#!/usr/bin/env bash
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# This script scans $(HOST_DIR)/{bin,sbin} for all ELF files, and checks
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# they have an RPATH to $(HOST_DIR)/lib if they need libraries from
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# there.
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# Override the user's locale so we are sure we can parse the output of
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# readelf(1) and file(1)
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export LC_ALL=C
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main() {
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local pkg="${1}"
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local hostdir="${2}"
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local perpackagedir="${3}"
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local file ret
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# Remove duplicate and trailing '/' for proper match
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hostdir="$( sed -r -e 's:/+:/:g; s:/$::;' <<<"${hostdir}" )"
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ret=0
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while read file; do
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is_elf "${file}" || continue
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elf_needs_rpath "${file}" "${hostdir}" || continue
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check_elf_has_rpath "${file}" "${hostdir}" "${perpackagedir}" && continue
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if [ ${ret} -eq 0 ]; then
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ret=1
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printf "***\n"
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printf "*** ERROR: package %s installs executables without proper RPATH:\n" "${pkg}"
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fi
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printf "*** %s\n" "${file}"
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done < <( find "${hostdir}"/{bin,sbin} -type f 2>/dev/null )
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return ${ret}
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}
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is_elf() {
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local f="${1}"
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readelf -l "${f}" 2>/dev/null \
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|grep -E 'Requesting program interpreter:' >/dev/null 2>&1
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}
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# This function tells whether a given ELF executable (first argument)
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# needs a RPATH pointing to the host library directory or not. It
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# needs such an RPATH if at least of the libraries used by the ELF
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# executable is available in the host library directory. This function
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# returns 0 when a RPATH is needed, 1 otherwise.
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#
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# With per-package directory support, ${hostdir} will point to the
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# current package per-package host directory, and this is where this
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# function will check if the libraries needed by the executable are
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# located (or not). In practice, the ELF executable RPATH may point to
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# another package per-package host directory, but that is fine because
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# if such an executable is within the current package per-package host
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# directory, its libraries will also have been copied into the current
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# package per-package host directory.
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elf_needs_rpath() {
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local file="${1}"
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local hostdir="${2}"
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local lib
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while read lib; do
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[ -e "${hostdir}/lib/${lib}" ] && return 0
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done < <( readelf -d "${file}" \
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|sed -r -e '/^.* \(NEEDED\) .*Shared library: \[(.+)\]$/!d;' \
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-e 's//\1/;' \
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)
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return 1
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}
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# This function checks whether at least one of the RPATH of the given
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# ELF executable (first argument) properly points to the host library
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# directory (second argument), either through an absolute RPATH or a
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# relative RPATH. In the context of per-package directory support,
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# ${hostdir} (second argument) points to the current package host
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# directory. However, it is perfectly valid for an ELF binary to have
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# a RPATH pointing to another package per-package host directory,
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# which is why such RPATH is also accepted (the per-package directory
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# gets passed as third argument). Having a RPATH pointing to the host
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# directory will make sure the ELF executable will find at runtime the
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# shared libraries it depends on. This function returns 0 when a
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# proper RPATH was found, or 1 otherwise.
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check_elf_has_rpath() {
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local file="${1}"
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local hostdir="${2}"
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local perpackagedir="${3}"
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local rpath dir
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while read rpath; do
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for dir in ${rpath//:/ }; do
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# Remove duplicate and trailing '/' for proper match
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dir="$( sed -r -e 's:/+:/:g; s:/$::;' <<<"${dir}" )"
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[ "${dir}" = "${hostdir}/lib" ] && return 0
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[ "${dir}" = "\$ORIGIN/../lib" ] && return 0
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# This check is done even for builds where
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# BR2_PER_PACKAGE_DIRECTORIES is disabled. In this case,
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# PER_PACKAGE_DIR and therefore ${perpackagedir} points to
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# a non-existent directory, and this check will always be
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# false.
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[[ ${dir} =~ ${perpackagedir}/[^/]+/host/lib ]] && return 0
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done
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done < <( readelf -d "${file}" \
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|sed -r -e '/.* \(R(UN)?PATH\) +Library r(un)?path: \[(.+)\]$/!d' \
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-e 's//\3/;' \
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)
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return 1
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}
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main "${@}"
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