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https://github.com/crosstool-ng/crosstool-ng.git
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a67a23877f
Merge the source rootfs into the (pre-existing) destination rootfs, and populate the result accordingly.
261 lines
8.8 KiB
Plaintext
261 lines
8.8 KiB
Plaintext
#!@@CT_bash@@
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# This script will populate the root directory with libs from the sysroot.
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# (C) 2007 Yann E. MORIN
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# Licensed under the GPL v2
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set -e
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# Detect where the toolchain is:
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CT_PREFIX_DIR="$(cd "$(dirname "$0")/.."; pwd)"
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CT_BIN_DIR="${CT_PREFIX_DIR}/bin"
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CT_READELF="${CT_BIN_DIR}/@@CT_TARGET@@-readelf"
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CT_LIB_DIR="${CT_PREFIX_DIR}/lib"
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CT_SYSROOT_DIR="$(cd "${CT_BIN_DIR}/../@@CT_TARGET@@/sys-root"; pwd)"
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myname=$(basename "$0")
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# Use the tools discovered by crosstool-NG's ./configure:
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install="@@CT_install@@"
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grep="@@CT_grep@@"
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sed="@@CT_sed@@"
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doHelp() {
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cat <<_EOF_
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NAME
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$myname - populate the target root file system
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SYNOPSIS
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$myname OPTIONS -s source_root -d destination_root
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DESCRIPTION
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$myname will 'populate' your target root file system ('src_dir') with
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libraries from the toolchain (eg. libc.so...), storing the result into
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'dst_dir'.
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OPTIONS
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-s src_dir
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use 'src_dir' as the un-populated (source) root directory
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-d dst_dir
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use 'dst_dir' as the place to put the populated root directory
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-r sysroot_dir
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use 'sysroot_dir' as the sysroot instead of the toolchain default
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-l name1[:name2[...]]
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Always add the specified shared library/ies name1, name2... from the
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toolchain (in the sys-root). Actual library names are searched as
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follows (where 'name' is replaced with the given name) in the
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sys-root directory:
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- libname.so
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- name.so
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- name
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If the file is found, then the SONAME of the library is used, and the
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library is copied with that name. If the library was not found, this
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yields an error (unless -f was given).
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-L file
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Read 'file' for a list of shared libraries to always add from the
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toolchain. The file should contain one library name per line; text
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after a # is ignored until the end of the line; spaces are ignored;
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empty lines are ignored. Libraries are searched for as with -l.
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-f force execution: if destination directory already exists, it will be
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removed first; if a specified library (above) was not found, continue.
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Note: if using -m and the destination directory already exists, it
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is *not* removed, see below.
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-m Merge the source root directory with the destination root directory.
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If the latter does not exist, it is created, and -m is ignored.
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If the destination droot directory exists, then the content of the
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source root directory is copied in there, and the result is populated
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as usual.
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It can be usefull if constructing a rootfs incrementally from many
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smaller source root directories, or if your destination root directory
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is an NFS export that your target mounts as / (and you don't want to
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re-run exportfs -av everytime). USE WITH CARE!
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-v Be verbose. By default, populate is absolutely silent.
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_EOF_
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}
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CT_ROOT_SRC_DIR=
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CT_ROOT_DST_DIR=
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CT_LIB_LIST=
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CT_LIB_FILE=
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CT_MERGE=
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CT_FORCE=
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CT_PRINTF=:
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OPTIND=1
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while getopts ":s:d:r:l:L:fmvh" CT_OPT; do
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case "${CT_OPT}" in
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s) CT_ROOT_SRC_DIR="${OPTARG}";;
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d) CT_ROOT_DST_DIR="${OPTARG}";;
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r) CT_SYSROOT_DIR="${OPTARG}";;
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l) CT_LIB_LIST="${CT_LIB_LIST}:${OPTARG}";;
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L) CT_LIB_FILE="${OPTARG}";;
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f) CT_FORCE=y;;
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m) CT_MERGE=y;;
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v) CT_PRINTF=printf;;
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h) doHelp
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exit 0
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;;
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:) echo "$myname: '-${OPTARG}' takes exactly one argument."
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exit 1
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;;
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?) echo "$myname: unknown option '-${OPTARG}'."
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exit 1
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;;
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esac
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done
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# Sanity checks
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if [ -z "${CT_ROOT_SRC_DIR}" -o -z "${CT_ROOT_DST_DIR}" ]; then
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doHelp
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exit 1
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fi
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if [ ! -d "${CT_ROOT_SRC_DIR}" ]; then
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echo "$myname: '${CT_ROOT_SRC_DIR}': no such file or directory"
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exit 1
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fi
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if [ ! -d "${CT_SYSROOT_DIR}" ]; then
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echo "$myname: '${CT_SYSROOT_DIR}': no such file or directory"
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exit 1
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fi
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# If the dest dir does not exist, all is well
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# If merging, we accept an existing dest directory
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# If forcing and not merging, we remove an exiting dest directory
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# If not forcing and not merging, we do not accept an exiting dest directory
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if [ -d "${CT_ROOT_DST_DIR}" ]; then
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case "${CT_FORCE}:${CT_MERGE}" in
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*:y) ;;
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y:) rm -rf "${CT_ROOT_DST_DIR}";;
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:) echo "$myname: '${CT_ROOT_DST_DIR}': already exists" && exit 1 ;;
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esac
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fi
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src_inode=$(stat -c '%i' "${CT_ROOT_SRC_DIR}/.")
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dst_inode=$(stat -c '%i' "${CT_ROOT_DST_DIR}/." 2>/dev/null || true)
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if [ "${src_inode}" -eq "$((dst_inode+0))" ]; then
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echo "$myname: source and destination are the same!"
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exit 1
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fi
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# Check existence of the forced libraries file
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if [ -n "${CT_LIB_FILE}" -a ! \( -f "${CT_LIB_FILE}" -a -r "${CT_LIB_FILE}" \) ]; then
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echo "$myname: forced libraries file '${CT_LIB_FILE}' not found!"
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exit 1
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fi
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# Create the working copy, no issue if already existing
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mkdir -p "${CT_ROOT_DST_DIR}"
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# Make all path absolute
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CT_ROOT_SRC_DIR=$(cd "${CT_ROOT_SRC_DIR}"; pwd)
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CT_ROOT_DST_DIR=$(cd "${CT_ROOT_DST_DIR}"; pwd)
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# Populate the destination directory with files from the source directory
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pushd "${CT_ROOT_SRC_DIR}" >/dev/null
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cp -a . "${CT_ROOT_DST_DIR}"
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popd >/dev/null
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# A function do search for a library
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# Usage: do_add_lib libname
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# returns: 0 if library was found and added, !0 otherwise
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do_add_lib() {
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local libname="$1"
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local true_libname
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local dir
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local mode
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for dir in lib usr/lib; do
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${CT_PRINTF} " trying in '%s'" "${dir}"
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libfile="${CT_SYSROOT_DIR}/${dir}/${libname}"
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${CT_PRINTF} ": '%s'\n" "${libfile}"
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if [ -e "${libfile}" ]; then
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mkdir -p "${dir}"
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true_libname=$("${CT_READELF}" -d "${libfile}" \
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|"${grep}" "Library soname:" \
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|"${sed}" -r -e 's,.+\[(.+)\] *$,\1,;' \
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)
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case "${libfile}" in
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*/ld*) mode=0755;;
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*) mode=0644;;
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esac
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${CT_PRINTF} " installing as '%s/%s', mode='%s'\n" "${dir}" "${true_libname}" "${mode}"
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"${install}" -m "${mode}" "${libfile}" "${dir}/${true_libname}"
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return 0
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break
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fi
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done
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return 1
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}
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# We'll work in the copied rootfs
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pushd "${CT_ROOT_DST_DIR}" >/dev/null
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# First of, copy the forced libraries into the working copy
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if [ -n "${CT_LIB_FILE}" ]; then
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lib_list=$("${sed}" -r -e ':loop; s/#.*//;' \
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-e 's/[[:space:]]+//g;' \
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-e 's/([^:])$/\1:/;' \
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-e '/$/N; s/\n//; tloop;' \
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"${CT_LIB_FILE}"
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)
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CT_LIB_LIST=$(echo "${CT_LIB_LIST}:${lib_list}" \
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|"${sed}" -r -e 's/:+/:/g; s/^:+//; s/:+$//;' \
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)
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fi
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CT_LIB_LIST=$(echo "${CT_LIB_LIST}:${lib_list}" \
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|"${sed}" -r -e 's/^:+//; s/:+$//; s/:+/ /g;' \
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)
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if [ -n "${CT_LIB_LIST}" ]; then
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${CT_PRINTF} "Installing forced libraries...\n"
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for name in ${CT_LIB_LIST}; do
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[ -z "${name}" ] && continue
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found=0
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for libname in "lib${name}.so" "${name}.so" "${name}"; do
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${CT_PRINTF} " searching for '%s'\n" "${libname}"
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if do_add_lib "${libname}"; then
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found=1
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break
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fi
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done
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if [ ${found} -eq 0 ]; then
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echo "$myname: library '${libname}' not found!"
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[ "${CT_FORCE}" = y ] || exit 1
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fi
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done
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fi
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# Parse the working copy for executables and libraries
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still_needed=1
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while [ ${still_needed} -eq 1 ]; do
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${CT_PRINTF} "Looping...\n"
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still_needed=0
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for f in $(find . -type f -exec file {} \; \
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|"${grep}" -E ': ELF [[:digit:]]+-bit (L|M)SB (executable|shared object),' \
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|cut -d ":" -f 1 \
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); do
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${CT_PRINTF} "Scanning '%s'\n" "${f}"
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for libname in $("${CT_READELF}" -d "${f}" \
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|"${grep}" -E '\(NEEDED\)[[:space:]]+Shared library:' \
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|"${sed}" -r -e 's,.+\[(.+)\] *$,\1,;' \
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); do
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${CT_PRINTF} " searching for '%s'\n" "${libname}"
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if [ -e "lib/${libname}" \
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-o -e "usr/lib/${libname}" ]; then
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${CT_PRINTF} " already present\n"
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continue
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fi
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if do_add_lib "${libname}"; then
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still_needed=1
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else
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echo "$myname: library '${libname}' not found!"
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fi
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done
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done
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done
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# OK, we're done. Back off.
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popd >/dev/null
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