[PATCH v2] strip: Use debugedit instead of AWK to parse source files

[Morten Linderud]

From: Morten Linderud <morten at linderud.pw>

This moves us from the fairly ugly AWK parsing line to debugedit which
originally comes out of the rpm project.

The original code has issues parsing anything that was not straight
C/C++ and languages like Rust or Go would return invalid source code
files. debugedit handles all these cases better.

Fixes FS#66755
Fixes FS#66888

Signed-off-by: Morten Linderud <morten at linderud.pw>
---
 scripts/libmakepkg/executable/debugedit.sh.in | 38 +++++++++++++++++++
 scripts/libmakepkg/tidy/strip.sh.in           | 25 +++++++++---
 2 files changed, 58 insertions(+), 5 deletions(-)
 create mode 100644 scripts/libmakepkg/executable/debugedit.sh.in

diff --git a/scripts/libmakepkg/executable/debugedit.sh.in b/scripts/libmakepkg/executable/debugedit.sh.in
new file mode 100644
index 00000000..ec0ab814
--- /dev/null
+++ b/scripts/libmakepkg/executable/debugedit.sh.in
@@ -0,0 +1,38 @@
+#!/usr/bin/bash
+#
+#   debugedit.sh - Confirm presence of debugedit binary
+#
+#   Copyright (c) 2011-2022 Pacman Development Team <pacman-dev at lists.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 "$LIBMAKEPKG_EXECUTABLE_DEBUGEDIT_SH" ]] && return
+LIBMAKEPKG_EXECUTABLE_DEBUGEDIT_SH=1
+
+LIBRARY=${LIBRARY:-'@libmakepkgdir@'}
+
+source "$LIBRARY/util/message.sh"
+source "$LIBRARY/util/option.sh"
+
+executable_functions+=('executable_debugedit')
+
+executable_debugedit() {
+	if check_option "debug" "y"; then
+		if ! type -p debugedit >/dev/null; then
+			error "$(gettext "Cannot find the %s binary required for source files in debug packages.")" "debugedit"
+			return 1
+		fi
+	fi
+}
diff --git a/scripts/libmakepkg/tidy/strip.sh.in b/scripts/libmakepkg/tidy/strip.sh.in
index 92a6fb15..84732c6f 100644
--- a/scripts/libmakepkg/tidy/strip.sh.in
+++ b/scripts/libmakepkg/tidy/strip.sh.in
@@ -36,8 +36,23 @@ build_id() {
 }
 
 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}}'
+	# debugedit rewrites the binary. In most cases this is handled by the gcc
+	# prefix-map switches which rewrites $srcdir to $dbgsrcdir. debugedit will
+	# not do anything in those cases. However for binaries that does not have a
+	# prefix-map debugedit is going to modify the binary correcting the paths.
+	#
+	# From the mailing list discussion:
+	# * Without -b/-d: it just lists all source files.
+	# * With -b, it prints all source files rooted in the specified directory, but strips the
+	#   prefix from the output.
+	# * With both -b and -d, it replaces any base-dir prefixes with dest-dir
+	#   (modifying the binary), then prints all paths rooted in the dest-dir
+	#   (again, stripping the dest-dir prefix in the output).
+	LANG=C debugedit --no-recompute-build-id \
+		--base-dir "${srcdir}" \
+		--dest-dir "${dbgsrcdir}" \
+		--list-file /dev/stdout "$1" \
+		| sort -zu | tr '\0' '\n'
 }
 
 strip_file() {
@@ -58,9 +73,9 @@ strip_file() {
 		# 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 $dest ]]; then
+			file="${srcdir}/${t}"
+			dest="${dbgsrc}/${t}"
+			if [[ -f "$file" ]] && ! [[ -f $dest ]]; then
 				mkdir -p "${dest%/*}"
 				cp -- "$file" "$dest"
 			fi
-- 
2.34.1