-#!/bin/bash -l
+#!/bin/bash
+# Copyright (C) 2016 Ian Kelling
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+# http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+# todo: remove old leaf subvols, like keep up to 1 month or something.
set -eE -o pipefail
trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
exit $1
}
+script_dir=$(dirname $(readlink -f "$BASH_SOURCE"))
+
+# note q is owned by root:1000
+# note p/m is owned 1000:1000 and chmod 700
+
+
+mountpoints=()
+
+rsync_mountpoint=/q
+
conf_only=false
dry_run=false # mostly for testing
+resume_arg=
+rate_limit=no
+verbose=false
-temp=$(getopt -l help,long-opt hcnt "$@") || usage 1
+default_args_file=/etc/btrbk-run.conf
+if [[ -s $default_args_file ]]; then
+ set -- $(< $default_args_file) "$@"
+fi
+
+temp=$(getopt -l help cl:m:nprt:vh "$@") || usage 1
eval set -- "$temp"
while true; do
case $1 in
+ # only creates the config file, does not run btrbk
-c) conf_only=true; shift ;;
+ -l) rate_limit=$2; shift 2 ;;
+ -m) IFS=, mountpoints=($2); unset IFS; shift 2 ;;
-n) dry_run=true; dry_run_arg=-n; shift ;;
- -t) IFS=, targets=($2); shift 2 ;;
+ -p) progress_arg="--progress"; shift ;;
+ # btrbk arg: Resume only. Skips snapshot creation.
+ -r) resume_arg=-r; shift ;;
+ # empty is valid for just doing local snapshot. we have default hosts
+ # we will populate
+ -t) IFS=, targets=($2); unset IFS; shift 2 ;;
+ -v) verbose=true; verbose_arg=-v; shift ;;
-h|--help) usage ;;
--) shift; break ;;
*) echo "$0: Internal error!" ; exit 1 ;;
esac
done
-read primary <<<"$@"
-##### end command line parsing ########
-
-sed="sed -r --follow-symlinks"
-last_snaps=()
+if [[ -s $default_args_file ]]; then
+ echo "$0: warning: default btrbk-run options set in $default_args_file (sleeping 5 seconds):"
+ cat $default_args_file
+ sleep 5
+fi
-target-section() {
- local root=$1
- local subvol=$2
- mountpoint $root &>/dev/null || return
- cat >>/etc/btrbk.conf <<EOF
-volume $root
-subvolume $subvol
-$remote_target
+echo -e "$0: options: conf_only=$conf_only\ndry_run=$dry_run\nresume_arg=$resume_arg\nrate_limit=$rate_limit\nverbose=$verbose"
-EOF
-}
+# set default targets
+if [[ ! -v targets ]]; then
+ case $HOSTNAME in
+ x2|fz)
+ if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
+ targets=($HOME_DOMAIN)
+ fi
+ ;;
+ tp)
+ targets=(frodo)
+ if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
+ if timeout -s 9 10 ssh x2 :; then
+ targets+=(x2)
+ fi
+ fi
+ ;;
+ frodo)
+ targets=()
+ ;;
+ *)
+ echo "$0: error: no default targets for this host, use -t"
+ exit 1
+ ;;
+ esac
+fi
-rsync-dirs() {
- local host=$1
- local path=$2
- rsync $dry_run_arg -ahi --relative --delete "$path" "root@$host:/"
-}
+echo "targets: ${targets[*]}"
-last-snap() {
- vol=${1##*/}
- cd /mnt/root
- last_snap=$(
- for f in $vol.20*; do
- printf "%s %s\n" $(date -d $(sed -r 's/(.{4})(..)(.{5})(..)(.*)/\1-\2-\3:\4:\5/' <<<${f#$vol.}) +%s) $f
- done | sort -r | head -n 1 | awk '{print $2}'
- )
- last_snaps+=($last_snap)
-}
-# note q is owned by root:1000
-# note p is owned 1000:1000 and chmod 700
-mountpoints=(/q)
-if mountpoint /p; then
- mountpoints+=(/p)
-fi
-if [[ ! $targets ]]; then
+if (( ${#mountpoints[@]} )); then
+ for mp in ${mountpoints[@]}; do
+ if [[ -e /nocow/btrfs-stale/$mp ]]; then
+ echo "$0: warning: $mp stale. Sleeping for 3 seconds in case you want to cancel."
+ sleep 3
+ fi
+ done
+else # set default mountpoints
case $HOSTNAME in
- tp|x2)
- if ! timeout -s 9 10 ssh frodo :; then
- targets=($HOME_DOMAIN)
+ frodo)
+ prospective_mps=(/i)
+ ;;
+ *)
+ prospective_mps=(/a /q)
+ if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
+ prospective_mps+=(/o)
fi
;;
esac
- targets=(frodo)
+ case ${targets[0]} in
+ kw|kww)
+ prospective_mps=(/a)
+ ;;
+ esac
+
+ for mp in ${prospective_mps[@]}; do # default mountpoints to sync
+ if [[ -e /nocow/btrfs-stale/$mp ]]; then
+ echo "$0: warning: $mp stale, not adding to default mountpoints"
+ continue
+ fi
+ if awk '{print $2}' /etc/fstab | grep -xF $mp &>/dev/null; then
+ mountpoints+=($mp)
+ fi
+ done
fi
+echo "mountpoints: ${mountpoints[*]}"
-# umount first to ensure we don't have any errors
-# todo: do some kill fuser stuff to make umount more reliable
-# todo: setup sync systemd timer on $primary, once per hour.
-# todo: setup lock so that if this is already running, we exit out, so
-# that manual runs don't interfere with cronjobs.
-if [[ $primary ]] && ! $dry_run; then
- for m in ${mountpoints[@]}; do
- # note, this won't work for /i, due to path being /mnt/iroot
- # todo: include /i for treetowl/frodo
- btrfs property set -ts /mnt/root$m ro true
- ssh root@$primary bash <<EOF
-set -ex
-umount $m
-[[ -e /mnt/root$m ]] || exit 0
-btrfs sub del /mnt/root$m
+##### end command line parsing ########
+
+rsync-dirs() {
+ local host=$1
+ local path=$2
+ m rsync $dry_run_arg -ahi --relative --delete "$path" "root@$host:/"
+}
+
+vol-conf() {
+ cat >>/etc/btrbk.conf <<EOF
+volume $vol
EOF
- done
+}
+sub-conf() {
+ cat >>/etc/btrbk.conf <<EOF
+subvolume $sub
+EOF
+}
+tg-conf() {
+ cat >>/etc/btrbk.conf <<EOF
+target send-receive ssh://$tg$vol/btrbk
+EOF
+}
+m() { printf "%s: %s\n" "${0##*/}" "$*"; "$@"; }
+
+
+if ! which btrbk &>/dev/null; then
+ echo "$0: error: no btrbk binary found"
fi
-for tg in ${targets[@]}; do
- cat >/etc/btrbk.conf <<'EOF'
-ssh_identity /root/.ssh/id_rsa
-transaction_syslog daemon
+cat >/etc/btrbk.conf <<EOF
+ssh_identity /root/.ssh/home
+# Just a guess that local7 is a good facility to pick.
+# It's a bit odd that the transaction log has to be logged to
+# a file or syslog, while other output is sent to std out.
+# The man does not mention a way for them to be together, but
+# I dunno if setting a log level like warn might also output
+# transaction info.
+transaction_syslog local7
# so we only run one at a time
lockfile /var/lock/btrbk.lock
# only make a snapshot if things have changed
snapshot_create onchange
-# much less snapshots because I have less space on the
-# local filesystem.
-snapshot_preserve 2h 2d
+# I could make this different from target_preserve,
+# if one disk had less space.
+# for now, keeping them equal.
+snapshot_preserve 36h 14d 8w 24m
+snapshot_preserve_min 4h
+snapshot_dir btrbk
# so, total backups = ~89
-target_preserve 48h 14d 8w 24m
-target_preserve_min 6h
+target_preserve 36h 14d 8w 24m
+target_preserve_min 4h
# if something fails and it's not obvious, try doing
# btrbk -l debug -v dryrun
+
+rate_limit $rate_limit
EOF
- remote_target="target send-receive ssh://${tg}/mnt/root"
- if [[ $tg == frodo && $HOSTNAME == treetowl ]]; then
- target-section /mnt/iroot i
+# if our mountpoints are from stale snapshots,
+# it doesn't make sense to do a backup.
+check-subvol-stale ${mountpoints[@]} || exit 1
+
+for tg in ${targets[@]}; do
+ # for an initial run, btrbk requires the dir to exist
+ ssh root@$tg mkdir -p /mnt/root/btrbk
+done
+
+
+for m in ${mountpoints[@]}; do
+ # for /i, some special cases. there is just one static target and direction.
+ if [[ $m == /i ]]; then
+ vol=/mnt/iroot
+ vol-conf
+ sub=i
+ sub-conf
+ tg=frodo
+ vol=/mnt/root
+ tg-conf
+ else
+ vol=/mnt/root
+ vol-conf
+ sub=${m##*/}
+ sub-conf
+ for tg in ${targets[@]}; do
+ tg-conf
+ done
fi
- for m in ${mountpoints[@]}; do
- target-section /mnt/root ${m##*/}
- done
done
+
+# todo: umount first to ensure we don't have any errors
+# todo: do some kill fuser stuff to make umount more reliable
+
+
if $conf_only; then
exit
fi
if $dry_run; then
- btrbk -n run
+ m btrbk -v -n $resume_arg run
else
- btrbk -q run
+ # -q and just using the syslog option seemed nice,
+ # but it doesn't show when a send has a parent and when it doesn't.
+ m btrbk $verbose_arg $progress_arg $resume_arg run
fi
-# if we have /p, rsync to targets without /p
-if mountpoint /p; then
+# if we have it, sync to systems which don't
+if mountpoint $rsync_mountpoint >/dev/null; then
for tg in ${targets[@]}; do
case $tg in
tp|li|lk)
- # todo, test this
for x in /p/c/machine_specific/*.hosts; do
if grep -qxF $tg $x; then
dir=${x%.hosts}
- rsync-dirs ${dir##*/} $dir
+ rsync-dirs $tg $dir
fi
done
;;
done
fi
-first_root=$(awk '$2 == "/mnt/root" {print $1}' /etc/mtab)
+if ! $dry_run; then
+ m $script_dir/mount-latest-remote ${targets[@]}
+fi
-# make $primary have the rw snapshot
-if [[ $primary ]] && ! $dry_run; then
- fstab=()
- for m in ${mountpoints[@]}; do
- last-snap $m
- fstab+=("$first_root $m btrfs noatime,subvol=$last_snap 0 0")
- done
- printf "%s\n" "${fstab[@]}" | cedit /etc/fstab
- for d in ${mountpoints[@]}; do
- mount $d
- btrfs sub del /mnt/root$d
- done
- ssh root@primary bash -s "${mountpoints[*]}" "${last_snaps[*]}" <<'EOF'
-set -xe
-mountpoints=($1)
-last_snaps=($2)
-first_root=$(awk '$2 == "/mnt/root" {print $1}' /etc/mtab)
-for ((i=0; i < ${#mountpoints[@]}; i++)); do
- m=${mountpoints[i]}
- vol=${m##*/}
- fstab+=("$first_root $m btrfs noatime,subvol=$vol 0 0")
- cd /mnt/root
- btrfs sub snapshot ${last_snaps[i]} $vol
- mount $m
-done
-EOF
-fi
+# todo: move variable data we don't care about backing up
+# to /nocow and symlink it.
# background on btrbk timezones. with short/long, timestamps use local time.
# However, in the short term, there will be no inconsistencies.
# I don't see any problem with shifting when the day starts for
# retention, so I'm using long-iso.
+
+# note to create a long-iso timestamp: date +%Y%m%dT%H%M%S%z
iankelling.org / git / distro-setup / blobdiff