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#!/usr/bin/env bash
#
# Use this script to update libexpat
set -e
set -o pipefail
if [[ "${BASH_VERSINFO[0]}" -lt 4 ]]; then
echo "A bash version >= 4 required. Got: $BASH_VERSION" >&2
exit 1
fi
# Update this when updating to a new version after verifying that the changes
# the update brings in are good. These values are used for verifying the SBOM, too.
expected_libexpat_tag="R_2_7_1"
expected_libexpat_version="2.7.1"
expected_libexpat_sha256="0cce2e6e69b327fc607b8ff264f4b66bdf71ead55a87ffd5f3143f535f15cfa2"
expat_dir="$(realpath "$(dirname -- "${BASH_SOURCE[0]}")")"
cd ${expat_dir}
# Step 1: download and copy files
curl --location "https://github.com/libexpat/libexpat/releases/download/${expected_libexpat_tag}/expat-${expected_libexpat_version}.tar.gz" > libexpat.tar.gz
echo "${expected_libexpat_sha256} libexpat.tar.gz" | sha256sum --check
# Step 2: Pull files from the libexpat distribution
declare -a lib_files
lib_files=(
ascii.h
asciitab.h
expat.h
expat_external.h
iasciitab.h
internal.h
latin1tab.h
nametab.h
siphash.h
utf8tab.h
winconfig.h
xmlparse.c
xmlrole.c
xmlrole.h
xmltok.c
xmltok.h
xmltok_impl.c
xmltok_impl.h
xmltok_ns.c
)
for f in "${lib_files[@]}"; do
tar xzvf libexpat.tar.gz "expat-${expected_libexpat_version}/lib/${f}" --strip-components 2
done
rm libexpat.tar.gz
# Step 3: Add the namespacing include to expat_external.h
sed -i 's/#define Expat_External_INCLUDED 1/&\n\n\/* Namespace external symbols to allow multiple libexpat version to\n co-exist. \*\/\n#include "pyexpatns.h"/' expat_external.h
echo "Updated; verify all is okay using git diff and git status."
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