Send patches - preferably formatted by git format-patch - to patches at archlinux32 dot org.
summaryrefslogtreecommitdiff
path: root/scripts/libmakepkg/tidy/strip.sh.in
blob: 2b6f732dc58239ff18f3b2a69f5f242ffa9d2aae (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
#!/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 f t
		while IFS= read -r t; do
			f=${t/${dbgsrcdir}/"$srcdir"}
			mkdir -p "${dbgsrc/"$dbgsrcdir"/}${t%/*}"
			cp -- "$f" "${dbgsrc/"$dbgsrcdir"/}$t"
		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
}