#!/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.
set -eE -o pipefail
trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
[[ $EUID == 0 ]] || exec sudo -E "$BASH_SOURCE" "$@"
-
usage() {
echo "top of script file:"
sed -n '1,/^[# ]*end command line/{p;b};q' "$0"
exit $1
}
-script_dir=$(dirname $(readlink "$BASH_SOURCE"))
+script_dir=$(dirname $(readlink -f "$BASH_SOURCE"))
# todo: finish figuring out fai / distro-setup
# initial fstab / subvol setup.
dry_run=false # mostly for testing
resume_arg=
-temp=$(getopt -l help hcnrt: "$@") || usage 1
+temp=$(getopt -l help hcnprt: "$@") || usage 1
eval set -- "$temp"
while true; do
case $1 in
-c) conf_only=true; shift ;;
-n) dry_run=true; dry_run_arg=-n; shift ;;
+ -p) progress_arg="--progress"; shift ;;
+ # btrbk arg: Resume only. Skips snapshot creation.
-r) resume_arg=-r; shift ;;
- -t) IFS=, targets=($2); shift 2 ;;
+ -t) IFS=, targets=($2); unset IFS; shift 2 ;;
-h|--help) usage ;;
--) shift; break ;;
*) echo "$0: Internal error!" ; exit 1 ;;
##### end command line parsing ########
-target-section() {
- local root=$1
- local subvol=$2
- mountpoint $root &>/dev/null || return
- cat >>/etc/btrbk.conf <<EOF
-volume $root
-subvolume $subvol
-$remote_target
-
-EOF
-}
-
rsync-dirs() {
local host=$1
local path=$2
- rsync $dry_run_arg -ahi --relative --delete "$path" "root@$host:/"
+ m rsync $dry_run_arg -ahi --relative --delete "$path" "root@$host:/"
+}
+
+vol-conf() {
+ cat >>/etc/btrbk.conf <<EOF
+volume $vol
+EOF
+}
+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
+
+cat >/etc/btrbk.conf <<'EOF'
+ssh_identity /root/.ssh/id_rsa
+# 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
+
+# default format of short does not accomidate hourly preservation setting
+timestamp_format long-iso
+
+# only make a snapshot if things have changed
+snapshot_create onchange
+# 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 36h 14d 8w 24m
+target_preserve_min 4h
+
+# if something fails and it's not obvious, try doing
+# btrbk -l debug -v dryrun
+EOF
# note q is owned by root:1000
# note p is owned 1000:1000 and chmod 700
-mountpoints=(/q)
-if awk '{print $2}' /etc/fstab | grep -xF /p &>/dev/null; then
- mountpoints+=(/p)
+mountpoints=(/a)
+qmnt=/q
+if awk '{print $2}' /etc/fstab | grep -xF $qmnt &>/dev/null; then
+ mountpoints+=($qmnt)
fi
# if our mountpoints are from stale snapshots,
targets=($HOME_DOMAIN)
fi
;;
+ treetowl)
+ targets=(frodo)
+ if timeout -s 9 10 ssh x2 :; then
+ targets+=(x2)
+ fi
+ ;;
+ *)
+ targets=(frodo)
+ ;;
esac
- targets=(frodo)
+ echo "targets: ${targets[*]}"
fi
-# todo: make bash shell prompt show something when
-# a subvol on current host is not fresh.
-# umount first to ensure we don't have any errors
-# todo: do some kill fuser stuff to make umount more reliable
-# todo: run this on a systemd timer on $primary, once per hour,
-# and if primary is, change that timer over to primary, and make
-# sure we mount the latest
-# todo: setup lock so that if this is already running, we exit out, so
-# that manual runs don't interfere with cronjobs.
-
+# for i, we just do a 1 way sync from master to backup,
+# and manually manage any changes to that.
+do_i=false
for tg in ${targets[@]}; do
- cat >/etc/btrbk.conf <<'EOF'
-ssh_identity /root/.ssh/id_rsa
-transaction_syslog daemon
+ # for an initial run, btrbk requires the dir to exist
+ ssh root@$tg mkdir -p /mnt/root/btrbk
+ if [[ $tg == frodo && $HOSTNAME == treetowl ]]; then
+ do_i=true
+ fi
+done
-# so we only run one at a time
-lockfile /var/lock/btrbk.lock
-# default format of short does not accomidate hourly preservation setting
-timestamp_format long-iso
+vol=/mnt/root
+vol-conf
+for m in ${mountpoints[@]}; do
+ sub=${m##*/}
+ sub-conf
+ for tg in ${targets[@]}; do
+ tg-conf
+ done
+done
-# 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
-# for now, keeping them equal for simplicity sake
-snapshot_preserve 48h 14d 8w 24m
-snapshot_preserve_min 6h
-snapshot_dir btrbk
+if $do_i; then
+ vol=/mnt/iroot
+ vol-conf
+ sub=i
+ sub-conf
+ tg=frodo
+ vol=/mnt/root
+ tg-conf
+fi
-# so, total backups = ~89
-target_preserve 48h 14d 8w 24m
-target_preserve_min 6h
-# if something fails and it's not obvious, try doing
-# btrbk -l debug -v dryrun
-EOF
- remote_target="target send-receive ssh://${tg}/mnt/root/btrbk"
+# todo: umount first to ensure we don't have any errors
+# todo: do some kill fuser stuff to make umount more reliable
+# todo: run this on a systemd timer on $primary, once per hour,
+# and if primary is, change that timer over to primary, and make
+# sure we mount the latest
+
- if [[ $tg == frodo && $HOSTNAME == treetowl ]]; then
- target-section /mnt/iroot i
- fi
- for d in ${mountpoints[@]}; do
- target-section /mnt/root ${d##*/}
- done
-done
if $conf_only; then
exit
fi
if $dry_run; then
- btrbk -n $resume_arg run
+ m btrbk -n $resume_arg run
else
- btrbk -q $resume_arg 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 $progress_arg $resume_arg run
fi
# if we have /p, rsync to targets without /p
fi
if ! $dry_run; then
- for tg in ${targets[@]}; do
- scp $script_dir/{mount-latest-subvol,check-subvol-stale} \
- root@$tg:/usr/local/bin
- ssh root@$tg bash <<'EOF'
-set -e
-chmod +x /usr/local/bin/{mount-latest-subvol,check-subvol-stale}
-mount-latest-subvol
-EOF
- done
+ m $script_dir/mount-latest-remote ${targets[@]}
fi
iankelling.org / git / distro-setup / blobdiff