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#!/usr/bin/env bash
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set -eo pipefail
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[[ -z "${BACKUP_DIR}" ]] && echo "Required 'BACKUP_DIR' env not set" && exit 1
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latest=$(find ${BACKUP_DIR} -name '*.tar.gz' -exec basename {} \; | sort -g | tail -n 1)
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if [[ "${latest}" == "" ]]; then
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echo "-1"
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else
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echo "${latest%%.*}"
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fi
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