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#!/bin/bash
# Copyright The OpenTelemetry Authors
# SPDX-License-Identifier: Apache-2.0
set -euo pipefail
TARGET="${1:?Must provide target ref}"
FILE="CHANGELOG.md"
TEMP_DIR=$(mktemp -d)
echo "Temp folder: $TEMP_DIR"
# Only the latest commit of the feature branch is available
# automatically. To diff with the base branch, we need to
# fetch that too (and we only need its latest commit).
git fetch origin "${TARGET}" --depth=1
# Checkout the previous version on the base branch of the changelog to tmpfolder
git --work-tree="$TEMP_DIR" checkout FETCH_HEAD $FILE
PREVIOUS_FILE="$TEMP_DIR/$FILE"
CURRENT_FILE="$FILE"
PREVIOUS_LOCKED_FILE="$TEMP_DIR/previous_locked_section.md"
CURRENT_LOCKED_FILE="$TEMP_DIR/current_locked_section.md"
# Extract released sections from the previous version
awk '/^<!-- Released section -->/ {flag=1} /^<!-- Released section ended -->/ {flag=0} flag' "$PREVIOUS_FILE" > "$PREVIOUS_LOCKED_FILE"
# Extract released sections from the current version
awk '/^<!-- Released section -->/ {flag=1} /^<!-- Released section ended -->/ {flag=0} flag' "$CURRENT_FILE" > "$CURRENT_LOCKED_FILE"
# Compare the released sections
if ! diff -q "$PREVIOUS_LOCKED_FILE" "$CURRENT_LOCKED_FILE"; then
echo "Error: The released sections of the changelog file have been modified."
diff "$PREVIOUS_LOCKED_FILE" "$CURRENT_LOCKED_FILE"
rm -rf "$TEMP_DIR"
false
fi
rm -rf "$TEMP_DIR"
echo "The released sections remain unchanged."
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