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#!/bin/bash
#
# strip.sh - Strip debugging symbols from binary files
#
# Copyright (c) 2007-2020 Pacman Development Team <pacman-dev@archlinux.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
[[ -n "$LIBMAKEPKG_TIDY_STRIP_SH" ]] && return
LIBMAKEPKG_TIDY_STRIP_SH=1
LIBRARY=${LIBRARY:-'@libmakepkgdir@'}
source "$LIBRARY/util/message.sh"
source "$LIBRARY/util/option.sh"
packaging_options+=('strip' 'debug')
tidy_modify+=('tidy_strip')
build_id() {
LANG=C readelf -n "$1" | sed -n '/Build ID/ { s/.*: //p; q; }'
}
source_files() {
LANG=C readelf "$1" --debug-dump | \
awk '/DW_AT_name +:/{name=$8}/DW_AT_comp_dir +:/{{if (name == "<artificial>") next}{if (name !~ /^[<\/]/) {printf "%s/", $8}}{print name}}'
}
strip_file() {
local binary=$1; shift
if check_option "debug" "y"; then
local bid=$(build_id "$binary")
# has this file already been stripped
if [[ -n "$bid" ]]; then
if [[ -f "$dbgdir/.build-id/${bid:0:2}/${bid:2}.debug" ]]; then
return
fi
elif [[ -f "$dbgdir/$binary.debug" ]]; then
return
fi
# copy source files to debug directory
local file dest t
while IFS= read -r t; do
file=${t/${dbgsrcdir}/"$srcdir"}
dest="${dbgsrc/"$dbgsrcdir"/}$t"
if ! [[ -f $dest ]]; then
mkdir -p "${dest%/*}"
cp -- "$file" "$dest"
fi
done < <(source_files "$binary")
# copy debug symbols to debug directory
mkdir -p "$dbgdir/${binary%/*}"
objcopy --only-keep-debug "$binary" "$dbgdir/$binary.debug"
objcopy --add-gnu-debuglink="$dbgdir/${binary#/}.debug" "$binary"
# create any needed hardlinks
while IFS= read -rd '' file ; do
if [[ "${binary}" -ef "${file}" && ! -f "$dbgdir/${file}.debug" ]]; then
mkdir -p "$dbgdir/${file%/*}"
ln "$dbgdir/${binary}.debug" "$dbgdir/${file}.debug"
fi
done < <(find . -type f -perm -u+w -print0 2>/dev/null)
if [[ -n "$bid" ]]; then
local target
mkdir -p "$dbgdir/.build-id/${bid:0:2}"
target="../../../../../${binary#./}"
target="${target/..\/..\/usr\/lib\/}"
target="${target/..\/usr\/}"
ln -s "$target" "$dbgdir/.build-id/${bid:0:2}/${bid:2}"
target="../../${binary#./}.debug"
ln -s "$target" "$dbgdir/.build-id/${bid:0:2}/${bid:2}.debug"
fi
fi
strip $@ "$binary"
}
tidy_strip() {
if check_option "strip" "y"; then
msg2 "$(gettext "Stripping unneeded symbols from binaries and libraries...")"
# make sure library stripping variables are defined to prevent excess stripping
[[ -z ${STRIP_SHARED+x} ]] && STRIP_SHARED="-S"
[[ -z ${STRIP_STATIC+x} ]] && STRIP_STATIC="-S"
if check_option "debug" "y"; then
dbgdir="$pkgdirbase/$pkgbase-@DEBUGSUFFIX@/usr/lib/debug"
dbgsrcdir="${DBGSRCDIR:-/usr/src/debug}"
dbgsrc="$pkgdirbase/$pkgbase-@DEBUGSUFFIX@$dbgsrcdir"
mkdir -p "$dbgdir" "$dbgsrc"
fi
local binary strip_flags
find . -type f -perm -u+w -print0 2>/dev/null | while IFS= read -rd '' binary ; do
case "$(LC_ALL=C readelf -h "$binary" 2>/dev/null)" in
*Type:*'DYN (Shared object file)'*) # Libraries (.so) or Relocatable binaries
strip_flags="$STRIP_SHARED";;
*Type:*'EXEC (Executable file)'*) # Binaries
strip_flags="$STRIP_BINARIES";;
*Type:*'REL (Relocatable file)'*) # Libraries (.a) or objects
if ar t "$binary" &>/dev/null; then # Libraries (.a)
strip_flags="$STRIP_STATIC"
elif [[ $binary = *'.ko' ]]; then # Kernel module
strip_flags="$STRIP_SHARED"
else
continue
fi
;;
*)
continue ;;
esac
strip_file "$binary" ${strip_flags}
done
fi
}
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