# This file contains some usefull common functions

# Copyright 2007 Yann E. MORIN

# Licensed under the GPL v2. See COPYING in the root of this package

# Prepare the fault handler

CT_OnError() {

    ret=$?

    # Bail out early in subshell, the upper level shell will act accordingly.

    [ ${BASH_SUBSHELL} -eq 0 ] || exit $ret

    CT_DoLog ERROR "Build failed in step '${CT_STEP_MESSAGE[${CT_STEP_COUNT}]}'"

    for((step=(CT_STEP_COUNT-1); step>1; step--)); do

        CT_DoLog ERROR "      called in step '${CT_STEP_MESSAGE[${step}]}'"

    done

    CT_DoLog ERROR "Error happened in '${BASH_SOURCE[1]}' in function '${FUNCNAME[1]}' (line unknown, sorry)"

    for((depth=2; ${BASH_LINENO[$((${depth}-1))]}>0; depth++)); do

        CT_DoLog ERROR "      called from '${BASH_SOURCE[${depth}]}' at line # ${BASH_LINENO[${depth}-1]} in function '${FUNCNAME[${depth}]}'"

    done

    [ "${CT_LOG_TO_FILE}" = "y" ] && CT_DoLog ERROR "Look at '${CT_LOG_FILE}' for more info on this error."

    CT_STEP_COUNT=1

    CT_DoEnd ERROR

    exit $ret

}

# Install the fault handler

trap CT_OnError ERR

# Inherit the fault handler in subshells and functions

set -E

# Make pipes fail on the _first_ failed command

# Not supported on bash < 3.x, but we need it, so drop the obsoleting bash-2.x

set -o pipefail

# Don't hash commands' locations, and search every time it is requested.

# This is slow, but needed because of the static/shared core gcc which shall

# always match to shared if it exists, and only fallback to static if the

# shared is not found

set +o hashall

# Log policy:

#  - first of all, save stdout so we can see the live logs: fd #6

exec 6>&1

#  - then point stdout to the log file (temporary for now)

tmp_log_file="${CT_TOP_DIR}/log.$$"

exec >>"${tmp_log_file}"

# The different log levels:

CT_LOG_LEVEL_ERROR=0

CT_LOG_LEVEL_WARN=1

CT_LOG_LEVEL_INFO=2

CT_LOG_LEVEL_EXTRA=3

CT_LOG_LEVEL_DEBUG=4

CT_LOG_LEVEL_ALL=5

# Make it easy to use \n and !

CR=$(printf "\n")

BANG='!'

# A function to log what is happening

# Different log level are available:

#   - ERROR:   A serious, fatal error occurred

#   - WARN:    A non fatal, non serious error occurred, take your responsbility with the generated build

#   - INFO:    Informational messages

#   - EXTRA:   Extra informational messages

#   - DEBUG:   Debug messages

#   - ALL:     Component's build messages

# Usage: CT_DoLog <level> [message]

# If message is empty, then stdin will be logged.

CT_DoLog() {

    local max_level LEVEL level cur_l cur_L

    local l

    eval max_level="\${CT_LOG_LEVEL_${CT_LOG_LEVEL_MAX}}"

    # Set the maximum log level to DEBUG if we have none

    [ -z "${max_level}" ] && max_level=${CT_LOG_LEVEL_DEBUG}

    LEVEL="$1"; shift

    eval level="\${CT_LOG_LEVEL_${LEVEL}}"

    if [ $# -eq 0 ]; then

        cat -

    else

        echo "${@}"

    fi |( IFS="${CR}" # We want the full lines, even leading spaces

          _prog_bar_cpt=0

          _prog_bar[0]='/'

          _prog_bar[1]='-'

          _prog_bar[2]='\'

          _prog_bar[3]='|'

          indent=$((2*CT_STEP_COUNT))

          while read line; do

              case "${CT_LOG_SEE_TOOLS_WARN},${line}" in

                y,*"warning:"*)         cur_L=WARN; cur_l=${CT_LOG_LEVEL_WARN};;

                y,*"WARNING:"*)         cur_L=WARN; cur_l=${CT_LOG_LEVEL_WARN};;

                *"error:"*)             cur_L=ERROR; cur_l=${CT_LOG_LEVEL_ERROR};;

                *"make["*"]: *** ["*)   cur_L=ERROR; cur_l=${CT_LOG_LEVEL_ERROR};;

                *)                      cur_L="${LEVEL}"; cur_l="${level}";;

              esac

              # There will always be a log file (stdout, fd #1), be it /dev/null

              printf "[%-5s]%*s%s%s\n" "${cur_L}" "${indent}" " " "${line}"

              if [ ${cur_l} -le ${max_level} ]; then

                  # Only print to console (fd #6) if log level is high enough.

                  printf "\r[%-5s]%*s%s%s\n" "${cur_L}" "${indent}" " " "${line}" >&6

              fi

              if [ "${CT_LOG_PROGRESS_BAR}" = "y" ]; then

                  printf "\r[%02d:%02d] %s " $((SECONDS/60)) $((SECONDS%60)) "${_prog_bar[$((_prog_bar_cpt/10))]}" >&6

                  _prog_bar_cpt=$(((_prog_bar_cpt+1)%40))

              fi

          done

        )

    return 0

}

# Execute an action, and log its messages

# Usage: [VAR=val...] CT_DoExecLog <level> <command [parameters...]>

CT_DoExecLog() {

    local level="$1"

    shift

    CT_DoLog DEBUG "==> Executing: '${@}'"

    "${@}" 2>&1 |CT_DoLog "${level}"

}

# Tail message to be logged whatever happens

# Usage: CT_DoEnd <level>

CT_DoEnd()

{

    local level="$1"

    CT_STOP_DATE=$(CT_DoDate +%s%N)

    CT_STOP_DATE_HUMAN=$(CT_DoDate +%Y%m%d.%H%M%S)

    if [ "${level}" != "ERROR" ]; then

        CT_DoLog "${level:-INFO}" "Build completed at ${CT_STOP_DATE_HUMAN}"

    fi

    elapsed=$((CT_STOP_DATE-CT_STAR_DATE))

    elapsed_min=$((elapsed/(60*1000*1000*1000)))

    elapsed_sec=$(printf "%02d" $(((elapsed%(60*1000*1000*1000))/(1000*1000*1000))))

    elapsed_csec=$(printf "%02d" $(((elapsed%(1000*1000*1000))/(10*1000*1000))))

    CT_DoLog ${level:-INFO} "(elapsed: ${elapsed_min}:${elapsed_sec}.${elapsed_csec})"

}

# Abort the execution with an error message

# Usage: CT_Abort <message>

CT_Abort() {

    CT_DoLog ERROR "$1"

    exit 1

}

# Test a condition, and print a message if satisfied

# Usage: CT_Test <message> <tests>

CT_Test() {

    local ret

    local m="$1"

    shift

    test "$@" && CT_DoLog WARN "$m"

    return 0

}

# Test a condition, and abort with an error message if satisfied

# Usage: CT_TestAndAbort <message> <tests>

CT_TestAndAbort() {

    local m="$1"

    shift

    test "$@" && CT_Abort "$m"

    return 0

}

# Test a condition, and abort with an error message if not satisfied

# Usage: CT_TestAndAbort <message> <tests>

CT_TestOrAbort() {

    local m="$1"

    shift

    test "$@" || CT_Abort "$m"

    return 0

}

# Test the presence of a tool, or abort if not found

# Usage: CT_HasOrAbort <tool>

CT_HasOrAbort() {

    CT_TestAndAbort "'${1}' not found and needed for successful toolchain build." -z "$(CT_Which "${1}")"

    return 0

}

# Search a program: wrap "which" for those system where

# "which" verbosely says there is no match (Mandriva is

# such a sucker...)

# Usage: CT_Which <filename>

CT_Which() {

  which "$1" 2>/dev/null || true

}

# Get current date with nanosecond precision

# On those system not supporting nanosecond precision, faked with rounding down

# to the highest entire second

# Usage: CT_DoDate <fmt>

CT_DoDate() {

    date "$1" |sed -r -e 's/%N$/000000000/;'

}

CT_STEP_COUNT=1

CT_STEP_MESSAGE[${CT_STEP_COUNT}]="<none>"

# Memorise a step being done so that any error is caught

# Usage: CT_DoStep <loglevel> <message>

CT_DoStep() {

    local start=$(CT_DoDate +%s%N)

    CT_DoLog "$1" "================================================================="

    CT_DoLog "$1" "$2"

    CT_STEP_COUNT=$((CT_STEP_COUNT+1))

    CT_STEP_LEVEL[${CT_STEP_COUNT}]="$1"; shift

    CT_STEP_START[${CT_STEP_COUNT}]="${start}"

    CT_STEP_MESSAGE[${CT_STEP_COUNT}]="$1"

    return 0

}

# End the step just being done

# Usage: CT_EndStep

CT_EndStep() {

    local stop=$(CT_DoDate +%s%N)

    local duration=$(printf "%032d" $((stop-${CT_STEP_START[${CT_STEP_COUNT}]})) |sed -r -e 's/([[:digit:]]{2})[[:digit:]]{7}$/\.\1/; s/^0+//; s/^\./0\./;')

    local elapsed=$(printf "%02d:%02d" $((SECONDS/60)) $((SECONDS%60)))

    local level="${CT_STEP_LEVEL[${CT_STEP_COUNT}]}"

    local message="${CT_STEP_MESSAGE[${CT_STEP_COUNT}]}"

    CT_STEP_COUNT=$((CT_STEP_COUNT-1))

    CT_DoLog "${level}" "${message}: done in ${duration}s (at ${elapsed})"

    return 0

}

# Pushes into a directory, and pops back

CT_Pushd() {

    pushd "$1" >/dev/null 2>&1

}

CT_Popd() {

    popd >/dev/null 2>&1

}

# Creates a temporary directory

# $1: variable to assign to

# Usage: CT_MktempDir foo

CT_MktempDir() {

    # Some mktemp do not allow more than 6 Xs

    eval "$1"=$(mktemp -q -d "${CT_BUILD_DIR}/tmp.XXXXXX")

    CT_TestOrAbort "Could not make temporary directory" -n "${!1}" -a -d "${!1}"

    CT_DoLog DEBUG "Made temporary directory '${!1}'"

    return 0

}

# Removes one or more directories, even if it is read-only, or its parent is

# Usage: CT_DoForceRmdir dir [...]

CT_DoForceRmdir() {

    local dir

    local mode

    for dir in "${@}"; do

        [ -d "${dir}" ] || continue

        mode="$(stat -c '%a' "$(dirname "${dir}")")"

        CT_DoExecLog ALL chmod u+w "$(dirname "${dir}")"

        CT_DoExecLog ALL chmod -R u+w "${dir}"

        CT_DoExecLog ALL rm -rf "${dir}"

        CT_DoExecLog ALL chmod ${mode} "$(dirname "${dir}")"

    done

}

# Echoes the specified string on stdout until the pipe breaks.

# Doesn't fail

# $1: string to echo

# Usage: CT_DoYes "" |make oldconfig

CT_DoYes() {

    yes "$1" || true

}

# Get the file name extension of a component

# Usage: CT_GetFileExtension <component_name-component_version> [extension]

# If found, echoes the extension to stdout

# If not found, echoes nothing on stdout.

CT_GetFileExtension() {

    local ext

    local file="$1"

    shift

    local first_ext="$1"

    # we need to also check for an empty extension for those very

    # peculiar components that don't have one (such as sstrip from

    # buildroot).

    for ext in ${first_ext} .tar.gz .tar.bz2 .tgz .tar ''; do

        if [ -f "${CT_TARBALLS_DIR}/${file}${ext}" ]; then

            echo "${ext}"

            break

        fi

    done

    return 0

}

# Download an URL using wget

# Usage: CT_DoGetFileWget <URL>

CT_DoGetFileWget() {

    # Need to return true because it is legitimate to not find the tarball at

    # some of the provided URLs (think about snapshots, different layouts for

    # different gcc versions, etc...)

    # Some (very old!) FTP server might not support the passive mode, thus

    # retry without

    # With automated download as we are doing, it can be very dangerous to use

    # -c to continue the downloads. It's far better to simply overwrite the

    # destination file

    # Some company networks have firewalls to connect to the internet, but it's

    # not easy to detect them, and wget does not timeout by default while

    # connecting, so force a global ${CT_CONNECT_TIMEOUT}-second timeout.

    CT_DoExecLog ALL wget -T ${CT_CONNECT_TIMEOUT} -nc --progress=dot:binary --tries=3 --passive-ftp "$1"    \

    || CT_DoExecLog ALL wget -T ${CT_CONNECT_TIMEOUT} -nc --progress=dot:binary --tries=3 "$1"               \

    || true

}

# Download an URL using curl

# Usage: CT_DoGetFileCurl <URL>

CT_DoGetFileCurl() {

    # Note: comments about wget method (above) are also valid here

    # Plus: no good progress indicator is available with curl,

    #       so, be silent.

    CT_DoExecLog ALL curl -s --ftp-pasv -O --retry 3 "$1" --connect-timeout ${CT_CONNECT_TIMEOUT}    \

    || CT_DoExecLog ALL curl -s -O --retry 3 "$1" --connect-timeout ${CT_CONNECT_TIMEOUT}            \

    || true

}

_wget=$(CT_Which wget)

_curl=$(CT_Which curl)

# Wrapper function to call one of curl or wget

# Usage: CT_DoGetFile <URL>

CT_DoGetFile() {

    case "${_wget},${_curl}" in

        ,)  CT_Abort "Could find neither wget nor curl";;

        ,*) CT_DoGetFileCurl "$1";;

        *)  CT_DoGetFileWget "$1";;

    esac

}

# This function tries to retrieve a tarball form a local directory

# Usage: CT_GetLocal <basename> [.extension]

CT_GetLocal() {

    local basename="$1"

    local first_ext="$2"

    local ext

    # Do we already have it in *our* tarballs dir?

    ext=$(CT_GetFileExtension "${basename}" ${first_ext})

    if [ -n "${ext}" ]; then

        CT_DoLog DEBUG "Already have '${basename}'"

        return 0

    fi

    if [ -n "${CT_LOCAL_TARBALLS_DIR}" ]; then

        CT_DoLog DEBUG "Trying to retrieve an already downloaded copy of '${basename}'"

        # We'd rather have a bzip2'ed tarball, then gzipped tarball, plain tarball,

        # or, as a failover, a file without extension.

        for ext in ${first_ext} .tar.bz2 .tar.gz .tgz .tar ''; do

            CT_DoLog DEBUG "Trying '${CT_LOCAL_TARBALLS_DIR}/${basename}${ext}'"

            if [ -r "${CT_LOCAL_TARBALLS_DIR}/${basename}${ext}" -a \

                 "${CT_FORCE_DOWNLOAD}" != "y" ]; then

                CT_DoLog DEBUG "Got '${basename}' from local storage"

                CT_DoExecLog ALL ln -s "${CT_LOCAL_TARBALLS_DIR}/${basename}${ext}" "${CT_TARBALLS_DIR}/${basename}${ext}"

                return 0

            fi

        done

    fi

    return 1

}

# This function saves the specified to local storage if possible,

# and if so, symlinks it for later usage

# Usage: CT_SaveLocal </full/path/file.name>

CT_SaveLocal() {

    local file="$1"

    local basename="${file##*/}"

    if [ "${CT_SAVE_TARBALLS}" = "y" ]; then

        CT_DoLog EXTRA "Saving '${basename}' to local storage"

        # The file may already exist if downloads are forced: remove it first

        CT_DoExecLog ALL rm -f "${CT_LOCAL_TARBALLS_DIR}/${basename}"

        CT_DoExecLog ALL mv -f "${file}" "${CT_LOCAL_TARBALLS_DIR}"

        CT_DoExecLog ALL ln -s "${CT_LOCAL_TARBALLS_DIR}/${basename}" "${file}"

    fi

}

# Download the file from one of the URLs passed as argument

# Usage: CT_GetFile <basename> [.extension] <url> [url ...]

CT_GetFile() {

    local ext

    local url URLS LAN_URLS

    local file="$1"

    local first_ext

    shift

    # If next argument starts with a dot, then this is not an URL,

    # and we can consider that it is a preferred extension.

    case "$1" in

        .*) first_ext="$1"

            shift

            ;;

    esac

    # Does it exist localy?

    CT_GetLocal "${file}" ${first_ext} && return 0 || true

    # No, it does not...

    # Are downloads allowed ?

    CT_TestAndAbort "File '${file}' not present locally, and downloads are not allowed" "${CT_FORBID_DOWNLOAD}" = "y"

    # Try to retrieve the file

    CT_DoLog EXTRA "Retrieving '${file}'"

    CT_Pushd "${CT_TARBALLS_DIR}"

    URLS="$@"

    # Add URLs on the LAN mirror

    LAN_URLS=

    if [ "${CT_USE_MIRROR}" = "y" ]; then

        CT_TestOrAbort "Please set the LAN mirror hostname" -n "${CT_MIRROR_HOSTNAME}"

        CT_TestOrAbort "Please tell me where to find tarballs on the LAN mirror '${CT_MIRROR_HOSTNAME}'" -n "${CT_MIRROR_BASE}"

        LAN_URLS="${LAN_URLS} ${CT_MIRROR_SCHEME}://${CT_MIRROR_HOSTNAME}/${CT_MIRROR_BASE}/${file%-*}"

        LAN_URLS="${LAN_URLS} ${CT_MIRROR_SCHEME}://${CT_MIRROR_HOSTNAME}/${CT_MIRROR_BASE}"

        if [ "${CT_PREFER_MIRROR}" = "y" ]; then

            CT_DoLog DEBUG "Pre-pending LAN mirror URLs"

            URLS="${LAN_URLS} ${URLS}"

        else

            CT_DoLog DEBUG "Appending LAN mirror URLs"

            URLS="${URLS} ${LAN_URLS}"

        fi

    fi

    # Scan all URLs in turn, and try to grab a tarball from there

    for ext in ${first_ext} .tar.bz2 .tar.gz .tgz .tar ''; do

        # Try all urls in turn

        for url in ${URLS}; do

            CT_DoLog DEBUG "Trying '${url}/${file}${ext}'"

            CT_DoGetFile "${url}/${file}${ext}"

            if [ -f "${file}${ext}" ]; then

                CT_DoLog DEBUG "Got '${file}' from the Internet"

                CT_SaveLocal "${CT_TARBALLS_DIR}/${file}${ext}"

                return 0

            fi

        done

    done

    CT_Popd

    CT_Abort "Could not retrieve '${file}'."

}

# Checkout from CVS, and build the associated tarball

# The tarball will be called ${basename}.tar.bz2

# Prerequisite: either the server does not require password,

# or the user must already be logged in.

# 'tag' is the tag to retrieve. Must be specified, but can be empty.

# If dirname is specified, then module will be renamed to dirname

# prior to building the tarball.

# Usage: CT_GetCVS <basename> <url> <module> <tag> [dirname]

CT_GetCVS() {

    local basename="$1"

    local uri="$2"

    local module="$3"

    local tag="${4:+-r ${4}}"

    local dirname="$5"

    local tmp_dir

    # Does it exist localy?

    CT_GetLocal "${basename}" && return 0 || true

    # No, it does not...

    # Are downloads allowed ?

    CT_TestAndAbort "File '${basename}' not present locally, and downloads are not allowed" "${CT_FORBID_DOWNLOAD}" = "y"

    CT_DoLog EXTRA "Retrieving '${basename}'"

    CT_MktempDir tmp_dir

    CT_Pushd "${tmp_dir}"

    CT_DoExecLog ALL cvs -z 9 -d "${uri}" co -P ${tag} "${module}"

    [ -n "${dirname}" ] && CT_DoExecLog ALL mv "${module}" "${dirname}"

    CT_DoExecLog ALL tar cjf "${CT_TARBALLS_DIR}/${basename}.tar.bz2" "${dirname:-${module}}"

    CT_SaveLocal "${CT_TARBALLS_DIR}/${basename}.tar.bz2"

    CT_Popd

    CT_DoExecLog ALL rm -rf "${tmp_dir}"

}

# Check out from SVN, and build the associated tarball

# The tarball will be called ${basename}.tar.bz2

# Prerequisite: either the server does not require password,

# or the user must already be logged in.

# 'rev' is the revision to retrieve

# Usage: CT_GetSVN <basename> <url> [rev]

CT_GetSVN() {

    local basename="$1"

    local uri="$2"

    local rev="$3"

    # Does it exist localy?

    CT_GetLocal "${basename}" && return 0 || true

    # No, it does not...

    # Are downloads allowed ?

    CT_TestAndAbort "File '${basename}' not present locally, and downloads are not allowed" "${CT_FORBID_DOWNLOAD}" = "y"

    CT_DoLog EXTRA "Retrieving '${basename}'"

    CT_MktempDir tmp_dir

    CT_Pushd "${tmp_dir}"

    CT_DoExecLog ALL svn export ${rev:+-r ${rev}} "${uri}" "${basename}"

    CT_DoExecLog ALL tar cjf "${CT_TARBALLS_DIR}/${basename}.tar.bz2" "${basename}"

    CT_SaveLocal "${CT_TARBALLS_DIR}/${basename}.tar.bz2"

    CT_Popd

    CT_DoExecLog ALL rm -rf "${tmp_dir}"

}

# Extract a tarball

# Some tarballs need to be extracted in specific places. Eg.: glibc addons

# must be extracted in the glibc directory; uCLibc locales must be extracted

# in the extra/locale sub-directory of uClibc. This is taken into account

# by the caller, that did a 'cd' into the correct path before calling us

# and sets nochdir to 'nochdir'.

# Usage: CT_Extract <basename> [nochdir]

CT_Extract() {

    local basename="$1"

    local nochdir="$2"

    local ext=$(CT_GetFileExtension "${basename}")

    CT_TestAndAbort "'${basename}' not found in '${CT_TARBALLS_DIR}'" -z "${ext}"

    local full_file="${CT_TARBALLS_DIR}/${basename}${ext}"

    # Check if already extracted

    if [ -e "${CT_SRC_DIR}/.${basename}.extracted" ]; then

        CT_DoLog DEBUG "Already extracted '${basename}'"

        return 0

    fi

    [ "${nochdir}" = "nochdir" ] || CT_Pushd "${CT_SRC_DIR}"

    CT_DoLog EXTRA "Extracting '${basename}'"

    case "${ext}" in

        .tar.bz2)     CT_DoExecLog ALL tar xvjf "${full_file}";;

        .tar.gz|.tgz) CT_DoExecLog ALL tar xvzf "${full_file}";;

        .tar)         CT_DoExecLog ALL tar xvf  "${full_file}";;

        *)            CT_Abort "Don't know how to handle '${basename}${ext}': unknown extension" ;;

    esac

    # Some tarballs have read-only files... :-(

    # Because of nochdir, we don't know where we are, so chmod all

    # the src tree

    CT_DoExecLog DEBUG chmod -R u+w "${CT_SRC_DIR}"

    CT_DoExecLog DEBUG touch "${CT_SRC_DIR}/.${basename}.extracted"

    [ "${nochdir}" = "nochdir" ] || CT_Popd

}

# Patches the specified component

# Usage: CT_Patch <basename> [nochdir]

CT_Patch() {

    local basename="$1"

    local nochdir="$2"

    local base_file="${basename%%-*}"

    local ver_file="${basename#*-}"

    local official_patch_dir

    local custom_patch_dir

    # Check if already patched

    if [ -e "${CT_SRC_DIR}/.${basename}.patched" ]; then

        CT_DoLog DEBUG "Already patched '${basename}'"

        return 0

    fi

    # Check if already partially patched

    if [ -e "${CT_SRC_DIR}/.${basename}.patching" ]; then

        CT_DoLog ERROR "The '${basename}' sources were partially patched."

        CT_DoLog ERROR "Please remove first:"

        CT_DoLog ERROR " - the source dir for '${basename}', in '${CT_SRC_DIR}'"

        CT_DoLog ERROR " - the file '${CT_SRC_DIR}/.${basename}.extracted'"

        CT_DoLog ERROR " - the file '${CT_SRC_DIR}/.${basename}.patching'"

        CT_Abort "I'll stop now to avoid any carnage..."

    fi

    touch "${CT_SRC_DIR}/.${basename}.patching"

    [ "${nochdir}" = "nochdir" ] || CT_Pushd "${CT_SRC_DIR}/${basename}"

    CT_DoLog EXTRA "Patching '${basename}'"

    official_patch_dir=

    custom_patch_dir=

    [ "${CT_CUSTOM_PATCH_ONLY}" = "y" ] || official_patch_dir="${CT_LIB_DIR}/patches/${base_file}/${ver_file}"

    [ "${CT_CUSTOM_PATCH}" = "y" ] && custom_patch_dir="${CT_CUSTOM_PATCH_DIR}/${base_file}/${ver_file}"

    for patch_dir in "${official_patch_dir}" "${custom_patch_dir}"; do

        if [ -n "${patch_dir}" -a -d "${patch_dir}" ]; then

            for p in "${patch_dir}"/*.patch; do

                if [ -f "${p}" ]; then

                    CT_DoLog DEBUG "Applying patch '${p}'"

                    CT_DoExecLog ALL patch -g0 -F1 -p1 -f <"${p}"

                    CT_TestAndAbort "Failed while applying patch file '${p}'" ${PIPESTATUS[0]} -ne 0

                fi

            done

        fi

    done

    if [ "${CT_OVERIDE_CONFIG_GUESS_SUB}" = "y" ]; then

        CT_DoLog ALL "Overiding config.guess and config.sub"

        for cfg in config_guess config_sub; do

            eval ${cfg}="${CT_LIB_DIR}/scripts/${cfg/_/.}"

            [ -e "${CT_TOP_DIR}/scripts/${cfg/_/.}" ] && eval ${cfg}="${CT_TOP_DIR}/scripts/${cfg/_/.}"

            # Can't use CT_DoExecLog because of the '{} \;' to be passed un-mangled to find

            find . -type f -name "${cfg/_/.}" -exec cp -v "${!cfg}" {} \; |CT_DoLog ALL

        done

    fi

    CT_DoExecLog DEBUG rm -f "${CT_SRC_DIR}/.${basename}.patching"

    CT_DoExecLog DEBUG touch "${CT_SRC_DIR}/.${basename}.patched"

    [ "${nochdir}" = "nochdir" ] || CT_Popd

}

# Two wrappers to call config.(guess|sub) either from CT_TOP_DIR or CT_LIB_DIR.

# Those from CT_TOP_DIR, if they exist, will be be more recent than those from CT_LIB_DIR.

CT_DoConfigGuess() {

    if [ -x "${CT_TOP_DIR}/scripts/config.guess" ]; then

        "${CT_TOP_DIR}/scripts/config.guess"

    else

        "${CT_LIB_DIR}/scripts/config.guess"

    fi

}

CT_DoConfigSub() {

    if [ -x "${CT_TOP_DIR}/scripts/config.sub" ]; then

        "${CT_TOP_DIR}/scripts/config.sub" "$@"

    else

        "${CT_LIB_DIR}/scripts/config.sub" "$@"

    fi

}

# Compute the target tuple from what is provided by the user

# Usage: CT_DoBuildTargetTuple

# In fact this function takes the environment variables to build the target

# tuple. It is needed both by the normal build sequence, as well as the

# sample saving sequence.

CT_DoBuildTargetTuple() {

    # Set the endianness suffix, and the default endianness gcc option

    case "${CT_ARCH_BE},${CT_ARCH_LE}" in

        y,) target_endian_eb=eb

            target_endian_el=

            CT_ARCH_ENDIAN_CFLAG="-mbig-endian"

            CT_ARCH_ENDIAN_LDFLAG="-EB"

            ;;

        ,y) target_endian_eb=

            target_endian_el=el

            CT_ARCH_ENDIAN_CFLAG="-mlittle-endian"

            CT_ARCH_ENDIAN_LDFLAG="-EL"

            ;;

    esac

    # Build the default architecture tuple part

    CT_TARGET_ARCH="${CT_ARCH}"

    # Set defaults for the system part of the tuple. Can be overriden

    # by architecture-specific values.

    case "${CT_LIBC}" in

        none)   CT_TARGET_SYS=elf;;

        *glibc) CT_TARGET_SYS=gnu;;

        uClibc) CT_TARGET_SYS=uclibc;;

    esac

    # Transform the ARCH into a kernel-understandable ARCH

    CT_KERNEL_ARCH="${CT_ARCH}"

    # Set the default values for ARCH, ABI, CPU, TUNE, FPU and FLOAT

    unset CT_ARCH_ARCH_CFLAG CT_ARCH_ABI_CFLAG CT_ARCH_CPU_CFLAG CT_ARCH_TUNE_CFLAG CT_ARCH_FPU_CFLAG CT_ARCH_FLOAT_CFLAG

    unset CT_ARCH_WITH_ARCH CT_ARCH_WITH_ABI CT_ARCH_WITH_CPU CT_ARCH_WITH_TUNE CT_ARCH_WITH_FPU CT_ARCH_WITH_FLOAT

    [ "${CT_ARCH_ARCH}"     ] && { CT_ARCH_ARCH_CFLAG="-march=${CT_ARCH_ARCH}";  CT_ARCH_WITH_ARCH="--with-arch=${CT_ARCH_ARCH}"; }

    [ "${CT_ARCH_ABI}"      ] && { CT_ARCH_ABI_CFLAG="-mabi=${CT_ARCH_ABI}";     CT_ARCH_WITH_ABI="--with-abi=${CT_ARCH_ABI}";    }

    [ "${CT_ARCH_CPU}"      ] && { CT_ARCH_CPU_CFLAG="-mcpu=${CT_ARCH_CPU}";     CT_ARCH_WITH_CPU="--with-cpu=${CT_ARCH_CPU}";    }

    [ "${CT_ARCH_TUNE}"     ] && { CT_ARCH_TUNE_CFLAG="-mtune=${CT_ARCH_TUNE}";  CT_ARCH_WITH_TUNE="--with-tune=${CT_ARCH_TUNE}"; }

    [ "${CT_ARCH_FPU}"      ] && { CT_ARCH_FPU_CFLAG="-mfpu=${CT_ARCH_FPU}";     CT_ARCH_WITH_FPU="--with-fpu=${CT_ARCH_FPU}";    }

    [ "${CT_ARCH_FLOAT_SW}" ] && { CT_ARCH_FLOAT_CFLAG="-msoft-float";           CT_ARCH_WITH_FLOAT="--with-float=soft";          }

    # Build the default kernel tuple part

    CT_TARGET_KERNEL="${CT_KERNEL}"

    # Overide the default values with the components specific settings

    CT_DoArchTupleValues

    CT_DoKernelTupleValues

    # Finish the target tuple construction

    CT_TARGET="${CT_TARGET_ARCH}-${CT_TARGET_VENDOR:-unknown}-${CT_TARGET_KERNEL}${CT_TARGET_KERNEL:+-}${CT_TARGET_SYS}"

    # Sanity checks

    __sed_alias=""

    if [ -n "${CT_TARGET_ALIAS_SED_EXPR}" ]; then

        __sed_alias=$(echo "${CT_TARGET}" |sed -r -e "${CT_TARGET_ALIAS_SED_EXPR}")

    fi

    case ":${CT_TARGET_VENDOR}:${CT_TARGET_ALIAS}:${__sed_alias}:" in

      :*" "*:*:*:) CT_Abort "Don't use spaces in the vendor string, it breaks things.";;

      :*"-"*:*:*:) CT_Abort "Don't use dashes in the vendor string, it breaks things.";;

      :*:*" "*:*:) CT_Abort "Don't use spaces in the target alias, it breaks things.";;

      :*:*:*" "*:) CT_Abort "Don't use spaces in the target sed transform, it breaks things.";;

    esac

    # Canonicalise it

    CT_TARGET=$(CT_DoConfigSub "${CT_TARGET}")

    # Prepare the target CFLAGS

    CT_ARCH_TARGET_CFLAGS="${CT_ARCH_TARGET_CFLAGS} ${CT_ARCH_ENDIAN_CFLAG}"

    CT_ARCH_TARGET_CFLAGS="${CT_ARCH_TARGET_CFLAGS} ${CT_ARCH_ARCH_CFLAG}"

    CT_ARCH_TARGET_CFLAGS="${CT_ARCH_TARGET_CFLAGS} ${CT_ARCH_ABI_CFLAG}"

    CT_ARCH_TARGET_CFLAGS="${CT_ARCH_TARGET_CFLAGS} ${CT_ARCH_CPU_CFLAG}"

    CT_ARCH_TARGET_CFLAGS="${CT_ARCH_TARGET_CFLAGS} ${CT_ARCH_TUNE_CFLAG}"

    CT_ARCH_TARGET_CFLAGS="${CT_ARCH_TARGET_CFLAGS} ${CT_ARCH_FPU_CFLAG}"

    CT_ARCH_TARGET_CFLAGS="${CT_ARCH_TARGET_CFLAGS} ${CT_ARCH_FLOAT_CFLAG}"

    # Now on for the target LDFLAGS

    CT_ARCH_TARGET_LDFLAGS="${CT_ARCH_TARGET_LDFLAGS} ${CT_ARCH_ENDIAN_LDFLAG}"

}

# This function does pause the build until the user strikes "Return"

# Usage: CT_DoPause [optional_message]

CT_DoPause() {

    local foo

    local message="${1:-Pausing for your pleasure}"

    CT_DoLog INFO "${message}"

    read -p "Press 'Enter' to continue, or Ctrl-C to stop..." foo >&6

    return 0

}

# This function saves the state of the toolchain to be able to restart

# at any one point

# Usage: CT_DoSaveState <next_step_name>

CT_DoSaveState() {

	[ "${CT_DEBUG_CT_SAVE_STEPS}" = "y" ] || return 0

    local state_name="$1"

    local state_dir="${CT_STATE_DIR}/${state_name}"

    # Log this to the log level required by the user

    CT_DoLog ${CT_LOG_LEVEL_MAX} "Saving state to restart at step '${state_name}'..."

    rm -rf "${state_dir}"

    mkdir -p "${state_dir}"

    case "${CT_DEBUG_CT_SAVE_STEPS_GZIP}" in

        y)  tar_opt=z; tar_ext=.gz;;

        *)  tar_opt=;  tar_ext=;;

    esac

    CT_DoLog DEBUG "  Saving environment and aliases"

    # We must omit shell functions, and some specific bash variables

    # that break when restoring the environment, later. We could do

    # all the processing in the gawk script, but a sed is easier...

    set |"${awk}" '

              BEGIN { _p = 1; }

              $0~/^[^ ]+ \(\)/ { _p = 0; }

              _p == 1

              $0 == "}" { _p = 1; }

              ' |sed -r -e '/^BASH_(ARGC|ARGV|LINENO|SOURCE|VERSINFO)=/d;

                           /^(UID|EUID)=/d;

                           /^(FUNCNAME|GROUPS|PPID|SHELLOPTS)=/d;' >"${state_dir}/env.sh"

    CT_DoLog DEBUG "  Saving CT_CONFIG_DIR='${CT_CONFIG_DIR}'"

    CT_Pushd "${CT_CONFIG_DIR}"

    CT_DoExecLog DEBUG tar cv${tar_opt}f "${state_dir}/config_dir.tar${tar_ext}" .

    CT_Popd

    CT_DoLog DEBUG "  Saving CT_CC_CORE_STATIC_PREFIX_DIR='${CT_CC_CORE_STATIC_PREFIX_DIR}'"

    CT_Pushd "${CT_CC_CORE_STATIC_PREFIX_DIR}"

    CT_DoExecLog DEBUG tar cv${tar_opt}f "${state_dir}/cc_core_static_prefix_dir.tar${tar_ext}" .

    CT_Popd

    CT_DoLog DEBUG "  Saving CT_CC_CORE_SHARED_PREFIX_DIR='${CT_CC_CORE_SHARED_PREFIX_DIR}'"

    CT_Pushd "${CT_CC_CORE_SHARED_PREFIX_DIR}"

    CT_DoExecLog DEBUG tar cv${tar_opt}f "${state_dir}/cc_core_shared_prefix_dir.tar${tar_ext}" .

    CT_Popd

    CT_DoLog DEBUG "  Saving CT_PREFIX_DIR='${CT_PREFIX_DIR}'"

    CT_Pushd "${CT_PREFIX_DIR}"

    CT_DoExecLog DEBUG tar cv${tar_opt}f "${state_dir}/prefix_dir.tar${tar_ext}" --exclude '*.log' .

    CT_Popd

    if [ "${CT_LOG_TO_FILE}" = "y" ]; then

        CT_DoLog DEBUG "  Saving log file"

        exec >/dev/null

        case "${CT_DEBUG_CT_SAVE_STEPS_GZIP}" in

            y)  gzip -3 -c "${CT_LOG_FILE}"  >"${state_dir}/log.gz";;

            *)  cat "${CT_LOG_FILE}" >"${state_dir}/log";;

        esac

        exec >>"${CT_LOG_FILE}"

    fi

}

# This function restores a previously saved state

# Usage: CT_DoLoadState <state_name>

CT_DoLoadState(){

    local state_name="$1"

    local state_dir="${CT_STATE_DIR}/${state_name}"

    local old_RESTART="${CT_RESTART}"

    local old_STOP="${CT_STOP}"

    CT_TestOrAbort "The previous build did not reach the point where it could be restarted at '${CT_RESTART}'" -d "${state_dir}"

    # We need to do something special with the log file!

    if [ "${CT_LOG_TO_FILE}" = "y" ]; then

        exec >"${state_dir}/tail.log"

    fi

    # Log this to the log level required by the user

    CT_DoLog ${CT_LOG_LEVEL_MAX} "Restoring state at step '${state_name}', as requested."

    case "${CT_DEBUG_CT_SAVE_STEPS_GZIP}" in

        y)  tar_opt=z; tar_ext=.gz;;

        *)  tar_opt=;  tar_ext=;;

    esac

    CT_DoLog DEBUG "  Removing previous build directories"

    CT_DoForceRmdir             "${CT_PREFIX_DIR}" "${CT_CC_CORE_SHARED_PREFIX_DIR}" "${CT_CC_CORE_STATIC_PREFIX_DIR}" "${CT_CONFIG_DIR}"

    CT_DoExecLog DEBUG mkdir -p "${CT_PREFIX_DIR}" "${CT_CC_CORE_SHARED_PREFIX_DIR}" "${CT_CC_CORE_STATIC_PREFIX_DIR}" "${CT_CONFIG_DIR}"

    CT_DoLog DEBUG "  Restoring CT_PREFIX_DIR='${CT_PREFIX_DIR}'"

    CT_Pushd "${CT_PREFIX_DIR}"

    CT_DoExecLog DEBUG tar xv${tar_opt}f "${state_dir}/prefix_dir.tar${tar_ext}"

    CT_Popd

    CT_DoLog DEBUG "  Restoring CT_CC_CORE_SHARED_PREFIX_DIR='${CT_CC_CORE_SHARED_PREFIX_DIR}'"

    CT_Pushd "${CT_CC_CORE_SHARED_PREFIX_DIR}"

    CT_DoExecLog DEBUG tar xv${tar_opt}f "${state_dir}/cc_core_shared_prefix_dir.tar${tar_ext}"

    CT_Popd

    CT_DoLog DEBUG "  Restoring CT_CC_CORE_STATIC_PREFIX_DIR='${CT_CC_CORE_STATIC_PREFIX_DIR}'"

    CT_Pushd "${CT_CC_CORE_STATIC_PREFIX_DIR}"

    CT_DoExecLog DEBUG tar xv${tar_opt}f "${state_dir}/cc_core_static_prefix_dir.tar${tar_ext}"

    CT_Popd

    CT_DoLog DEBUG "  Restoring CT_CONFIG_DIR='${CT_CONFIG_DIR}'"

    CT_Pushd "${CT_CONFIG_DIR}"

    CT_DoExecLog DEBUG tar xv${tar_opt}f "${state_dir}/config_dir.tar${tar_ext}"

    CT_Popd

    # Restore the environment, discarding any error message

    # (for example, read-only bash internals)

    CT_DoLog DEBUG "  Restoring environment"

    . "${state_dir}/env.sh" >/dev/null 2>&1 || true

    # Restore the new RESTART and STOP steps

    CT_RESTART="${old_RESTART}"

    CT_STOP="${old_STOP}"

    unset old_stop old_restart

    if [ "${CT_LOG_TO_FILE}" = "y" ]; then

        CT_DoLog DEBUG "  Restoring log file"

        exec >/dev/null

        case "${CT_DEBUG_CT_SAVE_STEPS_GZIP}" in

            y)  zcat "${state_dir}/log.gz" >"${CT_LOG_FILE}";;

            *)  cat "${state_dir}/log" >"${CT_LOG_FILE}";;

        esac

        cat "${state_dir}/tail.log" >>"${CT_LOG_FILE}"

        exec >>"${CT_LOG_FILE}"

        rm -f "${state_dir}/tail.log"

    fi

}