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								#!/bin/bash
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								set -uo pipefail
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								CHANGELOG_FILE="${1:-CHANGELOG.md}"
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								if [ "${NO_CHANGELOG_LABEL}" = "true" ]; then
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								    # 'no changelog' set, so finish successfully
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								    echo "\"no changelog\" label has been set"
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								    exit 0
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								else
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								    # a changelog check is required
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								    # fail if the diff is empty
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								    if git diff --exit-code "origin/${BASE_REF}" -- "${CHANGELOG_FILE}"; then
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								        >&2 echo "Changes should come with an entry in the \"CHANGELOG.md\" file. This behavior
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								can be overridden by using the \"no changelog\" label, which is used for changes
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								that are trivial / explicitly stated not to require a changelog entry."
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								        exit 1
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								    fi
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								    echo "The \"CHANGELOG.md\" file has been updated."
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								fi
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