NBash

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#!/bin/sh
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#
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# Copyright (C) 2013, 2016, 2017, 2019, 2020, 2021  Etersoft
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# Copyright (C) 2013, 2016, 2017, 2019, 2020, 2021  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-release_upgrade
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get_prev_release()
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{
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    local FROM="$1"
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    case "$FROM" in
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    "p8")
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        echo "p7" ;;
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    "p9")
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        echo "p8" ;;
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    "p10")
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        echo "p9" ;;
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    "c7")
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        echo "c6" ;;
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    "c8")
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        echo "c7" ;;
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    "c8.1")
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        echo "c8" ;;
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    "c8.2")
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        echo "c8.1" ;;
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    "c9f1")
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        echo "c8" ;;
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    "c9f2")
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        echo "c9f1" ;;
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    "10")
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        echo "9" ;;
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    *)
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        echo "$FROM" ;;
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    esac
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}
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# FIXME: see epm_release_upgrade
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epm_release_downgrade()
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{
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    assure_root
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    assure_safe_run
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    info "Starting upgrade/switch whole system to other release"
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    info "Check also http://wiki.etersoft.ru/Admin/UpdateLinux"
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    cd /tmp || fatal
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    # TODO: it is possible eatmydata does not do his work
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    export EPMNOEATMYDATA=1
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    case $BASEDISTRNAME in
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    "alt")
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        __epm_ru_update || fatal
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        # try to detect current release by repo
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        if [ "$DISTRVERSION" = "Sisyphus" ] || [ -z "$DISTRVERSION" ] ; then
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            local dv
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            dv="$(__detect_alt_release_by_repo)"
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            if [ -n "$dv" ] && [ "$dv" != "$DISTRVERSION" ] ; then
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                DISTRVERSION="$dv"
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                info "Detected running $DISTRNAME $DISTRVERSION (according to using repos)"
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            fi
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        fi
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        TARGET=""
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        [ -n "$3" ] && fatal "Too many args: $*"
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        if [ -n "$2" ] ; then
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            DISTRVERSION="$1"
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            info "Force current distro version as $DISTRVERSION"
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            TARGET="$2"
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        elif [ -n "$1" ] ; then
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            TARGET="$1"
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        fi
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        [ -n "$TARGET" ] || TARGET="$(get_prev_release $DISTRVERSION)"
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        __alt_repofix
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        __switch_alt_to_distro $DISTRVERSION $TARGET && info "Done. The system has been successfully downgraded to the previous release '$TARGET'."
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        return 0
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        ;;
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    *)
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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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        #docmd epm update
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        info "Have no idea how to downgrade $DISTRNAME"
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        ;;
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    *-dpkg)
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        assure_exists do-release-upgrade update-manager-core
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        sudocmd do-release-upgrade
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        ;;
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    packagekit)
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        docmd pkcon upgrade-system "$@"
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        ;;
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    yum-rpm)
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        docmd epm install rpm yum
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        sudocmd yum clean all
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        info "Try manually:"
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        showcmd rpm -Uvh http://mirror.yandex.ru/fedora/linux/releases/16/Fedora/x86_64/os/Packages/fedora-release-16-1.noarch.rpm
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        showcmd epm Upgrade
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        ;;
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    dnf-rpm)
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        info "Check https://fedoraproject.org/wiki/DNF_system_upgrade for an additional info"
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        docmd epm install dnf
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        #docmd epm install epel-release yum-utils
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        sudocmd dnf --refresh upgrade
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        sudocmd dnf clean all
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        assure_exists dnf-plugin-system-upgrade
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        sudocmd dnf upgrade --refresh
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        local RELEASEVER="$1"
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        [ -n "$RELEASEVER" ] || RELEASEVER=$(($DISTRVERSION + 1))
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        #[ -n "$RELEASEVER" ] || fatal "Run me with new version"
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        confirm_info "Upgrade to $DISTRNAME/$RELEASEVER"
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        sudocmd dnf system-upgrade download --refresh --releasever=$RELEASEVER
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        # TODO: from docs:
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        # dnf system-upgrade reboot
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        # FIXME: download all packages again
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        sudocmd dnf distro-sync --releasever=$RELEASEVER
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        info "Run epm autoorphans to remove orphaned packages"
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        ;;
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    urpm-rpm)
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        sudocmd urpmi.removemedia -av
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        info "Try do manually:"
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        showcmd urpmi.addmedia --distrib http://mirror.yandex.ru/mandriva/devel/2010.2/i586/
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        sudocmd urpmi --auto-update --replacefiles
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        ;;
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    zypper-rpm)
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        docmd epm repolist
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        # TODO
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        # sudocmd zypper rr <номер_репозитория>
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        showcmd rr N
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        showcmd epm ar http://mirror.yandex.ru/opensuse/distribution/11.1/repo/oss 11.1oss
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        showcmd zypper ref
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        docmd epm update
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        docmd epm install rpm zypper
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        docmd epm upgrade
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        ;;
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    pacman)
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        epm Upgrade
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        ;;
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    conary)
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        epm Upgrade
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        ;;
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    emerge)
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        epm Upgrade
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        ;;
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    guix)
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        sudocmd guix pull --verbose
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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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