345 lines
10 KiB
Bash
Executable File
345 lines
10 KiB
Bash
Executable File
#!/bin/bash
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# James W. Barnett
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# Takes snapshots of each snapper configuration. It then sends the snapshot to
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# a location on an external drive. After the initial transfer, it does
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# incremental snapshots on later calls. It's important not to delete the
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# snapshot created on your system since that will be used to determine the
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# difference for the next incremental snapshot.
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version="0.3"
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name="snap-sync"
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TMPDIR=$(mktemp -d)
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PIPE=$TMPDIR/$name.out
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mkfifo $PIPE
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systemd-cat -t "$name" < $PIPE &
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exec 3>$PIPE
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notify_info() {
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for u in $(users); do
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sudo -u $u DISPLAY=:0 \
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DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/$(sudo -u $u id -u)/bus \
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notify-send -a $name "$1" "$2" --icon=dialog-information
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done
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}
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notify_error() {
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for u in $(users); do
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sudo -u $u DISPLAY=:0 \
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DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/$(sudo -u $u id -u)/bus \
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notify-send -a $name "$1" "$2" --icon=dialog-error
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done
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}
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out() {
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printf "$1 $2\n" "${@:3}" | tee $PIPE
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}
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error() {
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out "==> ERROR:" "$@"
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notify_error 'Error' 'Check journal for more information.'
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} >&2
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die() {
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error "$@"
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exit 1
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}
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sigkill() {
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die "Exited due to user intervention."
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}
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[[ $EUID -ne 0 ]] && die "Script must be run as root."
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usage() {
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cat <<EOF
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$name $version
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Usage: $name [options]
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Options:
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-d, --description <desc> Change the snapper description. Default: "latest incremental backup"
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-c, --config <config> Specify the snapper configuration to use. Otherwise will perform for each snapper
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configuration. Can list multiple configurations within quotes, space-separated
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(e.g. -c "root home").
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-n, --noconfirm Do not ask for confirmation for each configuration. Will still prompt for backup
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directory name on first backup"
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-u, --UUID <UUID> Specify the UUID of the mounted BTRFS subvolume to back up to. Otherwise will prompt."
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If multiple mount points are found with the same UUID, will prompt user."
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EOF
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}
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trap error ERR
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trap sigkill SIGTERM SIGINT
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while [[ $# -gt 0 ]]; do
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key="$1"
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case $key in
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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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-c|--config)
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selected_configs="$2"
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shift 2
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;;
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-u|--UUID)
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uuid_cmdline="$2"
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shift 2
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;;
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-n|--noconfirm)
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noconfirm="yes"
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shift
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;;
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-h|--help)
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usage
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exit 1
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;;
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*)
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die "Unknown option: $key\nRun '$name -h' for valid options.\n"
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;;
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esac
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done
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description=${description:-"latest incremental backup"}
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uuid_cmdline=${uuid_cmdline:-"none"}
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noconfirm=${noconfirm:-"no"}
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if [[ "$uuid_cmdline" != "none" ]]; then
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notify_info "Backup started" "Starting backups to $uuid_cmdline..."
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else
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notify_info "Backup started" "Starting backups. Use command line menu to select disk."
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fi
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TARGETS="$(findmnt -n -v -t btrfs -o TARGET --list)"
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UUIDS="$(findmnt -n -v -t btrfs -o UUID --list)"
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declare -a TARGETS_ARRAY
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declare -a UUIDS_ARRAY
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i=0
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disk=-1
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disk_count=0
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for x in $UUIDS; do
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UUIDS_ARRAY[$i]=$x
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if [[ "$x" == "$uuid_cmdline" ]]; then
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disk=$i
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disk_count=$(($disk_count+1))
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fi
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i=$((i+1))
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done
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i=0
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for x in $TARGETS; do
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TARGETS_ARRAY[$i]=$x
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i=$((i+1))
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done
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if [[ "$disk_count" > 1 ]]; then
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printf "Multiple mount points were found with UUID $uuid_cmdline.\n"
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disk="-1"
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fi
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if [[ "$disk" == -1 ]]; then
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if [[ "$disk_count" == 0 && "$uuid_cmdline" != "none" ]]; then
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error "A device with UUID $uuid_cmdline was not found to be mounted, or it is not a BTRFS device."
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fi
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printf "Select a mounted BTRFS device to backup to.\n"
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while [[ $disk -lt 0 || $disk -gt $i ]]; do
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for x in "${!TARGETS_ARRAY[@]}"; do
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printf "%4s) %s (%s)\n" "$((x+1))" "${UUIDS_ARRAY[$x]}" "${TARGETS_ARRAY[$x]}"
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done
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printf "%4s) Exit\n" "0"
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read -r -p "Enter a number: " disk
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done
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if [[ $disk == 0 ]]; then
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exit 0
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fi
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disk=$(($disk-1))
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fi
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selected_uuid="${UUIDS_ARRAY[$((disk))]}"
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selected_mnt="${TARGETS_ARRAY[$((disk))]}"
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printf "\nYou selected the disk with UUID %s.\n" "$selected_uuid" | tee $PIPE
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printf "The disk is mounted at %s.\n" "$selected_mnt" | tee $PIPE
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if [[ -f /etc/conf.d/snapper ]]; then
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source /etc/conf.d/snapper
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else
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die "/etc/conf.d/snapper does not exist!"
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fi
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selected_configs=${selected_configs:-$SNAPPER_CONFIGS}
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declare -a BACKUPDIRS_ARRAY
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declare -a MYBACKUPDIR_ARRAY
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declare -a OLD_NUM_ARRAY
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declare -a OLD_SNAP_ARRAY
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declare -a NEW_NUM_ARRAY
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declare -a NEW_SNAP_ARRAY
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declare -a NEW_INFO_ARRAY
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declare -a BACKUPLOC_ARRAY
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declare -a CONT_BACKUP_ARRAY
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printf "\nInitial configuration...\n" | tee $PIPE
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# Initial configuration of where backup directories are
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i=0
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for x in $selected_configs; do
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if [[ "$(sudo snapper -c $x list -t single | awk '/'$name' backup in progress/ {cnt++} END {print cnt}')" -gt 0 ]]; then
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printf "\nNOTE: Previous failed $name backup snapshots found for '$x'.\n" | tee $PIPE
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fi
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SNAP_SYNC_EXCLUDE=no
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if [[ -f "/etc/snapper/configs/$x" ]]; then
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source /etc/snapper/configs/$x
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else
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die "Selected snapper configuration $x does not exist."
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fi
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if [[ $SNAP_SYNC_EXCLUDE == "yes" ]]; then
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continue
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fi
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printf "\n"
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old_num=$(snapper -c "$x" list -t single | awk '/'"$selected_uuid"'/ {print $1}')
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old_snap=$SUBVOLUME/.snapshots/$old_num/snapshot
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OLD_NUM_ARRAY[$i]=$old_num
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OLD_SNAP_ARRAY[$i]=$old_snap
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if [[ -z "$old_num" ]]; then
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printf "No backups have been performed for '%s' on this disk.\n" "$x"
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read -r -p "Enter name of directory to store backups, relative to $selected_mnt (to be created if not existing): " mybackupdir
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printf "This will be the initial backup for snapper configuration '%s' to this disk. This could take awhile.\n" "$x"
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BACKUPDIR="$selected_mnt/$mybackupdir"
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mkdir -p -m700 "$BACKUPDIR"
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else
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mybackupdir=$(snapper -c root list -t single | awk -F"|" '/'"$selected_uuid"'/ {print $5}' | awk -F "," '/backupdir/ {print $1}' | awk -F"=" '{print $2}')
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BACKUPDIR="$selected_mnt/$mybackupdir"
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if [[ ! -d $BACKUPDIR ]]; then
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die "%s is not a directory on %s.\n" "$BACKUPDIR" "$selected_uuid"
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fi
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fi
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BACKUPDIRS_ARRAY[$i]="$BACKUPDIR"
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MYBACKUPDIR_ARRAY[$i]="$mybackupdir"
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printf "Creating new snapshot for $x...\n" | tee $PIPE
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new_num=$(snapper -c "$x" create --print-number -d "$name backup in progress")
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new_snap=$SUBVOLUME/.snapshots/$new_num/snapshot
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new_info=$SUBVOLUME/.snapshots/$new_num/info.xml
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sync
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backup_location=$BACKUPDIR/$x/$new_num/
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printf "Will backup %s to %s\n" "$new_snap" "$backup_location/snapshot" | tee $PIPE
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NEW_NUM_ARRAY[$i]="$new_num"
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NEW_SNAP_ARRAY[$i]="$new_snap"
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NEW_INFO_ARRAY[$i]="$new_info"
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BACKUPLOC_ARRAY[$i]="$backup_location"
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cont_backup="K"
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CONT_BACKUP_ARRAY[$i]="yes"
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if [[ $noconfirm == "yes" ]]; then
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cont_backup="yes"
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else
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while [[ -n "$cont_backup" && "$cont_backup" != [Yy]"es" &&
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"$cont_backup" != [Yy] && "$cont_backup" != [Nn]"o" &&
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"$cont_backup" != [Nn] ]]; do
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read -r -p "Continue with backup [Y/n]? " cont_backup
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if [[ -n "$cont_backup" && "$cont_backup" != [Yy]"es" &&
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"$cont_backup" != [Yy] && "$cont_backup" != [Nn]"o" &&
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"$cont_backup" != [Nn] ]]; then
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printf "Select 'Y' or 'n'.\n"
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fi
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done
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fi
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if [[ "$cont_backup" != [Yy]"es" && "$cont_backup" != [Yy] && -n "$cont_backup" ]]; then
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CONT_BACKUP_ARRAY[$i]="no"
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printf "Aborting backup for this configuration.\n"
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snapper -c $x delete $new_num
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fi
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i=$(($i+1))
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done
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# Actual backing up
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printf "\nPerforming backups...\n" | tee $PIPE
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i=-1
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for x in $selected_configs; do
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i=$(($i+1))
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SNAP_SYNC_EXCLUDE=no
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if [[ -f "/etc/snapper/configs/$x" ]]; then
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source /etc/snapper/configs/$x
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die "Selected snapper configuration $x does not exist."
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fi
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cont_backup=${CONT_BACKUP_ARRAY[$i]}
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if [[ $cont_backup == "no" || $SNAP_SYNC_EXCLUDE == "yes" ]]; then
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notify_info "Backup in progress" "NOTE: Skipping $x configuration."
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continue
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fi
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notify_info "Backup in progress" "Backing up $x configuration."
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printf "\n"
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old_num="${OLD_NUM_ARRAY[$i]}"
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old_snap="${OLD_SNAP_ARRAY[$i]}"
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BACKUPDIR="${BACKUPDIRS_ARRAY[$i]}"
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mybackupdir="${MYBACKUPDIR_ARRAY[$i]}"
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new_num="${NEW_NUM_ARRAY[$i]}"
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new_snap="${NEW_SNAP_ARRAY[$i]}"
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new_info="${NEW_INFO_ARRAY[$i]}"
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backup_location="${BACKUPLOC_ARRAY[$i]}"
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mkdir -p "$backup_location"
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if [[ -z "$old_num" ]]; then
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printf "Sending first snapshot for %s...\n" "$x" | tee $PIPE
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btrfs send "$new_snap" | btrfs receive "$backup_location" &>/dev/null
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else
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printf "Sending incremental snapshot for %s...\n" "$x" | tee $PIPE
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# Sends the difference between the new snapshot and old snapshot to the
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# backup location. Using the -c flag instead of -p tells it that there
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# is an identical subvolume to the old snapshot at the receiving
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# location where it can get its data. This helps speed up the transfer.
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btrfs send "$new_snap" -c "$old_snap" | btrfs receive "$backup_location" &>/dev/null
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printf "Deleting old snapshot for $x...\n" | tee $PIPE
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snapper -c "$x" delete "$old_num"
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fi
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cp "$new_info" "$backup_location"
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# It's important not to change this userdata in the snapshots, since that's how
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# we find the previous one.
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userdata="backupdir=$mybackupdir, uuid=$selected_uuid"
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# Tag new snapshot as the latest
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printf "Tagging new snapshot as latest backup for $x...\n" | tee $PIPE
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snapper -v -c "$x" modify -d "$description" -u "$userdata" "$new_num"
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printf "Backup complete for configuration %s.\n" "$x" > $PIPE
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done
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printf "\nDone!\n" | tee $PIPE
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exec 3>&-
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if [[ "$uuid_cmdline" != "none" ]]; then
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notify_info "Finished" "Backups to $uuid_cmdline complete!"
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else
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notify_info "Finished" "Backups complete!"
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fi
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