#!/bin/bash

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 yum 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 yum 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 yum 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="$YUM_OPTS $1"
            ;;
        *)
            PKGS="$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" ] && [[ "$PKGS" == *"qubes-template-"* ]]; then
    TEMPLATE_EXCLUDE_OPTS=""
    echo "WARNING: Replacing a template will erase all files in template's /home and /rw !"

    ONEPKG=`cut -f 1 -d ' ' <<<$PKGS`
    if [[ "$ONEPKG" == "qubes-template-"* ]] && [[ "$ONEPKG" == "${PKGS#\ }" ]]; then # test "$PKGS" minus space
        ONEPKG=`sed -r 's/-[0-9]+(\.[0-9-]+)+(\.noarch)*$//' <<<$ONEPKG` # Remove version suffix
        TEMPLATE=${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:0:32}
            echo "Attempting to operate on template of UpdateVM... backing up $TEMPLATE to $TEMPLATE_BACKUP"
            if ! qvm-clone -- "$TEMPLATE" "$TEMPLATE_BACKUP"; then
                echo "ERROR: Unable to make backup of UpdateVM template!" >&2
                exit 1
            fi
        fi
    else
        echo "ERROR: Specify only one package to reinstall template"
        exit 1
    fi
else
    TEMPLATE_EXCLUDE_OPTS="--exclude=`rpm -qa --qf '%{NAME},' qubes-template-\*`"
fi
YUM_OPTS="$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 [ "$GUI" == "1" -a -n "$PKGS" ]; 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 installed any supported yum frontend."
        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 automaticaly 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 $UPDATEVM 'rm -rf /var/lib/qubes/dom0-updates/etc' || exit 1
tar c /var/lib/rpm /etc/yum.repos.d /etc/yum.conf 2>/dev/null | \
   qvm-run --nogui --pass-io "$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 $ALL_OPTS' /dev/null"
RETCODE=$?
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 yum directly now" >&2
    exit 1
fi

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

if [ -n "$PKGS" ]; then
    if [ -n "$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 -- "$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 yum with options
            dnf $YUM_OPTS $YUM_ACTION
        fi
    fi
    dnf -q check-update && rm -f $UPDATES_STAT_FILE
else
    rm -f $UPDATES_STAT_FILE
    echo "No updates avaliable" >&2
fi