# 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_ALL=4

 CT_LOG_LEVEL_DEBUG=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

         printf "${*}\n"

     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})"

 }

 # Remove entries referring to ., /tmp and non-existing directories from $PATH

 # Usage: CT_SanitizePath

 CT_SanitizePath() {

     local new

     local tmp

     local IFS=:

     for p in $PATH; do

         # Replace any occurence of . with $(pwd -P)

         # Use /tmp as a default if the directory is non-existent

         # Do not add /tmp in the PATH

         tmp="$( cd /tmp; cd "${p}" 2>/dev/null || true; pwd -P )"

         if [ "${tmp}" != "/tmp" ]; then

             new="${new}${new:+:}${p}"

         fi

     done

     PATH="${new}"

 }

 # 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

     CT_DoLog DEBUG "Testing '! ( $* )'"

     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

     CT_DoLog DEBUG "Testing '! ( $* )'"

     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

     CT_DoLog DEBUG "Testing '$*'"

     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

         case "$CT_SYS_OS" in

             Linux|CYGWIN*)

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

                 ;;

             Darwin|*BSD)

                 mode="$(stat -f '%Lp' "$(dirname "${dir}")")"

                 ;;

             *)

                 CT_Abort "Unhandled host OS $CT_SYS_OS"

                 ;;

         esac

         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

 }

 # Add the specified directory to LD_LIBRARY_PATH, and export it

 # If the specified patch is already present, just export

 # $1: path to add

 # $2: add as 'first' or 'last' path, 'first' is assumed if $2 is empty

 # Usage CT_SetLibPath /some/where/lib [first|last]

 CT_SetLibPath() {

     local path="$1"

     local pos="$2"

     case ":${LD_LIBRARY_PATH}:" in

         *:"${path}":*)  ;;

         *)  case "${pos}" in

                 last)

                     CT_DoLog DEBUG "Adding '${path}' at end of LD_LIBRARY_PATH"

                     LD_LIBRARY_PATH="${LD_LIBRARY_PATH:+${LD_LIBRARY_PATH}:}${path}"

                     ;;

                 first|"")

                     CT_DoLog DEBUG "Adding '${path}' at start of LD_LIBRARY_PATH"

                     LD_LIBRARY_PATH="${path}${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}"

                     ;;

                 *)

                     CT_Abort "Incorrect position '${pos}' to add '${path}' to LD_LIBRARY_PATH"

                     ;;

             esac

             ;;

     esac

     CT_DoLog DEBUG "==> LD_LIBRARY_PATH='${LD_LIBRARY_PATH}'"

     export LD_LIBRARY_PATH

 }

 # Get the file name extension of a component

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

 # If found, echoes the extension to stdout, and return 0

 # If not found, echoes nothing on stdout, and return !0.

 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 /.git ''; do

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

             echo "${ext}"

             exit 0

         fi

     done

     exit 1

 }

 # 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} -L -f  \

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

     || true

 }

 # Download using aria2

 # Usage: CT_DoGetFileAria2 <URL>

 CT_DoGetFileAria2() {

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

     # Plus: default progress indicator is a single line, so use verbose log

     #       so that the CT-NG's ouput is 'live'.

     CT_DoExecLog ALL aria2c --summary-interval=1 -s ${CT_DOWNLOAD_MAX_CHUNKS} -m 3 -t ${CT_CONNECT_TIMEOUT} -p "$1" \

     || CT_DoExecLog ALL aria2c --summary-interval=1 -s ${CT_DOWNLOAD_MAX_CHUNKS} -m 3 -t ${CT_CONNECT_TIMEOUT} "$1" \

     || rm -f "${1##*/}"

 }

 # OK, just look if we have them...

 _aria2c=$(CT_Which aria2c)

 _wget=$(CT_Which wget)

 _curl=$(CT_Which curl)

 # Wrapper function to call one of, in order of preference:

 #   aria2

 #   curl

 #   wget

 # Usage: CT_DoGetFile <URL>

 CT_DoGetFile() {

     if   [ -n "${_aria2c}" ]; then

         CT_DoGetFileAria2 "$1"

     elif [ -n "${_curl}" ]; then

         CT_DoGetFileCurl "$1"

     elif [ -n "${_wget}" ]; then

         CT_DoGetFileWget "$1"

     else

         CT_Abort "Could find neither wget nor curl"

     fi

 }

 # 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?

     if ext="$( CT_GetFileExtension "${basename}" ${first_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...

     # 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 mirror base URL" -n "${CT_MIRROR_BASE_URL}"

         LAN_URLS="${LAN_URLS} ${CT_MIRROR_BASE_URL}/${file%-*}"

         LAN_URLS="${LAN_URLS} ${CT_MIRROR_BASE_URL}"

         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

     # Do *not* try git trees (ext=/.git), this is handled in a specific

     # wrapper, below

     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[=subdir]]

 # Note: if '=subdir' is given, then it is used instead of 'module'.

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

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

         case "${dirname}" in

             *=*)

                 CT_DoExecLog DEBUG mv "${dirname#*=}" "${dirname%%=*}"

                 CT_DoExecLog ALL tar cjf "${CT_TARBALLS_DIR}/${basename}.tar.bz2" "${dirname%%=*}"

                 ;;

             *)

                 CT_DoExecLog ALL mv "${module}" "${dirname}"

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

                 ;;

         esac

     fi

     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...

     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}"

 }

 # Clone a git tree

 # Tries the given URLs in turn until one can get cloned. No tarball will be created.

 # Prerequisites: either the server does not require password,

 # or the user has already taken any action to authenticate to the server.

 # The cloned tree will *not* be stored in the local tarballs dir!

 # Usage: CT_GetGit <basename> <url [url ...]>

 CT_GetGit() {

     local basename="$1"; shift

     local url

     local cloned=0

     # Do we have it in our tarballs dir?

     if [ -d "${CT_TARBALLS_DIR}/${basename}/.git" ]; then

         CT_DoLog EXTRA "Updating git tree '${basename}'"

         CT_Pushd "${CT_TARBALLS_DIR}/${basename}"

         CT_DoExecLog ALL git pull

         CT_Popd

     else

         CT_DoLog EXTRA "Retrieving git tree '${basename}'"

         for url in "${@}"; do

             CT_DoLog ALL "Trying to clone from '${url}'"

             CT_DoForceRmdir "${CT_TARBALLS_DIR}/${basename}"

             if git clone "${url}" "${CT_TARBALLS_DIR}/${basename}" 2>&1 |CT_DoLog ALL; then

                 cloned=1

                 break

             fi

         done

         CT_TestOrAbort "Could not clone '${basename}'" ${cloned} -ne 0

     fi

 }

 # 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'.

 # Note also that this function handles the git trees!

 # Usage: CT_Extract <basename> [nochdir] [options]

 # where 'options' are dependent on the source (eg. git branch/tag...)

 CT_Extract() {

     local nochdir="$1"

     local basename

     local ext

     if [ "${nochdir}" = "nochdir" ]; then

         shift

         nochdir="$(pwd)"

     else

         nochdir="${CT_SRC_DIR}"

     fi

     basename="$1"

     shift

     if ! ext="$(CT_GetFileExtension "${basename}")"; then

       CT_Abort "'${basename}' not found in '${CT_TARBALLS_DIR}'"

     fi

     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

     # Check if previously partially extracted

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

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

         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}.extracting'"

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

     fi

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

     CT_Pushd "${nochdir}"

     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}";;

         /.git)        CT_ExtractGit "${basename}" "${@}";;

         *)            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}"

     # Don't mark as being extracted for git

     case "${ext}" in

         /.git)  ;;

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

     esac

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

     CT_Popd

 }

 # Create a working git clone

 # Usage: CT_ExtractGit <basename> [ref]

 # where 'ref' is the reference to use:

 #   the full name of a branch, like "remotes/origin/branch_name"

 #   a date as understandable by git, like "YYYY-MM-DD[ hh[:mm[:ss]]]"

 #   a tag name

 CT_ExtractGit() {

     local basename="${1}"

     local ref="${2}"

     local clone_dir

     local ref_type

     # pushd now to be able to get git revlist in case ref is a date

     clone_dir="${CT_TARBALLS_DIR}/${basename}"

     CT_Pushd "${clone_dir}"

     # What kind of reference is ${ref} ?

     if [ -z "${ref}" ]; then

         # Don't update the clone, keep as-is

         ref_type=none

     elif git tag |grep -E "^${ref}$" >/dev/null 2>&1; then

         ref_type=tag

     elif git branch -a --no-color |grep -E "^. ${ref}$" >/dev/null 2>&1; then

         ref_type=branch

     elif date -d "${ref}" >/dev/null 2>&1; then

         ref_type=date

         ref=$(git rev-list -n1 --before="${ref}")

     else

         CT_Abort "Reference '${ref}' is an incorrect git reference: neither tag, branch nor date"

     fi

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

     CT_DoExecLog ALL ln -sf "${clone_dir}" "${CT_SRC_DIR}/${basename}"

     case "${ref_type}" in

         none)   ;;

         *)      CT_DoExecLog ALL git checkout "${ref}";;

     esac

     CT_Popd

 }

 # Patches the specified component

 # See CT_Extract, above, for explanations on 'nochdir'

 # Usage: CT_Patch [nochdir] <packagename> <packageversion>

 # If the package directory is *not* packagename-packageversion, then

 # the caller must cd into the proper directory first, and call us

 # with nochdir

 CT_Patch() {

     local nochdir="$1"

     local pkgname

     local version

     local pkgdir

     local base_file

     local ver_file

     local d

     local -a patch_dirs

     local bundled_patch_dir

     local local_patch_dir

     if [ "${nochdir}" = "nochdir" ]; then

         shift

         pkgname="$1"

         version="$2"

         pkgdir="${pkgname}-${version}"

         nochdir="$(pwd)"

     else

         pkgname="$1"

         version="$2"

         pkgdir="${pkgname}-${version}"

         nochdir="${CT_SRC_DIR}/${pkgdir}"

     fi

     # Check if already patched

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

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

         return 0

     fi

     # Check if already partially patched

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

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

         CT_DoLog ERROR "Please remove first:"

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

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

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

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

     fi

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

     CT_Pushd "${nochdir}"

     CT_DoLog EXTRA "Patching '${pkgdir}'"

     bundled_patch_dir="${CT_LIB_DIR}/patches/${pkgname}/${version}"

     local_patch_dir="${CT_LOCAL_PATCH_DIR}/${pkgname}/${version}"

     case "${CT_PATCH_ORDER}" in

         bundled)        patch_dirs=("${bundled_patch_dir}");;

         local)          patch_dirs=("${local_patch_dir}");;

         bundled,local)  patch_dirs=("${bundled_patch_dir}" "${local_patch_dir}");;

         local,bundled)  patch_dirs=("${local_patch_dir}" "${bundled_patch_dir}");;

         none)           patch_dirs=;;

     esac

     for d in "${patch_dirs[@]}"; do

         CT_DoLog DEBUG "Looking for patches in '${d}'..."

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

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

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

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

                     CT_DoExecLog ALL patch --no-backup-if-mismatch -g0 -F1 -p1 -f <"${p}"

                 fi

             done

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

                 break

             fi

         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 touch "${CT_SRC_DIR}/.${pkgdir}.patched"

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

     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

         *glibc) CT_TARGET_SYS=gnu;;

         uClibc) CT_TARGET_SYS=uclibc;;

         *)      CT_TARGET_SYS=elf;;

     esac

     # 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="${CT_TARGET}${CT_TARGET_VENDOR:+-${CT_TARGET_VENDOR}}"

     CT_TARGET="${CT_TARGET}${CT_TARGET_KERNEL:+-${CT_TARGET_KERNEL}}"

     CT_TARGET="${CT_TARGET}${CT_TARGET_SYS:+-${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 creates a tarball of the specified directory, but

 # only if it exists

 # Usage: CT_DoTarballIfExists <dir> <tarball_basename> [extra_tar_options [...]]

 CT_DoTarballIfExists() {

     local dir="$1"

     local tarball="$2"

     shift 2

     local -a extra_tar_opts=( "$@" )

     local -a compress

     case "${CT_DEBUG_CT_SAVE_STEPS_GZIP}" in

         y)  compress=( gzip -c -3 - ); tar_ext=.gz;;

         *)  compress=( cat - );        tar_ext=;;

     esac

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

         CT_DoLog DEBUG "  Saving '${dir}'"

         { tar c -C "${dir}" -v -f - "${extra_tar_opts[@]}" .    \

           |"${compress[@]}" >"${tarball}.tar${tar_ext}"         ;

         } 2>&1 |sed -r -e 's/^/    /;' |CT_DoLog DEBUG

     else

         CT_DoLog DEBUG "  Not saving '${dir}': does not exist"

     fi

 }

 # This function extracts a tarball to the specified directory, but

 # only if the tarball exists

 # Usage: CT_DoTarballIfExists <tarball_basename> <dir> [extra_tar_options [...]]

 CT_DoExtractTarballIfExists() {

     local tarball="$1"

     local dir="$2"

     shift 2

     local -a extra_tar_opts=( "$@" )

     local -a uncompress

     case "${CT_DEBUG_CT_SAVE_STEPS_GZIP}" in

         y)  uncompress=( gzip -c -d ); tar_ext=.gz;;

         *)  uncompress=( cat );        tar_ext=;;

     esac

     if [ -f "${tarball}.tar${tar_ext}" ]; then

         CT_DoLog DEBUG "  Restoring '${dir}'"

         CT_DoForceRmdir "${dir}"

         CT_DoExecLog DEBUG mkdir -p "${dir}"

         { "${uncompress[@]}" "${tarball}.tar${tar_ext}"     \

           |tar x -C "${dir}" -v -f - "${extra_tar_opts[@]}" ;

         } 2>&1 |sed -r -e 's/^/    /;' |CT_DoLog DEBUG

     else

         CT_DoLog DEBUG "  Not restoring '${dir}': does not exist"

     fi

 }

 # 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}"

     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 awk 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"

     if [ "${CT_COMPLIBS_SHARED}" != "y" ]; then

         # If complibs are not shared, then COMPLIBS_DIR == PREFIX_DIR,

         # so do not save.

         CT_DoTarballIfExists "${CT_COMPLIBS_DIR}" "${state_dir}/complibs_dir"

     fi

     CT_DoTarballIfExists "${CT_CONFIG_DIR}" "${state_dir}/config_dir"

     CT_DoTarballIfExists "${CT_CC_CORE_STATIC_PREFIX_DIR}" "${state_dir}/cc_core_static_prefix_dir"

     CT_DoTarballIfExists "${CT_CC_CORE_SHARED_PREFIX_DIR}" "${state_dir}/cc_core_shared_prefix_dir"

     CT_DoTarballIfExists "${CT_PREFIX_DIR}" "${state_dir}/prefix_dir" --exclude '*.log'

     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."

     CT_DoExtractTarballIfExists "${state_dir}/prefix_dir" "${CT_PREFIX_DIR}"

     CT_DoExtractTarballIfExists "${state_dir}/cc_core_shared_prefix_dir" "${CT_CC_CORE_SHARED_PREFIX_DIR}"

     CT_DoExtractTarballIfExists "${state_dir}/cc_core_static_prefix_dir" "${CT_CC_CORE_STATIC_PREFIX_DIR}"

     CT_DoExtractTarballIfExists "${state_dir}/config_dir" "${CT_CONFIG_DIR}"

     if [ "${CT_COMPLIBS_SHARED}" != "y" ]; then

         # If complibs are not shared, then COMPLIBS_DIR == PREFIX_DIR,

         # so do not restore.

         CT_DoExtractTarballIfExists "${state_dir}/complibs_dir" "${CT_COMPLIBS_DIR}"

     fi

     # 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

 }