Merge pull request #2 from 0ranki/dev
v0.01 Basic snapshotting with descriptions implemented.
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#!/bin/bash
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## snapsh
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## Copyright (C) 2020 Jarno Rankinen
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##
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## This program is free software: you can redistribute it and/or modify
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## it under the terms of the GNU General Public License as published by
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## the Free Software Foundation, either version 3 of the License, or
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## (at your option) any later version.
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##
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## This program is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU General Public License for more details.
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##
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## You should have received a copy of the GNU General Public License
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## along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Environment set up:
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TOPLEVEL="/root/btrfs-toplevel"
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SNAPSHOTS_LOCATION="/root/btrfs-toplevel/snapshots"
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BTRFS_EXECUTABLE=$(which btrfs)
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TIMESTAMP=$(date +%Y.%m.%d-%H:%M:%S)
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SUBVOLUME="root"
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DESCRIPTION=""
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help() {
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printf "Usage:
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snapsh [OPTIONS]
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Options:
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-h, --help Display this help message
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-d STR, --description STR Add a description for the snapshot displayed in the
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snapshots listing. Must be used before -s, e.g.
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snapsh -d "A snapshot" -s root
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-s SUBVOL, --snapshot SUBVOL Take a snapshot of subvolume named SUBVOL.
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Exit codes:
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2 - Invalid options
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3 - Target subvolume does not exist\n"
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}
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snapshot() {
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EXIT_CODE=0
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root_check
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# Check that the subvolume storing snapshots exists
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if [[ ! -d ${SNAPSHOTS_LOCATION} ]]; then
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printf "Subvolume ${SNAPSHOTS_LOCATION} does not exist. Create it now?\n"
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read -n 1 -p "y/n: "
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if [[ "${REPLY}" == "y" ]]; then
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${BTRFS_EXECUTABLE} subvolume create ${SNAPSHOTS_LOCATION}
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unset ${REPLY}
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else
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EXIT_CODE=3
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fi
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else
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printf "Creating snapshot of subvolume ${SUBVOLUME} as ${SUBVOLUME}_snapshot_${TIMESTAMP}\n"
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# Create info file for listing snapshots
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# Created first on the source subvolume, then deleted
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printf "DATE=$(date)
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SOURCE_SUBVOLUME=${SUBVOLUME}
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DESCRIPTION=${DESCRIPTION}
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TYPE=\"manual\"\n" > ${TOPLEVEL}/${SUBVOLUME}/.snapsh
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# Create readonly subvolume
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${BTRFS_EXECUTABLE} subvolume snapshot -r ${TOPLEVEL}/${SUBVOLUME} ${SNAPSHOTS_LOCATION}/${SUBVOLUME}_snapshot_${TIMESTAMP}
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# Delete info file from source
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rm -f ${TOPLEVEL}/${SUBVOLUME}/.snapsh
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printf "Snapshot created!
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${SUBVOLUME}_snapshot_${TIMESTAMP}
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DATE=$(date)
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SOURCE_SUBVOLUME=${SUBVOLUME}
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DESCRIPTION=${DESCRIPTION}
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TYPE=\"manual\"\n"
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fi
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exit ${EXIT_CODE}
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}
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# Check for root permissions
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root_check() {
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if [[ "$UID" -ne 0 ]]; then
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printf "This option needs root permission.\n"
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exit 3
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fi
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}
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# If no options are given, display help
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if [[ "$#" -eq 0 ]]; then
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help
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exit 2
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fi
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# Options parsing:
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OPTIONS=$(getopt -a -n snapsh -o hs:d: --long help,snapshot:,description: -- "$@")
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# Invalid options (getopt returns nonzero)
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if [[ "$?" -ne 0 ]]; then
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printf "Error Parsing options\n"
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help
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exit 2
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fi
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eval set -- "$OPTIONS"
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while true; do
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case "$1" in
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-h | --help)
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help
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shift
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exit 0
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;;
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-d | --description)
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DESCRIPTION="$2"
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shift 2
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;;
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-s | --snapshot)
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SUBVOLUME="$2"
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snapshot
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shift 2
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;;
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esac
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done
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