18n
# sln
rm -rf /sbin/sln
# ldconfig
rm -rf /etc/ld.so.cache /var/cache/ldconfig
mkdir -p --mode=0755 /var/cache/ldconfig