qubes-core-admin-linux/dom0-updates/qubes-dom0-update

#!/bin/bash

quote_args() {
    local quoted_args=""

    for arg in "${@}"; do
        quoted_args="${quoted_args} \"${arg}\""
    done

    echo "${quoted_args}"
}

find_regex_in_args() {
    local regex="${1}"
    shift 1

    for arg in "${@}"; do
        if echo "${arg}" | grep -q -e "${regex}"; then
            return 0
        fi
    done

    return 1
}

UPDATEVM=`qubes-prefs --force-root updatevm`
UPDATES_STAT_FILE=/var/lib/qubes/updates/dom0-updates-available

if [ -z "$UPDATEVM" ]; then
    echo "UpdateVM not set, exiting"
    exit 1
fi

if [ "$1" = "--help" ]; then
    echo "This tool is used to download packages for dom0. Without package list"
    echo "it checks for updates for installed packages"
    echo ""
    echo "Usage: $0 [--clean] [--check-only] [--gui] [<pkg list>]"
    echo "    --clean      clean dnf cache before doing anything"
    echo "    --check-only only check for updates (no install)"
    echo "    --gui        use gpk-update-viewer for update selection"
    echo "    --action=... use specific dnf action, instead of automatic install/update"
    echo "    <pkg list>   download (and install if run by root) new packages"
    echo "                 in dom0 instead of updating"
    exit
fi

PKGS=()
YUM_OPTS=()
GUI=
CHECK_ONLY=
ALL_OPTS=( "${@}" )
YUM_ACTION=
QVMRUN_OPTS=
CLEAN=
TEMPLATE=
TEMPLATE_BACKUP=
# Filter out some dnf options and collect packages list
while [ $# -gt 0 ]; do
    case "$1" in
        --enablerepo=*|\
        --disablerepo=*)
            ;;
        --clean)
            CLEAN=1
            ;;
        --gui)
            GUI=1
            ;;
        --check-only)
            CHECK_ONLY=1
            ;;
        --action=*)
            YUM_ACTION=${1#--action=}
            ;;
        -*)
            YUM_OPTS+=( "${1}" )
            ;;
        *)
            PKGS+=( "${1}" )
            if [ -z "$YUM_ACTION" ]; then
                YUM_ACTION=install
            fi
            ;;
    esac
    shift
done

# Prevent implicit update of template - this would override user changes -
# but do allow explicit template upgrade, downgrade, reinstall
if [ "$YUM_ACTION" == "reinstall" ] || [ "$YUM_ACTION" == "upgrade" ] || [ "$YUM_ACTION" == "upgrade-to" ] \
|| [ "$YUM_ACTION" == "downgrade" ] && find_regex_in_args '^qubes-template-' "${PKGS[@]}"; then
    TEMPLATE_EXCLUDE_OPTS=()
    echo "WARNING: Replacing a template will erase all files in template's /home and /rw !"

    # At least one package name matches the regex '^qubes-template-',
    # so if there is only one package name in the array, then the
    # code can safely assume that the array includes only a template
    # package name.
    if [[ ${#PKGS[@]} -eq 1 ]]; then
        ONEPKG="$(echo "${PKGS[0]}" | sed -r 's/-[0-9]+(\.[0-9-]+)+(\.noarch)*$//')" # Remove version suffix
        TEMPLATE=${ONEPKG#qubes-template-} # Remove prefix

        if qvm-shutdown --wait $TEMPLATE ; then
            echo "Template VM halted"
        fi

        # Try to avoid unrecoverable failures when operating on the template of
        # the UpdateVM by making a backup first.
        UPDATEVM_TEMPLATE=$(qvm-prefs -- "$UPDATEVM" template 2>/dev/null)
        if [ X"$UPDATEVM_TEMPLATE" = X"$TEMPLATE" ]; then
            TEMPLATE_BACKUP="${TEMPLATE}-backup-$(date +%Y%m%d)-$(mktemp -u XXXX)"
            TEMPLATE_BACKUP=${TEMPLATE_BACKUP:0:31}
            echo "Attempting to operate on template of UpdateVM... backing up $TEMPLATE to $TEMPLATE_BACKUP"
            if ! qvm-clone -- "$TEMPLATE" "$TEMPLATE_BACKUP"; then
                echo "ERROR: Unable to make backup of UpdateVM template!" >&2
                exit 1
            fi
        fi
    else
        echo "ERROR: Specify only one package to reinstall template"
        exit 1
    fi
elif [ "$YUM_ACTION" == "search" ] || [ "$YUM_ACTION" == "info" ]; then # No need to shutdown for search/info
    TEMPLATE_EXCLUDE_OPTS=()
else
    TEMPLATE_EXCLUDE_OPTS=( "--exclude=$(rpm -qa --qf '%{NAME},' qubes-template-\*|head -c -1)" )
fi

YUM_OPTS=( "${TEMPLATE_EXCLUDE_OPTS[@]}" "${YUM_OPTS[@]}" )
ALL_OPTS=( "${TEMPLATE_EXCLUDE_OPTS[@]}" "${ALL_OPTS[@]}" )

ID=$(id -ur)
if [ $ID != 0 -a -z "$GUI" -a -z "$CHECK_ONLY" ] ; then
    echo "This script should be run as root (when used in console mode), use sudo." >&2
    exit 1
fi

if [ "$GUI" == "1" -a ${#PKGS[@]} -ne 0 ]; then
    echo "ERROR: GUI mode can be used only for updates" >&2
    exit 1
fi

if [ "$GUI" == "1" ]; then
    apps="xterm konsole yumex apper gpk-update-viewer"

    if [ -n "$KDE_FULL_SESSION" ]; then
        apps="konsole xterm apper yumex gpk-update-viewer"
    fi

    guiapp=
    for app in $apps; do
        if type $app &>/dev/null; then
            guiapp=$app
            case $guiapp in
                apper) guiapp="apper --updates --nofork" ;;
                xterm) guiapp="xterm -e sudo dnf update" ;;
                konsole) guiapp="konsole --hold -e sudo dnf update" ;;
                *) guiapp=$app ;;
            esac
            break;
        fi
    done

    if [ -z "$guiapp" ]; then
        message1="You don't have any supported dnf frontend installed."
        message2="Install (using qubes-dom0-update) one of: $apps"

        if [ "$KDE_FULL_SESSION" ]; then
            kdialog --sorry "$message1<br/>$message2"
        else
            zenity --error --text "$message1\n$message2"
        fi

        exit 1
    fi
fi

if [ "$GUI" != "1" ]; then
    QVMRUN_OPTS=--nogui
fi

# Do not start VM automatically when running from cron (only checking for updates)
if [ "$CHECK_ONLY" == "1" ] && ! qvm-check -q --running $UPDATEVM > /dev/null 2>&1; then
    echo "ERROR: UpdateVM not running, not starting it in non-interactive mode" >&2
    exit 1
fi

if [ -n "$CLEAN" ]; then
    rm -f /var/lib/qubes/updates/rpm/*
    rm -f /var/lib/qubes/updates/repodata/*
fi
rm -f /var/lib/qubes/updates/errors

echo "Using $UPDATEVM as UpdateVM to download updates for Dom0; this may take some time..." >&2

# qvm-run by default auto-starts the VM if not running
qvm-run --nogui -q -u root $UPDATEVM 'mkdir -m 775 -p /var/lib/qubes/dom0-updates/' || exit 1
qvm-run --nogui -q -u root $UPDATEVM 'chown user:user /var/lib/qubes/dom0-updates/' || exit 1
qvm-run --nogui -q $UPDATEVM 'rm -rf /var/lib/qubes/dom0-updates/etc' || exit 1
tar c /var/lib/rpm /etc/yum.repos.d /etc/yum.conf /etc/dnf/dnf.conf 2>/dev/null | \
   qvm-run --nogui -q --pass-io "$UPDATEVM" 'LC_MESSAGES=C tar x -C /var/lib/qubes/dom0-updates 2>&1 | grep -v -E "s in the future"'

qvm-run $QVMRUN_OPTS --pass-io $UPDATEVM "script --quiet --return --command '/usr/lib/qubes/qubes-download-dom0-updates.sh --doit --nogui $(quote_args "${ALL_OPTS[@]}")' /dev/null"
RETCODE=$?
if [ "$CHECK_ONLY" == "1" ]; then
    exit $RETCODE
elif [ "$RETCODE" -ne 0 ]; then
    exit $RETCODE
fi
# Wait for download completed
while pidof -x qubes-receive-updates >/dev/null; do sleep 0.5; done

if [ -r /var/lib/qubes/updates/errors ]; then
    echo "*** ERROR while receiving updates:" >&2
    cat /var/lib/qubes/updates/errors >&2
    echo "--> if you want to use packages that were downloaded correctly, use dnf directly now" >&2
    exit 1
fi

if [ -z "$YUM_ACTION" ]; then
    YUM_ACTION=upgrade
fi

if [ ${#PKGS[@]} -gt 0 ]; then
    if [ -n "$TEMPLATE" ]; then
        TEMPLATE_NETVM=$(qvm-prefs --force-root $TEMPLATE netvm)
    fi

    dnf "${YUM_OPTS[@]}" $YUM_ACTION "${PKGS[@]}" ; RETCODE=$?

    if [ -n "$TEMPLATE_BACKUP" -a "$RETCODE" -eq 0 ]; then
        # Remove backup, if we made one. Better to do this only on success and
        # potentially leave extra backups around than do it on an exit trap and
        # clean up more reliably but potentially brick a system.
        qvm-remove -f -- "$TEMPLATE_BACKUP"
    fi

    if [ -n "$TEMPLATE" -a -n "$TEMPLATE_NETVM" -a x"$TEMPLATE_NETVM" != xNone ]; then
        if ! qvm-prefs --force-root -s $TEMPLATE netvm $TEMPLATE_NETVM; then
            echo "ERROR: NetVM setting could not be restored!" >&2
            exit 1
        fi
    fi
elif [ -f /var/lib/qubes/updates/repodata/repomd.xml ]; then
    # Above file exists only when at least one package was downloaded
    if [ "$GUI" == "1" ]; then
        # refresh packagekit metadata, GUI utilities use it
        pkcon refresh force
        $guiapp
    else
        dnf check-update
        if [ $? -eq 100 ]; then # Run dnf with options
            dnf "${YUM_OPTS[@]}" $YUM_ACTION
        fi
    fi
    dnf -q check-update && qvm-features dom0 updates-available ''
else
    qvm-features dom0 updates-available ''
    echo "No updates available" >&2
    if [ "$GUI" == "1" ]; then
        zenity --info --title='Dom0 updates' --text='No updates available'
    fi
fi