# 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: CT_DoExecLog <level> <[VAR=val...] 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 (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 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

 }

 # 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

 }

 # Set environment for proxy access

 # Usage: CT_DoSetProxy <proxy_type>

 # where proxy_type is one of 'http', 'sockssys', 'socks4' or 'socks5',

 # or empty (to not change proxy settings).

 CT_DoSetProxy() {

     case "${1}" in

         http)

             http_proxy="http://"

             case  "${CT_PROXY_USER}:${CT_PROXY_PASS}" in

                 :)      ;;

                 :*)     http_proxy="${http_proxy}:${CT_PROXY_PASS}@";;

                 *:)     http_proxy="${http_proxy}${CT_PROXY_USER}@";;

                 *:*)    http_proxy="${http_proxy}${CT_PROXY_USER}:${CT_PROXY_PASS}@";;

             esac

             export http_proxy="${http_proxy}${CT_PROXY_HOST}:${CT_PROXY_PORT}/"

             export https_proxy="${http_proxy}"

             export ftp_proxy="${http_proxy}"

             CT_DoLog DEBUG "http_proxy='${http_proxy}'"

             ;;

         sockssys)

             CT_HasOrAbort tsocks

             . tsocks -on

             ;;

         socks*)

             # Remove any lingering config file from any previous run

             rm -f "${CT_BUILD_DIR}/tsocks.conf"

             # Find all interfaces and build locally accessible networks

             server_ip=$(ping -c 1 -W 2 "${CT_PROXY_HOST}" |head -n 1 |sed -r -e 's/^[^\(]+\(([^\)]+)\).*$/\1/;' || true)

             CT_TestOrAbort "SOCKS proxy '${CT_PROXY_HOST}' has no IP." -n "${server_ip}"

             /sbin/ifconfig |gawk -v server_ip="${server_ip}" '

                 BEGIN {

                     split( server_ip, tmp, "\\." );

                     server_ip_num = tmp[1] * 2^24 + tmp[2] * 2^16 + tmp[3] * 2^8 + tmp[4] * 2^0;

                     pairs = 0;

                 }

                 $0 ~ /^[[:space:]]*inet addr:/ {

                     split( $2, tmp, ":|\\." );

                     if( ( tmp[2] == 127 ) && ( tmp[3] == 0 ) && ( tmp[4] == 0 ) && ( tmp[5] == 1 ) ) {

                         /* Skip 127.0.0.1, it'\''s taken care of by tsocks itself */

                         next;

                     }

                     ip_num = tmp[2] * 2^24 + tmp[3] * 2^16 + tmp[4] * 2 ^8 + tmp[5] * 2^0;

                     i = 32;

                     do {

                         i--;

                         mask = 2^32 - 2^i;

                     } while( (i!=0) && ( and( server_ip_num, mask ) == and( ip_num, mask ) ) );

                     mask = and( 0xFFFFFFFF, lshift( mask, 1 ) );

                     if( (i!=0) && (mask!=0) ) {

                         masked_ip = and( ip_num, mask );

                         for( i=0; i<pairs; i++ ) {

                             if( ( masked_ip == ips[i] ) && ( mask == masks[i] ) ) {

                                 next;

                             }

                         }

                         ips[pairs] = masked_ip;

                         masks[pairs] = mask;

                         pairs++;

                         printf( "local = %d.%d.%d.%d/%d.%d.%d.%d\n",

                                 and( 0xFF, masked_ip / 2^24 ),

                                 and( 0xFF, masked_ip / 2^16 ),

                                 and( 0xFF, masked_ip / 2^8 ),

                                 and( 0xFF, masked_ip / 2^0 ),

                                 and( 0xFF, mask / 2^24 ),

                                 and( 0xFF, mask / 2^16 ),

                                 and( 0xFF, mask / 2^8 ),

                                 and( 0xFF, mask / 2^0 ) );

                     }

                 }

             ' >"${CT_BUILD_DIR}/tsocks.conf"

             ( echo "server = ${server_ip}";

               echo "server_port = ${CT_PROXY_PORT}";

               [ -n "${CT_PROXY_USER}"   ] && echo "default_user=${CT_PROXY_USER}";

               [ -n "${CT_PROXY_PASS}" ] && echo "default_pass=${CT_PROXY_PASS}";

             ) >>"${CT_BUILD_DIR}/tsocks.conf"

             case "${CT_PROXY_TYPE/socks}" in

                 4|5) proxy_type="${CT_PROXY_TYPE/socks}";;

                 auto)

                     reply=$(inspectsocks "${server_ip}" "${CT_PROXY_PORT}" 2>&1 || true)

                     case "${reply}" in

                         *"server is a version 4 socks server") proxy_type=4;;

                         *"server is a version 5 socks server") proxy_type=5;;

                         *) CT_Abort "Unable to determine SOCKS proxy type for '${CT_PROXY_HOST}:${CT_PROXY_PORT}'"

                     esac

                     ;;

             esac

             echo "server_type = ${proxy_type}" >> "${CT_BUILD_DIR}/tsocks.conf"

             CT_HasOrAbort tsocks

             # If tsocks was found, then validateconf is present (distributed with tsocks).

             CT_DoExecLog DEBUG validateconf -f "${CT_BUILD_DIR}/tsocks.conf"

             export TSOCKS_CONF_FILE="${CT_BUILD_DIR}/tsocks.conf"

             . tsocks -on

             ;;

     esac

 }

 # 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.

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

     || 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 output is consigned to oblivion

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

     || curl -O --retry 3 "$1" --connect-timeout ${CT_CONNECT_TIMEOUT} >/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_Abort "Could find neither wget nor curl";;

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

         *)  CT_DoExecLog ALL CT_DoGetFileWget "$1" 2>&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.

         # Try local copy first, if it exists

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

             CT_DoLog DEBUG "Trying '${CT_LOCAL_TARBALLS_DIR}/${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 '${file}' 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

     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...

     # Try to retrieve the file

     CT_DoLog EXTRA "Retrieving '${file}'"

     CT_Pushd "${CT_TARBALLS_DIR}"

     # Add URLs on the LAN mirror

     LAN_URLS=

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

         CT_DoLog DEBUG "Trying to retrieve a copy of '${file}' from LAN mirror '${CT_MIRROR_HOSTNAME}'"

         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}"

     fi

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

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

     else

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

     fi

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

     CT_DoSetProxy ${CT_PROXY_TYPE}

     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...

     CT_DoLog EXTRA "Retrieving '${basename}'"

     CT_MktempDir tmp_dir

     CT_Pushd "${tmp_dir}"

     CT_DoSetProxy ${CT_PROXY_TYPE}

     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}"

 }

 # 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

     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

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

     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}"

     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, 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 |gawk '

               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_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

     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}"

     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

     # 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

 }