#!/bin/sh -efu
#
# brp-debuginfo - generate /usr/lib/debug and /usr/src/debug contents
# for debuginfo packages
#
# Written by Alexey Tourbin <at@altlinux.org>.  Based on find-debuginfo.sh
# by Jeff Johnson <jbj@rpm5.org> and Roland McGrath <roland@redhat.com>.
# Copyright (c) 2020 Vitaly Chikunov <vt@altlinux.org>.
# License: GPLv2+.

. @RPMCONFIGDIR@/rpmb-functions
ValidateBuildRoot

cd "$RPM_BUILD_ROOT"

rm -rf .tmp
mkdir .tmp

# Strip binaries, create .debug files under /usr/lib/debug and install sources into /usr/src/debug.

: ${RPM_DEBUGINFO_SKIPLIST:=}
: ${RPM_DEBUGINFO_STRIPPED_TERMINATE:=}

prune_paths="/lib/firmware /usr/lib/debug /usr/share /usr/src $RPM_DEBUGINFO_SKIPLIST"
prune_tests="$(printf %s "$prune_paths" |
		tr '[:space:]' '\n' |
		sort -u |
		sed -n '/^\// s/.*/ -o -path .&/p')"
find . '(' -path './.*' $prune_tests ')' -prune -o -type f -print |sort |
file4 -NF$'\t' -f - >.tmp/file_full

sed -n -e 's/\t.* ELF .* \(executable\|shared object\), .*, stripped.*//p' <.tmp/file_full >.tmp/fstripped
if [ -s .tmp/fstripped ]; then
	howmuch=$(wc -l <.tmp/fstripped)
	Warning "You have $howmuch stripped ELF objects. Please compile with debugging information!"
	Warning "An excerpt from the list of affected files follows:"
	sed 's/^/  /; 10q' <.tmp/fstripped >&2
	[ -z "$RPM_DEBUGINFO_STRIPPED_TERMINATE" ] \
		|| Fatal "Stripped files found, terminating build"
fi

sed -n -e '/ ELF .* shared object, no machine, /d' \
       -e 's/\t.* ELF .* \(executable\|shared object\), .*, not stripped.*//p' \
       -e 's/^\(\.\/lib\/modules\/[^[:space:]]\+\.ko\)\t.* ELF .* relocatable, .*, not stripped.*/\1/p' \
       -e 's/^\(\.\/lib\/modules\/[^[:space:]]\+\.ko\.[gx]z\)\t.* \(gzip\|xz\) compressed data.*/\1/p' \
       -e 's/^\(\.\/lib\/modules\/[^[:space:]]\+\.ko\.zst\)\t.* Zstandard compressed data.*/\1/p' \
       -e 's/^\(\.\/boot\/vmlinuz-[^[:space:]]\+\)\t.*/\1/p' <.tmp/file_full |
xargs -r --delimiter='\n' stat -c '%h %i %n' >.tmp/flist

# Filter out what will be hard-linked later and process the rest.
while read -r nlink ino f; do
	if [ "$nlink" -gt 1 ]; then
		eval f0="\${f0_$ino-}"
		if [ -n "$f0" ]; then
			printf '%u %s\n' "$ino" "$f" >&3
			continue
		else
			eval f0_$ino="\$f"
		fi
	fi
	printf '%s\n' "$f"
done <.tmp/flist \
     >.tmp/xargs-list \
    3>.tmp/link-list

xargs -r -P$(nproc) -n1 @RPMCONFIGDIR@/process-debuginfo <.tmp/xargs-list

# Hard-link debuginfo for hard-linked binaries
while read -r ino f; do
	debugf=./usr/lib/debug${f#.}.debug
	eval f0="\${f0_$ino-}"
	debugf0=./usr/lib/debug${f0#.}.debug
	if [ -f "$debugf0" ]; then
		mkdir -p "${debugf%/*}"
		ln -nf "$debugf0" "$debugf"
	fi
	mkdir -p .debuginfo/src/"${f%/*}"
	ln -nf .debuginfo/src/"$f0" .debuginfo/src/"$f"
done <.tmp/link-list

# Make symbolic links that mimic the original tree.
find . '(' -path './.*' $prune_tests ')' -prune -o -type l -print |sort >.tmp/flist
while read -r l; do
	f=$(readlink -vm "$l")
	f=${f#$RPM_BUILD_ROOT}
	debugf=./usr/lib/debug$f.debug
	[ -f "$debugf" ] || continue
	debugl=./usr/lib/debug${l#.}.debug
	mkdir -p "${debugl%/*}"
	ln -snf "$(relative "${debugf#.}" "${debugl#.}")" "$debugl"
	mkdir -p .debuginfo/links/"${debugf%/*}"
	printf '%s\n' "${debugl#.}" >>.debuginfo/links/"$debugf"
done <.tmp/flist

if [ -s .tmp/no_debug_info ]; then
	howmuch=$(wc -l < .tmp/no_debug_info)
	Warning "$howmuch non-stripped binaries don't contain .debug sections making -debuginfo"
	Warning "package less relevant. An excerpt from the list of affected files follows:"
	sed 's/^/  /; 10q' < .tmp/no_debug_info >&2
	if grep -E -q '/lib/modules/.*(/vmlinux|\.ko)$' .tmp/no_debug_info; then
		Warning "Please enable CONFIG_DEBUG_INFO=y in the kernel package!"
	fi
	[ -z "$RPM_DEBUGINFO_STRIPPED_TERMINATE" ] \
		|| Fatal "Files with stripped .debug_info found, terminating build"
fi

if [ -n "$(find usr/lib/debug -type f -print -quit 2>/dev/null)" ] &&
   [ -z "$(find usr/src/debug -type f -print -quit 2>/dev/null)" ]; then
	Warning 'debuginfo without debug sources.'
fi