#!/bin/bash

# This script will populate the root directory with libs from the sysroot.

# (C) 2007 Yann E. MORIN

# Licensed under the GPL v2

# Detect where the toolchain is:

BIN_DIR="$(cd "$(dirname "$0")"; pwd)"

CT_READELF="${BIN_DIR}/@@CT_TARGET@@-readelf"

CT_SYSROOT_DIR="${BIN_DIR}/../@@CT_TARGET@@/sys-root"

myname=$(basename "$0")

doHelp() {

    cat <<_EOF_

NAME

    $myname - populate the target root file system

SYNOPSIS

    $myname OPTIONS -s source_root -d destination_root

DESCRIPTION

    $myname will 'populate' your target root file system ('src_dir') with

    libraries from the toolchain (eg. libc.so...), storing the result into

    'dst_dir'.

OPTIONS

    -s src_dir

        use 'src_dir' as the un-populated (source) root directory

    -d dst_dir

        use 'dst_dir' as the place to put the populated root directory

    -l name1[:name2[...]]

        Always add the specified shared library/ies name1, name2... from the

        toolchain (in the sys-root). Actual library names are searched as

        follows (where 'name' is replaced with the given name) in the

        sys-root directory:

          - libname.so

          - name.so

          - name

        If the file is found, then the SONAME of the library is used, and the

        library is copied with that name. If the library was not found, this

        yields an error (unless -f was given).

    -L file

        Read 'file' for a list of shared libraries to always add from the

        toolchain. The file should contain one library name per line; text

        after a # is ignored until the end of the line; spaces are ignored;

        empty lines are ignored. Libraries are searched for as with -l.

    -f  force execution: if destination directory already exists, it will be

        removed first; if a specified library (above) was not found, continue.

    -v  Be verbose

_EOF_

}

CT_ROOT_SRC_DIR=

CT_ROOT_DST_DIR=

CT_LIB_LIST=

CT_LIB_FILE=

CT_FORCE=no

CT_ECHO=true

while getopts ":s:d:l:L:fvh" CT_OPT; do

    case "${CT_OPT}" in

        s)  CT_ROOT_SRC_DIR="${OPTARG}";;

        d)  CT_ROOT_DST_DIR="${OPTARG}";;

        l)  CT_LIB_LIST="${CT_LIB_LIST}:${OPTARG}";;

        L)  CT_LIB_FILE="${OPTARG}";;

        f)  CT_FORCE=y;;

        v)  CT_ECHO=echo;;

        h)  doHelp

            exit 0

            ;;

        :)  echo "$myname: '-${OPTARG}' takes exactly one argument."

            exit 1

            ;;

        ?)  echo "$myname: unknown option '-${OPTARG}'."

            exit 1

            ;;

    esac

done

# Sanity checks

if [ -z "${CT_ROOT_SRC_DIR}" -o -z "${CT_ROOT_DST_DIR}" ]; then

    doHelp

    exit 1

fi

if [ ! -d "${CT_ROOT_SRC_DIR}" ]; then

    echo "$myname: '${CT_ROOT_SRC_DIR}': no such file or directory"

    exit 1

fi

if [ -d "${CT_ROOT_DST_DIR}" -a "${CT_FORCE}" != "y" ]; then

    echo "$myname: '${CT_ROOT_DST_DIR}': already exists"

    exit 1

fi

src_inode=$(ls -di "${CT_ROOT_SRC_DIR}")

dst_inode=$(ls -di "${CT_ROOT_DST_DIR}" 2>/dev/null)

if [ "${src_inode}" = "${dst_inode}" ]; then

    echo "$myname: source and destination are the same!"

    exit 1

fi

# Check existence of the forced libraries file

if [ -n "${CT_LIB_FILE}" -a ! \( -f "${CT_LIB_FILE}" -a -r "${CT_LIB_FILE}" \) ]; then

    echo "$myname: forced libraries file '${CT_LIB_FILE}' not found!"

    exit 1

fi

# Get rid of potentially older destination directory

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

    mv "${CT_ROOT_DST_DIR}" "${CT_ROOT_DST_DIR}.$$"

    setsid nohup rm -rf "${CT_ROOT_DST_DIR}.$$" >/dev/null 2>&1 &

fi

# Create the working copy

mkdir -p "${CT_ROOT_DST_DIR}"

# Make all path absolute

CT_ROOT_SRC_DIR=$(cd "${CT_ROOT_SRC_DIR}"; pwd)

CT_ROOT_DST_DIR=$(cd "${CT_ROOT_DST_DIR}"; pwd)

pushd "${CT_ROOT_SRC_DIR}" >/dev/null

tar cf - . |(cd "${CT_ROOT_DST_DIR}"; tar xf -)

popd >/dev/null

# A function do search for a library

# Usage: do_add_lib libname

# returns: 0 if library was found and added, !0 otherwise

do_add_lib() {

    local libname="$1"

    local ret=1

    local true_libname

    for dir in . usr; do

        ${CT_ECHO} -n "    trying in '${dir}'"

        libfile="${CT_SYSROOT_DIR}/${dir}/lib/${libname}"

        ${CT_ECHO} ": '${libfile}'"

        if [ -e "${libfile}" ]; then

            mkdir -p "${dir}/lib"

            true_libname=$("${CT_READELF}" -d "${libfile}" |egrep "SONAME" |sed -r -e 's,.+\[(.+)\] *$,\1,;')

            ${CT_ECHO} "      installing as '${dir}/lib/${true_libname}'"

            cat "${libfile}" >"${dir}/lib/${true_libname}"

            ret=0

            break

        fi

    done

    return ${ret}

}

# First of, copy the forced libraries into the working copy

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

    lib_list=$(sed -r -e ':loop; s/#.*//; s/[[:space:]]+//g; s/([^:])$/\1:/; /$/N; s/\n//; tloop;' "${CT_LIB_FILE}")

    CT_LIB_LIST=$(echo "${CT_LIB_LIST}:${lib_list}" |sed -r -e 's/:+/:/g; s/^:+//; s/:+$//;')

fi

CT_LIB_LIST="${CT_LIB_LIST//:/ }"

${CT_ECHO} "Installing forced libraries..."

pushd "${CT_ROOT_DST_DIR}" >/dev/null

for name in ${CT_LIB_LIST}; do

    [ -z "${name}" ] && continue

    found=0

    for libname in "lib${name}.so" "${name}.so" "${name}"; do

        ${CT_ECHO} "  searching for '${libname}'"

        if do_add_lib "${libname}"; then

            found=1

            break

        fi

    done

    if [ ${found} -eq 0 ]; then

        echo "$myname: library '${libname}' not found!"

        [ "${CT_FORCE}" = y ] || exit 1

    fi

done

popd >/dev/null

# Parse the working copy for executables and libraries

pushd "${CT_ROOT_DST_DIR}" >/dev/null

still_needed=1

while [ ${still_needed} -eq 1 ]; do

    ${CT_ECHO} "Looping..."

    still_needed=0

    for f in $(find . -type f -exec file {} \; |egrep ': ELF [[:digit:]]+-bit .SB (executable|shared object),' |cut -d ":" -f 1); do

        ${CT_ECHO} "Scanning '${f}'"

        for libname in $("${CT_READELF}" -d "${f}" |egrep '(NEEDED)' |sed -r -e 's,.+\[(.+)\] *$,\1,;'); do

            ${CT_ECHO} "  searching for '${libname}'"

            if [    -e "lib/${libname}"     \

                 -o -e "usr/lib/${libname}" ]; then

                ${CT_ECHO} "    already present"

                continue

            fi

            if do_add_lib "${libname}"; then

                still_needed=1

            else

                echo "$myname: library '${libname}' not found!"

            fi

        done

    done

done

popd >/dev/null