[[ $EUID == 0 ]] || exec sudo -E "$BASH_SOURCE" "$@"
+usage() {
+ echo "top of script file:"
+ sed -n '1,/^[# ]*end command line/{p;b};q' "$0"
+ exit $1
+}
+
conf_only=false
-dry_run=false
-# mostly for testing
-case $1 in
- -c) conf_only=true ;;
- -n) dry_run=true ;;
- ?*) echo "$0: error: unsupported arg"; exit 1 ;;
-esac
-
-# background on timezones. with short/long, timestamps use local time.
-# for long, if your local time moves backwards, by moving timezones or
-# for an hour when daylight savings changes it, you will temporarily get
-# a more aggressive retention policy for the overlapping period, and
-# vice versa for the opposite timezone move. The alternative is using
-# long-iso, which puts timezone info into the timestamp, which means
-# that instead of shifting time, you shift the start of day/week/month
-# which is used for retention to your new local time, which means for
-# example, if you moved forward by 8 hours, the daily/weekly/monthly
-# retention will be 8 hours more aggressive since midnight is at a new
-# time, unless you fake the timzeone using the TZ env variable.
-# However, in the short term, there will be no inconsistencies.
-# I don't see any problem with shifting when the day starts for
-# retention, so I'm using long-iso.
+dry_run=false # mostly for testing
+
+temp=$(getopt -l help,long-opt hcnt "$@") || usage 1
+eval set -- "$temp"
+while true; do
+ case $1 in
+ -c) conf_only=true; shift ;;
+ -n) dry_run=true; dry_run_arg=-n; shift ;;
+ -t) IFS=, targets=($2); shift 2 ;;
+ -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=()
+
+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@$host:/"
+}
-target_host=frodo
-cat >/etc/btrbk.conf <<'EOF'
+last-snap() {
+ vol=${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
+ case $HOSTNAME in
+ tp|x2)
+ if ! timeout -s 9 10 ssh frodo :; then
+ targets=($HOME_DOMAIN)
+ fi
+ ;;
+ esac
+ targets=(frodo)
+fi
+
+
+# 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
+EOF
+ done
+fi
+
+for tg in ${targets[@]}; do
+ cat >/etc/btrbk.conf <<'EOF'
ssh_identity /root/.ssh/id_rsa
transaction_syslog daemon
# btrbk -l debug -v dryrun
EOF
+ remote_target="target send-receive ssh://${tg}/mnt/root"
-case $HOSTNAME in
- tp|x2)
- if ! timeout -s 9 10 ssh frodo :; then
- target_host=$HOME_DOMAIN
- cat >>/etc/btrbk.conf <<EOF
-ssh_port 2222
-EOF
- fi
- ;;
-esac
-
-if [[ $HOSTNAME != frodo ]]; then
- remote_target="target send-receive ssh://${target_host}/mnt/root/${HOSTNAME}-btrbk"
-fi
-
-target-section() {
- root=$1
- subvol=$2
- mountpoint $root &>/dev/null || return
- cat >>/etc/btrbk.conf <<EOF
-volume $root
-subvolume $subvol
-$remote_target
-
-EOF
-}
-
-target-section /mnt/iroot i
-target-section /mnt/root q
+ if [[ $tg == frodo && $HOSTNAME == treetowl ]]; then
+ target-section /mnt/iroot i
+ fi
+ for m in ${mountpoints[@]}; do
+ target-section /mnt/root ${m##*/}
+ done
+done
if $conf_only; then
exit
else
btrbk -q run
fi
+
+# if we have /p, rsync to targets without /p
+if mountpoint /p; 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##*/} $dir
+ fi
+ done
+ ;;
+ esac
+ done
+fi
+
+first_root=$(awk '$2 == "/mnt/root" {print $1}' /etc/mtab)
+
+# 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
+
+
+# background on btrbk timezones. with short/long, timestamps use local time.
+# for long, if your local time moves backwards, by moving timezones or
+# for an hour when daylight savings changes it, you will temporarily get
+# a more aggressive retention policy for the overlapping period, and
+# vice versa for the opposite timezone move. The alternative is using
+# long-iso, which puts timezone info into the timestamp, which means
+# that instead of shifting time, you shift the start of day/week/month
+# which is used for retention to your new local time, which means for
+# example, if you moved forward by 8 hours, the daily/weekly/monthly
+# retention will be 8 hours more aggressive since midnight is at a new
+# time, unless you fake the timzeone using the TZ env variable.
+# 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.
iankelling.org / git / distro-setup / blobdiff