mirror of
https://github.com/ItsDrike/dotfiles.git
synced 2024-12-26 13:14:35 +00:00
Rewrite btrfs-backup script
This commit is contained in:
parent
f77786d892
commit
a473ed5cb3
GPG key ID:
FA2745890B7048C0
|
|
@ -17,17 +17,7 @@ START_HOURS_RANGE=3-22
|
||||||
|
|
||||||
@daily 15 pacman_file_db /usr/bin/pacman -Fy
|
@daily 15 pacman_file_db /usr/bin/pacman -Fy
|
||||||
|
|
||||||
@daily 10 snapshot.daily.@ /usr/local/bin/btrfs-backup /.btrfs/@ /.btrfs/@snapshots/@/daily --total 8
|
|
||||||
@daily 10 snapshot.daily.@home /usr/local/bin/btrfs-backup /.btrfs/@home /.btrfs/@snapshots/@home/daily --total 8
|
|
||||||
@daily 10 snapshot.daily.@data /usr/local/bin/btrfs-backup /.btrfs/@data /.btrfs/@snapshots/@data/daily --total 8
|
|
||||||
@daily 10 snapshot.daily.@log /usr/local/bin/btrfs-backup /.btrfs/@log /.btrfs/@snapshots/@log/daily --total 8
|
|
||||||
|
|
||||||
@weekly 20 snapshot.weekly.@ /usr/local/bin/btrfs-backup /.btrfs/@ /.btrfs/@snapshots/@/weekly --total 5
|
@daily 10 snapshot.daily /usr/local/bin/btrfs-backup -l daily -k 8 -- /.btrfs/@ /.btrfs/@home /.btrfs/@data /.btrfs/@log
|
||||||
@weekly 20 snapshot.weekly.@home /usr/local/bin/btrfs-backup /.btrfs/@home /.btrfs/@snapshots/@home/weekly --total 5
|
@weekly 20 snapshot.weekly /usr/local/bin/btrfs-backup -l weekly -k 5 -- /.btrfs/@ /.btrfs/@home /.btrfs/@data /.btrfs/@log
|
||||||
@weekly 20 snapshot.weekly.@data /usr/local/bin/btrfs-backup /.btrfs/@data /.btrfs/@snapshots/@data/weekly --total 5
|
@monthly 30 snapshot.monthly /usr/local/bin/btrfs-backup -l monthly -k 3 -- /.btrfs/@ /.btrfs/@home /.btrfs/@data /.btrfs/@log
|
||||||
@weekly 20 snapshot.weekly.@log /usr/local/bin/btrfs-backup /.btrfs/@log /.btrfs/@snapshots/@log/weekly --total 5
|
|
||||||
|
|
||||||
@monthly 30 snapshot.monthly.@ /usr/local/bin/btrfs-backup /.btrfs/@ /.btrfs/@snapshots/@/monthly --total 3
|
|
||||||
@monthly 30 snapshot.monthly.@home /usr/local/bin/btrfs-backup /.btrfs/@home /.btrfs/@snapshots/@home/monthly --total 3
|
|
||||||
@monthly 30 snapshot.monthly.@data /usr/local/bin/btrfs-backup /.btrfs/@data /.btrfs/@snapshots/@data/monthly --total 3
|
|
||||||
@monthly 30 snapshot.monthly.@log /usr/local/bin/btrfs-backup /.btrfs/@log /.btrfs/@snapshots/@log/monthly --total 3
|
|
||||||
|
|
|
||||||
|
|
@ -5,12 +5,5 @@
|
||||||
# m h dom mon dow user command
|
# m h dom mon dow user command
|
||||||
*/30 * * * * root /usr/bin/updatedb
|
*/30 * * * * root /usr/bin/updatedb
|
||||||
|
|
||||||
15,30,45 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@ /.btrfs/@snapshots/@/quaterly --total 4
|
15,30,45 * * * * root /usr/local/bin/btrfs-backup -l quaterly -k 4 -- /.btrfs/@ /.btrfs/@home /.btrfs/@data /.btrfs/@log
|
||||||
15,30,45 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@home /.btrfs/@snapshots/@home/quaterly --total 4
|
0 * * * * root /usr/local/bin/btrfs-backup -l hourly -k 8 -- /.btrfs/@ /.btrfs/@home /.btrfs/@data /.btrfs/@log
|
||||||
15,30,45 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@data /.btrfs/@snapshots/@data/quaterly --total 4
|
|
||||||
15,30,45 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@log /.btrfs/@snapshots/@log/quaterly --total 4
|
|
||||||
|
|
||||||
0 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@ /.btrfs/@snapshots/@/hourly --total 8
|
|
||||||
0 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@home /.btrfs/@snapshots/@home/hourly --total 8
|
|
||||||
0 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@data /.btrfs/@snapshots/@data/hourly --total 8
|
|
||||||
0 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@log /.btrfs/@snapshots/@log/hourly --total 8
|
|
||||||
|
|
|
||||||
|
|
@ -1,110 +1,382 @@
|
||||||
#!/bin/bash
|
#!/bin/bash
|
||||||
|
|
||||||
|
##
|
||||||
|
# btrfs-backup for Linux
|
||||||
|
# Automatically create, rotate, and destroy periodic BTRFS snapshots.
|
||||||
|
#
|
||||||
|
# Copyright 2024 ItsDrike <itsdrike@protonmail.com>
|
||||||
|
#
|
||||||
|
# This script was inspired by btrfs-auto-snapshot:
|
||||||
|
# <https://github.com/hunleyd/btrfs-auto-snapshot/blob/master/btrfs-auto-snapshot>
|
||||||
|
# Copyright 2014-2022 Doug Hunley <doug.hunley@gmail.com>
|
||||||
|
#
|
||||||
|
# This program is free software; you can redistribute it and/or modify it under
|
||||||
|
# the terms of the GNU General Public License as published by the Free Software
|
||||||
|
# Foundation; either version 2 of the License, or (at your option) any later
|
||||||
|
# version.
|
||||||
|
#
|
||||||
|
# This program is distributed in the hope that it will be useful, but WITHOUT
|
||||||
|
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
||||||
|
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
|
||||||
|
# details.
|
||||||
|
#
|
||||||
|
# You should have received a copy of the GNU General Public License along with
|
||||||
|
# this program; if not, write to the Free Software Foundation, Inc., 59 Temple
|
||||||
|
# Place, Suite 330, Boston, MA 02111-1307 USA
|
||||||
|
|
||||||
|
set -euo pipefail
|
||||||
|
|
||||||
|
VERSION="0.1.0"
|
||||||
|
DEFAULT_SNAPS_DIR="/.btrfs/@snapshots"
|
||||||
|
DEFAULT_PREFIX="backup"
|
||||||
|
DEFAULT_LABEL="adhoc"
|
||||||
|
|
||||||
|
ERR_CODE_MISSING_SYS_REQS=2
|
||||||
|
ERR_CODE_NOT_ROOT=3
|
||||||
|
ERR_CODE_GETOPT_FAILED=128
|
||||||
|
ERR_CODE_INVALID_ARG=129
|
||||||
|
ERR_CODE_INTERNAL_ERR=140
|
||||||
|
|
||||||
|
trap argsp_cmdline_exit_handler SIGUSR1
|
||||||
|
|
||||||
|
argsp_cmdline_exit=0
|
||||||
|
|
||||||
|
help=''
|
||||||
|
keep=''
|
||||||
|
label=''
|
||||||
|
prefix=''
|
||||||
|
dry_run=''
|
||||||
|
writable=''
|
||||||
|
writable=''
|
||||||
|
snapshot_directory=''
|
||||||
|
skip_create=''
|
||||||
|
paths=''
|
||||||
|
|
||||||
|
##
|
||||||
|
# Check for available necessary system requirements
|
||||||
|
#
|
||||||
|
check_sys_reqs() {
|
||||||
|
# Running as root
|
||||||
|
if [ "$EUID" -ne 0 ]; then
|
||||||
|
echo "The script must be ran as root" >&2
|
||||||
|
exit $ERR_CODE_NOT_ROOT
|
||||||
|
fi
|
||||||
|
|
||||||
|
# Bash support for associative arrays
|
||||||
|
unset assoc
|
||||||
|
# shellcheck disable=SC2034
|
||||||
|
if ! declare -A assoc 2>/dev/null; then
|
||||||
|
echo "Associative arrays not supported! At least BASH 4 is needed." >&2
|
||||||
|
exit $ERR_CODE_MISSING_SYS_REQS
|
||||||
|
fi
|
||||||
|
|
||||||
|
# TODO: Check for btrfs-tools
|
||||||
|
}
|
||||||
|
|
||||||
usage() {
|
usage() {
|
||||||
cat <<EOF
|
echo "$0 $VERSION"
|
||||||
Create a btrfs snapshot
|
echo
|
||||||
|
echo "Usage: $0 [options] <subvolume> [subvolume...]
|
||||||
Usage btrfs-backup <subvolume> <backup_dir> [options]
|
|
||||||
|
|
||||||
Will create a snapshot of given subvolume in given backup_dir.
|
|
||||||
|
|
||||||
Options:
|
Options:
|
||||||
-h | --help: Display this message
|
-h, --help Print this usage message.
|
||||||
-t | --total: Total amount of allowed backups in the same backup_dir
|
-k, --keep=NUM Keep up to NUM most recent snapshots with this label, deleting all older ones (no snapshots will be deleted by default)
|
||||||
-n | --name: Name of the snapshot (appended after date)
|
-l, --label=LAB LAB is usually 'hourly', 'daily', or 'monthly', default: '$DEFAULT_LABEL'
|
||||||
|
-p, --prefix=PRE PRE is '$DEFAULT_PREFIX' by default
|
||||||
|
-n, --dry-run Print actions without actually executing them
|
||||||
|
-w, --writable Create writable snapshots, instead of read-only
|
||||||
|
-d, --snapshot-directory=DIR DIR is a directory to create snapshots in, default: $DEFAULT_SNAPS_DIR
|
||||||
|
-s, --skip-create Don't create a new snapshot (only useful with --keep to clean existing snapshots)
|
||||||
|
|
||||||
Example for crontab (/etc/crontab):
|
Positional arguments:
|
||||||
15,30,45 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@ /.btrfs/@snapshots/@/quaterly --total 4
|
subvolume Path(s) to a mounted subvolume directory (like: '/.btrfs/@')
|
||||||
15,30,45 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@home /.btrfs/@snapshots/@home/quaterly --total 4
|
|
||||||
15,30,45 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@data /.btrfs/@snapshots/@data/quaterly --total 4
|
|
||||||
15,30,45 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@log /.btrfs/@snapshots/@log/quaterly --total 4
|
|
||||||
|
|
||||||
0 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@ /.btrfs/@snapshots/@/hourly --total 8
|
Details:
|
||||||
0 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@home /.btrfs/@snapshots/@home/hourly --total 8
|
A backup snapshot of each specified subvolume will be created in: <DIR>/<subvolume name>/<PRE>_<LAB>_<datetime>.
|
||||||
0 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@data /.btrfs/@snapshots/@data/hourly --total 8
|
The <subvolume name> will be obtained automatically, from the given subvolume paths.
|
||||||
0 * * * * root /usr/local/bin/btrfs-backup /.btrfs/@log /.btrfs/@snapshots/@log/hourly --total 8
|
The <datetime> will contain the output from 'date +%F-%H%M' command.
|
||||||
|
"
|
||||||
Example for Anacrontab (/etc/anacrontab):
|
|
||||||
@daily 10 snapshot.daily.@ /usr/local/bin/btrfs-backup /.btrfs/@ /.btrfs/@snapshots/@/daily --total 8
|
|
||||||
@daily 10 snapshot.daily.@home /usr/local/bin/btrfs-backup /.btrfs/@home /.btrfs/@snapshots/@home/daily --total 8
|
|
||||||
@daily 10 snapshot.daily.@data /usr/local/bin/btrfs-backup /.btrfs/@data /.btrfs/@snapshots/@data/daily --total 8
|
|
||||||
@daily 10 snapshot.daily.@log /usr/local/bin/btrfs-backup /.btrfs/@log /.btrfs/@snapshots/@log/daily --total 8
|
|
||||||
|
|
||||||
@weekly 20 snapshot.weekly.@ /usr/local/bin/btrfs-backup /.btrfs/@ /.btrfs/@snapshots/@/weekly --total 5
|
|
||||||
@weekly 20 snapshot.weekly.@home /usr/local/bin/btrfs-backup /.btrfs/@home /.btrfs/@snapshots/@home/weekly --total 5
|
|
||||||
@weekly 20 snapshot.weekly.@data /usr/local/bin/btrfs-backup /.btrfs/@data /.btrfs/@snapshots/@data/weekly --total 5
|
|
||||||
@weekly 20 snapshot.weekly.@log /usr/local/bin/btrfs-backup /.btrfs/@log /.btrfs/@snapshots/@log/weekly --total 5
|
|
||||||
|
|
||||||
@monthly 30 snapshot.monthly.@ /usr/local/bin/btrfs-backup /.btrfs/@ /.btrfs/@snapshots/@/monthly --total 3
|
|
||||||
@monthly 30 snapshot.monthly.@home /usr/local/bin/btrfs-backup /.btrfs/@home /.btrfs/@snapshots/@home/monthly --total 3
|
|
||||||
@monthly 30 snapshot.monthly.@data /usr/local/bin/btrfs-backup /.btrfs/@data /.btrfs/@snapshots/@data/monthly --total 3
|
|
||||||
@monthly 30 snapshot.monthly.@log /usr/local/bin/btrfs-backup /.btrfs/@log /.btrfs/@snapshots/@log/monthly --total 3
|
|
||||||
EOF
|
|
||||||
}
|
}
|
||||||
|
|
||||||
backup() {
|
##
|
||||||
local now="$(date '+%Y_%M_%dT%H_%M_%S')"
|
# Parse and set command line arguments, possible aborting in case of errors or missing
|
||||||
local name="$now"
|
# required arguments.
|
||||||
if [[ "$SNAPSHOT_NAME" ]]; then
|
#
|
||||||
name="$name-$SNAPSHOT_NAME"
|
# @param[in] Callers need to forward (@code $@)!
|
||||||
fi
|
# return Associative array with all options and passed paths
|
||||||
btrfs subvolume snapshot -r "$SUBVOLUME" "$BACKUP_DIR/$name"
|
#
|
||||||
|
argsp_cmdline() {
|
||||||
|
argsp_cmdline_exit="$ERR_CODE_GETOPT_FAILED"
|
||||||
|
getopt=$(getopt \
|
||||||
|
--longoptions=help,keep:,label:,prefix:,dry-run,writable,date-format:,snapshot-directory:,skip-create \
|
||||||
|
--options=h,k:,l:,p:,n,w,f:,d:,s \
|
||||||
|
-- "$@") ||
|
||||||
|
kill -SIGUSR1 $$
|
||||||
|
eval set -- "${getopt}"
|
||||||
|
|
||||||
# Clean up older snapshots
|
declare -A ret_val
|
||||||
if [[ "$TOTAL_BACKUPS" -ne 0 ]]; then
|
|
||||||
for i in $(find "$BACKUP_DIR" -maxdepth 1 | sort | head -n -"${TOTAL_BACKUPS}"); do
|
|
||||||
btrfs subvolume delete "$i"
|
|
||||||
done
|
|
||||||
fi
|
|
||||||
}
|
|
||||||
|
|
||||||
# Extract the last two arguments
|
ret_val[help]='0'
|
||||||
SUBVOLUME="$1"
|
ret_val[keep]=''
|
||||||
BACKUP_DIR="$2"
|
ret_val[label]="$DEFAULT_LABEL"
|
||||||
shift
|
ret_val[prefix]="$DEFAULT_PREFIX"
|
||||||
shift
|
ret_val[dry_run]=''
|
||||||
|
ret_val[writable]='-r'
|
||||||
|
ret_val[snapshot_directory]="$DEFAULT_SNAPS_DIR"
|
||||||
|
ret_val[skip_create]='0'
|
||||||
|
ret_val[paths]=''
|
||||||
|
|
||||||
if [[ -z "$SUBVOLUME" || -z "$BACKUP_DIR" ]]; then
|
while [ $# -gt 0 ]; do
|
||||||
echo "Error: Both subvolume and backup_dir must be provided."
|
|
||||||
usage
|
|
||||||
exit 1
|
|
||||||
fi
|
|
||||||
|
|
||||||
if [[ ! -d "$SUBVOLUME" ]]; then
|
|
||||||
echo "Error: Specified subvolume path isn't a valid directory."
|
|
||||||
exit 1
|
|
||||||
fi
|
|
||||||
|
|
||||||
if [[ ! -d "$BACKUP_DIR" ]]; then
|
|
||||||
echo "Error: Specified backup directory path isn't a valid directory."
|
|
||||||
exit 1
|
|
||||||
fi
|
|
||||||
|
|
||||||
TOTAL_BACKUPS=0
|
|
||||||
SNAPSHOT_NAME=""
|
|
||||||
|
|
||||||
while [[ "$1" ]]; do
|
|
||||||
case "$1" in
|
case "$1" in
|
||||||
-h | --help)
|
-h | --help)
|
||||||
usage
|
ret_val[help]=1
|
||||||
exit 0
|
shift 1
|
||||||
;;
|
;;
|
||||||
-t | --total)
|
-k | --keep)
|
||||||
shift
|
if ! test "$2" -ge 0 2>/dev/null; then
|
||||||
TOTAL_BACKUPS="$1"
|
echo "The $1 parameter must be a non-negative integer, got: $2" >&2
|
||||||
shift
|
argsp_cmdline_exit="$ERR_CODE_INVALID_ARG"
|
||||||
|
kill -SIGUSR1 $$
|
||||||
|
fi
|
||||||
|
|
||||||
|
ret_val[keep]=$2
|
||||||
|
shift 2
|
||||||
;;
|
;;
|
||||||
-n | --name)
|
-l | --label)
|
||||||
shift
|
label="$2"
|
||||||
SNAPSHOT_NAME="$1"
|
case $label in
|
||||||
shift
|
[![:alnum:]_.:\ -]*)
|
||||||
|
echo "The $1 parameter must be alphanumeric." >&2
|
||||||
|
argsp_cmdline_exit="$ERR_CODE_INVALID_ARG"
|
||||||
|
kill -SIGUSR1 $$
|
||||||
;;
|
;;
|
||||||
*)
|
esac
|
||||||
echo "Error: Unknown argument: $1"
|
|
||||||
usage
|
ret_val[label]="$label"
|
||||||
exit 1
|
shift 2
|
||||||
|
;;
|
||||||
|
-p | --prefix)
|
||||||
|
prefix="$2"
|
||||||
|
|
||||||
|
case $prefix in
|
||||||
|
[![:alnum:]_.:\ -]*)
|
||||||
|
echo "The $1 parameter must be alphanumeric." >&2
|
||||||
|
argsp_cmdline_exit="$ERR_CODE_INVALID_ARG"
|
||||||
|
kill -SIGUSR1 $$
|
||||||
|
;;
|
||||||
|
esac
|
||||||
|
|
||||||
|
ret_val[prefix]="$prefix"
|
||||||
|
shift 2
|
||||||
|
;;
|
||||||
|
-n | --dry-run)
|
||||||
|
ret_val[dry_run]='echo'
|
||||||
|
echo "Doing a dry run. Not running these commands..." >&2
|
||||||
|
shift 1
|
||||||
|
;;
|
||||||
|
-w | --writable)
|
||||||
|
ret_val[writable]=''
|
||||||
|
shift 1
|
||||||
|
;;
|
||||||
|
-d | --snapshot-directory)
|
||||||
|
directory="$2"
|
||||||
|
if ! test -d "$directory" 2>/dev/null; then
|
||||||
|
echo "Invalid snapshots directory (must be an existing directory)" >&2
|
||||||
|
argsp_cmdline_exit="$ERR_CODE_INVALID_ARG"
|
||||||
|
kill -SIGUSR1 $$
|
||||||
|
fi
|
||||||
|
ret_val[snapshot_directory]="$directory"
|
||||||
|
shift 2
|
||||||
|
;;
|
||||||
|
-s | --skip-create)
|
||||||
|
ret_val[skip_create]=1
|
||||||
|
shift 1
|
||||||
|
;;
|
||||||
|
--)
|
||||||
|
shift 1
|
||||||
|
break
|
||||||
;;
|
;;
|
||||||
esac
|
esac
|
||||||
done
|
done
|
||||||
|
|
||||||
backup
|
if [ $# -eq 0 ]; then
|
||||||
|
if [ "${ret_val[help]}" -eq 0 ]; then
|
||||||
|
echo "No subvolume path(s) specified." >&2
|
||||||
|
echo "See $0 --help." >&2
|
||||||
|
argsp_cmdline_exit="$ERR_CODE_INVALID_ARG"
|
||||||
|
kill -SIGUSR1 $$
|
||||||
|
fi
|
||||||
|
fi
|
||||||
|
|
||||||
|
if [ "${ret_val[keep]}" -eq 0 ] && [ "${ret_val[skip_create]}" -eq 0 ]; then
|
||||||
|
echo "Using --keep=0 doesn't make sense without --skip-create." >&2
|
||||||
|
echo "It would delete the new snapshot you wanted to create." >&2
|
||||||
|
argsp_cmdline_exit="$ERR_CODE_INVALID_ARG"
|
||||||
|
kill -SIGUSR1 $$
|
||||||
|
fi
|
||||||
|
|
||||||
|
ret_val[paths]="$*"
|
||||||
|
|
||||||
|
# Decrease keep by one if set during dry-run, since the snapshots won't
|
||||||
|
# actually be created, so there would be 1 extra snapshot in reality.
|
||||||
|
if [ -n "${ret_val[dry_run]}" ] && [ -n "${ret_val[keep]}" ] && [ "${ret_val[skip_create]}" -eq 0 ]; then
|
||||||
|
keep="${ret_val[keep]}"
|
||||||
|
ret_val[keep]=$((keep - 1))
|
||||||
|
fi
|
||||||
|
|
||||||
|
# Print the declaration of ret_val, removing the declaration part
|
||||||
|
declare -p ret_val | sed -e 's/^declare -A [^=]*=//'
|
||||||
|
}
|
||||||
|
|
||||||
|
##
|
||||||
|
# Exit with the code stored in {@code argsp_cmdline_exit}.
|
||||||
|
#
|
||||||
|
# The corresponding parser function needs to be called as a subshell to be able to process
|
||||||
|
# the returned list of paths to work with. So exit within that function doesn't work
|
||||||
|
# easily, which is worked around by using a special global variable and {@code kill} with
|
||||||
|
# {@code trap}.
|
||||||
|
#
|
||||||
|
argsp_cmdline_exit_handler() {
|
||||||
|
exit "$argsp_cmdline_exit"
|
||||||
|
}
|
||||||
|
|
||||||
|
##
|
||||||
|
# Get the name of the subvolume from a file-system path
|
||||||
|
#
|
||||||
|
# @param[in] Subvolume path on the file-system
|
||||||
|
#
|
||||||
|
btrfs_subvol_name() {
|
||||||
|
local -r subvolume_path="$1"
|
||||||
|
|
||||||
|
local subvol_status
|
||||||
|
local subvol_status_code
|
||||||
|
local subvol_name
|
||||||
|
subvol_status="$(btrfs subvolume show "$subvolume_path")"
|
||||||
|
subvol_status_code="$?"
|
||||||
|
if [ "$subvol_status_code" -ne 0 ]; then
|
||||||
|
echo "Btrfs subvolume show command exitted with non-zero code: $subvol_status_code." >&2
|
||||||
|
echo "Captured output:" >&2
|
||||||
|
echo "$subvol_status" >&2
|
||||||
|
echo "-----------------------" >&2
|
||||||
|
echo "This is likely due to an invalid subvolume path: $subvolume_path" >&2
|
||||||
|
argsp_cmdline_exit="$ERR_CODE_INTERNAL_ERR"
|
||||||
|
kill -SIGUSR1 $$
|
||||||
|
fi
|
||||||
|
|
||||||
|
echo "$subvol_status" | awk '/^[[:space:]]Name:/ {print $NF}'
|
||||||
|
}
|
||||||
|
|
||||||
|
##
|
||||||
|
# Create a snapshot of given subvolume.
|
||||||
|
#
|
||||||
|
# This will create a new BTRFS snapshot stored in {@code snapshot_directory/subvol_name}.
|
||||||
|
# The subvolume name will be obtained using {@code btrfs subvol status}, exitting if the
|
||||||
|
# command fails (most likely since subvolume at the given path doesn't exist).
|
||||||
|
#
|
||||||
|
# @param[in] Subvolume path on the file-system
|
||||||
|
# @params[in] Snapshot file name to be created (<PRE>_<LAB>_<DATE>)
|
||||||
|
#
|
||||||
|
btrfs_take_snapshot() {
|
||||||
|
local -r subvolume_path="$1"
|
||||||
|
local -r snap_file_name="$2"
|
||||||
|
|
||||||
|
local subvol_name
|
||||||
|
local full_dir
|
||||||
|
local snap_path
|
||||||
|
local -a snap_opts=()
|
||||||
|
|
||||||
|
subvol_name="$(btrfs_subvol_name "$subvolume_path")"
|
||||||
|
|
||||||
|
# Make sure the snapshot directory exists
|
||||||
|
full_dir="$snapshot_directory/$subvol_name"
|
||||||
|
if [ ! -d "$full_dir" ]; then
|
||||||
|
${dry_run} mkdir -p "$full_dir"
|
||||||
|
fi
|
||||||
|
|
||||||
|
snap_path="$full_dir/$snap_file_name"
|
||||||
|
snap_opts=("$writable" "$subvolume_path" "$snap_path")
|
||||||
|
|
||||||
|
if ! ${dry_run} btrfs subvolume snapshot "${snap_opts[@]}"; then
|
||||||
|
echo "Btrfs subvolume snapshot command failed!" >&2
|
||||||
|
argsp_cmdline_exit="$ERR_CODE_INTERNAL_ERR"
|
||||||
|
kill -SIGUSR1 $$
|
||||||
|
fi
|
||||||
|
}
|
||||||
|
|
||||||
|
##
|
||||||
|
# Cleanup old snapshots, only keeping up to {@code keep} total snapshots.
|
||||||
|
#
|
||||||
|
# If {@code keep} isn't specified, no snapshots will be removed.
|
||||||
|
#
|
||||||
|
# @param[in] Subvolume path on the file-system
|
||||||
|
# @param[in] Pattern to find the snapshot names for the current prefix and label.
|
||||||
|
#
|
||||||
|
btrfs_clean_snapshots() {
|
||||||
|
local -r subvolume_path="$1"
|
||||||
|
local -r snap_patt="$2"
|
||||||
|
|
||||||
|
if [ -z "$keep" ]; then
|
||||||
|
return
|
||||||
|
fi
|
||||||
|
|
||||||
|
local subvol_name
|
||||||
|
local full_dir
|
||||||
|
local full_dir_escaped
|
||||||
|
local snaps
|
||||||
|
local paths
|
||||||
|
|
||||||
|
subvol_name="$(btrfs_subvol_name "$subvolume_path")"
|
||||||
|
full_dir="$snapshot_directory/$subvol_name"
|
||||||
|
full_dir_escaped=$(echo "${full_dir}" | sed 's/[\#]/\\&/g')
|
||||||
|
|
||||||
|
if [ ! -d "$full_dir" ] && [ -n "$dry_run" ]; then
|
||||||
|
echo "Ignoring cleanup in dry-run, $full_dir doesn't exist" >&2
|
||||||
|
return
|
||||||
|
fi
|
||||||
|
|
||||||
|
snaps="$(find "$full_dir" -maxdepth 1 -mindepth 1 -type d | sort)"
|
||||||
|
snaps="$(echo "${snaps}" | sed -r "\#${full_dir_escaped}/${snap_patt}#!d")"
|
||||||
|
snaps="$(echo "$snaps" | head -n "-$keep")"
|
||||||
|
|
||||||
|
while IFS= read -r i; do
|
||||||
|
if [ -z "$i" ]; then
|
||||||
|
continue
|
||||||
|
fi
|
||||||
|
|
||||||
|
${dry_run} btrfs subvolume delete "$i"
|
||||||
|
done <<<"$snaps"
|
||||||
|
}
|
||||||
|
|
||||||
|
check_sys_reqs
|
||||||
|
|
||||||
|
cmdline="$(argsp_cmdline "$@")"
|
||||||
|
eval "declare -A cmdline=${cmdline}"
|
||||||
|
|
||||||
|
help="${cmdline[help]}"
|
||||||
|
keep="${cmdline[keep]}"
|
||||||
|
label="${cmdline[label]}"
|
||||||
|
prefix="${cmdline[prefix]}"
|
||||||
|
dry_run="${cmdline[dry_run]}"
|
||||||
|
writable="${cmdline[writable]}"
|
||||||
|
writable="${cmdline[writable]}"
|
||||||
|
snapshot_directory="${cmdline[snapshot_directory]}"
|
||||||
|
skip_create="${cmdline[skip_create]}"
|
||||||
|
paths="${cmdline[paths]}"
|
||||||
|
|
||||||
|
if [ "$help" -eq 1 ]; then
|
||||||
|
usage
|
||||||
|
exit 0
|
||||||
|
fi
|
||||||
|
|
||||||
|
snap_name="${prefix}_${label}_$(date +%F-%H%M)"
|
||||||
|
|
||||||
|
# Used for sorting the snapshots later on
|
||||||
|
date_patt='[[:digit:]]{4}-[[:digit:]]{2}-[[:digit:]]{2}-[[:digit:]]{4}'
|
||||||
|
snap_patt="${prefix}_${label}_${date_patt}"
|
||||||
|
|
||||||
|
for i in $paths; do
|
||||||
|
if [ "$skip_create" -eq 0 ]; then
|
||||||
|
btrfs_take_snapshot "$i" "$snap_name"
|
||||||
|
fi
|
||||||
|
btrfs_clean_snapshots "$i" "$snap_patt"
|
||||||
|
done
|
||||||
|
|
|
||||||
Loading…
Reference in a new issue