#!/bin/bash

# vim:expandtab:shiftwidth=4:softtabstop=4:tabstop=4:

# this is an alternative FD for stdout, to be used especially when we are
# taking stdout from a function as it's return value.  i.e. foo=$(bar)
# this is a workaround until a version of bash where we can put xtrace
# on a specific FD
exec 3>&1; STDOUT=3

#set -x
xtrace="+x"
if [[ $SHELLOPTS = *xtrace* ]]; then
    xtrace="-x"
fi
shopt -s extdebug

# include the exit_traps library
. ${0%/lbuild}/exit_traps.sh

# our children should die when we do
push_exit_trap "kill -INT -$$ || true" kill_children

TOPDIR=$PWD

# CVSROOT is inherited from the environment
KERNELDIR=
LINUX=
LUSTRE=
RELEASE=false
# XXX - some recent hacking has pretty much neutered this option.
#       search through this file (and lbuild.old_school -- but that will
#       be going away soon) for "-bb" and see how many places
#       simply don't account for this option
DO_SRC=true
DOWNLOAD=true
TAG=
CANONICAL_TARGET=
TARGET=
TARGET_ARCH=$(uname -m)
TARGET_ARCHS=
TARGET_ARCHS_ALL=$TARGET_ARCH
[ "$TARGET_ARCH" = "i686" ] && TARGET_ARCHS_ALL="i686 i586 i386"
CONFIGURE_FLAGS=
EXTERNAL_PATCHES=
EXTRA_VERSION=
LUSTRE_EXTRA_VERSION=
STAGEDIR=
TMPDIR=${TMPDIR:-"/var/tmp"}
TIMESTAMP=
# XXX - i think these two parameters/arguments/variables need to be
#       cleaned up and merged.  they effectively do the same thing
REUSERPM=
REUSEBUILD=
# what does this do exactly?  does it imply no kernel build?
NORPM=false
LDISKFSRPM=true
SKIPLDISKFSRPM="v1_4_* b1_4"
SMPTYPES="smp bigsmp default ''"
PATCHLESS=false
XEN=false
LINUXOBJ=
DISTRO=
KERNELTREE=
# default to not adding -lustre- into the kernel RPM package names
KERNEL_LUSTRE_NAMING=false

# patchless build
KERNELRPMSBASE=
RPMSMPTYPE=

# from target file
SERIES=
BASE_ARCHS=
BIGMEM_ARCHS=
BOOT_ARCHS=
JENSEN_ARCHS=
SMP_ARCHS=
BIGSMP_ARCHS=
PSERIES64_ARCHS=
UP_ARCHS=

# not in the target file any more
CONFIG=

DATE=$(date)

USE_DATESTAMP=1
RPMBUILD=

OLD_SCHOOL=false

export CC=${CC:-gcc}

# Readlink is not present on some older distributions: emulate it.
readlink() {
    local path=$1 ll

    if [ -L "$path" ]; then
        ll="$(LC_ALL=C ls -l "$path" 2> /dev/null)" &&
        echo "${ll/* -> }"
    else
        return 1
    fi
}

cleanup() {

    true
}

error() {
    local msg="$1"

    [ -n "$msg" ] && echo -e "\n${0##*/}: $msg" >&3

}

fatal() {

    cleanup
    error "$2"
    exit $1

}

usage() {
    cat <<EOF
Usage: ${0##*/} [OPTION]... [-- <lustre configure options>]

  -d CVSROOT
    Specifies the CVS Root to use when pulling files from CVS.  The
    environment variable \$CVSROOT is used if this option is not
    present.

  --external-patches=EXTERNAL_PATCHES
    Directory similar to lustre/lustre/kernel_patches/ that lbuild should
    look for seres and config files in before looking in the lustre
    tree.

  --extraversion=EXTRAVERSION
    Text to use for the rpm release and kernel extraversion.

  --timestamp=TIMESTAMP
    Date of building lustre in format YYYYMMDDhhmmss

  --reuserpm=DIR
    Try to reuse old kernel RPMs from DIR

  --reusebuild=DIR
    Try to reuse old kernel builds from DIR

  --kernelrpm=DIR
    Path to distro kernel RPM collection

  --ccache
    Use ccache

  --norpm
    Do not build RPMs (compile only mode)

  --patchless
    Build lustre client only

  --distro=DISTRO
    Which distro using. Autodetect by default

  --kerneldir=KERNELDIR
    Directory containing Linux source tarballs referenced by target
    files.

  --kerneltree=KERNELTREE
    Directory containing dirs with Linux source tarballs referenced by target
    files. Dir names in format kernel version ('2.6.9', etc.)

  --linux=LINUX --with-linux=LINUX
    Directory of Linux kernel sources.  When this option is used, only
    Lustre modules and userspace are built.

  --lustre=LUSTRE
    Path to an existing lustre source tarball to use instead of
    pulling from CVS.

  --nodownload
    Do not try to download a kernel from downloads.lustre.org

  --nosrc
    Do not build a .src.rpm, a full kernel patch, or a patched kernel
    tarball.

  --ldiskfs
    Do ldiskfs RPM. Now true by default

  --publish
    Unused.

  --release
    Specifies that the files generated do not include timestamps, and
    that this is an official release.

  --src
    Build a .src.rpm, a full kernel patch, and a patched kernel tarball.

  --stage=DIR
    Directory used to stage packages for release.  RPMs will be placed
    more or less in DIR/<target>-<arch>, and the tarball will be
    placed in DIR.

  --tag=TAG
    A CVS branch/tag name to build from when pulling from CVS.

  --target=TARGET
    The name of the target to build.  The available targets are listed
    below.

  --target-archs=TARGET_ARCHS
    A (space delimited) list of architectures to build.  By default,
    all of the archs supported by the TARGET will be built, in
    addition to a .src.rpm.  This option can limit those, for machines
    that can only build certain archs or if you only want a certain
    arch built (for testing, or a one-off kernel).

    Also note that by using a non-"base" arch (eg, i386) only kernels
    will be built - there will be no lustre-lite-utils package.

  --disable-datestamp
    Prevents the datestamp flag (-D) from being passed to cvs for
    checkouts. This is a workaround for a problem encountered when
    using lbuild with tinderbox.

  --xen
    Builds a Xen domX kernel.

EOF

#   list_targets

    fatal "$1" "$2"
}

# canonicalize a relative path
canon_path() {
    local PATH="$1"

    if [ ! -d "$PATH" ]; then
        return 1
    fi

    pushd "$PATH" >/dev/null || return 1
    local CANONPATH=$PWD
    popd >/dev/null

    echo "$CANONPATH"
    return 0
}

check_options() {

    if [ "$LUSTRE" ]; then
        [ -r "$LUSTRE" ] || \
            usage 1 "Could not find Lustre source tarball '$LUSTRE'."
    else
        [ "$CVSROOT" ] || \
            usage 1 "Either specify a CVS Root with -d, or a Lustre source tarball with --lustre."
        [ "$TAG" ] || \
            usage 1 "A branch/tag name must be specified with --tag when not building from a tarball."
    fi

    if [ -z "$LINUX" ]; then
        [ "$KERNELDIR" -o "$KERNELTREE" ] || \
            usage 1 "A kernel directory must be specified with --kerneldir or --kerneltree."

        [ -d "$KERNELDIR" -o -d "$KERNELTREE" ] || \
            usage 1 "$KERNELDIR and $KERNELTREE are not a directory."

        if ! $RELEASE; then
            [ "$TAG" ] || \
                usage 1 "When building a snapshot, a tag name must be used."
        fi

        [ "$TARGET" ] || usage 1 "A target must be specified with --target."
#       TARGET_FILE="$TOPDIR/lustre/kernel_patches/targets/$TARGET.target"
#       [ -r "$TARGET_FILE" ] || \
#               usage 1 "Target '$TARGET' was not found."
    fi

    case $TARGET in
        2.6-rhel5)
            CANONICAL_TARGET="rhel5"
            ;;
        2.6-rhel4)
            CANONICAL_TARGET="rhel-2.6"
            ;;
        2.6-suse)
            CANONICAL_TARGET="sles-2.6"
            ;;
        2.6-sles10)
            CANONICAL_TARGET="sles10-2.6"
            ;;
        2.6-sles11)
            CANONICAL_TARGET="sles11"
            ;;
        2.6-oel5)
            CANONICAL_TARGET="oel5"
            ;;
        hp_pnnl-2.4)
            CANONICAL_TARGET="hp-pnnl-2.4"
            ;;
        2.6-vanilla \
            | suse-2.4.21-2 \
            | rh-2.4 \
            | rhel-2.4 \
            | sles-2.4 \
            | 2.6-patchless)
                CANONICAL_TARGET="$TARGET"
                ;;
    esac

    local timestampnodig=$(echo $TIMESTAMP | sed -e s/[0-9]*//g)
    [ "$timestampnodig" = "" ] || TIMESTAMP=$(date -d "$DATE" "+%Y%m%d%H%M%S")
    local timestamplength="${#TIMESTAMP}"
    if [ $timestamplength -eq 12 ]; then
        TIMESTAMP="${TIMESTAMP}00"
    elif [ $timestamplength -ne 14 ]; then
        TIMESTAMP=$(date -d "$DATE" "+%Y%m%d%H%M%S")
    fi

    RPMBUILD=$(which rpmbuild 2>/dev/null | head -1)
    if [ ! "$RPMBUILD" -o "$RPMBUILD" == "" ]; then
        RPMBUILD=$(which rpm 2>/dev/null | head -1)
        if [ ! "$RPMBUILD" -o "$RPMBUILD" == "" ]; then
            usage 1 "Could not find binary for making rpms (tried rpmbuild and rpm)."
        fi
    fi

    if [ -n "$CCACHE" ]; then
        which "$DISTCC" &>/dev/null && export DISTCC RPM_BUILD_NCPUS

        if which "$CCACHE" &>/dev/null; then
            local ccache=$(which "$CCACHE")
            local bindir="$TOPDIR/bin"

            if [ ! -d $bindir ]; then
                mkdir -p $bindir || fatal 1 "error trying to create $bindir"
            else
                rm ${bindir}/* > /dev/null 2>&1 || true
            fi
            ln -s "$ccache" ${bindir}/ccache
            ln -s "$ccache" ${bindir}/cc
            ln -s "$ccache" ${bindir}/$CC
            export PATH=$bindir:$PATH
            export CCACHE && export CC="ccache $CC"
            # zero the cache so we can see how effective we are being with it
            echo -n "ccache "
            ccache -z

            # get some ccache stats when we are done
            push_exit_trap '[ -n "$CCACHE" ] && ccache -s' "ccache_summary"
            # should remove the ccache trap if lbuild is interrupted
            trap 'echo "Received an INT TERM or HUP signal, terminating."; delete_exit_trap "ccache_summary"; exit 1' INT TERM HUP
        fi
    fi

    [ -z "$DISTRO" ] && DISTRO=$(autodetect_distro)

    return 0

}

# autodetect used Distro
autodetect_distro() {

    local name
    local version

    if [ -f /etc/SuSE-release ]; then
        name=sles
        version=$(grep ^VERSION /etc/SuSE-release)
        version=${version#*= }
    elif [ -f /etc/redhat-release ]; then
        name=$(head -1 /etc/redhat-release)
        version=$(echo "$distroname" |
                  sed -e 's/^[^0-9.]*//g' | sed -e 's/[ \.].*//')
    fi
    if [ -z "$name" -o -z "$version" ]; then
        fatal 1 "I don't know how to determine distro type/version.\nEither update autodetect_distro() or use the --distro argument"
    fi

    echo ${name}${version}
    return 0

}

uniqify() {

    echo $(echo "$*" | xargs -n 1 | sort -u)

}

download_srpm() {
    local target=$1
    local srpm=$2
    local force="${3:-false}"

    if $force || [ ! -r "$KERNELDIR/$srpm" ] ||
       [ ! -s "$KERNELDIR/$srpm" ]; then
        if $DOWNLOAD; then
            local location="http://downloads.lustre.org/public/kernels/$target/old"
            echo "Downloading $location/$srpm..."
            if ! wget -nv "$location/$srpm" -O "$KERNELDIR/$srpm" 2>&1 ||
               [ ! -s "$KERNELDIR/$srpm" ]; then
                rm -f $KERNELDIR/$srpm
                fatal 1 "Could not download target $target's kernel SRPM $srpm from $location."
            fi
        else
            fatal 1 "$srpm not found in directory $KERNELDIR."
        fi
    fi

}

download_file() {
    local from="$1"
    local to="$2"
    local force="$3"

    local file=${from##*/}

    if [ -d $to ]; then
        to="$to/$file"
    fi

    local semaphore="$to-downloading"

    is_downloading() {
        if [ ! -f $semaphore ]; then
            return 1
        fi

        # make sure the download has not been aborted
        local now=$(date +%s)
        local file_mtime=$(stat -c %Y "$to")
        local staleness=$((now - file_mtime))
        # let's assume an active download will write at least once a minute
        if [ $staleness -gt 60 ]; then
            return 1
        fi

        return 0
    }

    is_downloaded() {
        # if the semaphore file exists, the file is either still downloading
        # or a download was aborted and we cannot trust the target file
        if [ -f $semaphore ]; then
            return 1
        fi

        if ! is_downloading && [ -r "$to" ] && [ -s "$to" ]; then
            return 0
        fi

        return 1
    }

    if $force || ! is_downloaded; then
        if is_downloading; then
            echo "Somebody else is downloading $from..."
            while is_downloading; do
                echo "Waiting for $to to finish downloading"
                sleep 60
            done
            if is_downloaded; then
                return 0
            else
                echo "The download we were waiting for seems to have been aborted"
            fi

        fi

        if $DOWNLOAD; then
            echo "Downloading $from..."
            # flag others so they don't try to download also
            push_exit_trap "rm -f $to $semaphore" "download"
            touch $semaphore
            if ! wget -nv "$from" -O "$to" || [ ! -s "$to" ]; then
                # the trap will remove the files via the fatal below
                fatal 1 "Could not download ${to##*/} from ${from%%/*}/."
            fi
            rm -f $semaphore
            delete_exit_trap "download"
        else
            fatal 1 "${to##*/} not found in directory ${to%/*}."
        fi
    fi

    return 0

}

download_ofed() {
    local force="${1:-false}"

    local location="http://downloads.lustre.org/public/OFED/"

    local Mmv daily
    if [[ $OFED_VERSION = daily-* ]]; then
        OFED_VERSION=${OFED_VERSION/daily-/}
        Mmv=${OFED_VERSION%%-*}
        daily=${OFED_VERSION##$Mmv-}
        location="http://www.openfabrics.org/downloads/OFED/ofed-${Mmv}-daily/"
        # find the filename for the version for the date specified
        OFED_VERSION=$(curl -s "$location" | sed -nre "/${daily}-/s/.*href=\"OFED-([0-9]+\.[0-9]+-${daily}-[0-9]{4,4}).tgz.*$/\1/p" | tail -1)
        if [ -z "$OFED_VERSION" ]; then
            fatal 1 "Could not determine the filename of the OFED snapshot for ${daily}"
        fi
    fi

    if [ -z "$OFED_VERSION" -o "$OFED_VERSION" = "inkernel" ]; then
        return 0
    fi

    local file="OFED-${OFED_VERSION}.tgz"
    download_file "$location/$file" "$KERNELTREE" "$force"

}

download_rdac() {
    local force="${1:-false}"

    local location="http://downloads.lustre.org/public/RDAC/"

    if [ -z "$RDAC_VERSION" -o "$RDAC_VERSION" = "inkernel" ]; then
        return 0
    fi

    local file="rdac-LINUX-${RDAC_VERSION}-source.tar.gz"
    download_file "$location/$file" "$KERNELTREE" "$force"

}

download_mptlinux() {
    local force="${1:-false}"

    local location="http://downloads.lustre.org/public/MPTLINUX/"

    if [ -z "$MPTLINUX_VERSION" -o "$MPTLINUX_VERSION" = "inkernel" ]; then
        return 0
    fi

    file="MPTLINUX_RHEL5_SLES10_PH15-${MPTLINUX_VERSION}.zip"
    download_file "$location/$file" "$KERNELTREE" "$force"

}

load_target() {

    EXTRA_VERSION_save="$EXTRA_VERSION"
    for patchesdir in "$EXTERNAL_PATCHES" \
                      "$TOPDIR/lustre/lustre/kernel_patches"; do
        TARGET_FILE="$patchesdir/targets/$TARGET.target"
        [ -r "$TARGET_FILE" ] && break
    done
    [ -r "$TARGET_FILE" ] || fatal 1 "Target $TARGET was not found."

    echo "Loading target config file $TARGET.target..."

    # if the caller specified an OFED_VERSION it should override whatever
    # the target file specifies
    local env_OFED_VERSION="$OFED_VERSION"

    . "$TARGET_FILE"

    if [ -n "$env_OFED_VERSION" ]; then
        OFED_VERSION="$env_OFED_VERSION"
    fi

    # doesn't make any sense to build OFED for xen domX's
    if $XEN; then
        OFED_VERSION=""
    fi

    # XXX - set_rpm_smp_type is an ugly undeterministic hack.  it needs to
    #       go away and the target just specify the $RPMSMPTYPE
    [ -z "$RPMSMPTYPE" ] && set_rpm_smp_type

    # CC might have been overwriten in TARGET_FILE
    if [[ $CC != ccache\ * ]] && which "$CCACHE" &>/dev/null; then
        export CCACHE && export CC="ccache $CC"
    fi

    if [ ! "$KERNELTREE" = "" ] && [ -d "$KERNELTREE" ]; then
        KERNELDIR="$KERNELTREE/${lnxmaj}"
        [ -d "$KERNELDIR" ] || mkdir "$KERNELDIR"
    fi

    # verify the series is available
    if [ "$SERIES" ]; then
        for series in $SERIES; do
            for patchesdir in "$EXTERNAL_PATCHES" "$TOPDIR/lustre/lustre/kernel_patches"; do
                [ -r "$patchesdir/series/$series" ] && continue 2
            done
            fatal 1 "Target $TARGET's series $SERIES could not be found.\nSearched:\n\t$EXTERNAL_PATCHES/series\n\t$TOPDIR/lustre/lustre/kernel_patches/series."
        done
    fi

    # set the location of the .config file
    local XENPOSTFIX=""
    if $XEN; then
        XENPOSTFIX="-xen"
    fi

    if [ -f $TOPDIR/lustre/lustre/kernel_patches/kernel_configs/kernel-$lnxmaj-$TARGET-$TARGET_ARCH.config ]; then
        CONFIG_FILE="$TOPDIR/lustre/lustre/kernel_patches/kernel_configs/kernel-$lnxmaj-$TARGET$XENPOSTFIX-$TARGET_ARCH${RPMSMPTYPE:+-}${RPMSMPTYPE}.config"
    fi

    local lnxrelnew=${lnxrel//-/_}

    # remember the EXTRA_VERSION before we diddle it here
    # XXX - we really should not diddle with any values read in from the
    #       target file.  if we want to modify a value, we should create
    #       a new variable.
    PRISTINE_EXTRA_VERSION=$EXTRA_VERSION

    if ! $PATCHLESS && [ ! -f "$CONFIG_FILE" ]; then
        fatal 1 "Config file for target $TARGET missing from $TOPDIR/lustre/lustre/kernel_patches/kernel_configs/."
    fi

    if [ "$EXTRA_VERSION_save" ]; then
        EXTRA_VERSION="$EXTRA_VERSION_save"
    elif ! $RELEASE; then
        # if there is no patch series, then this is not a lustre specific
        # kernel.  don't make it look like one
        if [ -n "$SERIES" ]; then
            #remove the @VERSION@ (lustre version)
#            EXTRA_VERSION=$(echo $EXTRA_VERSION | sed -e "s/\(.*_lustre\)\..*/\1/")
#            EXTRA_VERSION="${EXTRA_VERSION}-${TAG}.${TIMESTAMP}"
            ! ( $PATCHLESS ) && EXTRA_VERSION="${EXTRA_VERSION}.${TIMESTAMP}"
        fi
    fi
    # EXTRA_VERSION=${EXTRA_VERSION//-/_}

    ALL_ARCHS="$BASE_ARCHS $BIGMEM_ARCHS $BOOT_ARCHS $JENSEN_ARCHS $SMP_ARCHS $BIGSMP_ARCHS $PSERIES64_ARCHS $UP_ARCHS"

    BUILD_ARCHS=
    for arch in $(uniqify "$ALL_ARCHS"); do
        if [ -z "$TARGET_ARCHS" ] ||
           [[ \ $TARGET_ARCHS\  = *\ $arch\ * ]]; then
            BUILD_ARCHS="$BUILD_ARCHS $arch"
        fi
    done
    [ "$BUILD_ARCHS" ] || usage 1 "No available target archs to build."
    echo "Building for: $BUILD_ARCHS"
}

tarflags() {
    local file="$1"

    case "$file" in
        '')
            fatal 1 "tarflags(): File name argument missing."
            ;;
        *.tar.gz | *.tgz)
            echo 'zxf'
            ;;
        *.tar.bz2)
            echo 'jxf'
            ;;
        *.tar)
            echo 'xf'
            ;;
        *)
            fatal 1 "tarflags(): Unrecognized tar extension in file: $1"
            ;;
    esac

}

untar() {
    local file="$1"

    echo "Untarring ${file##*/}..."
    tar $(tarflags "$file") "$file"

}

unpack_ofed() {

    if ! untar "$KERNELTREE/OFED-${OFED_VERSION}.tgz"; then
        return 1
    fi
    [ -d OFED ] || ln -sf OFED-[0-9].[0-9]* OFED

}

unpack_rdac() {

    if ! untar "$KERNELTREE/rdac-LINUX-${RDAC_VERSION}-source.tar.gz"; then
        return 1
    fi
    [ -d rdac-LINUX ] || ln -sf rdac-LINUX-[0-9][0-9].* rdac-LINUX

}

unpack_mptlinux() {

    if ! unzip -p $KERNELTREE/MPTLINUX_RHEL5_SLES10_PH15-4.16.00.00-2.zip | tar xzvf - srpms-2/mptlinux-4.16.00.00-2.src.rpm; then
        return 1
    fi
    mv srpms-2/mptlinux-4.16.00.00-2.src.rpm .

}

unpack_lustre() {

    if [ -z "$LUSTRE" ]; then
        local DATESTAMP=""

        if [ -n "$USE_DATESTAMP" ]; then
            DATESTAMP="-D '$DATE'"
        fi

        local DIRNAME="lustre-$TAG-$TIMESTAMP"

        cvs -d "$CVSROOT" -qz3 co $DATESTAMP -d "$DIRNAME" lustre || \
            fatal 1 "There was an error checking out toplevel Lustre from CVS."
        pushd "$DIRNAME" > /dev/null
        ./lustrecvs "$TAG" || \
            fatal 1 "There was an error checking out Lustre/Portals/Build from CVS."
        echo "Creating lustre tarball..."
        sh autogen.sh || fatal 1 "There was an error running autogen.sh."
        ./configure --disable-{modules,utils,liblustre,tests,doc} || \
            fatal 1 "There was an error running ./configure to create makefiles."
        make dist || fatal 1 "There was an error running 'make dist'."
        LUSTRE=$PWD/lustre-*.tar.gz
        popd > /dev/null
    fi

    untar "$LUSTRE" || fatal 1 "Error unpacking Lustre tarball"
    [ -d lustre ] || ln -sf lustre-[0-9].[0-9]* lustre

}

do_patch_linux() {

    local do_patch=${1:-true}

    FULL_PATCH="$PWD/lustre-kernel-${TARGET}${EXTRA_VERSION_DELIMITER}${EXTRA_VERSION}.patch"
    [ -f "$FULL_PATCH" ] && rm -f "$FULL_PATCH"
    $do_patch && pushd linux >/dev/null
    for series in $SERIES; do
        echo -n "Applying series $series:"
        for patchesdir in "$EXTERNAL_PATCHES" "$TOPDIR/lustre/lustre/kernel_patches"; do
            [ -r "$patchesdir/series/$series" ] || continue
            SERIES_FILE="$patchesdir/series/$series"
            for patch in $(<"$SERIES_FILE"); do
                echo -n " $patch"
                PATCH_FILE="$patchesdir/patches/$patch"
                [ -r "$PATCH_FILE" ] || \
                    fatal 1 "Patch $patch does not exist in Lustre tree."
                cat "$PATCH_FILE" >> "$FULL_PATCH" || {
                    rm -f $FULL_PATCH
                    fatal 1 "Error adding patch $patch to full patch."
                }
                if $do_patch; then
                    patch -s -p1 < "$PATCH_FILE" 2>&1 || {
                        rm -f $FULL_PATCH
                        fatal 1 "Error applying patch $patch."
                    }
                fi
            done
            break
        done
        echo
    done
    $do_patch && popd >/dev/null
    echo "Full patch has been saved in ${FULL_PATCH##*/}."

}

build_lustre() {
    local linux="$1"
    local linuxobj="$2"

    cp "$LUSTRE" SOURCES

    pushd lustre >/dev/null

    echo "Building Lustre RPMs for: $BUILD_ARCHS..."
    local targets arch
    for arch in $BUILD_ARCHS; do
        targets="--target $arch $targets"
    done

    local confoptions="--with-linux=${linux}"
    if $PATCHLESS; then
        confoptions="--with-linux=${linux} --disable-server"
    fi
    if [ "$linuxobj" != "" ]; then
        confoptions="$confoptions --with-linux-obj=${linuxobj}"
    fi

    ./configure $confoptions ${CONFIGURE_FLAGS} 2>&1
    if [ "$?" != "0" ]; then
        local saved_config="../config.log.$(date +%s)"
        cp config.log $saved_config
        chmod a+r $saved_config
        echo "Saved config.log is at $saved_config"
        cat /proc/mounts
        ls -l /proc/$$
        pwd
        echo "config.log contents:"
        cat config.log
        popd
        return 255
    fi

    gen_lustre_version

    # hack. Somebody move build/lustre.spec to lustre.spec for b1_6
    local lustre_spec
    [ -f lustre.spec ] && lustre_spec=lustre.spec
    [ -f build/lustre.spec ] && lustre_spec=build/lustre.spec

    [ -f "$lustre_spec" ] && sed \
        -e "s^Release: .*$^Release: $LUSTRE_EXTRA_VERSION^" \
        < $lustre_spec \
        > ../lustre.spec

    local rpmbuildopt='-bb'
    if $NORPM; then
        rpmbuildopt='-bc'
        echo NORPM mode. Only compiling.
    fi

    # convert the $PATCHLESS boolean to an empty/no-empty boolean
    # as silly as this seems, it makes the syntax of the rpmbuild command
    # simpler and not need an eval to deal with the quotes in the quotes
    local is_patchless=""
    if $PATCHLESS; then
        is_patchless="yes"
    fi
    $RPMBUILD $targets $rpmbuildopt ../lustre.spec \
        ${is_patchless:+--define "lustre_name lustre-client"} \
        --define "_tmppath $TMPDIR" \
        --define "_topdir $TOPDIR" 2>&1 || \
        fatal 1 "Error building rpms for $BUILD_ARCHS."

    popd >/dev/null
    ( $(skeep_ldiskfs_rpm $TAG) ) && return

    pushd lustre/ldiskfs || return 255
    make dist 2>&1
    if [ "$?" != "0" ]; then
        popd
        return 255
    fi
    cp lustre-ldiskfs*.tar.gz $TOPDIR/SOURCES

    gen_lustre_version

    local ldiskfs_spec=lustre-ldiskfs.spec
    [ -f "$ldiskfs_spec" ] && sed \
    -e "s^Release: .*$^Release: $LUSTRE_EXTRA_VERSION^" \
    < $ldiskfs_spec \
    > ../lustre-ldiskfs.spec

    if ! $RPMBUILD $targets $rpmbuildopt ../lustre-ldiskfs.spec \
        --define "_tmppath /var/tmp" \
        --define "_topdir $TOPDIR" 2>&1; then
        popd
        return 255
    fi

    if $DO_SRC; then
        if ! $RPMBUILD -bs ../lustre-ldiskfs.spec \
            --define "_tmppath /var/tmp" \
            --define "_topdir $TOPDIR" 2>&1; then
            popd
            return 255
        fi
    fi
    popd

}

stage() {

    [ "$STAGEDIR" ] || return 0

    for arch in $BUILD_ARCHS; do
        rpmdir="${STAGEDIR}/${CANONICAL_TARGET}-${arch}"
        echo "${0##*/}: Copying RPMs into ${rpmdir}"
        mkdir -p "${rpmdir}"
        cp -v RPMS/${arch}/*.rpm "${rpmdir}"
        if [ -d RPMS/noarch ]; then
            cp -v RPMS/noarch/*.rpm "${rpmdir}"
        fi
    done

    cp -v "$LUSTRE" "$STAGEDIR"

}

#check if we need to build separate ldiskfs RPM
skeep_ldiskfs_rpm() {
        local tag="$1"

        local skip=false

        if ! $LDISKFSRPM; then
            skip=true
        elif $PATCHLESS; then
            skip=true
        else
            for skiptag in $SKIPLDISKFSRPM; do
                [[ $tag == $skiptag ]] && skip=true && break
            done
        fi

        pushd $TOPDIR/BUILD/lustre-[1-9]* >/dev/null
        grep -q '^SERVER_TRUE[ \t]=[ \t]#$' autoMakefile && skip=true
        popd >/dev/null

        echo $skip

}

#generate LUSTRE_EXTRA_VERSION from EXTRA_VERSION
gen_lustre_version() {

    LUSTRE_EXTRA_VERSION="${lnxmaj}${EXTRA_VERSION_DELIMITER}${EXTRA_VERSION}${TARGET_DELIMITER}${RPMSMPTYPE}"
    LUSTRE_EXTRA_VERSION=${LUSTRE_EXTRA_VERSION//-/_}

}

set_rpm_smp_type() {

    local infact_arch="${TARGET_ARCH}"

    RPMSMPTYPE=""
    [ "$infact_arch" == "i586" ] && infact_arch="i686"

    local smp_type
    for smp_type in $SMP_ARCHS; do
        [ $infact_arch == $smp_type ] && RPMSMPTYPE=smp && break
    done

    for smp_type in $BIGSMP_ARCHS; do
        [ $infact_arch == $smp_type ] && RPMSMPTYPE=bigsmp && break
    done

    for smp_type in $DEFAULT_ARCHS; do
        [ $infact_arch == $smp_type ] && RPMSMPTYPE=default && break
    done

}

# This function takes a linux source pool and digs out the linux release
# from it
find_linux_release() {
    local SRCDIR="$1"

    local LINUXRELEASEHEADER=$SRCDIR/include/linux/version.h
    if [ -s $SRCDIR/include/linux/utsrelease.h ]; then
        LINUXRELEASEHEADER=$SRCDIR/include/linux/utsrelease.h
    fi

    sed -ne 's/#define UTS_RELEASE "\(.*\)"$/\1/p' $LINUXRELEASEHEADER

}

# XXX this needs to be re-written as a wrapper around find_rpm
#     or just gotten rid of.  :-)
find_linux_rpm() {
    local prefix="$1"
    local delimiter=${2:-"-"}

    local pathtorpms="${KERNELRPMSBASE}/${lnxmaj}/${DISTRO}"
    [ -d $pathtorpms ] || return 255

    local kernelbinaryrpm rpmfile
    local wanted_kernel="${lnxmaj}${delimiter}${lnxrel}"

    local arch ret=1
    for arch in $TARGET_ARCHS_ALL; do
        local found_rpm="" rpm
        for rpm in ${pathtorpms}/${arch}/*.rpm; do
            if rpm -q --provides -p "$rpm" 2>&3 | grep -q "kernel${prefix} = $wanted_kernel" 2>&3; then

                found_rpm="$rpm"
                ret=0
                break
            fi
        done
        [ -f "$found_rpm" ] && break
    done

    echo "$found_rpm"
    return $ret

}

# unpack kernel(/source/devel) RPM
#
# This function and it's setting of $LINUX and $LINUXOBJ is a total hack that
# needs to completely refactored.  It completely ingores that $BUILD_ARCHS may
# contain a list of arches for which rpmbuild commands (including the one for
# lustre itself)
unpack_linux_devel_rpm() {
    local kernelrpm="${1}"
    # it's worth noting that neither sles10 nor rhel5 appear to use their
    # extra_version delimiter for the dirname under /usr/src, so we could
    # probably just get rid of this parameter
    local delimiter=${2:-"-"}

    [ -f "$kernelrpm" ] || return 255
    [ -d $TOPDIR/reused ] || mkdir $TOPDIR/reused || return 255

    pushd $TOPDIR/reused &>/dev/null || return 255

    if ! rpm2cpio < "$kernelrpm" | cpio -id > /dev/null 2>&1; then
        return 255
    fi

    # call a distro specific hook, if available
    if type -p unpack_linux_devel_rpm-$DISTRO; then
        unpack_linux_devel_rpm-$DISTRO "$kernelrpm"
    fi

    popd &>/dev/null

    find_linux_devel_paths $TOPDIR/reused

    return 0

}

# XXX - this rhel/sles goop needs abstracting out into the
#       lbuild-{rhel5,sles10} method files
find_linux_devel_paths() {
    local path="$1"

    local RC=0

    pushd $path
        # RHEL-style and SLES-style rpms
        # XXX - until bug 19336 cleans this up, we need to extricate the
        #       ${lnxmin}- from the $lnxrel
        local paths="kernels/${lnxmaj}${lnxmin}${delimiter}${lnxrel}-${TARGET_ARCH} linux-${lnxmaj}${lnxmin}${delimiter}${lnxrel##${lnxmin#.}-}"

        local path
        for path in $paths; do
            local src='usr/src'

            if [ -d "$src/$path/" ]; then
                LINUX="$(pwd)/$src/$path"
            fi
            # SLES has a separate -obj tree
            if [ -d "$src/${path}-obj" ]; then
                local src="$src/${path}-obj"
                local objects="$TARGET_ARCH/$RPMSMPTYPE"

                # Novell, are you *TRYING* to make life hard for me?
                if [ -d "$src/powerpc" ]; then
                    objects="powerpc/$TARGET_ARCH"
                elif [ $TARGET_ARCH == 'i686' ]; then
                    objects="i386/$RPMSMPTYPE"
                fi

                LINUXOBJ="$(pwd)/$src/$objects"
            fi
        done
        if [ -z "$LINUX" ]; then
            RC=255
        else
            # dig out the release version
            LINUXRELEASE=$(find_linux_release ${LINUXOBJ:-$LINUX})
            if [ -z "$LINUXRELEASE" ]; then
                echo "Failed to find linux release in ${LINUXOBJ:-$LINUX}"
                RC=255
            fi
        fi
    popd
    return $RC
}

build_kernel_ib() {
    local linux="$1"

    # build kernel-ib{,-devel}
    local K_SRC="K_SRC"
    # ofed 1.3 had a bug in the rpm spec
    if [ "$OFED_VERSION" = "1.3" ]; then
        K_SRC="KSRC"
    fi

    local OFED_CORE="--with-core-mod --with-ipoib-mod --with-sdp-mod --with-user_mad-mod --with-user_access-mod --with-addr_trans-mod --with-rds-mod --with-qlgc_vnic-mod --with-madeye-mod"
    local OFED_HARDWARE="--with-mthca-mod --with-mlx4-mod --with-mlx4_en-mod --with-cxgb3-mod --with-nes-mod"
    # some I/B drivers are architecture dependent and kernel-ib's configure
    # does not figure it out for us ~sigh~
    case "$TARGET_ARCH" in
        ppc64)
            OFED_HARDWARE="$OFED_HARDWARE --with-ehca-mod"
            ;;
    esac
    # we're no longer shipping the OFED iSCSI
    #OFED_ISCSI="--with-srp-mod --with-srp-target-mod"
    ## ISER module has no backport support as of OFED 1.5 (i.e. only builds on
    ##kernels >= 2.6.30)
    #if [[ $OFED_VERSION = 1.[0-4]* ]]; then
    #   OFED_ISCSI="$OFED_ISCSI --with-iser-mod"
    #fi

    # assume we are just rebuilding the SRPM
    local BUILD_TYPE=${BUILD_TYPE:-"--rebuild"}
    local SOURCE="${TOPDIR}/OFED/SRPMS/ofa_kernel-*.src.rpm"

    # but switch to building from the SPEC if we need to apply patches
    if ls ${TOPDIR}/lustre/build/patches/ofed/* >/dev/null; then
        BUILD_TYPE="-bb"
        rpm --define "_topdir ${TOPDIR}" -ivh $SOURCE
        SOURCE="${TOPDIR}/SPECS/ofa_kernel.spec"
        local file ed_fragment1 ed_fragment2 n=1
        for file in ${TOPDIR}/lustre/build/patches/ofed/*; do
            ed_fragment1="$ed_fragment1
Patch$n: ${file%%*/}"
            ed_fragment2="$ed_fragment2
%patch$n -p0"
            cp $file ${TOPDIR}/SOURCES
            let n=$n+1
        done

        ed $SOURCE <<EOF
/^Source: /a
$ed_fragment1
.
/^%setup /a
$ed_fragment2
.
wq
EOF
    fi

    local linuxrelease=$(find_linux_release "$linux")
    if ! $RPMBUILD $BUILD_TYPE --define 'build_kernel_ib 1' --define 'build_kernel_ib_devel 1' \
                  --define "_topdir ${TOPDIR}" --target ${TARGET_ARCH} \
                  --define "KVERSION ${linuxrelease}" \
                  --define "$K_SRC ${linux}" \
                  --define "LIB_MOD_DIR /lib/modules/${linuxrelease}/updates" \
                  ${OFA_KERNEL_RELEASE:+--define "_release $OFA_KERNEL_RELEASE"} \
                  --define "configure_options --without-quilt $OFED_CORE $OFED_HARDWARE $OFED_ISCSI" \
                  ${SOURCE} 2>&1; then
        fatal 1 "Error building kernel-ib"
    fi

}

store_for_reuse() {
        local articles="$1"
        local module="$2"
        local location="$3"
        local signature="$4"
        local use_links="$5"

        local linkflag=""
        if $use_links; then
            linkflag="l"
        fi

        location="$location"/"$signature"/"$module"
        mkdir -p "$location"
        # the cleanup script removes any directory that doesn't have a
        # .lastused, so let's try to prevent that as soon as we can
        # this solution still slightly racy with the cleanup script
        # but the race is a lot tighter now
        touch -t 197001010000 "$location/.lastused"
        ## use eval/echo here to make sure shell expansions are performed
        #if ! cp -a${linkflag} $(eval echo $articles) "$location"; then
        local article
        for article in $(eval echo $articles); do
            if ! cp -a${linkflag} "$article" "$location"; then
                error "Failed to copy \"$article\" to \"$location\" in store_for_reuse()"
                # rename the cache location so that it's not cached
                # product, but is around for analysis
                mv "$location"{,-bad-$(date +%s)} ||
                    error "failed to clean up a failed cache attempt" \
                          "in \"$location\" -- manual cleanup will be" \
                          "necessary"
                return 1
            fi
        done

        # flag the cache as complete (i.e. in case lbuild was previously
        # interrupted while caching)
        touch "$location/.lastused"

        return 0

}

reuse() {
    local module="$1"
    local dest="$2"
    local use_links="${3:-false}"
    local signature="$4"

    if [ -n "$REUSEBUILD" ] && [ -d "$REUSEBUILD/$signature/$module" ]; then
        if [ ! -f "$REUSEBUILD/$signature/$module/.lastused" ]; then
            # the .lastused flag is populated at the end of the caching to
            # signal that the caching was completed.  if that flag is not
            # there, then the cache is invalid (and should be removed in fact)
            mv "$REUSEBUILD/$signature/$module"{,-bad-$(date +%s)} ||
                fatal 1 "failed to clean up a bad cache in location $REUSEBUILD/$signature/$module\" -- manual cleanup will be necessary"
            return 1
        fi

        # so that we know how stale this entry is
        touch $REUSEBUILD/$signature/$module/.lastused

        if $use_links; then
            if ls $REUSEBUILD/$signature/$module/* >/dev/null 2>&1; then
                cp -al $REUSEBUILD/$signature/$module/* $dest/
            fi
        else
            # copying is pretty heavy
            # cp -a $REUSEBUILD/$signature/$module/* $dest/
            # do some creative symlinking instead
            local dir
            for dir in BUILD SRPMS SPECS; do
                if ls $REUSEBUILD/$signature/$module/$dir/* >/dev/null 2>&1; then
                    ln -s $REUSEBUILD/$signature/$module/$dir/* $dest/$dir
                fi
            done
            # sources have to be copied by file because we need SOURCES to
            # be a dir we can write into
# could overrun ls's arg list here
            #ls $REUSEBUILD/$signature/$module/SOURCES/* |
            find $REUSEBUILD/$signature/$module/SOURCES/ -type f |
                xargs ln -t $dest/SOURCES -s

            # same for RPMS/* dirs
# could overrun ls's arg list here
            #ls $REUSEBUILD/$signature/$module/RPMS/$TARGET_ARCH/* |
            local dir
            for dir in $REUSEBUILD/$signature/$module/RPMS/*; do
                mkdir -p $dest/RPMS/${dir##*/}
                find $dir -type f |
                  xargs ln -t $dest/RPMS/${dir##*/} -s
            done

        fi
        return 0
    else
        return 1
    fi
}

basearch() {
    local arch="$1"

    if [[ $arch = i[3456]86 ]]; then
        echo "i386"
    else
        echo "$arch"
    fi

}

#
# in a given directory, find the first rpm matching given requirements
#
find_rpm() {
    local dir="$1"
    local match_type="$2"
    local match="$3"

    pushd "$dir" > /dev/null || \
        fatal 1 "Unable to chdir to directory \"$dir\" in find_rpm()"

    local file
    for file in $(ls *.rpm); do
        if [ ! -f "$file" ]; then
            continue
        fi
        case "$match_type" in
            provides)
                # match is any valid ERE (i.e. given to egrep) match
                if rpm -q --provides -p "$file" 2>&3 | egrep -q "$match"; then
                    echo "$file"
                    popd >/dev/null
                    return 0
                fi
                ;;
            *)
                popd >/dev/null
                fatal 1 "Unknown match type \"$match_type\" given to find_rpm()"
                ;;
        esac
    done

    popd >/dev/null
    return 1
}

build_kernel_with_srpm() {
    local outfd=$1

    if [ -z "$outfd" ] || [ $outfd = 1 ]; then
        fatal 1 "You must supply a file descriptor to ${FUNCNAME[0]} and it cannot be 1"
    fi

    # need to generate the patch for this target
    do_patch_linux false >&${outfd}    # sets global $FULL_PATCH (yeah, yuck)

    # get an md5sum of the kernel patch + config for reuse check
    # XXX really, there needs to be a signature and a CONFIG_FILE per arch
    #     in BUILD_ARCHS
    local release_str
    if $RELEASE; then
        local release_str="RELEASE=$RELEASE\n"
    fi
    local REUSE_SIGNATURE=$({ echo -en $release_str; echo $BUILD_GEN; cat $CONFIG_FILE $TARGET_FILE $FULL_PATCH; } | md5sum | cut -d" " -f1)

    # see if we can link to the reuse pool
    # XXX - hrm.  i'm not convinced this doesn't belong in the reuse "library"
    local CAN_LINK_FOR_REUSE=false
    touch $REUSEBUILD/$$
    if cp -al $REUSEBUILD/$$ $TOPDIR/ 2>/dev/null; then
        CAN_LINK_FOR_REUSE=true
    fi
    rm $REUSEBUILD/$$

    # the extra version string to use for the kernel (which might be a reused
    # kernel, remember)
    local kernel_extra_version=""
    if $REUSERPM && ! reuse kernel "$TOPDIR" "$CAN_LINK_FOR_REUSE" \
                                   "$REUSE_SIGNATURE"; then
        # nothing cached, build from scratch
        if [ ! -r "$KERNELDIR/$KERNEL_SRPM" ]; then
            echo "Downloading kernel SRPM"
            download_srpm "$CANONICAL_TARGET" "$KERNEL_SRPM" >&${outfd}
        fi

        if ! rpm -ivh $KERNELDIR/$KERNEL_SRPM \
                  --define "_topdir $TOPDIR" >&${outfd} 2>&1; then
            # should we clean this up or leave it for analysis?
            #rm -rf $RPMTOPDIR
            fatal 1 "Error installing kernel SRPM."
        fi

        # put the Lustre kernel patch into the RPM build tree
        cp $FULL_PATCH $TOPDIR/SOURCES/linux-${lnxmaj}-lustre.patch
        prepare_and_build_srpm >&${outfd} ||
            fatal 1 "failed to prepare_and_build_srpm"

        # store the resulting kernel RPM build tree for future use
        echo "caching the built kenel for future builds..." >&${outfd}
        if ! store_for_reuse "$TOPDIR/{SPECS,SOURCES,BUILD,SRPMS,RPMS}" \
                             "kernel" "$REUSEBUILD" "$REUSE_SIGNATURE" \
                             "$CAN_LINK_FOR_REUSE"; then
            error "Failed to store kernel RPMS for reuse"
            echo "unknown"
            return 1
        fi
    fi  # build reuse

    # figure out the EXTRA_VERSION of the kernel we built or are re-using
    local KERNEL_RPM
    if ! KERNEL_RPM=$(find_rpm "$TOPDIR/RPMS/$TARGET_ARCH/" provides "^kernel ="); then
        fatal 1 "Failed to find a kernel RPM in $TOPDIR/RPMS/$TARGET_ARCH/"
    fi
    kernel_extra_version=$(rpm -q --queryformat "%{RELEASE}" -p $TOPDIR/RPMS/$TARGET_ARCH/$KERNEL_RPM)

    # should now have the following RPMs
    # $TOPDIR/RPMS/$arch/kernel-lustre-2.6.18-53.1.21.el5_lustre.1.6.5.1.$arch.rpm
    # $TOPDIR/RPMS/$arch/kernel-lustre-devel-2.6.18-53.1.21.el5_lustre.1.6.5.1.$arch.rpm
    # $TOPDIR/RPMS/$arch/kernel-lustre-headers-2.6.18-53.1.21.el5_lustre.1.6.5.1.$arch.rpm
    # $TOPDIR/RPMS/$arch/kernel-lustre-debuginfo-common-2.6.18-53.1.21.el5_lustre.1.6.5.1.$arch.rpm
    # $TOPDIR/RPMS/$arch/kernel-lustre-debuginfo-2.6.18-53.1.21.el5_lustre.1.6.5.1.$arch.rpm

    echo $kernel_extra_version
    return 0

}

build_mptlinux() {
    local linux="$1"
    local version="$2"

    if [ -z "$version" -o "$version" = "inkernel" ]; then
        return 0
    fi

    local targets arch
    for arch in $BUILD_ARCHS; do
        targets="--target $arch $targets"
    done

    local rpmbuildopt='-bb'
    if $NORPM; then
        rpmbuildopt='-bc'
        echo NORPM mode. Only compiling.
    fi

    # if only we could just rebuild the src.rpm.  but the included spec
    # is a real pig's breakfast.  just check out the patch we need to
    # apply to it to make it useful.
    #$RPMBUILD --rebuild \
    #          --define "_topdir ${TOPDIR}" --target ${TARGET_ARCH} \
    #          ${TOPDIR}/mptlinux-*.src.rpm
    rpm -ivh --define "_topdir ${TOPDIR}" ${TOPDIR}/mptlinux-*.src.rpm

    # now the big honkin' patch to the spec file
    pushd ${TOPDIR}/SPECS
    # to regen this patch use:
    # !!cd ~/rpm/SPECS/ && diff -u mptlinux.spec{.dist,}
    patch -p0 < ${TOPDIR}/lustre/build/mptlinux.spec.patch || fatal 1 "failed to patch mptlinux.spec"
    popd

    local targets arch
        for arch in $BUILD_ARCHS; do
        targets="--target $arch $targets"
    done

    local rpmbuildopt='-bb'
    if $NORPM; then
        rpmbuildopt='-bc'
        echo NORPM mode. Only compiling.
    fi

    if ! $RPMBUILD $targets $rpmbuildopt \
                  --define "_tmppath /var/tmp" \
                  --define "_topdir ${TOPDIR}" \
                  --define "kernel_obj $linux" \
                  ${TOPDIR}/SPECS/mptlinux.spec 2>&1; then
        return 1
    fi
    if $DO_SRC; then
        if ! $RPMBUILD -bs \
                      --define "_tmppath /var/tmp" \
                      --define "_topdir ${TOPDIR}" \
                      --define "kernel_obj $linux" \
                      ${TOPDIR}/SPECS/mptlinux.spec 2>&1; then
            return 1
        fi
    fi

    return 0

}

# build RDAC
build_rdac() {
    local linux="$1"
    local version="$2"

    if [ -z "$version" -o "$version" = "inkernel" ]; then
        return 0
    fi

    # note that we use an _, not a . before the spec on purpose.  we are not
    # allowed to have more than one file with a .spec trailer in a tarball
    # that is supposed to be usable with rpmbuild
    cp lustre/build/rdac_spec ${TOPDIR}/SPECS/rdac.spec || fatal 1 "Could not find rdac.spec in lustre/build" 

    local targets arch
    for arch in $BUILD_ARCHS; do
        targets="--target $arch $targets"
    done

    local rpmbuildopt='-bb'
    if $NORPM; then
        rpmbuildopt='-bc'
        echo NORPM mode. Only compiling.
    fi

    local distro
    case $DISTRO in
     rhel5)     distro="REDHAT"
                ;;
    sles1*)     distro="SUSE"
                ;;
         *)     echo "$DISTRO not supported by RDAC, skipping"
                return 0
                ;;
    esac
    if ! $RPMBUILD $targets $rpmbuildopt --define "dist $distro" \
                  --define "_tmppath /var/tmp" \
                  --define "_topdir ${TOPDIR}" \
                  --define "kernel_obj $linux" \
                  ${TOPDIR}/SPECS/rdac.spec 2>&1; then
        return 1
    fi
    if $DO_SRC; then
        if ! $RPMBUILD -bs --define "dist $distro" \
                      --define "_tmppath /var/tmp" \
                      --define "_topdir ${TOPDIR}" \
                      --define "kernel_obj $linux" \
                      ${TOPDIR}/SPECS/rdac.spec 2>&1; then
            return 1
        fi
    fi

    return 0
}

# build OFED
# globals used:
#    TOPDIR
#    REUSEBUILD, REUSERPM
#    CONFIGURE_FLAGS

build_ofed() {
    local linux="$1"
    local ofed_version="$2"

    # before lustre, build kernel-ib
    if [ -z "$ofed_version" -o "$ofed_version" = "inkernel" ]; then
        return 0
    fi

    if [ -n "$REUSEBUILD" ]; then
        # see if we can link to the reuse pool
            # XXX - hrm.  i'm not convinced this doesn't belong in the reuse
            #       "library"
        local CAN_LINK_FOR_REUSE=false
        touch $REUSEBUILD/$$
        if cp -al $REUSEBUILD/$$ $TOPDIR/; then
            CAN_LINK_FOR_REUSE=true
        fi
        rm $REUSEBUILD/$$
    fi

    local REUSE_SIGNATURE=$({ echo "$ofed_version";
                              echo "$(find_linux_release ${linux})";
                              cat "${linux}/include/linux/autoconf.h"; } |
                            md5sum | cut -d" " -f1)
    if ! $REUSERPM || ! reuse ofed "$TOPDIR" "$CAN_LINK_FOR_REUSE" \
                                   "$REUSE_SIGNATURE"; then
        # stash away the existing built articles for a moment
        mkdir bak
        mv {BUILD,{S,}RPMS,S{OURCE,PEC}S} bak
        function mv_back {
            pushd bak
            find . | cpio -pudlm ..
            popd
            rm -rf bak
        }
        create_rpmbuild_dirs
        # build it
        build_kernel_ib "${linux}"
        if ! store_for_reuse "$TOPDIR/{SPECS,SOURCES,BUILD,SRPMS,RPMS}" \
                             "ofed" "$REUSEBUILD" "$REUSE_SIGNATURE" \
                             "$CAN_LINK_FOR_REUSE"; then
            error "Failed to store OFED RPMS for reuse"
            mv_back
            return 1
        fi
        # put the stuff we stashed away back
        mv_back
    fi

    pushd "$TOPDIR" >/dev/null
    rm -rf kernel-ib-devel
    mkdir kernel-ib-devel
    cd kernel-ib-devel
    # the actual ofed RPMs don't have the -rc$n or -$date string appened that
    # might be present on the file
    local linuxrelease=$(find_linux_release "$linux")
    ofed_version=$(echo $ofed_version |
                   sed -re 's/-(20[0-9]{6,6}-[0-9]{4,4}|rc[0-9]*)$//')
    local rpm=$(ls $TOPDIR/RPMS/*/kernel-ib-devel-${ofed_version}-${linuxrelease//-/_}.*.rpm)
    rpm2cpio -itv < $rpm | cpio -id
    CONFIGURE_FLAGS="--with-o2ib=$(pwd)/usr/src/ofa_kernel ${CONFIGURE_FLAGS}"
    popd >/dev/null

}

build_with_srpm() {

    if ! $PATCHLESS; then
        local kernel_extra_version
        if ! kernel_extra_version=$(build_kernel_with_srpm ${STDOUT}); then
            fatal 1 "Failed to build the kernel from it's SRPM"
        fi

        for arch in $BUILD_ARCHS; do
            local kernel_devel_rpm
            if ! kernel_devel_rpm=$(find_rpm "$TOPDIR/RPMS/$arch/" provides "^$(devel_kernel_name $KERNEL_LUSTRE_NAMING) ="); then
                fatal 1 "Failed to find a kernel development RPM in $TOPDIR/RPMS/$arch/"
            fi

            # install the -devel RPM in preparation for the lustre build
            # note that the EXTRA_VERSION_DELIMITER is *NOT* used in the
            # version of the directory name under /usr/src
            if ! lnxrel="$kernel_extra_version" unpack_linux_devel_rpm \
                           "$TOPDIR/RPMS/$arch/$kernel_devel_rpm" "-"; then
                fatal 1 "Could not find the Linux tree in $TOPDIR/RPMS/$arch/$kernel_devel_rpm"
            fi
        done
    else
        # need to find and unpack the vendor's own kernel-devel for patchless
        # client build
        local kernelrpm
        if ! kernelrpm=$(find_linux_rpm "-$DEVEL_KERNEL_TYPE" ${EXTRA_VERSION_DELIMITER:-"-"}); then
            fatal 1 "Could not find the kernel-$DEVEL_KERNEL_TYPE RPM in ${KERNELRPMSBASE}/${lnxmaj}/${DISTRO}"
        fi
        if ! lnxrel="$lnxrel" unpack_linux_devel_rpm "$kernelrpm" "-"; then
            fatal 1 "Could not find the Linux tree in $kernelrpm"
        fi
    fi

    build_ofed "${LINUXOBJ:-$LINUX}" "$OFED_VERSION" ||
        fatal 1 "error building OFED"

    if ! $PATCHLESS; then
        # only need RDAC for the server
        build_rdac "${LINUXOBJ:-$LINUX}" "$RDAC_VERSION" ||
            fatal 1 "error building RDAC"
    fi

    build_mptlinux "${LINUXOBJ:-$LINUX}" "$MPTLINUX_VERSION" ||
        fatal 1 "error building mptlinux"

    # now build Lustre
    if build_lustre "$LINUX" "$LINUXOBJ"; then
        # the build worked.  resolve any symlinked files (i.e. from reuse)
        # in RPMS/$arch to real files so that that that huge mess of
        # complication known as LTS can copy them yet somewhere else.
        # is it any wonder this whole process is so damn so?  anyone ever
        # heard of hardlinks?  it this cool new thing that allows you save
        # tons of time and space by creating... well you can go read about
        # them if you have not heard about them yet.
        # can i say how much the implemenation of all of this really impedes
        # RPM reuse?
        pushd RPMS/$TARGET_ARCH
            for file in *; do
                if [ -h $file ]; then
                    cp $file foo
                    mv foo $file
                fi
            done
        popd
    else
        return 1
    fi

}

create_rpmbuild_dirs() {

    [ -d RPMS ] || mkdir RPMS
    for arch in $BUILD_ARCHS; do
        if [[ $arch = i?86 ]]; then
            # some stupidity in the sles11 kernel spec requires an RPMS/i386
            # even if the target arch is i686
            [ -d RPMS/i386 ] || mkdir RPMS/i386
        fi
        [ -d RPMS/$arch ] || mkdir RPMS/$arch
    done
    [ -d BUILD ] || mkdir BUILD
    [ -d SOURCES ] || mkdir SOURCES
    [ -d SPECS ] || mkdir SPECS
    [ -d SRPMS ] || mkdir SRPMS

}

new_list() {

    echo ""

}

add_list() {
    local list="$1"
    local item="$2"

    echo "$list $item"

}

is_list_member() {
    local list="$1"
    local item="$2"

    [[ $list\  == *\ $item\ * ]]

}

#########################################################################
# Generate a backtrace through the call stack.
#
# Input: None
# Output: None
#########################################################################
backtrace() {
    local strip=${1:-1}

    local funcname="" sourcefile="" lineno="" n

    echo "Call stack: (most recent first)"
    for (( n = $strip ; n < ${#FUNCNAME[@]} ; ++n )) ; do
        funcname=${FUNCNAME[$n - 1]}
        sourcefile=$(basename ${BASH_SOURCE[$n]})
        lineno=${BASH_LINENO[$n - 1]}
        if [ $n = 1 ]; then
            let lineno-=11
        fi
        # Display function arguments
        if [[ ! -z "${BASH_ARGV[@]}" ]]; then
            local args newarg j p=0
            for (( j = ${BASH_ARGC[$n - 1]}; j > 0; j-- )); do
                newarg=${BASH_ARGV[$j + $p - 1]}
                args="${args:+${args} }'${newarg}'"
            done
            let p+=${BASH_ARGC[$n - 1]}
        fi
        echo "  ${funcname} ${args:+${args} }at ${sourcefile}:${lineno}"
    done

    echo
    echo "BEGIN BACKTRACE"

    #echo ${BASH_LINENO[*]}
    #echo ${BASH_SOURCE[*]}
    #echo ${FUNCNAME[*]}
    local i=$((${#FUNCNAME[@]} - 1))
    while [ $i -ge 0 ]; do
        local lineno=${BASH_LINENO[$i]}
        if [ $i = 0 ]; then
            let lineno-=11
        fi
        local SOURCELINE="${BASH_SOURCE[$i + 1]}:${lineno}"
        # Can't figure out how to get function args from other frames...
        local FUNCTION="${FUNCNAME[$i]}()"
        echo "$SOURCELINE:$FUNCTION"
        i=$((i - 1))
    done

    echo "END BACKTRACE"

    echo $BACKTRACE

}

seen_list=$(new_list)
trap 'set +x;
echo "An unexpected error has occurred at ${BASH_SOURCE[0]##*/}:$((LINENO-1)).
Unfortunately the above line number in the message may or may not be correct,
but details have been send to the lbuild maintainer.  Attempting to continue."; (echo "Untrapped error"
echo
# have we seen this one
echo "checking seen list for ${BASH_SOURCE[0]}:${BASH_LINENO[0]}"

if is_list_member "$seen_list" "${BASH_SOURCE[0]}:${BASH_LINENO[0]}"; then
  echo "seen this one already"
else
  seen_list=$(add_list "$seen_list" "${BASH_SOURCE[0]}:${BASH_LINENO[0]}")
fi
backtrace
echo
echo "Environment:"
set
) | mail -s "Untrapped error at ${BASH_SOURCE[0]##*/}:$((LINENO-15)) on $HOSTNAME" brian@sun.com >&2; set $xtrace' ERR
set -E

[ -r ~/.lbuildrc ] && . ~/.lbuildrc

options=$(getopt -o d:D:h -l kerneltree:,distro:,kernelrpm:,reusebuild:,patchless,ldiskfs,ccache,reuse:,norpm,disable-datestamp,external-patches:,timestamp:,extraversion:,kerneldir:,linux:,lustre:,nodownload,nosrc,ofed-version:,publish,release,set-value:,src,stage:,tag:,target:,target-archs:,with-linux:,xen -- "$@")

if [ $? != 0 ]; then
    usage 1
fi

eval set -- "$options"

while [ "$1" ]; do
    case "$1" in
        '')
            usage 1
            ;;
        --ccache)
            CCACHE='ccache'
            shift
            ;;
        -d)
            CVSROOT=$2
            shift 2
            ;;
        -D)
            DATE=$2
            shift 2
            ;;
        --external-patches)
            EXTERNAL_PATCHES=$2
            shift 2
            ;;
        --extraversion)
            EXTRA_VERSION=$2
            shift 2
            ;;
        --help | -h)
            usage 0
            ;;
        --kerneldir)
            KERNELDIR=$2
            shift 2
            ;;
        --kerneltree)
            if ! KERNELTREE=$(canon_path "$2"); then
                fatal 1 "Could not determine the canonical location of $2"
            fi
            shift 2
            ;;
        --linux | --with-linux)
            if ! LINUX=$(canon_path "$2"); then
                fatal 1 "Could not determine the canonical location of $2"
            fi
            shift 2
            ;;
        --distro)
            DISTRO=$2
            shift 2
            ;;
        --reuserpm)
            REUSERPM=$2
            shift 2
            ;;
        --reusebuild)
            if ! REUSEBUILD=$(canon_path "$2"); then
                fatal 1 "Could not determine the canonical location of $2"
            fi
            shift 2
            ;;
        --norpm)
            NORPM=true
            shift
            ;;
        --ldiskfs)
            LDISKFSRPM=true
            shift
            ;;
        --patchless)
            PATCHLESS=true
            shift
            ;;
        --kernelrpm)
            if ! KERNELRPMSBASE=$(canon_path "$2"); then
                fatal 1 "Could not determine the canonical location of $2"
            fi
            shift 2
            ;;
        --timestamp)
            TIMESTAMP=$2
            shift 2
            ;;
        --lustre)
            LUSTRE=$2
            shift 2
            ;;
        --nodownload)
            DOWNLOAD=false
            shift 1
            ;;
        --nosrc)
            DO_SRC=false
            shift 1
            ;;
        --ofed-version)
            OFED_VERSION="$2"
            shift 2
            ;;
        --publish)
            shift
            ;;
        --release)
            RELEASE=true
            shift
            ;;
        --src)
            DO_SRC=true
            shift 1
            ;;
        --stage)
            STAGEDIR=$2
            shift 2
            ;;
        --tag)
            TAG=$2
            shift 2
            ;;
        --target)
            TARGET=$2
            shift 2
            ;;
        --target-archs)
            TARGET_ARCHS=$2
            shift 2
            ;;
        --disable-datestamp)
            USE_DATESTAMP=
            shift
            ;;
        --xen)
            XEN=true
            shift
            ;;
        --set-value)
            eval $2
            shift 2
            ;;
        --)
            shift
            CONFIGURE_FLAGS=$@
            CONFIGURE_FLAGS="$CONFIGURE_FLAGS --enable-liblustre --enable-liblustre-tests"
            break
            ;;
        *)
            usage 1 "Unrecognized option: $1"
            ;;
    esac
done

check_options

unpack_lustre

load_target
EXTRA_VERSION_DELIMITER=${EXTRA_VERSION_DELIMITER:-"-"}

if [ -n "$OFED_VERSION" -a "$OFED_VERSION" != "inkernel" ]; then
    download_ofed
    unpack_ofed || fatal 1 "Error unpacking OFED tarball"
fi

if [ -n "$MPTLINUX_VERSION" -a "$MPTLINUX_VERSION" != "inkernel" ]; then
    download_mptlinux
    unpack_mptlinux || fatal 1 "Error unpacking MPTLINUX distribution"
fi

# make sure the RPM build environment is set up
create_rpmbuild_dirs

if [ -n "$RDAC_VERSION" -a "$RDAC_VERSION" != "inkernel" ]; then
    download_rdac
    # we don't actually need to unpack this.  just put it in the SOURCES dir
    #unpack_rdac || fatal 1 "Error unpacking RDAC tarball"
    cp "$KERNELTREE/rdac-LINUX-${RDAC_VERSION}-source.tar.gz" ${TOPDIR}/SOURCES/ ||
        fatal 1 "Error copying RDAC source tarball to RPM SOURCES dir"
fi

# if an unpacked kernel source tree was given on the command line
# just build lustre with it (nothing distro kernel specific here)
if [ -n "$LINUX" ]; then
    build_mptlinux "${LINUXOBJ:-$LINUX}" "$MPTLINUX_VERSION" ||
        fatal 1 "error building mptlinux"
    build_ofed "${LINUXOBJ:-$LINUX}" "$OFED_VERSION" ||
        fatal 1 "error building OFED"
    if ! $PATCHLESS; then
        build_rdac "${LINUXOBJ:-$LINUX}" "$RDAC_VERSION" ||
            fatal 1 "error building RDAC"
    fi
    build_lustre "$LINUX" "$LINUXOBJ"
else
    if [ -f "${0%/*}/lbuild-$DISTRO" ]; then
        source ${0%/*}/lbuild-$DISTRO

        build_with_srpm || fatal 1 "Failed to build_with_srpm"
    else
        source ${0%/*}/lbuild.old_school

        old_school_download_kernel

        build_success=false
        if $PATCHLESS; then
            patchless_build_sequence && build_success=true
        else
            [ "$DISTRO" = "sles9" ] && build_sequence_rpm_reuse && build_success=true
            if ! $build_success; then
                build_sequence_reuse && build_success=true
                if ! $build_success; then
                    build_sequence && build_success=true
                    if $build_success; then
                        store_for_reuse || echo "Cannot store for future reuse"
                    fi
                fi
            fi
        fi
        ( $build_success ) || fatal 1 "Cannot build lustre"
    fi
fi

stage