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#!/usr/bin/bash
#
# strip.sh - Strip debugging symbols from binary files
#
# Copyright (c) 2007-2021 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:-'/usr/share/makepkg'}
source "$LIBRARY/util/message.sh"
source "$LIBRARY/util/option.sh"
packaging_options+=('strip' 'debug')
tidy_modify+=('tidy_strip')
source_files() {
LANG=C readelf "$1" --debug-dump 2>/dev/null | \
awk '/DW_AT_name +:/{name=$NF}/DW_AT_comp_dir +:/{{if (name == "<artificial>") next}{if (name !~ /^[<\/]/) {printf "%s/", $NF}}{print name}}'
}
strip_file() {
local binary=$1; shift
case "$(file -bi "$binary")" in
*application/x-dosexec* | *application/vnd.microsoft.portable-executable*)
if check_option "debug" "y"; then
if [[ -f "$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%/*}"
msg2 "Separating debug info from $binary into $dbgdir/$binary.debug"
# create a dbg file with proper debug info:
objcopy --only-keep-debug "$binary" "$dbgdir/$binary.debug"
msg2 "Creating a debuginfo link to $dbgdir/$binary.debug in $binary"
local tempfile=$(mktemp "$binary.XXXXXX")
objcopy --add-gnu-debuglink="$dbgdir/${binary#/}.debug" "$binary" "$tempfile"
cat "$tempfile" > "$binary"
rm "$tempfile"
msg2 "Separating (again) debug info from $binary into $dbgdir/$binary.debug"
objcopy --only-keep-debug "$binary" "$dbgdir/$binary.debug"
msg2 "Removing old .gnu_debuglink section from $binary"
objcopy --remove-section=.gnu_debuglink "$binary"
# strip debug-info from the original file
objcopy --strip-debug "$binary"
msg2 "Creating (again) a debuginfo link to $dbgdir/$binary.debug in $binary"
tempfile=$(mktemp "$binary.XXXXXX")
objcopy --add-gnu-debuglink="$dbgdir/${binary#/}.debug" "$binary" "$tempfile"
cat "$tempfile" > "$binary"
rm "$tempfile"
# This way dbg file gets a .gnu_debuglink section (doesn't matter where
# it's pointing), and its contents pass the CRC32 check
# 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)
fi
;;
esac
local tempfile=$(mktemp "$binary.XXXXXX")
if strip "$@" "$binary" -o "$tempfile"; then
cat "$tempfile" > "$binary"
fi
rm -f "$tempfile"
}
strip_lto() {
local binary=$1;
local tempfile=$(mktemp "$binary.XXXXXX")
if strip -R .gnu.lto_* -R .gnu.debuglto_* -N __gnu_lto_v1 "$binary" -o "$tempfile"; then
cat "$tempfile" > "$binary"
fi
rm -f "$tempfile"
}
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/$pkgbase-debug"
dbgsrcdir="${DBGSRCDIR:-/usr/src/debug}"
dbgsrc="$pkgdirbase/$pkgbase-debug$dbgsrcdir"
mkdir -p "$dbgdir" "$dbgsrc"
fi
local binary strip_flags
# *.so: Apache2 modules, OCaml stublibs, Ruby modules
# *.oct: Octave modules
# *.cmxs: OCaml natdynlink modules: http://gallium.inria.fr/~frisch/ndl.txt
find * -type f ! -name '*.dll.a' ! -name '*.lib' \
-a \( -name '*.a' -o -name '*.dll' -o -name '*.exe' -o -name '*.so' -o -name '*.so.*' -o -name '*.oct' -o -name '*.cmxs' \) -print0 \
-o -type f -executable ! -name '*.dll' ! -name '*.exe' ! -name '*.so' ! -name '*.so.[0-9]*' ! -name '*.oct' ! -name '*.cmxs' ! -name '*.a' ! -name '*.la' ! -name '*.lib' ! -name '*.exe.manifest' ! -name '*.exe.config' ! -name '*.dll.config' ! -name '*.mdb' ! -name '*-config' ! -name '*.csh' ! -name '*.sh' ! -name '*.pl' ! -name '*.pm' ! -name '*.py' ! -name '*.rb' ! -name '*.tcl' -print0 | \
while IFS= read -d $'\0' binary
do
local STRIPLTO=0
# Skip thin archives from stripping
case "${binary##*/}" in
*.a)
if [ "$(head -c 7 "${binary}")" = '!<thin>' ]
then
continue
fi
;;
esac
# assure this is actually a binary object
if [ "$(head -c 2 "${binary}")" = '#!' ]
then
# sometimes .exe will be appended where it does not belong
case "${exe}" in
usr/lib/hevea/*.exe) ;;
*.exe) mv "${binary}" "${binary%.exe}" ;;
esac
continue
fi
# OCaml bytecode must not be stripped
# Magic number is at end of file:
# http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=256900#74
# http://cygwin.com/ml/cygwin-apps/2010-10/msg00057.html
#
# Perl Archive (PAR) binaries must not be stripped
# https://rt.cpan.org/Public/Bug/Display.html?id=18536
# http://cygwin.com/ml/cygwin-apps/2012-07/msg00088.html
case $(tail -c 12 "${binary}" | tr '\012\0' '%') in
%PAR\.pm%) continue ;;
Caml1999X0[0-9][0-9]) continue ;;
esac
# Mono assemblies must not be stripped, but remove .mdb debug symbols,
# and make them non-executable so they're not launched by MS .NET
if LC_ALL=C file -b "${binary}" 2>&1 | grep -q "Mono/\.Net assembly"
then
chmod 0644 "${binary}"
rm -f "${binary}.mdb"
continue
fi
# check for .exe from non-automake Makefile which install(1) didn't fix
# strip(1) used to take care of this, but not anymore
case ${CHOST} in
*-*-cygwin*|*-*-mingw*|*-*-msys*)
case "${binary##*/}" in
*.dll|*.exe|*.sfx|*.so|*.so.[0-9]*|*.oct|*.cmxs) ;;
# make sure this isn't some oddly named DLL
*) if LANG=en_US.UTF-8 LC_ALL=C objdump -f "${binary}" | grep -Eq '^start address 0x(0000000[01])?00401[0-9a-e][0-9a-e]0'
then
mv "${binary}" "${binary}.exe"
binary+=.exe
fi ;;
esac
;;
esac
chmod 0755 "${binary}";
case "$(file -S -bi "$binary")" in
*application/x-dosexec*) # Windows executables and dlls (file <=5.43)
strip_flags="$STRIP_SHARED";;
*application/vnd.microsoft.portable-executable*) # Windows executables and dlls (file >=5.44)
strip_flags="$STRIP_SHARED";;
*application/x-archive*) # Static and Import Libraries (*.a and *.dll.a)
strip_flags="$STRIP_STATIC"
STRIPLTO=1;;
*application/x-sharedlib*) # Libraries (.so)
strip_flags="$STRIP_SHARED";;
*Type:*'DYN (Position-Independent Executable file)'*) # 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"
STRIPLTO=1
elif [[ $binary = *'.ko' ]]; then # Kernel module
strip_flags="$STRIP_SHARED"
else
continue
fi
;;
*)
continue ;;
esac
strip_file "$binary" ${strip_flags}
(( STRIPLTO )) && strip_lto "$binary"
done
fi
}