# This file contains some usefull common functions -*- sh -*-

# 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

    [ "${CT_LOG_TO_FILE}" = "y" ] && CT_DoLog ERROR "Look at '${tmp_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

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

rm -f "${tmp_log_file}"

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_CFG=4

CT_LOG_LEVEL_FILE=5

CT_LOG_LEVEL_STATE=6

CT_LOG_LEVEL_ALL=7

CT_LOG_LEVEL_DEBUG=8

# 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

#   - CFG:     Output of various "./configure"-type scripts

#   - FILE:    File / archive unpacking.

#   - STATE:   State save & restore

#   - ALL:     Component's build messages

#   - DEBUG:   Internal debug 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 "%s\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

# It is possible to even log local variable assignments (a-la: var=val ./cmd opts)

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

CT_DoExecLog() {

    local level="$1"

    shift

    (

    for i in "$@"; do

        tmp_log+="'${i}' "

    done

    while true; do

        case "${1}" in

            *=*)    eval export "'${1}'"; shift;;

            *)      break;;

        esac

    done

    CT_DoLog DEBUG "==> Executing: ${tmp_log}"

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

    )

    # Catch failure of the sub-shell

    [ $? -eq 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)

    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 . and other relative paths

# Usage: CT_SanitizePath

CT_SanitizePath() {

    local new

    local p

    local IFS=:

    for p in $PATH; do

        # Only accept absolute paths;

        # Note: as a special case the empty string in PATH is equivalent to .

        if [ -n "${p}" -a -z "${p%%/*}" ]; then

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

        fi

    done

    PATH="${new}"

}

# Sanitise the directory name contained in the variable passed as argument:

# - remove duplicate /

# Usage: CT_SanitiseVarDir CT_PREFIX_DIR

CT_SanitiseVarDir() {

    local var

    local old_dir

    local new_dir

    for var in "$@"; do

        eval "old_dir=\"\${${var}}\""

        new_dir="$( printf "${old_dir}"     \

                    |sed -r -e 's:/+:/:g;'  \

                  )"

        eval "${var}=\"${new_dir}\""

        CT_DoLog DEBUG "Sanitised '${var}': '${old_dir}' -> '${new_dir}'"

    done

}

# 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

}

# Try to retrieve the specified URL (HTTP or FTP)

# Usage: CT_DoGetFile <URL>

# This functions always returns true (0), as it can be legitimate not

# to find the requested URL (think about snapshots, different layouts

# for different gcc versions, etc...).

CT_DoGetFile() {

    local dest="${1##*/}"

    local tmp="${dest}.tmp-dl"

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

    # We are sure at least one is available, ./configure checked for it.

    local _curl=$(CT_Which curl)

    local _wget=$(CT_Which wget)

    _curl="${_curl:-false}"

    _wget="${_wget:-false}"

    # Remove potential left-over from a previous run

    rm -f "${tmp}"

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

    # retry without.

    # We also retry a few times, in case there is a transient error (eg. behind

    # a dynamic IP that changes during the transfer...)

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

    # For curl, no good progress indicator is available. So, be silent.

    if CT_DoExecLog ALL "${_curl}" --ftp-pasv    --retry 3 --connect-timeout ${CT_CONNECT_TIMEOUT} -L -f -s -o "${tmp}"   "$1"  \

    || CT_DoExecLog ALL "${_curl}"               --retry 3 --connect-timeout ${CT_CONNECT_TIMEOUT} -L -f -s -o "${tmp}"   "$1"  \

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

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

    ; then

        # One of them succeeded, good!

        mv "${tmp}" "${dest}"

    else

        # Woops...

        rm -f "${tmp}"

    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 FILE tar xvjf "${full_file}";;

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

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

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

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

    esac

    # 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 FILE 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 STATE

    else

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

    fi

}

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

# only if the tarball exists

# Usage: CT_DoExtractTarballIfExists <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