2024-08-14 20:00:09 -04:00
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#!/usr/bin/env bash
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2024-08-14 19:44:00 -04:00
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# A script to perform incremental backups using rsync
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set -o errexit
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set -o nounset
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set -o pipefail
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readonly KEEP="$3"
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readonly SOURCE_DIR="$1"
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readonly BACKUP_DIR="$2"
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readonly DATETIME="$(date '+%Y-%m-%d_%H:%M:%S')"
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readonly BACKUP_PATH="${BACKUP_DIR}/${DATETIME}"
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readonly LATEST_LINK="$(dirname ${BACKUP_DIR})/latest"
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mkdir -p "${BACKUP_DIR}"
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rsync -avh --delete \
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"${SOURCE_DIR}/" \
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--link-dest "${LATEST_LINK}" \
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--exclude=".cache" \
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"${BACKUP_PATH}"
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rm -rf "${LATEST_LINK}"
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ln -s "${BACKUP_PATH}" "${LATEST_LINK}"
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COUNT=$(ls ${BACKUP_DIR} | wc -l)
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if [[ ${KEEP} -lt ${COUNT} ]]; then
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TRASH=$(ls ${BACKUP_DIR} | sort -r | tail -n $(( ${COUNT} - ${KEEP} )) )
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for t in ${TRASH}; do
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rm -rf "${BACKUP_DIR}/${t}"
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echo "REMOVED: ${BACKUP_DIR}/${t}"
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done
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fi
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