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path: root/scripts/libmakepkg/tidy/strip.sh.in
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#!/bin/bash
#
#   strip.sh - Strip debugging symbols from binary files
#
#   Copyright (c) 2007-2016 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; }'
}

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

                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 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="$pkgdir-@DEBUGSUFFIX@/usr/lib/debug"
                        mkdir -p "$dbgdir"
                fi

                local binary strip_flags
                find . -type f -perm -u+w -print0 2>/dev/null | while read -rd '' binary ; do
                        case "$(file -bi "$binary")" in
                                *application/x-sharedlib*)  # Libraries (.so)
                                        strip_flags="$STRIP_SHARED";;
                                *application/x-archive*)    # Libraries (.a)
                                        strip_flags="$STRIP_STATIC";;
                                *application/x-object*)
                                        case "$binary" in
                                                *.ko)                   # Kernel module
                                                        strip_flags="$STRIP_SHARED";;
                                                *)
                                                        continue;;
                                        esac;;
                                *application/x-executable*) # Binaries
                                        strip_flags="$STRIP_BINARIES";;
                                *)
                                        continue ;;
                        esac
                        strip_file "$binary" ${strip_flags}
                done
        fi
}