# 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=$?

    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

# 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 "${1}"

    fi |( IFS="\n" # We want the full lines, even leading spaces

          CT_PROG_BAR_CPT=0

          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["?*"]:"*"Stop.") cur_L=ERROR; cur_l=${CT_LOG_LEVEL_ERROR};;

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

              esac

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

              # There will always be a log file, be it /dev/null

              echo -e "${l}"

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

                  echo -e "\r${l}" >&6

              fi

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

                  [ ${CT_PROG_BAR_CPT} -eq 0  ] && bar="/"

                  [ ${CT_PROG_BAR_CPT} -eq 10 ] && bar="-"

                  [ ${CT_PROG_BAR_CPT} -eq 20 ] && bar="\\"

                  [ ${CT_PROG_BAR_CPT} -eq 30 ] && bar="|"

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

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

              fi

          done

        )

    return 0

}

# 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`

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

    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 (Mdk are such

# suckers...)

# 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 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"

    return 0

}

# Pushes into a directory, and pops back

CT_Pushd() {

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

}

CT_Popd() {

    popd >/dev/null 2>&1

}

# Makes a path absolute

# Usage: CT_MakeAbsolutePath path

CT_MakeAbsolutePath() {

    # Try to cd in that directory

    if [ -d "$1" ]; then

        CT_Pushd "$1"

        pwd

        CT_Popd

    else

        # No such directory, fail back to guessing

        case "$1" in

            /*)  echo "$1";;

            *)   echo "`pwd`/$1";;

        esac

    fi

    return 0

}

# 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}/.XXXXXX\"`"

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

}

# 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>

# If found, echoes the extension to stdout

# If not found, echoes nothing on stdout.

CT_GetFileExtension() {

    local ext

    local file="$1"

    CT_Pushd "${CT_TARBALLS_DIR}"

    # 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 .tar.gz .tar.bz2 .tgz .tar ''; do

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

            echo "${ext}"

            break

        fi

    done

    CT_Popd

    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 proxies to connect to to the internet, but

    # it's not easy to detect them, and wget may never timeout while connecting,

    # so force a global 120s timeout.

    wget -T 120 -nc --progress=dot:binary --tries=3 --passive-ftp "$1"  \

    || wget -T 120 -nc --progress=dot:binary --tries=3 "$1"             \

    || true

}

# Download an URL using curl

# Usage: CT_DoGetFileCurl <URL>

CT_DoGetFileCurl() {

    # Note: comments about wget method are also valid here

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

    #       so output is consigned to oblivion

    curl --ftp-pasv -O --retry 3 "$1" --connect-timeout 120 >/dev/null  \

    || curl -O --retry 3 "$1" --connect-timeout 120 >/dev/null          \

    || 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_DoError "Could find neither wget nor curl";;

        ,*) CT_DoGetFileCurl "$1" 2>&1 |CT_DoLog ALL;;

        *)  CT_DoGetFileWget "$1" 2>&1 |CT_DoLog ALL;;

    esac

}

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

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

CT_GetFile() {

    local ext

    local url

    local file="$1"

    local first_ext=""

    shift

    case "$1" in

        .tar.bz2|.tar.gz|.tgz|.tar)

            first_ext="$1"

            shift

            ;;

    esac

    # Do we already have it?

    ext=`CT_GetFileExtension "${file}"`

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

        CT_DoLog DEBUG "Already have \"${file}\""

        return 0

    fi

    CT_Pushd "${CT_TARBALLS_DIR}"

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

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

    # Try local copy first, if it exists

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

        CT_DoLog DEBUG "Trying \"${CT_LOCAL_TARBALLS_DIR}/${file}${ext}\""

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

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

            CT_DoLog EXTRA "Using \"${file}\" from local storage"

            ln -sv "${CT_LOCAL_TARBALLS_DIR}/${file}${ext}" "${file}${ext}" |CT_DoLog ALL

            return 0

        fi

    done

    # Try to download it

    CT_DoLog EXTRA "Retrieving \"${file}\" from network"

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

        # Try all urls in turn

        for url in "$@"; do

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

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

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

                # No need to test if the file already exists because

                # it does NOT. If it did exist, we'd have been stopped

                # above, when looking for local copies.

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

                    CT_DoLog EXTRA "Saving \"${file}\" to local storage"

                    mv "${file}${ext}" "${CT_LOCAL_TARBALLS_DIR}" |CT_DoLog ALL

                    ln -sv "${CT_LOCAL_TARBALLS_DIR}/${file}${ext}" "${file}${ext}" |CT_DoLog ALL

                fi

                return 0

            fi

        done

    done

    CT_Popd

    CT_Abort "Could not download \"${file}\", and not present in \"${CT_LOCAL_TARBALLS_DIR}\""

}

# Extract a tarball and patch the resulting sources if necessary.

# 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.

CT_ExtractAndPatch() {

    local file="$1"

    local base_file=`echo "${file}" |cut -d - -f 1`

    local ver_file=`echo "${file}" |cut -d - -f 2-`

    local official_patch_dir

    local custom_patch_dir

    local libc_addon

    local ext=`CT_GetFileExtension "${file}"`

    CT_TestAndAbort "\"${file}\" not found in \"${CT_TARBALLS_DIR}\"" -z "${ext}"

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

    CT_Pushd "${CT_SRC_DIR}"

    # Add-ons need a little love, really.

    case "${file}" in

        glibc-[a-z]*-*)

            CT_TestAndAbort "Trying to extract the C-library addon/locales \"${file}\" when C-library not yet extracted" ! -d "${CT_LIBC_FILE}"

            cd "${CT_LIBC_FILE}"

            libc_addon=y

            [ -f ".${file}.extracted" ] && return 0

            touch ".${file}.extracted"

            ;;

        uClibc-locale-*)

            CT_TestAndAbort "Trying to extract the C-library addon/locales \"${file}\" when C-library not yet extracted" ! -d "${CT_LIBC_FILE}"

            cd "${CT_LIBC_FILE}/extra/locale"

            libc_addon=y

            [ -f ".${file}.extracted" ] && return 0

            touch ".${file}.extracted"

            ;;

    esac

    # If the directory exists, then consider extraction and patching done

    if [ -d "${file}" ]; then

        CT_DoLog DEBUG "Already extracted \"${file}\""

        return 0

    fi

    CT_DoLog EXTRA "Extracting \"${file}\""

    case "${ext}" in

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

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

        .tar)         tar xvf  "${full_file}" |CT_DoLog ALL;;

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

    esac

    # Snapshots might not have the version number in the extracted directory

    # name. This is also the case for some (odd) packages, such as D.U.M.A.

    # Overcome this issue by symlink'ing the directory.

    if [ ! -d "${file}" -a "${libc_addon}" != "y" ]; then

        case "${ext}" in

            .tar.bz2)     base=`tar tjf "${full_file}" |head -n 1 |cut -d / -f 1 || true`;;

            .tar.gz|.tgz) base=`tar tzf "${full_file}" |head -n 1 |cut -d / -f 1 || true`;;

            .tar)         base=`tar tf  "${full_file}" |head -n 1 |cut -d / -f 1 || true`;;

        esac

        CT_TestOrAbort "There was a problem when extracting \"${file}\"" -d "${base}" -o "${base}" != "${file}"

        ln -s "${base}" "${file}"

    fi

    # Kludge: outside this function, we wouldn't know if we had just extracted

    # a libc addon, or a plain package. Apply patches now.

    CT_DoLog EXTRA "Patching \"${file}\""

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

        # Some addons tarball directly contian the correct addon directory,

        # while others have the addon directory named ofter the tarball.

        # Fix that by always using the short name (eg: linuxthreads, ports, etc...)

        addon_short_name=`echo "${file}" |sed -r -e 's/^[^-]+-//; s/-[^-]+$//;'`

        [ -d "${addon_short_name}" ] || ln -s "${file}" "${addon_short_name}"

        # If libc addon, we're already in the correct place

    else

        cd "${file}"

    fi

    official_patch_dir=

    custom_patch_dir=

    [ "${CUSTOM_PATCH_ONLY}" = "y" ] || official_patch_dir="${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}\""

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

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

                fi

            done

        fi

    done

    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}/tools/config.guess" ]; then

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

    else

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

    fi

}

CT_DoConfigSub() {

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

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

    else

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

    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"

            ;;

        ,y) target_endian_eb=

            target_endian_el=el

            CT_ARCH_ENDIAN_CFLAG="-mlittle-endian"

            ;;

    esac

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

    # by architecture-specific values.

    case "${CT_LIBC}" in

        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

    unset CT_ARCH_WITH_ARCH CT_ARCH_WITH_ABI CT_ARCH_WITH_CPU CT_ARCH_WITH_TUNE CT_ARCH_WITH_FPU

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

    # Call the architecture specific settings

    CT_DoArchValues

    # Finish the target tuple construction

    case "${CT_KERNEL}" in

        linux*)  CT_TARGET_KERNEL=linux;;

    esac

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

    # Prepare the 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}"

}

# 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}"

    CT_DoLog DEBUG "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

    set |awk '

         BEGIN { _p = 1; }

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

         _p == 1

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

         ' >"${state_dir}/env.sh"

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

    CT_Pushd "${CT_CC_CORE_STATIC_PREFIX_DIR}"

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

    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}"

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

    CT_Popd

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

    CT_Pushd "${CT_PREFIX_DIR}"

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

    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

    CT_DoLog INFO "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"

    chmod -R u+rwX "${CT_PREFIX_DIR}" "${CT_CC_CORE_SHARED_PREFIX_DIR}" "${CT_CC_CORE_STATIC_PREFIX_DIR}"

    rm -rf         "${CT_PREFIX_DIR}" "${CT_CC_CORE_SHARED_PREFIX_DIR}" "${CT_CC_CORE_STATIC_PREFIX_DIR}"

    mkdir -p       "${CT_PREFIX_DIR}" "${CT_CC_CORE_SHARED_PREFIX_DIR}" "${CT_CC_CORE_STATIC_PREFIX_DIR}"

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

    CT_Pushd "${CT_PREFIX_DIR}"

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

    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}"

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

    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}"

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

    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

}