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#!/usr/bin/env bash
# This script scans $(HOST_DIR)/{bin,sbin} for all ELF files, and checks
# they have an RPATH to $(HOST_DIR)/lib if they need libraries from
# there.
# Override the user's locale so we are sure we can parse the output of
# readelf(1) and file(1)
export LC_ALL=C
main() {
local pkg="${1}"
local hostdir="${2}"
local file ret
# Remove duplicate and trailing '/' for proper match
hostdir="$( sed -r -e 's:/+:/:g; s:/$::;' <<<"${hostdir}" )"
ret=0
while read file; do
is_elf "${file}" || continue
elf_needs_rpath "${file}" "${hostdir}" || continue
check_elf_has_rpath "${file}" "${hostdir}" && continue
if [ ${ret} -eq 0 ]; then
ret=1
printf "***\n"
printf "*** ERROR: package %s installs executables without proper RPATH:\n" "${pkg}"
fi
printf "*** %s\n" "${file}"
done < <( find "${hostdir}"/{bin,sbin} -type f 2>/dev/null )
return ${ret}
}
is_elf() {
local f="${1}"
readelf -l "${f}" 2>/dev/null \
|grep -E 'Requesting program interpreter:' >/dev/null 2>&1
}
# This function tells whether a given ELF executable (first argument)
# needs a RPATH pointing to the host library directory or not. It
# needs such an RPATH if at least of the libraries used by the ELF
# executable is available in the host library directory. This function
# returns 0 when a RPATH is needed, 1 otherwise.
elf_needs_rpath() {
local file="${1}"
local hostdir="${2}"
local lib
while read lib; do
[ -e "${hostdir}/lib/${lib}" ] && return 0
done < <( readelf -d "${file}" \
|sed -r -e '/^.* \(NEEDED\) .*Shared library: \[(.+)\]$/!d;' \
-e 's//\1/;' \
)
return 1
}
# This function checks whether at least one of the RPATH of the given
# ELF executable (first argument) properly points to the host library
# directory (second argument), either through an absolute RPATH or a
# relative RPATH. Having such a RPATH will make sure the ELF
# executable will find at runtime the shared libraries it depends
# on. This function returns 0 when a proper RPATH was found, or 1
# otherwise.
check_elf_has_rpath() {
local file="${1}"
local hostdir="${2}"
local rpath dir
while read rpath; do
for dir in ${rpath//:/ }; do
# Remove duplicate and trailing '/' for proper match
dir="$( sed -r -e 's:/+:/:g; s:/$::;' <<<"${dir}" )"
[ "${dir}" = "${hostdir}/lib" ] && return 0
[ "${dir}" = "\$ORIGIN/../lib" ] && return 0
done
done < <( readelf -d "${file}" \
|sed -r -e '/.* \(R(UN)?PATH\) +Library r(un)?path: \[(.+)\]$/!d' \
-e 's//\3/;' \
)
return 1
}
main "${@}"
|
