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pass sendmail a bad option so it errors (after telling us what we need to know) rather than doing any DNS lookups or any crap.

Should help when updating without internet.

#!/bin/sh
# $RedRiver: update_openbsd,v 1.33 2009/12/31 16:48:19 andrew Exp $

installed_sets() {
    local misc=/usr/share/doc/README
    local man=/usr/share/man/cat1/intro.0
    local comp=/usr/bin/cc
    local game=/usr/games/
    local xbase=/usr/X11R6/
    local xetc=/etc/X11/xinit/xinitrc
    local xfont=/usr/X11R6/lib/X11/fonts
    local xserv=/usr/X11R6/bin/X
    local xshare=/usr/X11R6/bin/startx

    local _c _d _e
    echo -n base
    echo -n ' etc'
    for _d in misc man comp game xbase xetc xfont xserv xshare; do
        eval _e=\$${_d}
        _c=`ls $_e 2> /dev/null | wc -l`
        #echo $_c $_d $_e
        if [ $_c -ne 0 ]; then
            echo -n " $_d"
        fi
    done

    sendmail -d0.1 --badoption </dev/null 2>/dev/null | grep -q SASL
    if [ $? == 0 ]; then 
        echo -n ' sendmail-smtp_auth'
    fi
}

version_in() {
        local _proto=${FTP%%://*}
        local _file

        if [ X"ftp" == X"${_proto}" ]; then
            local _list=`echo "ls base*.tgz" | ${FTP_CMD} ${FTP}/`
            _file=`echo ${_list} | awk '/base[0-9][0-9].tgz/ { print $9 }'`

        elif [ X"http" == X"${_proto}" ]; then
            local _list=`${FTP_CMD} -V -o - ${FTP}/`
            _file=`echo ${_list} | awk '/[^x]base[0-9][0-9]*\.tgz/ { 
                    sub("^.*base","base");
                    sub("\.tgz.*",".tgz"); 
                    print $0;
                }'`

        elif [ X"scp" == X"${_proto}" ]; then
            echo SCP is not yet supported >&2
            return 2

        else 
            echo Unsupported FTP ${FTP} >&2
            return 2

        fi

        local _v=${_file##*base}
        _v=${_v%.tgz*}
        echo $_v
}

set_version() {
    CUR_VER=`uname -r`
    NEW_VER=`dc -e "$CUR_VER 0.1 + p"`
    FILE_VER=""
    FTP=""

    local _cv=`echo $CUR_VER | sed -e 's/\.//'`
    local _nv=`echo $NEW_VER | sed -e 's/\.//'`
    local _v

    if [ X"No" != X"$FORCE_DIR" -a -d $FORCE_DIR ]; then
        _dir=$FORCE_DIR
        if [ -e ${_dir}/base${_nv}.tgz ]; then
            _v=$_nv
        elif [ -e ${_dir}/base${_cv}.tgz ]; then
            NEW_VER=$CUR_VER
            _v=$_cv
        fi

    elif [ -d $CUR_VER ]; then
        _dir=$CUR_VER
        NEW_VER=$CUR_VER
        if [ -e ${_dir}/base${_cv}.tgz ]; then
            _v=$_cv
        fi

    elif [ -d $NEW_VER ]; then
        _dir=$NEW_VER
        if [ -e ${_dir}/base${_nv}.tgz ]; then
            _v=$_nv
        fi

    fi

    if [ X"" != X"${MIRROR}" -a X"" == X"${_v}" ]; then
        if [ X"No" == X"${FORCE_DIR}" ]; then
            _dir=${NEW_VER}
        else
            _dir=${FORCE_DIR}
        fi
        FTP=${MIRROR}/${_dir}/`machine`

        _v=`version_in`

        if [ X"" == X"${_v}" ]; then
            if [ X"No" != X"$FORCE_DIR" ]; then
                echo No sets in forced [${FTP}] >&2
                return 2
            fi

            NEW_VER=$CUR_VER
            _dir=${NEW_VER}
            FTP=${MIRROR}/${_dir}/`machine`

            _v=`version_in`
        fi

        if [ X"" == X"${_v}" ]; then
            echo No sets in [${FTP}] >&2
            return 2 
        elif [ X"${_cv}" == X"${_v}" ]; then
            NEW_VER=$CUR_VER
        elif [ X"${_nv}" == X"${_v}" ]; then
            NEW_VER=$NEW_VER
        else
            echo Invalid version [$_v] >&2
            return 2
        fi

        if [ X"No" == X"$FORCE_DIR" ]; then
            _dir=$NEW_VER
        fi

    fi

    if [ X"" == X"${_v}" ]; then
        echo ERROR: Unable to determine file version! >&2
        return 1
    fi

    if [ X"" == X"$RELEASEDIR" ]; then
        RELEASEDIR=`pwd`/$_dir
    fi

    FILE_VER=$_v
    if [ X"" != X"${MIRROR}" ]; then
        FTP=${MIRROR}/${_dir}/`machine`
    fi
}

get_sets() {
    echo '### GETTING SETS ###'
    if [ X"" == X"$FTP" ]; then
        echo ERROR: No FTP site set! >&2
        return 1
    fi

    mkdir -p ${RELEASEDIR}
    cd $RELEASEDIR

    local _v=$FILE_VER

    for _b in `echo /bsd* bsd bsd.mp bsd.rd | sort -u`; do
        if [ -e /${_b} -a ! -e ./${_b} ]; then
            echo $FTP_CMD ${FTP}/${_b}
            $FTP_CMD ${FTP}/${_b}
        fi
    done

    for _s in $INSTALLED_SETS; do
        local _file=${_s}${_v}.tgz
        if [ ${_s} == sendmail-smtp_auth ]; then
            _file=${_s}.gz
        fi

        if [ ! -e ./${_file} ]; then
            echo $FTP_CMD ${FTP}/${_file}
            $FTP_CMD ${FTP}/${_file}
        fi
    done

    local _type
    for _type in $CHECKSUM_TYPES; do
        if [ ! -e $_type ]; then
            echo $FTP_CMD ${FTP}/$_type
            $FTP_CMD ${FTP}/$_type
        fi
    done
}

follow_symlink () {
    local _file=$1
    # This could go circular, but I dunno how to fix that.
    if [ -h $_file ]; then
        follow_symlink $( file $_file |
            grep 'symbolic link' | 
            sed -e s/^.*\\\`// -e s/\\\'\$// )
    else
        echo $_file
    fi
}

check_sum () {
    local _type=$1
    echo "### CHECKING $_type SUMS ###"
    cd $RELEASEDIR

    if [ ! -e $_type ]; then
        echo $_type File does not exist!
        return 1
    fi

    ls bsd* *gz | sed -e 's/\(.*\)/(\1)/' > index 
    grep -f index $_type | sum -c 

    if [ $? -ne 0 ]; then
        echo ERROR: $_type does not match! >&2
        return 1
    fi
}

check_sets() {
    echo '### CHECKING SETS ###'
    cd $RELEASEDIR

    local _missing_sets
    local _v=$FILE_VER

    for _b in `echo /bsd* bsd bsd.mp bsd.rd | sort -u`; do
	_b=${_b#/}
        local _n=$_b
        if [ X"bsd.sp" == X"${_n}" ]; then
            _n=bsd
        fi
        if [ -e /${_b} -a ! -e ./${_n} ]; then
            echo ${_n} does not exist
            _missing_sets=1
        fi
    done

    for _s in $INSTALLED_SETS; do
        local _file=${_s}${_v}.tgz
        if [ ${_s} == sendmail-smtp_auth ]; then
            _file=${_s}.gz
        fi
        if [ ! -e ./${_file} ]; then
            echo ${_file} does not exist
            _missing_sets=1
        fi
    done

    if [ X"" == X"${_missing_sets}" ]; then
        echo All OK
    fi

    local _type
    for _type in $CHECKSUM_TYPES; do
        if [ -e $_type ]; then
            check_sum $_type
        fi
    done
}


install_kernels() {
    echo '### INSTALLING KERNEL ###'
    if [ X"$USER" != X"root" -a X"$SUDO" == X"" ]; then
        echo ${0##*/} must be run as root or SUDO must be set! >&2
        exit 1
    fi

    if [ X"" == X"$RELEASEDIR" ]; then
        echo ERROR: no source for new kernels! >&2
        exit 1
    else
        cd $RELEASEDIR
    fi

    if [ ! -e bsd ]; then
        echo ERROR: new bsd kernel does not exist! >&2
        exit 1
    fi

    if [ -e /bsd.mp -a ! -e bsd.mp ]; then
        echo ERROR: new bsd.mp kernel does not exist! >&2
        exit 1
    fi

    if [ ! -e bsd.rd ]; then
        echo ERROR: new bsd.rd kernel does not exist! >&2
        exit 1
    fi

    local _v=$FILE_VER

    $SUDO rm -f /obsd
    $SUDO ln /bsd /obsd
    if [ $? -ne 0 ]; then
        echo "Error copying old kernel!" >&2
        exit 1
    fi

    local _true_bsd=`follow_symlink /bsd`
    _true_bsd=${_true_bsd#/}
    local _installed_new_bsd

    for _b in bsd*; do
        $SUDO rm -f /nbsd
        if [ X"${_b}" == X"bsd" ]; then
            echo Copying bsd to /bsd.sp
            $SUDO cp bsd /nbsd && $SUDO mv /nbsd /bsd.sp
            if [ $? -ne 0 ]; then
                echo ERROR: Could not copy new SP kernel! >&2
                exit 1
            fi
            if [ X"${_true_bsd}" == X"bsd.sp" ]; then
                _installed_new_bsd=1
            fi
        else
            if [ -e "/${_b}" ]; then
                echo Copying $_b to /
                $SUDO cp ${_b} /nbsd && $SUDO mv /nbsd /${_b}
                if [ $? -ne 0 ]; then
                    echo ERROR: Could not copy new $_b kernel! >&2
                    exit 1
                fi
                if [ X"${_true_bsd}" == X"${_b}" ]; then
                    _installed_new_bsd=1
                fi
            fi
        fi
    done

    if [ ! -h /bsd ]; then
        if [ -e /bsd.mp ]; then
            echo linking /bsd.mp to /bsd
            $SUDO ln -sf /bsd.mp /bsd
        else
            echo linking /bsd.sp to /bsd
            $SUDO ln -sf /bsd.sp /bsd
        fi
        if [ $? -ne 0 ]; then
            echo ERROR: Could not symlink new kernel! >&2
            exit 1
        fi
    fi

    if [ -z $_installed_new_bsd ]; then
        echo WARNING: Did not replace $_true_bsd kernel >&2
    fi
}

install_sets() {
    echo '### INSTALLING SETS ###'
    if [ X"$USER" != X"root" -a X"$SUDO" == X"" ]; then
        echo ${0##*/} must be run as root or SUDO must be set! >&2
        exit 1
    fi

    if [ X"" == X"$RELEASEDIR" ]; then
        echo ERROR: no source for sets! >&2
        exit 1
    else
        cd $RELEASEDIR
    fi

    local _v=$FILE_VER

    if [ $CUR_VER != $NEW_VER -a ! -e /sbin/oreboot ]; then
        $SUDO cp /sbin/reboot /sbin/oreboot
        if [ $? -ne 0 ]; then
            echo "Error copying old reboot command!" >&2
            exit 1
        fi
        echo "/sbin/reboot copied to /sbin/oreboot"
    fi

    local _sets=`ls *${_v}.tgz | grep -v ^base `
    for _f in ${_sets} base${_v}.tgz; do
        _path=$DESTDIR
        if [ X"etc${_v}.tgz"  == X"$_f" \
            -o X"xetc${_v}.tgz" == X"$_f" ]; then
            [ X"" != X"$SYSMERGE" ] && continue
            _path=/var/tmp/temproot
        fi

        echo Extracting $_f to $_path
        $SUDO mkdir -p $_path
        $SUDO tar -C $_path -xzphf ${RELEASEDIR}/${_f}
        if [ $? -ne 0 ]; then
            echo ERROR: Could not extract ${_f}! >&2
            exit 1
        fi
    done

    echo Extracted all sets.

    if [ -e ${RELEASEDIR}/sendmail-smtp_auth.gz ]; then
        gzcat ${RELEASEDIR}/sendmail-smtp_auth.gz > \
            ${RELEASEDIR}/sendmail-smtp_auth
    fi
    if [ -e ${RELEASEDIR}/sendmail-smtp_auth ]; then
        if ! pkg_info -qe 'cyrus-sasl-*'; then
            $SUDO pkg_add -i cyrus-sasl
        fi

        $SUDO install -o root -g smmsp -m 2555 \
            ${RELEASEDIR}/sendmail-smtp_auth \
            /usr/libexec/sendmail/sendmail

        echo Installed sendmail with smtp_auth
    fi
}

update_etc() {
    echo '### UPDATING ETC ###'
    if [ ! -e $SYSMERGE ]; then
        SYSMERGE=
    fi

    if [ X"" == X"$SYSMERGE" ]; then
        if [ -e /var/tmp/temproot ]; then
            MERGEMASTER=`which mergemaster`

            if [ $? != 0 ]; then
                $SUDO pkg_add -i mergemaster

                MERGEMASTER=`which mergemaster`
                if [ $? != 0 ]; then
                    echo ERROR: mergemaster not installed! >&2
                    exit 1
                fi
            fi

            echo '### RUNNING MERGEMASTER ###'
            $SUDO $MERGEMASTER -irv
        else 
            echo "ERROR: no source for etc!" >&2
            exit 1
        fi
    else
        if [ X"" == X"$RELEASEDIR" ]; then
            echo "ERROR: no source for etc!" >&2
            exit 1
        else
            cd $RELEASEDIR
        fi

        local _v=$FILE_VER
        local _args=""
        if [ -e etc${_v}.tgz ]; then
            _args="$_args -s etc${_v}.tgz"
        fi
        if [ -e xetc${_v}.tgz ]; then
            _args="$_args -x xetc${_v}.tgz"
        fi
        if [ X"" == X"$_args" ]; then 
            echo ERROR: No upgrade sets found! >&2
        else
            echo '### RUNNING SYSMERGE ###'
            if sysmerge 2>&1 | grep -- -a >/dev/null; then
                _args="-a $_args"
            fi
            $SUDO $SYSMERGE $_args
        fi
    fi
}


if [ -e /etc/update_openbsd.conf ]; then
    . /etc/update_openbsd.conf
fi

if [ -e ${HOME}/.update_openbsdrc ]; then
    . ${HOME}/.update_openbsdrc
fi

#MIRROR=${MIRROR:=ftp://ftp.openbsd.org/pub/OpenBSD}
FTP_CMD=${FTP_CMD:=ftp -V}
PKG_PATH=${PKG_PATH:=/usr/ports/packages/`machine`/all/:${MIRROR}/`uname -r`/packages/`machine`/}

DESTDIR=${DESTDIR:=/}
SYSMERGE=${SYSMERGE:=/usr/sbin/sysmerge}
FORCE_DIR=${FORCE_DIR:=No}

INSTALLED_SETS=${INSTALLED_SETS:=`installed_sets`}

CHECKSUM_TYPES=${CHECKSUM_TYPES:=SHA256 MD5}

set_version
local _error=$?

echo
echo "-= update_openbsd - helper script to update OpenBSD =-"
echo "------------------------------------------------------"
echo
echo "          SUDO: $SUDO"
echo "      SYSMERGE: $SYSMERGE"
echo "        MIRROR: $MIRROR"
echo "    RELEASEDIR: $RELEASEDIR"
echo "       DESTDIR: $DESTDIR"
echo "INSTALLED_SETS: $INSTALLED_SETS"
echo
echo "       CUR_VER: $CUR_VER"
echo "       NEW_VER: $NEW_VER"
#echo "      FILE_VER: $FILE_VER"
echo

if [ ${_error} -ne 0 ]; then
	exit ${_error}
fi

if [ X"" != X"${FTP}" ]; then
    get_sets
fi

check_sets || exit

if [ X"" != X"$SUDO" ]; then
    echo Please enter your sudo password if prompted.
    echo You may be asked for it again later in the process.
    $SUDO -v
fi

install_kernels
install_sets

if [ $CUR_VER == $NEW_VER ]; then
    if [ -e /sbin/oreboot ]; then
        echo Removing /sbin/oreboot
        $SUDO rm -f /sbin/oreboot
    fi
    update_etc

    echo '### UPDATING PACKAGES ###'
    $SUDO pkg_add -ui -F update -F updatedepends

else
    echo Instructions for updating to the new version available from 
    if [ X"snapshots" != X"$FORCE_DIR" ]; then
        echo "  http://www.openbsd.org/faq/current.html"
    else
        echo "  http://www.openbsd.org/faq/upgrade${FILE_VER}.html"
    fi
fi

echo New kernel installed.  Please reboot!
if [ -e /sbin/oreboot ]; then
    echo Possibly using /sbin/oreboot
fi

local _send_dmesg=`dirname $0`/send_dmesg 
if [ -e "$_send_dmesg" ]; then
    if [ -e $RELEASEDIR/.send_dmesg ]; then
        $_send_dmesg
        rm -f $RELEASEDIR/.send_dmesg
    elif [ X"$CUR_VER" != X"$NEW_VER" ]; then
        touch $RELEASEDIR/.send_dmesg
    fi
fi