patch libc with ubuntu glibc debug symbol

patch_libc.sh

#!/bin/bash -ex

LIBC=$(ls * | grep -P '^(libc\.so\.6|libc-.*\.so)$')

LIBC_DBG_DEB="$(~/package/libc-database/identify $LIBC | sed s/libc6_/libc6-dbg_/g).deb"
if [[ ! -e $LIBC_DBG_DEB ]]; then
	wget http://archive.ubuntu.com/ubuntu/pool/main/g/glibc/$LIBC_DBG_DEB
fi
DEBUGID=$(file $LIBC | grep -Po '(?<=BuildID\[sha1\]=)[0-9a-f]{40}')

TEMPDIR=./deb
if [[ ! -d $TEMPDIR ]]; then
	mkdir $TEMPDIR
fi

DEBUGFILE="$(echo $DEBUGID | sed -e 's/^\(..\)//g').debug"

ar vx $LIBC_DBG_DEB --output $TEMPDIR
case "$(ls $TEMPDIR/data.* | xargs basename)" in
*data\.tar\.gz)
	SYMBOLPATH=$(tar -tvf $TEMPDIR/data.tar.gz | grep -Po "[^ ]*$DEBUGFILE.*")
	tar -C $TEMPDIR -xvf $TEMPDIR/data.tar.gz $SYMBOLPATH
	;;
*data\.tar\.zst)
	SYMBOLPATH=$(tar --use-compress-program=unzstd -tvf $TEMPDIR/data.tar.zst | grep -Po "[^ ]*$DEBUGFILE.*")
	tar --use-compress-program=unzstd -C $TEMPDIR -xvf $TEMPDIR/data.tar.zst $SYMBOLPATH
	;;
esac

cp "$TEMPDIR/$SYMBOLPATH" "./$LIBC.debug"

rm -r ./deb
rm libc6-*.deb

cp $LIBC "original_$LIBC"
objcopy --remove-section=.gnu_debuglink $LIBC
objcopy --add-gnu-debuglink="./$LIBC.debug" $LIBC