iankelling.org Git - distro-setup/blob - btrbk-run

   1 #!/bin/bash
   2 # Copyright (C) 2016 Ian Kelling
   3
   4 # Licensed under the Apache License, Version 2.0 (the "License");
   5 # you may not use this file except in compliance with the License.
   6 # You may obtain a copy of the License at
   7
   8 #     http://www.apache.org/licenses/LICENSE-2.0
   9
  10 # Unless required by applicable law or agreed to in writing, software
  11 # distributed under the License is distributed on an "AS IS" BASIS,
  12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 # See the License for the specific language governing permissions and
  14 # limitations under the License.
  15
  16
  17 # todo: if we cancel in the middle of a btrfs send, then run again
  18 # immediately, the received subvolume doesn't get a Received UUID:
  19 # field, and we won't mount it. Need to figure out a solution that will
  20 # fix this.
  21
  22
  23 [[ $EUID == 0 ]] || exec sudo -E "${BASH_SOURCE[0]}" "$@"
  24
  25 source /usr/local/lib/err
  26
  27 usage() {
  28   cat <<'EOF'
  29 btrbk-run [OPTIONS] [run|resume|archive]
  30 usually -t TARGET_HOST or -s SOURCE_HOST
  31
  32 Note, at source location, intentionally not executable, run and read
  33 install-my-scripts.
  34
  35 EOF
  36   echo "top of script file:"
  37   sed -n '1,/^[# ]*end command line/{p;b};q' "$0"
  38   exit $1
  39 }
  40
  41
  42
  43 script_name="${BASH_SOURCE[0]}"
  44 script_name="${script_name##*/}"
  45 pre="${SSH_CLIENT:+$HOSTNAME} $script_name:"
  46 m() { if $verbose; then printf "$pre%s\n"  "$*"; fi;  "$@"; }
  47 e() { printf "$pre%s\n"  "$*"; }
  48 die() { printf "$pre%s\n" "$*" >&2; echo "exiting with status 1" >&2; exit 1; }
  49 mexit() { echo "$pre: exiting with status $1"; exit $1; }
  50
  51 # latest $MAIL_HOST
  52 if [[ -e /b/bash_unpublished/source-state ]]; then
  53   source /b/bash_unpublished/source-state
  54 fi
  55
  56 # note q is owned by root:1000
  57
  58 mountpoints=()
  59
  60 rsync_mountpoint=/q
  61
  62 ret=0
  63 # default options
  64 conf_only=false
  65 dry_run=false # mostly for testing
  66 rate_limit=no
  67 verbose=true; verbose_arg=-v
  68 force=false
  69 if [[ $INVOCATION_ID ]]; then
  70   # INVOCATION_ID means running as a systemd service. we cant show progress in this case,
  71   # but if we pass the arg, it will insert mbuffer into the command.
  72   progress_arg=
  73 else
  74   progress_arg="--progress"
  75 fi
  76 incremental_strict=false
  77 pull_reexec=false
  78
  79 default_args_file=/etc/btrbk-run.conf
  80 if [[ -s $default_args_file ]]; then
  81   # shellcheck disable=SC2046 # we want word splitting
  82   set -- $(< $default_args_file) "$@"
  83   # i havent used this feature yet, so warn about it
  84   echo "$0: warning: default btrbk-run options set in $default_args_file (sleeping 5 seconds):"
  85   cat $default_args_file
  86   sleep 5
  87 fi
  88
  89 targets=()
  90 early=false
  91 cron=false
  92 fast=false
  93 kd_spread=false
  94 orig_args=("$@")
  95 temp=$(getopt -l cron,fast,pull-reexec,help 23cefikl:m:npqrs:t:vh "$@") || usage 1
  96 eval set -- "$temp"
  97 while true; do
  98   case $1 in
  99     # some behaviors specific to running under cron:
 100     # - skip hosts where xprintidle haven't been idle recently
 101     # - if we can't ssh to 1 or more hosts, still do the rest
 102     # - if we aren't MAIL_HOST and no -m or -s, just exit
 103     --cron)
 104       cron=true
 105       pre=
 106       ;;
 107     # for the rare case we want to run multiple instances at the same time
 108     -2) conf_suf=2 ;;
 109     -3) conf_suf=3 ;;
 110     # only creates the config file, does not run btrbk
 111     -c) conf_only=true ;;
 112     # quit early, just btrbk, no extra remounting etc.
 113     -e) early=true ;;
 114     -f) force=true ;;
 115     # skip various checks. when we run twice in a row for
 116     # switch mail-host, no need to repeat the same checks again.
 117     --fast) fast=true ;;
 118     -i) incremental_strict=true ;;
 119     # note this implies resume, cron and -p
 120     -k) kd_spread=true ;;
 121     # bytes per second, suffix k m g
 122     -l) rate_limit=$2; shift ;;
 123     # Comma separated mountpoints to backup. This has defaults set below.
 124     -m) IFS=, mountpoints=($2); unset IFS; shift ;;
 125     -n) dry_run=true ;;
 126     # preserve existing snapshots and backups
 127     -p) preserve_arg=-p ;;
 128     # internal option for rerunning under newer SOURCE_HOST version.
 129     --pull-reexec) pull_reexec=true;;
 130     # quiet
 131     -q) verbose=false; verbose_arg=; progress_arg= ;;
 132     # source host to receive a backup from
 133     -s)
 134       source=$2
 135       bbksource=$source
 136       if [[ $source == *:* ]]; then
 137         bbksource="[$source]"
 138       fi
 139       shift
 140       ;;
 141     # target hosts to send to. empty is valid for just doing local
 142     # snapshot. we have default hosts we will populate.
 143     -t) IFS=, targets=($2); unset IFS; shift ;;
 144     # verbose.
 145     -v) verbose=true; verbose_arg=-v ;;
 146     -h|--help) usage ;;
 147     --) shift; break ;;
 148     *) die "Internal error!" ;;
 149   esac
 150   shift
 151 done
 152
 153 cmd_arg="$1"
 154
 155 if $kd_spread; then
 156   if [[ $cmd_arg && $cmd_arg != resume ]]; then
 157     die "dont pass -k without resume or empty run arg"
 158   fi
 159   if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
 160     die "something went wrong, -k not meant to be run on MAIL_HOST"
 161   fi
 162   cmd_arg=resume
 163   preserve_arg=-p
 164   cron=true
 165 fi
 166
 167 if [[ ! $cmd_arg ]]; then
 168   cmd_arg=run
 169 fi
 170
 171
 172 std_preserve="36h 14d 8w 24m"
 173 q_preserve="18h 14d 8w"
 174
 175 case $cmd_arg in
 176   run|resume) : ;;
 177
 178   # This works better than the normal archive command. We have to
 179   # specify the mount points, but that is what we are used to doing and
 180   # we prefer it. Another difference is that archive works recursively
 181   # and we don't care about that. Sometimes we may still want to run
 182   # btrbk archive, but it doesn't even use the config file, so just
 183   # run it directly, eg:
 184   # time s btrbk -v archive /mnt/r7/amy/boot/btrbk ssh://bo/mnt/boot2/btrbk
 185   archive)
 186     cmd_arg=resume
 187     std_preserve="999h 999d 999w 999m"
 188     q_preserve="$std_preserve"
 189     preserve_arg=-p
 190     ;;
 191   *) die "untested command arg" ;;
 192 esac
 193
 194 if (( $# > 1 )); then
 195   die: "only 1 nonoption arg is supported"
 196 fi
 197
 198 if [[ -v targets && $source ]]; then
 199   # note, this doesnt need to be the case, but
 200   # we would need to think about it.
 201   die "error: -t and -s are mutually exclusive"
 202 fi
 203
 204 ### end options parsing
 205
 206 # remove path from earlier version of btrbk
 207 rm -f /usr/sbin/btrbk
 208 # note, this still works as intended if there is no /usr/bin/btrbk
 209 if [[ /a/opt/btrbk/btrbk -nt /usr/bin/btrbk ]]; then
 210   if [[ -e /b/distro-functions/src/package-manager-abstractions ]]; then
 211     . /b/distro-functions/src/package-manager-abstractions
 212     pi asciidoctor
 213   fi
 214   cd /a/opt/btrbk
 215   m make install
 216 fi
 217
 218 # TODO: i wonder if there should be an option to send to the default
 219 # targets, plus any given on the command line.
 220
 221
 222 # set default targets
 223 if [[ ! -v targets && ! $source ]]; then
 224   if $cron && ! $kd_spread && [[ $HOSTNAME != "$MAIL_HOST" ]]; then
 225     echo "MAIL_HOST=$MAIL_HOST, nothing to do"
 226     mexit 0
 227   fi
 228
 229   at_work=false
 230   at_home=false
 231
 232   case $HOSTNAME in
 233     kw|kd|frodo|x2|x3|sy) : ;;
 234     *)
 235       die "error: no default targets for this host, use -t"
 236       ;;
 237   esac
 238
 239   case $HOSTNAME in
 240     kw)
 241       at_work=true
 242       ;;&
 243     kd|frodo)
 244       at_home=true
 245       ;;&
 246     x2|x3|sy)
 247       if [[ $(dig +short @10.2.0.1 -x 10.2.0.2 2>&1 ||:) == kd.b8.nz. ]] \
 248            && ip n show 10.2.0.1 | grep . &>/dev/null; then
 249         at_home=true
 250       elif ping -q -c1 -w1 hal.office.fsf.org &>/dev/null \
 251           && ip n show 192.168.0.26 | grep . &>/dev/null; then
 252         at_work=true
 253       fi
 254       ;;&
 255     *)
 256       if $at_home; then
 257         if ! $kd_spread && [[ $HOSTNAME != x3 ]]; then
 258           # main work machine
 259           if ping -q -c1 -w1 x3.office.fsf.org &>/dev/null; then
 260             targets+=(x3.office.fsf.org)
 261           elif ping -q -c1 -w1 $h.b8.nz &>/dev/null; then
 262             # in case we took it home
 263             targets+=(x3.b8.nz)
 264           else
 265             targets+=(x3wg.b8.nz)
 266           fi
 267         fi
 268         if [[ $HOSTNAME != kd ]]; then
 269           targets+=(kd.b8.nz)
 270         fi
 271         wireless_home_hosts=(
 272           x2
 273           sy
 274         )
 275         for h in ${wireless_home_hosts[@]}; do
 276           if [[ $HOSTNAME != "$h" ]]; then
 277             if ping -q -c1 -w1 $h.b8.nz &>/dev/null; then
 278               targets+=($h.b8.nz)
 279             elif ping -q -c1 -w1 ${h}w.b8.nz &>/dev/null; then
 280               targets+=(${h}w.b8.nz)
 281             fi
 282           fi
 283         done
 284       elif $at_work; then
 285         targets+=(i.b8.nz)
 286         for h in x2 x3 kw; do
 287           if [[ $HOSTNAME == "$h" ]]; then
 288             continue
 289           fi
 290           if ping -q -c1 -w1 $h.office.fsf.org &>/dev/null; then
 291             targets+=($h.office.fsf.org)
 292           fi
 293         done
 294       else
 295         targets+=(i.b8.nz)
 296       fi
 297       ;;
 298   esac
 299 fi
 300
 301 if [[ ${mountpoints[0]} ]]; then
 302   for mp in ${mountpoints[@]}; do
 303     if [[ -e /nocow/btrfs-stale/$mp ]]; then
 304       die "error: $mp is stale, mount-latest-subvol first"
 305     fi
 306   done
 307 else
 308   # set default mountpoints
 309   if [[ ${targets[0]} == tp ]]; then
 310     prospective_mps=(/a)
 311   else
 312     case $HOSTNAME in
 313       *)
 314         prospective_mps=()
 315         if [[ $source ]]; then
 316           source_state="$(ssh $source cat /a/bin/bash_unpublished/source-state)"
 317           eval "$source_state"
 318           source_host="$(ssh $source cat /etc/hostname)"
 319           if [[ $source_host == "$MAIL_HOST" ]]; then
 320             prospective_mps+=(/o)
 321           fi
 322           if [[ $source_host == "$HOST2" ]]; then
 323             prospective_mps+=(/a /ar /qr /qd /q)
 324           fi
 325         else
 326           if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
 327             prospective_mps+=(/o)
 328           fi
 329           if [[ $HOSTNAME == "$HOST2" ]]; then
 330             prospective_mps+=(/a /ar /qr /qd /q)
 331           fi
 332           if $kd_spread; then
 333             prospective_mps=(/a /ar /o /qr /qd /q)
 334           fi
 335         fi
 336         # note: put q last just in case its specific retention options were to
 337         # affect other config sections. I havent tested if that is the case.
 338         ;;
 339     esac
 340   fi
 341   for mp in ${prospective_mps[@]}; do # default mountpoints to sync
 342     if [[ -e /nocow/btrfs-stale/$mp ]]; then
 343       e "warning: $mp stale, not adding to default mountpoints"
 344       continue
 345     fi
 346     if awk '{print $2}' /etc/fstab | grep -xF $mp &>/dev/null; then
 347       mountpoints+=($mp)
 348     fi
 349   done
 350 fi
 351
 352 if (( ! ${#mountpoints[@]} )); then
 353   die didnt get mountpoint arg and had no defaults
 354 fi
 355
 356 ##### end command line parsing ########
 357
 358 #### begin pre-checks #####
 359
 360 # todo: this has a timing problem, since btrbk.timer could activate the service after this check.
 361 if ! $fast && [[ $source ]]; then
 362   if [[ $(ssh $source ps --no-headers -o comm 1) == systemd ]]; then
 363     status=$(ssh $source systemctl is-active btrbk.service) || : # normally returns 3
 364     case $status in
 365       inactive|failed) : ;;
 366       *)
 367         echo "$0: error: cron btrbk is running on source. exiting out of caution"
 368         mexit 1
 369     esac
 370   fi
 371 fi
 372
 373 if ! command -v btrbk &>/dev/null; then
 374   die "error: no btrbk binary found"
 375 fi
 376
 377
 378 #### end pre-checks #####
 379
 380 mkdir -p /var/log/btrbk
 381 # The journal doesnt go back to my oldest backups, and I've found myself
 382 # wanting older logs. Not going to bother expiring old logs, since it is
 383 # fine if they go back years.
 384 log_path=/var/log/btrbk/$(date +%F_%T%:::z).log
 385 echo copying output to $log_path
 386 exec &> >(ts "%F %T" | tee -a $log_path)
 387
 388
 389 if $verbose; then
 390   printf "$pre options: conf_only=%s\ndry_run=%s\nrate_limit=%s\nverbose=%s\ncmd_arg=%s" "$conf_only" "$dry_run" "$rate_limit" "$verbose" "$cmd_arg"
 391 fi
 392
 393 if [[ -v targets ]]; then
 394   echo "targets: ${targets[*]}"
 395 fi
 396
 397 if [[ $source ]]; then
 398   echo "source: $source"
 399 fi
 400
 401 echo "mountpoints: ${mountpoints[*]}"
 402
 403
 404
 405 # pull_reexec stops us from getting into an infinite loop if there is some
 406 # kind of weird problem
 407 pulla=false
 408 for m in "${mountpoints[@]}"; do
 409   if [[ $m == /a ]]; then
 410     pulla=true
 411     break
 412   fi
 413 done
 414 if ! $pull_reexec && [[ $source ]] && $pulla ; then
 415   tmpf=$(mktemp)
 416   m rsync -ra $source:/usr/local/bin/{mount-latest-subvol,check-subvol-stale} /usr/local/bin
 417   m rsync -ra $source:/usr/local/lib/err /usr/local/lib
 418   m scp $source:/a/bin/distro-setup/btrbk-run $tmpf
 419   if ! diff -q $tmpf ${BASH_SOURCE[0]}; then
 420     e "found different version on host $source. reexecing"
 421     install -T $tmpf /usr/local/bin/btrbk-run
 422     m /usr/local/bin/btrbk-run --pull-reexec "${orig_args[@]}"
 423     mexit 0
 424   fi
 425 fi
 426
 427
 428 if ! $fast; then
 429   # if our mountpoints are from stale snapshots,
 430   # it doesn't make sense to do a backup.
 431   m check-subvol-stale ${mountpoints[@]} || die "found stale mountpoints in ${mountpoints[*]}"
 432
 433   # for an initial run, btrbk requires the dir to exist.
 434   mkdir -p /mnt/{root,o}/btrbk
 435 fi
 436 local_zone=$(date +%z)
 437
 438 if [[ $source ]]; then
 439   if $fast; then
 440     zone=$local_zone
 441   else
 442     if ! zone=$(ssh root@$source date +%z); then
 443       if $conf_only; then
 444         echo "$0: warning: failed to ssh to root@$source"
 445       else
 446         die failed to ssh to root@$source
 447       fi
 448     fi
 449     if [[ $zone != "$local_zone" ]]; then
 450       die "error: dont confuse yourself with multiple time zones. $h has different timezone than localhost"
 451     fi
 452   fi
 453 else
 454
 455   sshable=()
 456   sshfail=()
 457   for h in ${targets[@]}; do
 458     if $fast || $conf_only; then
 459       # Use some typical values in this case
 460       root_size=$(( 1024 * 1024 * 2000 )) #2tb
 461       percent_used=10
 462       zone=$(date +%z)
 463     elif remote_str=$(timeout -s 9 6 ssh root@$h "mkdir -p /mnt/root/btrbk /mnt/o/btrbk && date +%z && df --output=size,pcent / | tail -n1"); then
 464       mapfile -t tmp_array <<<"$remote_str"
 465       zone="${tmp_array[0]}"
 466       IFS=" " read -r root_size percent_used <<<"${tmp_array[1]}"
 467       percent_used=${percent_used%%%}
 468
 469       if (( ${#tmp_array[@]} != 2 )); then
 470         die "error: didnt get 2 lines in test ssh to target $h. investigate"
 471       fi
 472       case $percent_used in
 473         [0-9]|[1-9][0-9]) : ;;
 474         *)
 475           die "error: didnt get percent disk use in test ssh to target $h. investigate"
 476           ;;
 477       esac
 478     else
 479       sshfail+=($h)
 480       continue
 481     fi
 482
 483     # we may be booted into a bootstrap fs or something
 484     min_root_kb=$(( 1024 * 1024 * 200 )) # 200 gb
 485     if (( root_size < min_root_kb )); then
 486       continue
 487     fi
 488
 489     if (( percent_used >= 98 )); then
 490       die "error: filesystem on target $h is $percent_used % full"
 491     fi
 492
 493     # on sy, xprintidle is resetting every 12 seconds even when not
 494     # idle, i dunno why, instead we are checking if the screen is locked,
 495     # which is good enough.
 496     #
 497     # This is a separate ssh because the command can fail and thatis ok.
 498     if $cron && ! $force; then
 499       locked=false
 500       if lock_info=$(timeout -s 9 6 ssh $h DISPLAY=:0 xscreensaver-command -time); then
 501         if [[ $lock_info != *non-blanked* ]]; then
 502           locked=true
 503         fi
 504       else
 505         locked=true
 506       fi
 507       if ! $locked; then
 508         # Ignore this host. i sometimes use a non-main machine for
 509         # testing or web browsing, knowing that everything will be wiped
 510         # by the next backup, but I dont want it to happen as Im using
 511         # it from cronjob.
 512         e "warning: $h: seems to be actively in use, skipping for now"
 513         continue
 514       fi
 515     fi
 516     sshable+=($h)
 517     if [[ $zone != "$local_zone" ]]; then
 518       die "error: dont confuse yourself with multiple time zones. $h has different timezone than localhost"
 519     fi
 520   done
 521   if [[ ! ${sshable[*]} ]] || { ! $cron && [[ ${sshfail[*]} ]]; }; then
 522     die "failed to ssh to hosts: ${sshfail[*]}"
 523   else
 524     if [[ ${sshfail[*]} ]]; then
 525       ret=1
 526       e "error: failed to ssh to ${sshfail[*]} but continuing with other hosts"
 527     fi
 528     targets=(${sshable[@]})
 529   fi
 530 fi
 531
 532
 533 cat >/etc/btrbk$conf_suf.conf <<EOF
 534 ssh_identity /q/root/h
 535 #ssh_identity /root/.ssh/home
 536
 537 # Just a guess that local7 is a good facility to pick.
 538 # It's a bit odd that the transaction log has to be logged to
 539 # a file or syslog, while other output is sent to std out.
 540 # The man does not mention a way for them to be together, but
 541 # I dunno if setting a log level like warn might also output
 542 # transaction info.
 543 transaction_syslog local7
 544
 545 # trying this out
 546 #stream_compress zstd
 547
 548 # so we only run one at a time
 549 lockfile                   /var/lock/btrbk$conf_suf.lock
 550
 551 # default format of short does not accomidate hourly preservation setting
 552 timestamp_format long-iso
 553
 554 # only make a snapshot if things have changed
 555 snapshot_create onchange
 556 # I could make this different from target_preserve,
 557 # if one disk had less space.
 558 # for now, keeping them equal.
 559 snapshot_preserve $std_preserve
 560 snapshot_preserve_min 6h
 561 snapshot_dir btrbk
 562 # so, total backups = ~58
 563 target_preserve $std_preserve
 564 target_preserve_min 6h
 565
 566 # i tried this when investigating: clone no source subvolume found error
 567 #incremental_prefs sro:1 srn:1 sao san:1 aro:1 arn:1
 568
 569 # if something fails and it's not obvious, try doing
 570 # btrbk -l debug -v dryrun
 571
 572 rate_limit $rate_limit
 573 EOF
 574
 575 if $incremental_strict; then
 576   cat >>/etc/btrbk$conf_suf.conf <<EOF
 577 incremental strict
 578 EOF
 579 fi
 580
 581 qconf() {
 582   case $sub in
 583     q)
 584       # q has sensitive data i dont want to backup for so long
 585       cat >>/etc/btrbk$conf_suf.conf <<EOF
 586 snapshot_preserve $q_preserve
 587 snapshot_preserve_min 2h
 588 snapshot_dir btrbk
 589 target_preserve $q_preserve
 590 target_preserve_min 2h
 591 EOF
 592       ;;
 593   esac
 594
 595 }
 596
 597 # make /q be last
 598 mp_count=${#mountpoints[@]}
 599 for (( i=0; i < mp_count - 1 ; i++ )); do
 600   if [[ ${mountpoints[i]} == /q ]]; then
 601     unset "mountpoints[i]"
 602     mountpoints+=(/q)
 603   fi
 604 done
 605
 606 for m in ${mountpoints[@]}; do
 607   case $m in
 608     /o)
 609       vol=/mnt/o
 610       ;;
 611     *)
 612       vol=/mnt/root
 613       ;;
 614   esac
 615
 616   sub=${m#/}
 617   if [[ $source ]]; then
 618     cat >>/etc/btrbk$conf_suf.conf <<EOF
 619 volume ssh://$bbksource$vol
 620 subvolume $sub
 621 EOF
 622     qconf
 623     cat >>/etc/btrbk$conf_suf.conf <<EOF
 624 target send-receive $vol/btrbk
 625 EOF
 626   fi
 627   if (( ${#targets[@]} )); then
 628     cat >>/etc/btrbk$conf_suf.conf <<EOF
 629 volume $vol
 630 subvolume $sub
 631 EOF
 632     qconf
 633     for tg in ${targets[@]}; do
 634       # handle ipv6
 635       if [[ $tg == *:* ]]; then
 636         tg="[$tg]"
 637       fi
 638       cat >>/etc/btrbk$conf_suf.conf <<EOF
 639 target send-receive ssh://$tg$vol/btrbk
 640 EOF
 641     done
 642   fi
 643 done
 644
 645 # todo: umount first to ensure we don't have any errors
 646 # todo: do some kill fuser stuff to make umount more reliable
 647
 648
 649 if $conf_only; then
 650   mexit 0
 651 fi
 652
 653
 654
 655 if $dry_run; then
 656   m btrbk -c /etc/btrbk$conf_suf.conf -v -n $cmd_arg
 657   mexit 0
 658 fi
 659 # -q and just using the syslog option seemed nice,
 660 # but it doesn't show when a send has a parent and when it doesn't.
 661 m btrbk -c /etc/btrbk$conf_suf.conf $preserve_arg $verbose_arg $progress_arg $cmd_arg
 662
 663 if $early; then
 664   exit 0
 665 fi
 666
 667 # todo: tp not valid anymore.
 668 # if we have it, sync to systems which don't
 669 if mountpoint $rsync_mountpoint >/dev/null; then
 670   for tg in ${targets[@]}; do
 671     case $tg in
 672       tp)
 673         dirs=(/p/c/machine_specific/tp)
 674         for x in /p/c/machine_specific/*.hosts; do
 675           if grep -qxF $tg $x; then
 676             dirs+=(${x%.hosts})
 677           fi
 678         done
 679         m rsync -aSAXPH --specials --devices --delete --relative ${dirs[@]} root@$tg:/
 680         ;;
 681     esac
 682   done
 683 fi
 684
 685 subvols=()
 686 for mp in "${mountpoints[@]}"; do
 687   subvols+=("${mp##*/}")
 688 done
 689 if [[ $source ]]; then
 690   m mount-latest-subvol "${subvols[@]}"
 691 else
 692   for tg in ${targets[@]}; do
 693     m /a/exe/mount-latest-remote "$tg" "${subvols[@]}" || ret=$?
 694   done
 695 fi
 696
 697 if [[ $ret == 0 ]]; then
 698   for tg in ${targets[@]}; do
 699     h=$(ssh $tg hostname)
 700     if [[ $h == kd && $HOSTNAME == x3 && $HOSTNAME == "$MAIL_HOST" ]]; then
 701       ssh root$tg systemctl --no-block start btrbk-spread
 702     fi
 703     rsync -a -f"- */" -f"+ *" /var/log/btrbk/ root@$tg:/var/log/btrbk/$tg
 704     ssh root@$tg /usr/local/bin/mail-backup-clean
 705   done
 706   if [[ $source ]]; then
 707     rsync -a -f"- */" -f"+ *" $source:/var/log/btrbk/ /var/log/btrbk/$source
 708   fi
 709 fi
 710
 711 mexit $ret
 712
 713 # todo: move variable data we don't care about backing up
 714 # to /nocow and symlink it.
 715
 716
 717 # background on btrbk timezones. with short/long, timestamps use local time.
 718 # for long, if your local time moves backwards, by moving timezones or
 719 # for an hour when daylight savings changes it, you will temporarily get
 720 # a more aggressive retention policy for the overlapping period, and
 721 # vice versa for the opposite timezone move. The alternative is using
 722 # long-iso, which puts timezone info into the timestamp, which means
 723 # that instead of shifting time, you shift the start of day/week/month
 724 # which is used for retention to your new local time, which means for
 725 # example, if you moved forward by 8 hours, the daily/weekly/monthly
 726 # retention will be 8 hours more aggressive since midnight is at a new
 727 # time, unless you fake the timzeone using the TZ env variable.
 728 # However, in the short term, there will be no inconsistencies.
 729 # I don't see any problem with shifting when the day starts for
 730 # retention, so I'm using long-iso.
 731
 732 # note to create a long-iso timestamp: date +%Y%m%dT%H%M%S%z