#!/bin/bash

UPDATEVM=`qubes-prefs --get 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 "    <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=$*
# Filter out some yum options and collect packages list
while [ $# -gt 0 ]; do
    case "$1" in
        --enablerepo=*|\
        --disablerepo=*|\
        --clean)
            ;;
        --gui)
            GUI=1
            ;;
        --check-only)
            CHECK_ONLY=1
            ;;
        -*)
            YUM_OPTS="$YUM_OPTS $1"
            ;;
        *)
            PKGS="$PKGS $1"
            ;;
    esac
    shift
done

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

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

# We should ensure the clocks in Dom0 and UpdateVM are in sync
# becuase otherwise yum might complain about future timestamps
qvm-sync-clock

echo "Checking for dom0 updates" >&2

# Start VM if not running already
qvm-run -a $UPDATEVM true || exit 1

/usr/lib/qubes/qrexec_client -d "$UPDATEVM" -l 'tar c /var/lib/rpm /etc/yum.repos.d /etc/yum.conf 2>/dev/null' 'user:tar x -C /var/lib/qubes/dom0-updates' 2> /dev/null

qvm-run --pass-io $UPDATEVM "/usr/lib/qubes/qubes_download_dom0_updates.sh --doit --nogui $ALL_OPTS"
RETCODE=$?
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 [ "x$PKGS" != "x" ]; then
    yum $YUM_OPTS install $PKGS
elif [ -f /var/lib/qubes/updates/repodata/repomd.xml ]; then
    # Above file exists only when at least one package was downloaded
    if [ "$GUI" == "1" ]; then
        gpk-update-viewer
    else
        yum check-update
        if [ $? -eq 100 ]; then
            yum $YUM_OPTS update
        fi
    fi
    yum -q check-update && rm -f $UPDATES_STAT_FILE
else
    echo "No updates avaliable" >&2
fi