#!/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

# Assume that lbuild's support files can be found in the same
# canonicalized path as this very script.
LBUILD_SCRIPT=$(readlink -f ${0})
LBUILD_DIR=${LBUILD_DIR:-$(dirname ${LBUILD_SCRIPT})}

# include the exit_traps library
. ${LBUILD_DIR}/exit_traps.sh
. ${LBUILD_DIR}/funcs.sh

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

# increment this if you have made a change that should force a new kernel
# to build built
BUILD_GEN=8

TOPDIR="$PWD"

KERNELDIR=
LINUX=
LUSTRE=
RELEASE=false
# XXX - some recent hacking has pretty much neutered this option.
#       search through this file for "-bb" and see how many places
#       simply don't account for this option
DO_SRC=true
DOWNLOAD=true
CANONICAL_TARGET=
TARGET=
TARGET_ARCH="$(uname -m)"
CONFIGURE_FLAGS=
EXTERNAL_PATCHES=
EXTRA_VERSION=
STAGEDIR=
TMPDIR=${TMPDIR:-"/var/tmp"}
TIMESTAMP=
# default OFED
OFED_TYPE="inkernel"
# this is the dir that should be used to store reuse products
REUSEBUILD=
# should cached products be used or force rebuilding?
USE_BUILD_CACHE=true
# what does this do exactly?  does it imply no kernel build?
IOKITRPM=true
OSDLDISKFSRPM=true
OSDZFSRPM=false
SMPTYPES="smp bigsmp default ''"
PATCHLESS=false
PATCHLESS_SERVER=false
WITH_ZFS=""
XEN=false
LINUXOBJ=
DISTRO=
KERNELTREE=
# default to not adding -lustre- into the kernel RPM package names
KERNEL_LUSTRE_NAMING=false
# default not use kabi check.
USE_KABI=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=

# build the lustre-tests rpm?
LUSTRE_TESTS=true

DATE=$(date)

RPMBUILD=

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
}

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

  --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

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

  --kernelrpm=DIR
    Path to distro kernel RPM collection

  --ccache
    Use ccache

  --norpm
    Unused.

  --patchless
    Build lustre client only

  --patchless-server
    Build lustre server without patching the kernel

  --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.

  --nodownload
    Do not try to download a kernel from downloads.whamcloud.com

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

  --ofed-type
    Type of OFED to build with lustre: inkernel, ofa, mlnx, ifs
    ofa: OpenFabrics Alliance
    mlnx: Mellanox
    ifs: Intel True Scale Fabric

  --ofed-version
    Version of external OFED to build with lustre

  --mlnx-version
    Version of external Mellanox OFED to build with lustre

  --ofed-src
    Tarball for either OFED. Tarball must follow below format
    OFED-<ofed-version>.tgz regardless of vendors
    It's likely that you need to reconstruct the directory name
    It must be placed under KERNELTREE directory

  --ldiskfs
    Build with ldiskfs support. (Deprecated, always true)

  --noiokit
    Do not build lustre-iokit RPM. Now true by default

  --publish
    Unused.

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

  --disable-zfs
    Build Lustre without ZFS.

  --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.

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

  --xen
    Builds a Xen domX kernel.

  --set-value
    Sets a variable to a given value.

EOF

#   list_targets

    fatal "$1" "$2"
}

# canonicalize a relative path to a file
canon_filepath() {
    local PATH="$1"

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

    local FILE=${PATH##*/}
    local DIR=${PATH%/*}

    echo $(canon_path "$DIR")/$FILE
    return 0
}

# canonicalize a relative path to a dir
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 [ -z "$LUSTRE" -o ! -r "$LUSTRE" ]; then
        usage 1 "Could not find Lustre source tarball '$LUSTRE'."
    fi

	if $PATCHLESS && $PATCHLESS_SERVER; then
		usage 1 "Can not use both --patchless and --patchless-server."
	fi

	if [ -n "${OFED_SRC}" ]; then
		if [ -z "${OFED_VERSION}" ]; then
			usage 1 "Need to provide version for file ${OFED_SRC}."
		fi
		if [ "${OFED_TYPE}" = "inkernel" ]; then
			usage 1 "Need to provide ofed type for file ${OFED_SRC}."
		fi
	else
		if [ "${OFED_TYPE}" != "inkernel" -a -z "${OFED_VERSION}" ]; then
			usage 1 "Need to provide version for $OFED_TYPE OFED"
		fi

		if [ "${OFED_TYPE}" = "inkernel" -a -n "${OFED_VERSION}" ]; then
			usage 1 "Can not specify version with inkernel OFED"
		fi
	fi

    if [ -z "$DISTRO" ] ; then
        DISTRO=$(autodetect_distro)
        # remove separator
        DISTRO=${DISTRO/-/}
    fi
    DISTROMAJ=${DISTRO%%.*}

    [ -z "$TARGET" ] && TARGET=$(autodetect_target "$DISTRO")

    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."

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

    case $TARGET in
        3.12-sles12 | 4.4-sles12)
            CANONICAL_TARGET="sles12"
            ;;
        3.10-rhel7*)
            CANONICAL_TARGET="rhel7"
            ;;
        2.6-rhel6*)
            CANONICAL_TARGET="rhel6"
            ;;
        2.6-rhel5)
            CANONICAL_TARGET="rhel5"
            ;;
        2.6-rhel4)
            CANONICAL_TARGET="rhel-2.6"
            ;;
        2.6-suse)
            CANONICAL_TARGET="sles-2.6"
            ;;
        2.6-sles10)
            CANONICAL_TARGET="sles10-2.6"
            ;;
        2.6-sles11 | 3.0-sles11)
            CANONICAL_TARGET="sles11"
            ;;
        2.6-oel5)
            CANONICAL_TARGET="oel5"
            ;;
        hp_pnnl-2.4)
            CANONICAL_TARGET="hp-pnnl-2.4"
            ;;
        2.6-vanilla \
            | suse-2.4.21-2 \
            | rh-2.4 \
            | rhel-2.4 \
            | sles-2.4 \
            | 2.6-patchless)
                CANONICAL_TARGET="$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=$(which rpmbuild 2>/dev/null | head -n 1)
    RPMBUILD=${RPMBUILD:-$(which rpm 2>/dev/null | head -n 1)}
    if [ -z "$RPMBUILD" ]; then
        usage 1 "Could not find binary for making rpms (tried rpmbuild and rpm)."
    fi

    local BINDIR="$TOPDIR/bin"
    if [ -d $BINDIR ]; then
        rm -rf $BINDIR >/dev/null 2>&1 || true
    fi

    mkdir -p $BINDIR || fatal 1 "error trying to create $BINDIR"
    export PATH=$BINDIR:$PATH

    cat >${BINDIR}/rpmbuild <<EOF
#!/bin/bash

ARGS="\${FIND_REQUIRES:+--define \"__find_requires \$FIND_REQUIRES\"}"
for arg; do
    case \$arg in
    *\'* ) ARGS="\$ARGS \"\$arg\"" ;;
    * ) ARGS="\$ARGS '\$arg'" ;;
    esac
done

eval $RPMBUILD \$ARGS
EOF
    chmod 755 ${BINDIR}/rpmbuild

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

        if which "$CCACHE" &>/dev/null; then
            local ccache=$(which "$CCACHE" 2>/dev/null | head -n 1)

            ln -s "$ccache" ${BINDIR}/ccache
            ln -s "$ccache" ${BINDIR}/cc
            ln -s "$ccache" ${BINDIR}/$CC

            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

    return 0
}

# compare two versions $1 and $2. if $1 < $2, return 0 otherwise return 1.
compare_version () {
    [[ $1 == $2 ]] && return 1
    local IFS=.
    local i val1=($1) val2=($2)

    # padding zero to val1 if it needs
    for ((i=${#val1[@]}; i<${#val2[@]}; i++)); do
        val1[i]=0
    done
    for ((i=0; i<${#val1[@]}; i++)); do
        [[ -z ${val2[i]} ]] && return 1

        if [[ ${val1[i]} < ${val2[i]} ]]; then
            return 0
        elif [[ ${val1[i]} > ${val2[i]} ]]; then
            return 1
        fi
    done
    return 1
}

uniqify() {

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

}

fetch_url() {
    local url="$1"
    local target="$2"

    if [ -z "$target" ]; then
        fatal 1 "fetch_url() called without a target to fetch to"
    fi

    if [ -d $target ]; then
        target+="/${url##*/}"
    fi

    local rc=0
    if which wget >/dev/null 2>&1; then
        if ! wget -nv "$url" -O "$target"; then
            rc=${PIPESTATUS[0]}
        fi
    elif which curl >/dev/null 2>&1; then
        if ! curl -n -L -s -o "$target" "$url"; then
            rc=${PIPESTATUS[0]}
        fi
    else
        fatal 1 "Could not find either wget or curl to fetch URLs."
    fi

    return $rc

}

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

	# let the download_file handle the concurrency
	if $DOWNLOAD; then
		local location
		# get the location from a distro specific method if it exists
		if type -p kernel_srpm_location; then
			location=$(kernel_srpm_location)
		else
			fatal 1 "Must specify location for download kernel SRPM."
		fi
		echo "Downloading $location/$srpm..."
		if ! download_file \
			"$location/$srpm" "$KERNELDIR/$srpm" "$force" 2>&1 ||
			[ ! -s "$KERNELDIR/$srpm" ]; then
			rm -f $KERNELDIR/$srpm
			fatal 1 "Could not download target $target's kernel \
SRPM $srpm from $location."
		fi
	fi
}

download_debuginfo_common() {
	local rpm=$1
	local force="${2:-false}"

	# let the download_file handle the concurrency
	if $DOWNLOAD; then
		# get the location from a distro specific method if it exists
		if type -p kernel_debuginfo_location; then
		location=$(kernel_debuginfo_location)
		fi
		echo "Downloading $location/$rpm"
		if ! download_file \
			"$location/$rpm" "$KERNELRPMSBASE/$lnxmaj/$DISTROMAJ/$TARGET_ARCH/$rpm" "$force" 2>&1 ||
			[ ! -s "$KERNELRPMSBASE/$lnxmaj/$DISTROMAJ/$TARGET_ARCH/$rpm" ]; then
			rm -f $KERNELRPMSBASE/$lnxmaj/$DISTROMAJ/$TARGET_ARCH/$rpm
			fatal 1 "Could not download $rpm from $location."
		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 $semaphore
            if ! fetch_url "$from" "$to" || [ ! -s "$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 ofed_type="$1"
	local ofed_version="$2"
	local force="${3:-false}"
	local distro_name="${DISTRO}"
	local arch="${TARGET_ARCH}"
	local location
	local file

	#if a src tarball has been given in the command line, we use it
	#The format of the tarball must be OFED-${OFED_VERSION}.tgz
	[ -n "${OFED_SRC}" ] && return 0

	case $ofed_type in
		ofa)
			location="https://www.openfabrics.org/downloads/OFED/ofed-${ofed_version}/"
			# version include RC
			if [[ $ofed_version = *-[rR][cC][0-9] ]]; then
				ofed_version_loc=${ofed_version%%-[rR][cC][0-9]}
				location="https://www.openfabrics.org/downloads/OFED/ofed-${ofed_version_loc}/"
			fi
			# daily build
			if [[ $ofed_version = *-daily ]]; then
				ofed_version=${ofed_version/-daily/}
				location="https://www.openfabrics.org/downloads/OFED/ofed-${ofed_version}-daily/"
				# find the filename for latest version
				ofed_version=$(curl -1 -s "$location" | sed -nre "s/.*href=\"OFED-(${ofed_version//./\\.}-[0-9]{8}-[0-9]{4}).tgz.*$/\1/p" | tail -1)
				if [ -z "$ofed_version" ]; then
					fatal 1 "Could not determine the filename of the OFED snapshot from daily "
				fi
			fi

			file="OFED-${ofed_version}.tgz"
			download_file "$location/$file" "$KERNELTREE" "$force"
			;;
		mlnx)
			location="http://www.mellanox.com/downloads/ofed/MLNX_OFED-${ofed_version}"
			# this is a work around for suse distro (sles11.3). what we need is
			# sles11sp3. We really need to redesign how we use target and distro
			[[ $distro_name =~ sles ]] && distro_name=${DISTRO/./sp}
			file="MLNX_OFED_LINUX-${ofed_version}-${distro_name}-${arch}.tgz"
			download_file "$location/$file" "$KERNELTREE" "$force"
			;;
		ifs)
			location="http://downloadmirror.intel.com/24625/eng/"
			file="IntelIB-Basic.$(echo ${distro_name%%.*} | tr '[:lower:]' '[:upper:]')-${arch}.${ofed_version}.tgz"
			download_file "$location/$file" "$KERNELTREE" "$force"
			;;
		*)
			fatal 1 "Error: unknown OFED type: $ofed_type"

	esac
	# version might change due to detect daily version
	OFED_VERSION=${ofed_version}

}

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 overwritten 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.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 $PATCHLESS || [ -n "$SERIES" ]; then
            EXTRA_VERSION=$(echo $EXTRA_VERSION | sed -e "s/\(.*_lustre\)\..*/\1/")
        fi
    fi
    # EXTRA_VERSION=${EXTRA_VERSION//-/_}
}

tarflags() {
    local file="$1"

    echo -n '--wildcards '
    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 tarfile="$1"
    shift
    local extractfile="$@"

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

}

unpack_ofed() {
	local ofed_type="$1"
	local ofed_version="$2"
	local distro_name="${DISTRO}"
	local arch="${TARGET_ARCH}"
	local file

	#if a src tarball has been given in the command line, we use it
	#The format of the directory after untar MUST be in OFED-${version}
	#even if it's from MLNX or IFS...or whatever
	if [ -n "${OFED_SRC}" ]; then
		if ! untar "$KERNELTREE/${OFED_SRC}"; then
			return 1
		else
			[ -d OFED ] || ln -sf OFED-[0-9].[0-9]* OFED
		fi
	fi
	case $ofed_type in
		ofa)
			file="OFED-${ofed_version}"
			if ! untar "$KERNELTREE/${file}.tgz"; then
				return 1
			fi
			[ -d OFED ] || ln -sf OFED-[0-9].[0-9]* OFED
			;;
		mlnx)
			# this is a work around for suse distro (sles11.3). what we need is
			# sles11sp3. We really need to redesign how we use target and distro
			[[ $distro_name =~ sles ]] && distro_name=${DISTRO/./sp}
			file="MLNX_OFED_LINUX-${ofed_version}-${distro_name}-${arch}"

			# it's not important what distro we get the tarball since we only
			# interest in the src
			if ! untar "$KERNELTREE/${file}.tgz"; then
				return 1
			fi
			# we need to untar again to get the src since it's being
			# wrapped inside the tarball
			# There are cases where the source version is different
			# than the tarball.
			# (ie. MLNX_OFED_LINUX-2.3-1.0.1 but MLNX_OFED_SRC-2.3-1.0.0)
			local src=$(ls ${file}/src/MLNX_OFED_SRC-${ofed_version%.*}*.tgz)
			if ! untar "$src"; then
				return 1
			fi
			[ -d OFED ] || ln -sf MLNX_OFED_SRC-[0-9].[0-9]* OFED
			[ -d OFED_RPMS ] || ln -sf ${file}/RPMS OFED_RPMS
			;;
		ifs)
			file="IntelIB-Basic.$(echo ${distro_name%%.*} | tr '[:lower:]' '[:upper:]')-${arch}.${ofed_version}"
			if ! untar "$KERNELTREE/${file}.tgz"; then
				return 1
			fi
			[ -d OFED ] || ln -sf $file/IntelIB-OFED.$(echo ${distro_name%%.*} | tr '[:lower:]' '[:upper:]')-${arch}.* OFED
			ofed_version="$(cat OFED/Version)"
			;;
	esac
	# version might change due to detect daily version
	OFED_VERSION=${ofed_version}
}

unpack_lustre() {

    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}-${EXTRA_VERSION}.patch"
    [ -f "$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"
    local configure_args=""

    cp "$LUSTRE" SOURCES

    pushd lustre >/dev/null

    if ! build_lustre_dkms; then
        popd >/dev/null # pushd lustre
        return 255
    fi

    echo "Building Lustre RPMs for: $TARGET_ARCH"

    # If server we now build the spl and zfs modules against the lustre kernel.
    # These are required prior to the building of lustre server. Client does
    # not require spl/zfs. Use !PATCHLESS to indicate server which follows the
    # line above so is at least consistant.
    if [ $PATCHLESS == false ] && [ "x$WITH_ZFS" == "x" ]; then
        if ! build_spl_zfs; then
            popd >/dev/null # pushd lustre
            return 255
        fi
    fi

    if $PATCHLESS; then
        configure_args="$configure_args --disable-server"
    fi

    # ditto for the lustre-tests boolean
    if ! $LUSTRE_TESTS; then
        configure_args="$configure_args --disable-tests"
    fi

    if ! $IOKITRPM; then
        configure_args="$configure_args --disable-iokit"
    fi

    if ! $OSDZFSRPM; then
        configure_args="$configure_args --without-zfs"
    fi

    if ! $OSDLDISKFSRPM; then
        configure_args="$configure_args --disable-ldiskfs"
    fi

    configure_args="$configure_args --with-linux=$linux"
    configure_args="$configure_args ${linuxobj:+--with-linux-obj=$linuxobj}"

    # allow environment setting to override ldiskfs series selection
    [ -n "$LDISKFS_SERIES" ] && export LDISKFS_SERIES

    ./configure $configure_args $CONFIGURE_FLAGS 2>&1 ||
        fatal 1 "Error in configure."

    if type -p apply_kmod_requires_conflicts; then
        apply_kmod_requires_conflicts
    fi

    make rpms 2>&1 ||
        fatal 1 "Error building rpms for $TARGET_ARCH."

    # move RPMs into place where they are expected to be
    mv -f *lustre*.${TARGET_ARCH}.rpm $TOPDIR/RPMS/${TARGET_ARCH}/
    mv -f lustre-*.src.rpm $TOPDIR/SRPMS/

    popd >/dev/null
	if type -p cleanup_rpmmacros; then
		cleanup_rpmmacros
	fi

    return 0
}

build_lustre_dkms() {
    local build_args=""
    local ver=$(sed -n -e 's/^LUSTRE_VERSION = //p' LUSTRE-VERSION-FILE)

    echo "Building Lustre DKMS RPMs for: $TARGET_ARCH"
    ./configure --enable-dist || fatal 1 "Error in DKMS configure."

    if $PATCHLESS; then
        build_args="--without servers"
    fi

    rpmbuild --define "_topdir $TOPDIR" $build_args -bs lustre-dkms.spec ||
        fatal 1 "Error building DKMS .src.rpm for $TARGET_ARCH."

    if $PATCHLESS; then
	rpmbuild --define "_topdir $TOPDIR" $build_args \
             --rebuild $TOPDIR/SRPMS/lustre-client-dkms-$ver-*.src.rpm ||
        fatal 1 "Error building DKMS .rpm for $TARGET_ARCH."
    else
	rpmbuild --define="_topdir $TOPDIR" --with servers \
	    --with zfs --without ldiskfs -bs lustre-dkms.spec ||
	fatal 1 "Error creating DKMS (zfs) .srpm for $TARGET_ARCH."
	rpmbuild --define="_topdir $TOPDIR" --with servers \
	    --without zfs --with ldiskfs -bs lustre-dkms.spec ||
	fatal 1 "Error creating DKMS (ldiskfs) .srpm for $TARGET_ARCH."
	rpmbuild --define="_topdir $TOPDIR" --with servers \
	    --with zfs --with ldiskfs -bs lustre-dkms.spec ||
	fatal 1 "Error creating DKMS (all) .srpm for $TARGET_ARCH."

	rpmbuild --rebuild --define="_topdir $TOPDIR" --with servers \
	    --with zfs --without ldiskfs $TOPDIR/SRPMS/lustre-zfs-dkms-$ver-*.src.rpm ||
	fatal 1 "Error building DKMS (zfs) .rpm for $TARGET_ARCH."
	rpmbuild --rebuild --define="_topdir $TOPDIR" --with servers \
	    --without zfs --with ldiskfs $TOPDIR/SRPMS/lustre-ldiskfs-dkms-$ver-*.src.rpm ||
	fatal 1 "Error building DKMS (ldiskfs) .rpm for $TARGET_ARCH."
	rpmbuild --rebuild --define="_topdir $TOPDIR" --with servers \
	    --with zfs --with ldiskfs $TOPDIR/SRPMS/lustre-all-dkms-$ver-*.src.rpm ||
	fatal 1 "Error building DKMS (all) .rpm for $TARGET_ARCH."
    fi

    return 0
}

###
# build_spl_zfs
#
# Fetch spl/zfs from the git repo and prepare for lustre build
#
# Overrides:
#   SPLZFSGITREPO - URI of directory where spl.git and zfs.git are located
#   SPLZFSTAG     - Tag to checkout of clone repositories
#   SPLZFSVER     - Version to checkout of both (format zfs/spl-$SPLZFSVER)
#
# return 0 if successful, else 255
build_spl_zfs() {
    # make sure the RPM build environment is set up
    pushd $TOPDIR
    create_rpmbuild_dirs
    popd

    # The spl/zfs spec files expect RPM_BUILD_ROOT to point to the root of the
    # destination for the rpms
    export RPM_BUILD_ROOT=$TOPDIR
    SPLZFSVER=${SPLZFSVER:-0.7.9}
    SPLZFSTAG=${SPLZFSTAG:-}

    # The files expect a kver to be set to the kernel version .
    local kver=$(find_linux_release)

    # build and install the spl and zfs (and -devel) RPMs for lustre to use
    local pkg
    for pkg in spl zfs; do

        local rpmpkg

        [ "$pkg" == "zfs" ] && spldir="$(ls -d $TOPDIR/usr/src/spl-*|tail -1)"

        # need to fetch the repo in order to build it.
        # default to github but allow override
	git clone -n ${SPLZFSGITREPO:-"https://github.com/zfsonlinux"}/$pkg.git $pkg 2>&1

	pushd $pkg || return 255
	local tag
	if [ -n "$SPLZFSTAG" ]; then
	    tag=$SPLZFSTAG
	else
	    tag=$pkg-$SPLZFSVER
	fi
	git checkout -b lbuild $tag || fatal 1 "Failed to checkout \"$tag\" for $pkg.git"

        # This differentiates between older zfs versions
        if [ -f $pkg-modules.spec.in ]; then
            rpmpkg=$pkg-modules
            specdir=.
            speclist="$pkg.spec $rpmpkg.spec"
        else
            rpmpkg=kmod-$pkg-devel
            specdir=rpm/generic
            speclist="$pkg.spec $pkg-kmod.spec $pkg-dkms.spec"
        fi

        sh autogen.sh || return 255

        if  ! ./configure --with-linux=${LINUX} --with-linux-obj=${LINUXOBJ:-$LINUX} \
                          ${spldir:+--with-spl="${spldir}"} 2>&1 ||
            ! make dist 2>&1; then
            popd
            return 255
        fi
        popd

        ln -f $pkg/$pkg-*.tar.gz $TOPDIR/SOURCES ||
           error "failed to link $pkg/$pkg-*.tar.gz into $TOPDIR/SOURCES"
        if [ -f $pkg/scripts/kmodtool ]; then
            ln -f $pkg/scripts/kmodtool $TOPDIR/SOURCES/
        fi

        local rpmb
        if $DO_SRC; then
            rpmb=-ba
        else
            rpmb=-bb
        fi

        # set search dir for our own kmodtool to find correct
        # directories
        export KERNELSOURCE=$(dirname ${LINUX})
        # Manually build rpms
        for spec in $speclist; do
            echo "Building RPMs from $pkg/$specdir/$spec"
            if ! rpmbuild $rpmb $pkg/$specdir/$spec \
                --nodeps -v \
                --define "_use_internal_dependency_generator 0" \
                --define "require_kdir ${LINUX}" \
                ${LINUXOBJ:+--define "require_kobj ${LINUXOBJ}"} \
                ${spldir:+--define "require_spldir ${spldir}"} \
                --define "kver $kver" \
                --define "kernels $kver" \
                --define "_tmppath /var/tmp" \
                --define "kernelbuildroot $TOPDIR/reused" \
                --define "_topdir $TOPDIR" 2>&1; then
                return 255
            fi
        done

        # We have built the rpms for the package. Now we need to extract the
        # contained files so we can build further things against them
        local rpms=$(ls -1 $TOPDIR/RPMS/*/$rpmpkg-*.rpm)

        # cpio only extract to pwd so we need to go there.
        pushd $TOPDIR
        local rpm
        for rpm in $rpms; do
            rpm2cpio $rpm | cpio -id
        done

        if [ "$pkg" == "zfs" ]; then
            # We also need to extract both the zfs and zfs-devel rpms
            # the zfs rpm is needed because it has the actual libraries in
            # it and the zfs-devel rpm only has unversioned symlinks to the
            # libraries in the zfs rpm
            # this will all change one day when we have a libzfs rpm per
            # https://github.com/zfsonlinux/zfs/issues/2329
            # and it looks like it could be one day soon:
            # https://github.com/zfsonlinux/zfs/pull/2341
            local devel_rpms=$(ls -1 $TOPDIR/RPMS/*/{$pkg-devel,$pkg-$SPLZFSVER,lib*}-*.rpm)
            for rpm in $devel_rpms; do
                rpm2cpio $rpm | cpio -id
            done
            CONFIGURE_FLAGS="--with-$pkg-devel=$TOPDIR ${CONFIGURE_FLAGS}"
        fi
        popd

        CONFIGURE_FLAGS="--with-$pkg=$(ls -d $TOPDIR/usr/src/$pkg-*|tail -1) ${CONFIGURE_FLAGS}"
        CONFIGURE_FLAGS="--with-$pkg-obj=$(ls -d $TOPDIR/usr/src/$pkg-*/$kver*|tail -1) ${CONFIGURE_FLAGS}"
    done

    OSDZFSRPM=true

    return 0
}

stage() {

    [ "$STAGEDIR" ] || return 0

    rpmdir="${STAGEDIR}/${CANONICAL_TARGET}-${TARGET_ARCH}"
    echo "${0##*/}: Copying RPMs into ${rpmdir}"
    mkdir -p "${rpmdir}"
    for rpm in $(ls RPMS/${TARGET_ARCH}/*.rpm RPMS/noarch/*.rpm); do
        cp -v $rpm "${rpmdir}"
    done

    cp -v "$LUSTRE" "$STAGEDIR"

}

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 $PPC64_ARCHS; do
        [ $infact_arch == $smp_type ] && RPMSMPTYPE=ppc64 && break
    done

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

}

# This function takes a linux include tree and digs out the linux release
# from it. It is never called directly, only called from the distro
# specific function find_linux_release() in lbuild-{rhel,sles}.
_find_linux_release() {
    local SRC="$1"
    local LINUXRELEASEHEADER=""

    LINUXRELEASEHEADER=$SRC/include/linux/version.h
    if [ -s $SRC/include/generated/utsrelease.h ]; then
        LINUXRELEASEHEADER=$SRC/include/generated/utsrelease.h
    elif [ -s $SRC/include/linux/utsrelease.h ]; then
        LINUXRELEASEHEADER=$SRC/include/linux/utsrelease.h
    fi

    if [ ! -s $LINUXRELEASEHEADER ]; then
        fatal 1 "could not find UTS_RELEASE"
    fi

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

# unpack kernel(/source/devel) RPM
#
unpack_linux_devel_rpm() {
    local kernelrpm="${1}"

    [ -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-$DISTROMAJ; then
        if ! unpack_linux_devel_rpm-$DISTROMAJ "$kernelrpm"; then
            return 255
        fi
    fi

    popd &>/dev/null

    find_linux_devel_paths $TOPDIR/reused

    return 0

}

build_kernel_ib() {
    local linux="$1"
    local kib_prefix="$2"
    local kib_rpm="$3"
    local ofed_type="${4}"
    local ofed_version="${5}"

    # build kernel-ib{,-devel}/compat-rdma{,-devel}
    local K_SRC="K_SRC"

	local OFED_CORE="--with-core-mod --with-ipoib-mod --with-user_mad-mod \
	--with-user_access-mod --with-addr_trans-mod --with-innova-flex "
	local OFED_HARDWARE="--with-mlx4-mod --with-mlx4_en-mod \
	--with-srp-mod --with-iser-mod --with-isert-mod --with-mlx5-mod \
	--with-mlxfw-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

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

    # but switch to building from the SPEC if we need to apply patches
    if ls ${TOPDIR}/lustre/contrib/patches/ofed/* >/dev/null; then
        BUILD_TYPE="-bb"
        rpm --define "_topdir ${TOPDIR}" -ivh $SOURCE
        SOURCE="${TOPDIR}/SPECS/${kib_prefix}.spec"
        local file ed_fragment1 ed_fragment2 n=1
        for file in $(ls ${TOPDIR}/lustre/contrib/patches/ofed/*.patch); do
            ed_fragment1="$ed_fragment1
Patch$n: ${file%%*/}"
            ed_fragment2="$ed_fragment2
%patch$n -p0"
            cp $file ${TOPDIR}/SOURCES
            let n=$n+1
        done
        for file in $(ls ${TOPDIR}/lustre/contrib/patches/ofed/*.ed); do
            # Only apply the ed-scripts that should be used for the canonical target
            # ed-files in ${TOPDIR}/lustre/contrib/patches/ofed/ have to follow the naming
            # convention
            # <two-digits>-<descriptive-name>:<canonical_target_1>: ...:<canonical_target_N>.ed
            # To apply the same change to multiple canonical target simply specify
            # a list of colon separated canoncial target names in the file name.
            echo "$file" | grep -q -e ":${CANONICAL_TARGET}:" \
                                   -e ":${CANONICAL_TARGET}.ed$"
            if [ $? -eq 0 ] ; then
                ed_fragment3="$ed_fragment3
$(cat $file)"
                let n=$n+1
            fi
        done

        if [ $n -gt 1 ]; then
            ed $SOURCE <<EOF
/^Source: /a
$ed_fragment1
.
/^%setup /a
$ed_fragment2
.
$ed_fragment3
wq
EOF
        fi
    fi

    local linuxrelease=$(find_linux_release)
	# a place to change/add any unique config
	case $ofed_type in
		ofa|ifs) local K_SRC_OBJ="K_SRC_OBJ"
		if ! $RPMBUILD $BUILD_TYPE --define 'build_kernel_ib 1' \
			--define 'build_kernel_ib_devel 1' \
			${FIND_REQUIRES:+--define "__find_requires $FIND_REQUIRES"} \
			--define "_topdir ${TOPDIR}" --target ${TARGET_ARCH} \
			--define "KVERSION ${linuxrelease}" \
			--define "$K_SRC ${linux}" \
			${K_SRC_OBJ:+--define "$K_SRC_OBJ ${linux}"} \
			${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 ${kib_rpm}"
		fi
		;;
		mlnx)
		if ! $RPMBUILD $BUILD_TYPE \
			${FIND_REQUIRES:+--define "__find_requires $FIND_REQUIRES"} \
			--define "_topdir ${TOPDIR}" --target ${TARGET_ARCH} \
			--define "KVERSION ${linuxrelease}" \
			--define "KMP 1" \
			--define "$K_SRC ${linux}" \
			${OFA_KERNEL_RELEASE:+--define "_release $OFA_KERNEL_RELEASE"} \
			${SOURCE} 2>&1; then
			fatal 1 "Error building ${kib_rpm}"
		fi
		# now that we have the kernel rpms, we need to lib rpms too
		# we don't have to rebuild since MOFED include the binaries
		cp -f OFED_RPMS/{libibmad-*,libibverbs-*,libibumad-*,librdmacm*,ibutils-*,opensm-*}.${TARGET_ARCH}.rpm \
			${TOPDIR}/RPMS/${TARGET_ARCH} || \
			fatal 1 "Failed to copy MOFED rpms"
		;;
	esac

}

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

    local unique_id=$(hostname -s)
    if [ -z "$unique_id" ]; then
        fatal 1 "Failed to determine hostname."
    fi

    local finallocation="$location"/"$signature"/"$module"
    location="$location"/"$signature-${unique_id}"/"$module"
    mkdir -p "$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"

    # put the temporary location into the final location
    # (last one wins)
    mkdir -p "${finallocation%/*}"
    mv "$location" "$finallocation"
    rmdir "${location%/*}"
    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

}

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
    local release_str
    if $RELEASE; then
        local release_str="RELEASE=$RELEASE\n"
    fi

    if $USE_BUILD_CACHE && [ -n "$REUSEBUILD" ]; then
        local REUSE_SIGNATURE=$({ echo -en $release_str;
                                  echo $BUILD_GEN;
                                  cat "$CONFIG_FILE";
                                  cat "$TARGET_FILE" |
                                  sed -e '/_VERSION=/s/_[0-9]*_g.*$//g';
                                  cat "$FULL_PATCH";
                                  cat "$LBUILD_DIR/lbuild";
                                  cat "$LBUILD_DIR/lbuild-$DISTROMAJ"; } |
                                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/$$
    fi

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

        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"

        if [ -z "$REUSE_SIGNATURE" ]; then
            echo "No reuse signature was caculated so not storing the built kernel" >&${outfd}
        else
            # store the resulting kernel RPM build tree for future use
            echo "Storing the built kernel for future reuse" >&${outfd}
            if ! store_for_reuse "$TOPDIR/{SPECS,SOURCES,SRPMS,RPMS}" \
                                 "kernel" "$REUSEBUILD" "$REUSE_SIGNATURE" \
                                 "$CAN_LINK_FOR_REUSE"; then
                error "Failed to store kernel RPMS for reuse"
                echo "unknown" >&${outfd}
                return 1
            fi
        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(-default)? ="); 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 OFED
# globals used:
#    TOPDIR
#    REUSEBUILD, USE_BUILD_CACHE
#    CONFIGURE_FLAGS

build_ofed() {
	local linux="$1"
	local ofed_type="$2"
	local ofed_version="$3"
	local kib_prefix
	local kib_rpm
	local pre_prefix
	local o2ib_location
	local rpm

    if [ "$ofed_version" = "inkernel" ]; then
        # see if there is a distro specific override for this and use
        # that if it exists
        # XXX we need to better integrate a distro specific override with
        #     the rest of this function so that all of the reuse cache
        #     stuff is leveraged given that 80% of this function is reuse
        if type -p build_ofed-$DISTROMAJ; then
            local ofed_location
            ofed_location=$(build_ofed-$DISTROMAJ ${STDOUT})
            local rc=${PIPESTATUS[0]}
            CONFIGURE_FLAGS="--with-o2ib=${ofed_location} ${CONFIGURE_FLAGS}"
            return $rc
        else
            return 0
        fi
	else
		case $ofed_type in
			mlnx) # no compat-rdma for mlnx as of 3.1
				kib_prefix="ofa_kernel"
				pre_prefix="mlnx-"
				kib_rpm="${pre_prefix}${kib_prefix}"
				;;
			ofa|ifs)
				if compare_version $ofed_version 3.0; then
					kib_prefix="ofa_kernel"
					kib_rpm="${pre_prefix}${kib_prefix}"
				else
					kib_prefix="compat-rdma"
					kib_rpm="compat-rdma"
				fi
				;;
		esac
	fi

    # build kernel-ib/compat-rdma
    if $USE_BUILD_CACHE && [ -n "$REUSEBUILD" ]; then
        local REUSE_SIGNATURE=$({ echo "$ofed_version";
                                  echo "$(find_linux_release;
                                  echo "$BUILD_GEN")";
                                  cat "${linux}/include/linux/autoconf.h";
                                  cat "$LBUILD_DIR/lbuild";
                                  cat "$LBUILD_DIR/lbuild-$DISTROMAJ"; } |
                                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/; then
            CAN_LINK_FOR_REUSE=true
        fi
        rm $REUSEBUILD/$$
    fi

    if ! $USE_BUILD_CACHE || ! reuse ofed "$TOPDIR" "$CAN_LINK_FOR_REUSE" \
                                   "$REUSE_SIGNATURE"; then
        if [ -n "$REUSE_SIGNATURE" ]; then
            # stash away the existing built articles for a moment
            mkdir bak
            mv {BUILD,{S,}RPMS,S{OURCE,PEC}S} bak
            function mv_back {
                pushd bak
                find . | cpio -pudlm ..
                popd
                rm -rf bak
            }
            create_rpmbuild_dirs
        fi
        # build it
	build_kernel_ib "${linux}" "${pre_prefix}${kib_prefix}" "${kib_rpm}" "${ofed_type}"

        if [ -z "$REUSE_SIGNATURE" ]; then
            echo "No reuse signature was caculated so not storing the built ofed"
        else
            # store the resulting RPM build tree for future use
            echo "Storing the built ofed for future reuse"
            if ! store_for_reuse "$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
    fi

    pushd "$TOPDIR" >/dev/null
    rm -rf ${kib_rpm}-devel
    mkdir ${kib_rpm}-devel
    cd ${kib_rpm}-devel

	o2ib_location="$(pwd)/usr/src/${kib_prefix}"
	case $ofed_type in
		mlnx) # Prior to MOFED 3.1, we had to use build_kernel_ib=1 to
		      # build devel rpm. not so after 3.1
			if compare_version $ofed_version 3.0; then
				rpm=$(ls $TOPDIR/RPMS/*/kernel-ib-devel-${ofed_version%%-*}-*.rpm)
			else
				rpm=$(ls $TOPDIR/RPMS/*/${kib_rpm}-devel-${ofed_version%%-*}-*.rpm)
			fi
			o2ib_location="${o2ib_location}/default"
			;;
		ofa) # Prior to OFA 3.18, we had to use build_kernel_ib=1 during configure,
		     # not so after 3.18
			if compare_version $ofed_version 3.18; then
				rpm=$(ls $TOPDIR/RPMS/*/kernel-ib-devel-${ofed_version%%-*}-*.rpm)
			else
				rpm=$(ls $TOPDIR/RPMS/*/${kib_rpm}-devel-${ofed_version%%-*}-*.rpm)
			fi
			;;
		ifs) # ifs doesn't follow any convention (if any)
			rpm=$(ls $TOPDIR/RPMS/*/${kib_rpm}-devel-*.rpm)
			;;
	esac

	if ! rpm2cpio < $rpm | cpio -id; then
		fatal 1 "could not unpack the $rpm."
	fi
	CONFIGURE_FLAGS="--with-o2ib=${o2ib_location} ${CONFIGURE_FLAGS}"
	popd >/dev/null

}

build_with_srpm() {
	local ofed_type="$1"
	local ofed_version="$2"
	local kernelrpm

	if ! $PATCHLESS; then
		if $PATCHLESS_SERVER; then
			# need to find and unpack the vendor's own kernel-devel
			# for patchless server build
			if ! kernelrpm=$(find_linux_rpm "-$DEVEL_KERNEL_TYPE"); then
				fatal 1 "Could not find the kernel-$DEVEL_KERNEL_TYPE RPM in $KERNELRPMSBASE/$lnxmaj/$DISTROMAJ"
			fi
			if ! lnxrel="$lnxrel" unpack_linux_devel_rpm "$kernelrpm" "-"; then
				fatal 1 "Could not find the Linux tree in $kernelrpm"
			fi
			# download and unpack kernel-debuginfo-common (only in EL)
			if [[ $DISTROMAJ =~ rhel ]]; then
				local KERNEL_DEBUGINFO="kernel-debuginfo-common-${TARGET_ARCH}-${lnxmaj}-${lnxrel}.${TARGET_ARCH}.rpm"
				download_debuginfo_common "$KERNEL_DEBUGINFO"
				if ! lnxrel="$lnxrel" unpack_linux_devel_rpm \
					"$KERNELRPMSBASE/$lnxmaj/$DISTROMAJ/$TARGET_ARCH/$KERNEL_DEBUGINFO"; then
					fatal 1 "Could not find the Linux debuginfo common rpm in $KERNELRPMSBASE/$lnxmaj/$DISTROMAJ/$TARGET_ARCH/$KERNEL_DEBUGINFO"
				fi
			fi
		else
			local kernel_extra_version
			if ! kernel_extra_version=$(build_kernel_with_srpm ${STDOUT}); then
				fatal 1 "Failed to build the kernel from it's SRPM"
			fi

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

			# install the -devel RPM in preparation for modules builds
			if ! lnxrel="$kernel_extra_version" unpack_linux_devel_rpm \
				"$TOPDIR/RPMS/${TARGET_ARCH}/$kernel_devel_rpm"; then
				fatal 1 "Could not find the Linux tree in $TOPDIR/RPMS/${TARGET_ARCH}/$kernel_devel_rpm"
			fi
		fi
	else
		# need to find and unpack the vendor's own kernel-devel for patchless
		# client build
		if ! kernelrpm=$(find_linux_rpm "-$DEVEL_KERNEL_TYPE"); then
			fatal 1 "Could not find the kernel-$DEVEL_KERNEL_TYPE RPM in $KERNELRPMSBASE/$lnxmaj/$DISTROMAJ"
		fi
		if ! lnxrel="$lnxrel" unpack_linux_devel_rpm "$kernelrpm" "-"; then
			fatal 1 "Could not find the Linux tree in $kernelrpm"
		fi
	fi

    # ~sigh~  have to make copies of and modify some of the rpm
    # infrastructure files so that find-requires can find our unpacked
    # kernel-devel artifacts
    cp $RPM_HELPERS_DIR/{symset-table,find-requires{,.ksyms}} .
    export FIND_REQUIRES="$(pwd)/find-requires"
    chmod 755 {symset-table,find-requires{,.ksyms}}
    local tmp="$(pwd)"
    tmp="${tmp//\//\\/}"
    ed find-requires <<EOF
1a
set -x
.
/|.*find-requires.ksyms/s/|/| bash -x/
g/ [^ ]*\/\(find-requires\.ksyms\)/s// $tmp\/\1/g
wq
EOF
    ed find-requires.ksyms <<EOF
1a
set -x
.
g/\/.*\/\(symset-table\)/s//$tmp\/\1/g
g/\(\/usr\/src\/kernels\/\)/s//$tmp\/reused\1/g
wq
EOF
    ed symset-table <<EOF
1a
set -x
.
g/\(\/boot\/\)/s//$tmp\/reused\1/g
g/\(\/usr\/src\/kernels\/\)/s//$tmp\/reused\1/g
wq
EOF

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

    # 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's 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?
        local dir
        for dir in RPMS/*; do
            pushd $dir
            for file in $(ls); do
                if [ -h $file ]; then
                    cp $file foo
                    mv foo $file
                fi
            done
            popd
        done
        # also, for i?86, make sure all of the RPMs are in RPMS/$TARGET_ARCH
        # as that's where LTS expects to find them
        for dir in RPMS/*; do
            if [ $dir = RPMS/$TARGET_ARCH ]; then
                continue
            fi
            pushd $dir
            local files=$(ls)
            if [ -n "$files" ]; then
                cp -al $files ../$TARGET_ARCH
            fi
            popd
        done
    else
        return 1
    fi

}

create_rpmbuild_dirs() {

	[ -d RPMS ] || mkdir RPMS
	[ -d RPMS/${TARGET_ARCH} ] || mkdir RPMS/${TARGET_ARCH}
	[ -d RPMS/noarch ] || mkdir RPMS/noarch
	[ -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
) ; set $xtrace' ERR
set -E

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

options=$(getopt -o D:h -l kerneltree:,distro:,kernelrpm:,reusebuild:,\
patchless,patchless-server,ccache,norpm,external-patches:,timestamp:,\
extraversion:,kerneldir:,linux:,lustre:,nodownload,nosrc,noiokit,ofed-type:,\
ofed-version:,mlnx-version:,ofed-src:,publish,disable-zfs,release,set-value:,\
src,stage:,target:,with-linux:,xen -- "$@")

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

eval set -- "$options"

while [ "$1" ]; do
    case "$1" in
        '')
            usage 1
            ;;
        --ccache)
            CCACHE='ccache'
            shift
            ;;
        -D)
            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=$2
            shift 2
            ;;
        --reusebuild)
            if ! REUSEBUILD=$(canon_path "$2"); then
                fatal 1 "Could not determine the canonical location of $2"
            fi
            shift 2
            ;;
        --norpm)
            shift
            ;;
        --noiokit)
            IOKITRPM=false
            shift
            ;;
        --patchless)
            PATCHLESS=true
            shift
            ;;
	--patchless-server)
		PATCHLESS_SERVER=true
		shift
		;;
        --kernelrpm)
            if ! KERNELRPMSBASE=$(canon_path "$2"); then
                fatal 1 "Could not determine the canonical location of $2"
            fi
            shift 2
            ;;
        --timestamp)
            TIMESTAMP=$2
            shift 2
            ;;
        --lustre)
            if ! LUSTRE=$(canon_filepath "$2"); then
                fatal 1 "Could not determine the canonical location of $2"
            fi
            shift 2
            ;;
        --nodownload)
            DOWNLOAD=false
            shift 1
            ;;
        --nosrc)
            DO_SRC=false
            shift 1
            ;;
        --ofed-version)
            OFED_VERSION="$2"
            shift 2
            ;;
	--ofed-type)
		OFED_TYPE="$2"
		shift 2
		;;
	--ofed-src)
		OFED_SRC="$2"
		shift 2
		;;
        --publish)
            shift
            ;;
	--disable-zfs)
	    WITH_ZFS="no"
	    shift
	    ;;
        --release)
            RELEASE=true
            shift
            ;;
        --src)
            DO_SRC=true
            shift 1
            ;;
        --stage)
            STAGEDIR=$2
            shift 2
            ;;
        --target)
            TARGET=$2
            shift 2
            ;;
        --xen)
            XEN=true
            shift
            ;;
        --set-value)
            eval $2
            shift 2
            ;;
        --)
            shift
            # there are actually some lustre configure flags that we need to
            # handle ourselves (but we still give them to configure)
            if [[ \ $@\  == *\ --disable-tests\ * ]]; then
                LUSTRE_TESTS=false
            fi
            CONFIGURE_FLAGS=$@
            break
            ;;
        *)
            usage 1 "Unrecognized option: $1"
            ;;
    esac
done

check_options

unpack_lustre

load_target

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

# make sure the RPM build environment is set up
create_rpmbuild_dirs

# 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
    find_linux_release() {
        _find_linux_release $LINUX
    }
	build_ofed "${LINUXOBJ:-$LINUX}" "$OFED_TYPE" "$OFED_VERSION" ||
        fatal 1 "error building OFED"
    build_lustre "$LINUX" "$LINUXOBJ"
else
    if [ ! -f "${LBUILD_DIR}/lbuild-$DISTROMAJ" ]; then
        fatal 1 "${LBUILD_DIR}/lbuild-$DISTROMAJ not found"
    fi
    source ${LBUILD_DIR}/lbuild-$DISTROMAJ
	build_with_srpm "$OFED_TYPE" "$OFED_VERSION" || fatal 1 "Failed to build_with_srpm"
fi

stage