46 lines
1 KiB
Bash
Executable file
46 lines
1 KiB
Bash
Executable file
#!/usr/bin/env bash
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set -e
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ROOT_DIRECTORY=$1
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SUBVOLUME=$2
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TARGET_SUBVOLUME="${ROOT_DIRECTORY}/${SUBVOLUME}"
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SNAPSHOT_DIRECTORY="${ROOT_DIRECTORY}/@snapshots"
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if [ "${ROOT_DIRECTORY}" == "" ]
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then
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echo "No root directory provided"
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exit 1
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fi
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if [ ! -d "${SNAPSHOT_DIRECTORY}" ]
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then
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echo "No snapshot directory in root ${ROOT_DIRECTORY}"
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exit 1
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fi
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if [ "${SUBVOLUME}" == "" ]
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then
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echo "No subvolume provided"
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exit 1
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fi
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LATEST_SNAPSHOT=$(ls ${ROOT_DIRECTORY}/@snapshots/ | grep "${SUBVOLUME}\." | awk '{ print length, $0 }' | sort | tail -n 1 | awk '{ print $2 }')
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SNAPSHOT_PATH="${SNAPSHOT_DIRECTORY}/${LATEST_SNAPSHOT}"
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if [ ! -d "${SNAPSHOT_PATH}" ] || [ "${LATEST_SNAPSHOT}" == "" ]
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then
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echo "Couldn't find latest snapshot for subvolume ${SUBVOLUME}"
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exit 1
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fi
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if [ -d "${TARGET_SUBVOLUME}" ]
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then
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echo "Removing existing subvolume"
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btrfs subvolume delete "${TARGET_SUBVOLUME}"
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fi
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echo "Snapshotting ${SNAPSHOT_PATH} into ${TARGET_SUBVOLUME}"
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btrfs subvolume snapshot "${SNAPSHOT_PATH}" "${TARGET_SUBVOLUME}"
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