NBash

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#!/bin/sh
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#
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# Copyright (C) 2012,2014,2016  Etersoft
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# Copyright (C) 2012,2014,2016  Vitaly Lipatov <lav@etersoft.ru>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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load_helper epm-check_updated_repo
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__epm_add_alt_apt_downgrade_preferences()
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{
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    [ -r /etc/apt/preferences ] && fatal "/etc/apt/preferences already exists"
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    cat <<EOF | sudocmd tee /etc/apt/preferences
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# classic repo
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Package: *
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Pin: release c=classic
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Pin-Priority: 1001
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# overload with addon repo
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Package: *
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Pin: release c=addon
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Pin-Priority: 1101
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# main repo
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Package: *
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Pin: release c=main
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Pin-Priority: 1201
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# overload with test (task) repo
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Package: *
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Pin: release c=task
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Pin-Priority: 1301
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EOF
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}
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# See https://wiki.debian.org/ru/AptPreferences
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__epm_add_deb_apt_downgrade_preferences()
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{
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    [ -r /etc/apt/preferences ] && fatal "/etc/apt/preferences already exists"
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    info "Running with /etc/apt/preferences:"
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    cat <<EOF | sudorun tee /etc/apt/preferences
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Package: *
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Pin: release a=stable
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Pin-Priority: 1001
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Package: *
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Pin: release a=testing
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Pin-Priority: 900
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Package: *
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Pin: release a=unstable
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Pin-Priority: 800
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EOF
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}
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__epm_remove_apt_downgrade_preferences()
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{
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    sudocmd rm -f /etc/apt/preferences
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}
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epm_downgrade()
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{
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    local CMD
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    # it is useful for first time running
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    update_repo_if_needed
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    # if possible, it will put pkg_urls into pkg_files and reconstruct pkg_filenames
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    if [ -n "$pkg_urls" ] ; then
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        info "Downloading packages assigned to downgrade ..."
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        load_helper epm-download
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        __handle_pkg_urls_to_install
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    fi
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    info "Running command for downgrade packages"
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    case $BASEDISTRNAME in
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    alt)
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        # pass pkg_filenames too
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        if [ -n "$pkg_names" ] ; then
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            __epm_add_alt_apt_downgrade_preferences || return
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            load_helper epm-install
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            (pkg_names=$(get_only_installed_packages $pkg_names) epm_install)
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            __epm_remove_apt_downgrade_preferences
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        elif [ -n "$pkg_files" ] ; then
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            load_helper epm-install
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            local pkgs=''
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            local i
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            for i in $pkg_files ; do
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                local pkgname="$(epm print name for package $i)"
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                is_installed $pkgname || continue
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                pkgs="$pkgs $i"
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            done
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            (force="$force --oldpackage" epm_install_files $pkgs)
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        else
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            __epm_add_alt_apt_downgrade_preferences || return
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            load_helper epm-upgrade
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            epm_upgrade "$@"
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            __epm_remove_apt_downgrade_preferences
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        fi
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        return
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        ;;
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    esac
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    case $PMTYPE in
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    #apt-rpm)
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    #    ;;
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    apt-dpkg)
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        local APTOPTIONS="$(subst_option non_interactive -y) $force_yes"
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        __epm_add_deb_apt_downgrade_preferences || return
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        if [ -n "$pkg_filenames" ] ; then
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            sudocmd apt-get $APTOPTIONS install $pkg_filenames
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        else
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            sudocmd apt-get $APTOPTIONS dist-upgrade
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        fi
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        __epm_remove_apt_downgrade_preferences
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        ;;
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    yum-rpm)
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        # can do update repobase automagically
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        if [ -n "$pkg_filenames" ] ; then
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            sudocmd yum downgrade $pkg_filenames
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        else
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            sudocmd yum distro-sync
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        fi
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        ;;
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    dnf-rpm)
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        if [ -n "$pkg_filenames" ] ; then
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            sudocmd dnf downgrade $pkg_filenames
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        else
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            sudocmd dnf distro-sync
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        fi
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        ;;
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    urpm-rpm)
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        assure_exists urpm-reposync urpm-tools
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        sudocmd urpm-reposync -v
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        ;;
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    *)
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        fatal "Have no suitable command for $PMTYPE"
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        ;;
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    esac
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}
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