support/scripts: add fix-rpath script to sanitize the rpath
This commit introduces the script "fix-rpath" able to scan a tree, detect ELF files, check their RPATH and fix it in a proper way. The RPATH fixup is done by the patchelf utility using the option "--make-rpath-relative <root-directory>". Signed-off-by: Samuel Martin <s.martin49@gmail.com> Signed-off-by: Wolfgang Grandegger <wg@grandegger.com> Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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support/scripts/fix-rpath
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support/scripts/fix-rpath
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#!/usr/bin/env bash
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# Copyright (C) 2016 Samuel Martin <s.martin49@gmail.com>
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# Copyright (C) 2017 Wolfgang Grandegger <wg@grandegger.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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usage() {
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cat <<EOF >&2
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Usage: ${0} TREE_KIND
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Description:
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This script scans a tree and sanitize ELF files' RPATH found in there.
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Sanitization behaves the same whatever the kind of the processed tree,
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but the resulting RPATH differs. The rpath sanitization is done using
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"patchelf --make-rpath-relazive".
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Arguments:
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TREE_KIND Kind of tree to be processed.
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Allowed values: host, target, staging
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Environment:
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PATCHELF patchelf program to use
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(default: HOST_DIR/bin/patchelf)
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HOST_DIR host directory
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STAGING_DIR staging directory
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TARGET_DIR target directory
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TOOLCHAIN_EXTERNAL_DOWNLOAD_INSTALL_DIR
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(default HOST_DIR/opt/ext-toolchain)
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EOF
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}
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: ${PATCHELF:=${HOST_DIR}/bin/patchelf}
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# ELF files should not be in these sub-directories
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HOST_EXCLUDEPATHS="/share/terminfo"
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STAGING_EXCLUDEPATHS="/usr/include /usr/share/terminfo"
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main() {
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local rootdir
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local tree="${1}"
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local find_args=( )
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local sanitize_extra_args=( )
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case "${tree}" in
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host)
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rootdir="${HOST_DIR}"
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# do not process the sysroot (only contains target binaries)
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find_args+=( "-path" "${STAGING_DIR}" "-prune" "-o" )
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# do not process the external toolchain installation directory to
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# avoid breaking it.
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test "${TOOLCHAIN_EXTERNAL_DOWNLOAD_INSTALL_DIR}" != "" && \
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find_args+=( "-path" "${TOOLCHAIN_EXTERNAL_DOWNLOAD_INSTALL_DIR}" "-prune" "-o" )
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for excludepath in ${HOST_EXCLUDEPATHS}; do
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find_args+=( "-path" "${HOST_DIR}""${excludepath}" "-prune" "-o" );
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done
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# do not process the patchelf binary but a copy to work-around "file in use"
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find_args+=( "-path" "${PATCHELF}" "-prune" "-o" )
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cp "${PATCHELF}" "${PATCHELF}.__to_be_patched"
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# we always want $ORIGIN-based rpaths to make it relocatable.
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sanitize_extra_args+=( "--relative-to-file" )
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;;
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staging)
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rootdir="${STAGING_DIR}"
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# ELF files should not be in these sub-directories
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for excludepath in ${STAGING_EXCLUDEPATHS}; do
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find_args+=( "-path" "${STAGING_DIR}""${excludepath}" "-prune" "-o" )
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done
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# should be like for the target tree below
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sanitize_extra_args+=( "--no-standard-lib-dirs" )
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;;
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target)
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rootdir="${TARGET_DIR}"
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# we don't want $ORIGIN-based rpaths but absolute paths without rootdir.
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# we also want to remove rpaths pointing to /lib or /usr/lib.
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sanitize_extra_args+=( "--no-standard-lib-dirs" )
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;;
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*)
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usage
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exit 1
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;;
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esac
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find_args+=( "-type" "f" "-print" )
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while read file ; do
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# check if it's an ELF file
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if ${PATCHELF} --print-rpath "${file}" > /dev/null 2>&1; then
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# make files writable if necessary
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changed=$(chmod -c u+w "${file}")
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# call patchelf to sanitize the rpath
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${PATCHELF} --make-rpath-relative "${rootdir}" ${sanitize_extra_args[@]} "${file}"
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# restore the original permission
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test "${changed}" != "" && chmod u-w "${file}"
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fi
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done < <(find "${rootdir}" ${find_args[@]})
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# Restore patched patchelf utility
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test "${tree}" = "host" && mv "${PATCHELF}.__to_be_patched" "${PATCHELF}"
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# ignore errors
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return 0
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}
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main ${@}
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