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 $1
  39 }
  40
  41
  42 pre=btrbk-run
  43
  44 script_name="${BASH_SOURCE[0]}"
  45 script_name="${script_name##*/}"
  46 m() { if $verbose; then printf "$pre %s\n"  "$*"; fi;  "$@"; }
  47 e() { printf "$pre %s\n"  "$*"; }
  48 die() { printf "$pre error: %s\n" "$*" >&2; echo "$pre exiting with status 1" >&2; exit 1; }
  49 mexit() { echo "$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 $default_args_file
  86   sleep 5
  87 fi
  88
  89 targets=()
  90 early=false
  91 fast=false
  92 kd_spread=false
  93 check_installed=false
  94 orig_args=("$@")
  95 temp=$(getopt -l check-installed,fast,pull-reexec,help 23cefikl:m:npqrs:t:vh "$@") || usage 1
  96 eval set -- "$temp"
  97 while true; do
  98   case $1 in
  99     # for the rare case we want to run multiple instances at the same time
 100     -2) conf_suf=2 ;;
 101     -3) conf_suf=3 ;;
 102     # only creates the config file, does not run btrbk
 103     -c) conf_only=true ;;
 104     --check-installed)
 105       check_installed=true
 106       ;;
 107     # quit early, just btrbk, no extra remounting etc.
 108     -e) early=true ;;
 109     # avoids some default behaviors:
 110     # - no skipping hosts where xprintidle haven't been idle recently
 111     # - exit if we can't ssh to 1 or more hosts
 112     # - still set default hosts despite MAIL_HOST status
 113     -f) force=true ;;
 114     # skip various checks. when we run twice in a row for
 115     # switch mail-host, no need to repeat the same checks again.
 116     --fast) fast=true ;;
 117     -i) incremental_strict=true ;;
 118     # note this implies resume and -p
 119     -k) kd_spread=true ;;
 120     # bytes per second, suffix k m g
 121     -l) rate_limit=$2; shift ;;
 122     # Comma separated mountpoints to backup. This has defaults set below.
 123     -m) IFS=, mountpoints=($2); unset IFS; shift ;;
 124     -n) dry_run=true ;;
 125     # preserve existing snapshots and backups
 126     -p) preserve_arg=-p ;;
 127     # internal option for rerunning under newer SOURCE_HOST version.
 128     --pull-reexec) pull_reexec=true;;
 129     # quiet
 130     -q) verbose=false; verbose_arg=; progress_arg= ;;
 131     # source host to receive a backup from
 132     -s)
 133       source=$2
 134       bbksource=$source
 135       if [[ $source == *:* ]]; then
 136         bbksource="[$source]"
 137       fi
 138       shift
 139       ;;
 140     # target hosts to send to. empty is valid for just doing local
 141     # snapshot. we have default hosts we will populate.
 142     -t) IFS=, targets=($2); unset IFS; shift ;;
 143     # verbose.
 144     -v) verbose=true; verbose_arg=-v ;;
 145     -h|--help) usage ;;
 146     --) shift; break ;;
 147     *) die "Internal error!" ;;
 148   esac
 149   shift
 150 done
 151
 152 cmd_arg="$1"
 153
 154
 155 uninstalled-file-die() {
 156   die "uninstalled file $1. run install-my-scripts or rerun with -f"
 157 }
 158
 159 if ! $force && { $check_installed || [[ ! $source ]]; } ; then
 160   install_bin_files=(
 161     mount-latest-subvol
 162     check-subvol-stale
 163     btrbk-run
 164   )
 165   for f in ${install_bin_files[@]}; do
 166     if ! diff -q /a/bin/ds/$f /usr/local/bin/$f; then
 167       uninstalled-file-die $f
 168     fi
 169   done
 170   if ! diff -q /a/bin/errhandle/err /usr/local/lib/err; then
 171     uninstalled-file-die err
 172   fi
 173   if $check_installed; then
 174     exit 0
 175   fi
 176 fi
 177
 178
 179 if $kd_spread; then
 180   if [[ $cmd_arg && $cmd_arg != resume ]]; then
 181     die "dont pass -k without resume or empty run arg"
 182   fi
 183   if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
 184     die "something went wrong, -k not meant to be run on MAIL_HOST"
 185   fi
 186   if [[ $HOSTNAME != kd ]]; then
 187     die "something went wrong, -k only meant to run on kd"
 188   fi
 189   cmd_arg=resume
 190   preserve_arg=-p
 191   h=sy
 192   add-wireless-target-h
 193 fi
 194
 195 if [[ ! $cmd_arg ]]; then
 196   cmd_arg=run
 197 fi
 198
 199
 200 std_preserve="36h 14d 8w 24m"
 201 q_preserve="18h 14d 8w"
 202
 203 case $cmd_arg in
 204   run|resume) : ;;
 205
 206   # This works better than the normal archive command. We have to
 207   # specify the mount points, but that is what we are used to doing and
 208   # we prefer it. Another difference is that archive works recursively
 209   # and we don't care about that. Sometimes we may still want to run
 210   # btrbk archive, but it doesn't even use the config file, so just
 211   # run it directly, eg:
 212   # time s btrbk -v archive /mnt/r7/amy/boot/btrbk ssh://bo/mnt/boot2/btrbk
 213   archive)
 214     cmd_arg=resume
 215     std_preserve="999h 999d 999w 999m"
 216     q_preserve="$std_preserve"
 217     preserve_arg=-p
 218     ;;
 219   *) die "untested command arg" ;;
 220 esac
 221
 222 if (( $# > 1 )); then
 223   die: "only 1 nonoption arg is supported"
 224 fi
 225
 226 if [[ -v targets && $source ]]; then
 227   # note, this doesnt need to be the case, but
 228   # we would need to think about it.
 229   die "error: -t and -s are mutually exclusive"
 230 fi
 231
 232 ### end options parsing
 233
 234 # remove path from earlier version of btrbk
 235 rm -f /usr/sbin/btrbk
 236 # note, this still works as intended if there is no /usr/bin/btrbk
 237 if [[ /a/opt/btrbk/btrbk -nt /usr/bin/btrbk ]]; then
 238   if [[ -e /b/distro-functions/src/package-manager-abstractions ]]; then
 239     . /b/distro-functions/src/package-manager-abstractions
 240     pi asciidoctor
 241   fi
 242   cd /a/opt/btrbk
 243   m make install
 244 fi
 245
 246 # TODO: i wonder if there should be an option to send to the default
 247 # targets, plus any given on the command line.
 248
 249
 250 at_work=false
 251 at_home=false
 252
 253
 254 set-location() {
 255   case $HOSTNAME in
 256     kw)
 257       at_work=true
 258       ;;
 259     kd|frodo)
 260       at_home=true
 261       ;;
 262     x2|x3|sy)
 263       if [[ $(dig +short @10.2.0.1 -x 10.2.0.2 2>&1 ||:) == kd.b8.nz. ]] \
 264            && ip n show 10.2.0.1 | grep . &>/dev/null; then
 265         at_home=true
 266       elif ping -q -c1 -w1 hal.office.fsf.org &>/dev/null \
 267           && ip n show 192.168.0.26 | grep . &>/dev/null; then
 268         at_work=true
 269       fi
 270       ;;
 271   esac
 272 }
 273
 274 exit-if-no-default-targets() {
 275   if ! $force && [[ $HOSTNAME != "$MAIL_HOST" ]]; then
 276     echo "MAIL_HOST=$MAIL_HOST, nothing to do"
 277     mexit 0
 278   fi
 279   case $HOSTNAME in
 280     kw|kd|frodo|x2|x3|sy) : ;;
 281     *)
 282       die "error: no default targets for this host, use -t"
 283       ;;
 284   esac
 285 }
 286
 287 add-x3-target() {
 288   # main work machine
 289   if ping -q -c1 -w1 x3.office.fsf.org &>/dev/null; then
 290     targets+=(x3.office.fsf.org)
 291   elif ping -q -c1 -w1 $h.b8.nz &>/dev/null; then
 292     # in case we took it home
 293     targets+=(x3.b8.nz)
 294   else
 295     targets+=(x3wg.b8.nz)
 296   fi
 297 }
 298
 299 add-wireless-target-h() {
 300   if ping -q -c1 -w1 $h.b8.nz &>/dev/null; then
 301     targets+=($h.b8.nz)
 302   elif ping -q -c1 -w1 ${h}w.b8.nz &>/dev/null; then
 303     targets+=(${h}w.b8.nz)
 304   fi
 305 }
 306
 307
 308 # set default targets
 309 if [[ ! -v targets && ! $source ]]; then
 310   exit-if-no-default-targets
 311   set-location
 312   if $at_home; then
 313     if ! $kd_spread && [[ $HOSTNAME != x3 ]]; then
 314       add-x3-target
 315     fi
 316     if [[ $HOSTNAME != kd ]]; then
 317       targets+=(kd.b8.nz)
 318     fi
 319     wireless_home_hosts=(
 320       x2
 321       sy
 322     )
 323     for h in ${wireless_home_hosts[@]}; do
 324       if [[ $HOSTNAME != "$h" ]]; then
 325         add-wireless-target-h
 326       fi
 327     done
 328   elif $at_work; then
 329     targets+=(i.b8.nz)
 330     for h in x2 x3 kw; do
 331       if [[ $HOSTNAME == "$h" ]]; then
 332         continue
 333       fi
 334       if ping -q -c1 -w1 $h.office.fsf.org &>/dev/null; then
 335         targets+=($h.office.fsf.org)
 336       fi
 337     done
 338   else
 339     targets+=(i.b8.nz)
 340   fi
 341 fi
 342
 343 if [[ ${mountpoints[0]} ]]; then
 344   for mp in ${mountpoints[@]}; do
 345     if [[ -e /nocow/btrfs-stale/$mp ]]; then
 346       die "error: $mp is stale, mount-latest-subvol first"
 347     fi
 348   done
 349 else
 350   # set default mountpoints
 351   if [[ ${targets[0]} == tp ]]; then
 352     prospective_mps=(/a)
 353   else
 354     case $HOSTNAME in
 355       *)
 356         prospective_mps=()
 357         if [[ $source ]]; then
 358           source_state="$(ssh $source cat /a/bin/bash_unpublished/source-state)"
 359           eval "$source_state"
 360           source_host="$(ssh $source cat /etc/hostname)"
 361           if [[ $source_host == "$MAIL_HOST" ]]; then
 362             prospective_mps+=(/o)
 363           fi
 364           if [[ $source_host == "$HOST2" ]]; then
 365             prospective_mps+=(/a /ar /qr /qd /q)
 366           fi
 367         else
 368           if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
 369             prospective_mps+=(/o)
 370           fi
 371           if [[ $HOSTNAME == "$HOST2" ]]; then
 372             prospective_mps+=(/a /ar /qr /qd /q)
 373           fi
 374           if $kd_spread; then
 375             prospective_mps=(/a /ar /o /qr /qd /q)
 376           fi
 377         fi
 378         # note: put q last just in case its specific retention options were to
 379         # affect other config sections. I havent tested if that is the case.
 380         ;;
 381     esac
 382   fi
 383   for mp in ${prospective_mps[@]}; do # default mountpoints to sync
 384     if [[ -e /nocow/btrfs-stale/$mp ]]; then
 385       e "warning: $mp stale, not adding to default mountpoints"
 386       continue
 387     fi
 388     if awk '{print $2}' /etc/fstab | grep -xF $mp &>/dev/null; then
 389       mountpoints+=($mp)
 390     fi
 391   done
 392 fi
 393
 394 if (( ! ${#mountpoints[@]} )); then
 395   die didnt get mountpoint arg and had no defaults
 396 fi
 397
 398 ##### end command line parsing ########
 399
 400 #### begin pre-checks #####
 401
 402 # todo: this has a timing problem, since btrbk.timer could activate the service after this check.
 403 if ! $fast && [[ $source ]]; then
 404   if [[ $(ssh $source ps --no-headers -o comm 1) == systemd ]]; then
 405     status=$(ssh $source systemctl is-active btrbk.service) || : # normally returns 3
 406     case $status in
 407       inactive|failed) : ;;
 408       *)
 409         echo "$0: error: btrbk is running on source. exiting out of caution"
 410         mexit 1
 411     esac
 412   fi
 413 fi
 414
 415 if ! command -v btrbk &>/dev/null; then
 416   die "error: no btrbk binary found"
 417 fi
 418
 419 if ! $pull_reexec && [[ $source ]] && $pulla && ! $force ; then
 420   ssh root@$source btrbk-run --check-installed || exit 1
 421 fi
 422
 423 #### end pre-checks #####
 424
 425
 426
 427 mkdir -p /var/log/btrbk
 428 # The journal doesnt go back to my oldest backups, and I've found myself
 429 # wanting older logs. Not going to bother expiring old logs, since it is
 430 # fine if they go back years.
 431 log_path=/var/log/btrbk/$(date +%F_%T%:::z).log
 432 echo copying output to $log_path
 433 exec &> >(pee cat 'ts "%F %T"|dd of='$log_path' status=none')
 434
 435
 436 if $verbose; then
 437   printf " options: conf_only=%s\ndry_run=%s\nrate_limit=%s\nverbose=%s\ncmd_arg=%s" "$conf_only" "$dry_run" "$rate_limit" "$verbose" "$cmd_arg"
 438 fi
 439
 440 if [[ -v targets ]]; then
 441   echo "targets: ${targets[*]}"
 442 fi
 443
 444 if [[ $source ]]; then
 445   echo "source: $source"
 446 fi
 447
 448 echo "mountpoints: ${mountpoints[*]}"
 449
 450
 451
 452
 453 # pull_reexec stops us from getting into an infinite loop if there is some
 454 # kind of weird problem
 455 pulla=false
 456 for m in "${mountpoints[@]}"; do
 457   if [[ $m == /a ]]; then
 458     pulla=true
 459     break
 460   fi
 461 done
 462
 463 if ! $pull_reexec && [[ $source ]] && $pulla ; then
 464   tmpf=$(mktemp)
 465   m rsync -ra $source:/usr/local/bin/{mount-latest-subvol,check-subvol-stale} /usr/local/bin
 466   m rsync -ra $source:/usr/local/lib/err /usr/local/lib
 467   m scp $source:/a/bin/distro-setup/btrbk-run $tmpf
 468   if ! diff -q $tmpf ${BASH_SOURCE[0]}; then
 469     e "found different version on host $source. reexecing"
 470     install -T $tmpf /usr/local/bin/btrbk-run
 471     m /usr/local/bin/btrbk-run --pull-reexec "${orig_args[@]}"
 472     mexit 0
 473   fi
 474 fi
 475
 476
 477 if ! $fast; then
 478   # if our mountpoints are from stale snapshots,
 479   # it doesn't make sense to do a backup.
 480   m check-subvol-stale ${mountpoints[@]} || die "found stale mountpoints in ${mountpoints[*]}"
 481
 482   # for an initial run, btrbk requires the dir to exist.
 483   mkdir -p /mnt/{root,o}/btrbk
 484 fi
 485 local_zone=$(date +%z)
 486
 487 if [[ $source ]]; then
 488   if $fast; then
 489     zone=$local_zone
 490   else
 491     if ! zone=$(ssh root@$source date +%z); then
 492       if $conf_only; then
 493         echo "$0: warning: failed to ssh to root@$source"
 494       else
 495         die failed to ssh to root@$source
 496       fi
 497     fi
 498     if [[ $zone != "$local_zone" ]]; then
 499       die "error: dont confuse yourself with multiple time zones. $h has different timezone than localhost"
 500     fi
 501   fi
 502 else
 503
 504   sshable=()
 505   sshfail=()
 506   for h in ${targets[@]}; do
 507     if $fast || $conf_only; then
 508       # Use some typical values in this case
 509       root_size=$(( 1024 * 1024 * 2000 )) #2tb
 510       percent_used=10
 511       zone=$(date +%z)
 512     elif remote_str=$(timeout -s 9 6 ssh root@$h "mkdir -p /mnt/root/btrbk /mnt/o/btrbk && date +%z && df --output=size,pcent / | tail -n1"); then
 513       mapfile -t tmp_array <<<"$remote_str"
 514       zone="${tmp_array[0]}"
 515       IFS=" " read -r root_size percent_used <<<"${tmp_array[1]}"
 516       percent_used=${percent_used%%%}
 517
 518       if (( ${#tmp_array[@]} != 2 )); then
 519         die "error: didnt get 2 lines in test ssh to target $h. investigate"
 520       fi
 521       case $percent_used in
 522         [0-9]|[1-9][0-9]) : ;;
 523         *)
 524           die "error: didnt get percent disk use in test ssh to target $h. investigate"
 525           ;;
 526       esac
 527     else
 528       sshfail+=($h)
 529       continue
 530     fi
 531
 532     # we may be booted into a bootstrap fs or something
 533     min_root_kb=$(( 1024 * 1024 * 200 )) # 200 gb
 534     if (( root_size < min_root_kb )); then
 535       continue
 536     fi
 537
 538     if (( percent_used >= 98 )); then
 539       die "error: filesystem on target $h is $percent_used % full"
 540     fi
 541
 542     # on sy, xprintidle is resetting every 12 seconds even when not
 543     # idle, i dunno why, instead we are checking if the screen is locked,
 544     # which is good enough.
 545     #
 546     # This is a separate ssh because the command can fail and thatis ok.
 547     if ! $force; then
 548       locked=false
 549       if lock_info=$(timeout -s 9 6 ssh $h DISPLAY=:0 xscreensaver-command -time); then
 550         if [[ $lock_info != *non-blanked* ]]; then
 551           locked=true
 552         fi
 553       else
 554         locked=true
 555       fi
 556       if ! $locked; then
 557         # Ignore this host. i sometimes use a non-main machine for
 558         # testing or web browsing, knowing that everything will be wiped
 559         # by the next backup, but I dont want it to happen as Im using
 560         # it from cronjob.
 561         e "warning: $h: seems to be actively in use, skipping for now"
 562         continue
 563       fi
 564     fi
 565     sshable+=($h)
 566     if [[ $zone != "$local_zone" ]]; then
 567       die "error: dont confuse yourself with multiple time zones. $h has different timezone than localhost"
 568     fi
 569   done
 570   if [[ ! ${sshable[*]} ]] || { $force && [[ ${sshfail[*]} ]]; }; then
 571     die "failed to ssh to hosts: ${sshfail[*]}"
 572   else
 573     if [[ ${sshfail[*]} ]]; then
 574       ret=1
 575       e "error: failed to ssh to ${sshfail[*]} but continuing with other hosts"
 576     fi
 577     targets=(${sshable[@]})
 578   fi
 579 fi
 580
 581
 582 cat >/etc/btrbk$conf_suf.conf <<EOF
 583 ssh_identity /q/root/h
 584 #ssh_identity /root/.ssh/home
 585
 586 # Just a guess that local7 is a good facility to pick.
 587 # It's a bit odd that the transaction log has to be logged to
 588 # a file or syslog, while other output is sent to std out.
 589 # The man does not mention a way for them to be together, but
 590 # I dunno if setting a log level like warn might also output
 591 # transaction info.
 592 transaction_syslog local7
 593
 594 # trying this out
 595 #stream_compress zstd
 596
 597 # so we only run one at a time
 598 lockfile                   /var/lock/btrbk$conf_suf.lock
 599
 600 # default format of short does not accomidate hourly preservation setting
 601 timestamp_format long-iso
 602
 603 # only make a snapshot if things have changed
 604 snapshot_create onchange
 605 # I could make this different from target_preserve,
 606 # if one disk had less space.
 607 # for now, keeping them equal.
 608 snapshot_preserve $std_preserve
 609 snapshot_preserve_min 6h
 610 snapshot_dir btrbk
 611 # so, total backups = ~58
 612 target_preserve $std_preserve
 613 target_preserve_min 6h
 614
 615 # i tried this when investigating: clone no source subvolume found error
 616 #incremental_prefs sro:1 srn:1 sao san:1 aro:1 arn:1
 617
 618 # if something fails and it's not obvious, try doing
 619 # btrbk -l debug -v dryrun
 620
 621 rate_limit $rate_limit
 622 EOF
 623
 624 if $incremental_strict; then
 625   cat >>/etc/btrbk$conf_suf.conf <<EOF
 626 incremental strict
 627 EOF
 628 fi
 629
 630 qconf() {
 631   case $sub in
 632     q)
 633       # q has sensitive data i dont want to backup for so long
 634       cat >>/etc/btrbk$conf_suf.conf <<EOF
 635 snapshot_preserve $q_preserve
 636 snapshot_preserve_min 2h
 637 snapshot_dir btrbk
 638 target_preserve $q_preserve
 639 target_preserve_min 2h
 640 EOF
 641       ;;
 642   esac
 643
 644 }
 645
 646 # make /q be last
 647 mp_count=${#mountpoints[@]}
 648 for (( i=0; i < mp_count - 1 ; i++ )); do
 649   if [[ ${mountpoints[i]} == /q ]]; then
 650     unset "mountpoints[i]"
 651     mountpoints+=(/q)
 652   fi
 653 done
 654
 655 for m in ${mountpoints[@]}; do
 656   case $m in
 657     /o)
 658       vol=/mnt/o
 659       ;;
 660     *)
 661       vol=/mnt/root
 662       ;;
 663   esac
 664
 665   sub=${m#/}
 666   if [[ $source ]]; then
 667     cat >>/etc/btrbk$conf_suf.conf <<EOF
 668 volume ssh://$bbksource$vol
 669 subvolume $sub
 670 EOF
 671     qconf
 672     cat >>/etc/btrbk$conf_suf.conf <<EOF
 673 target send-receive $vol/btrbk
 674 EOF
 675   fi
 676   if (( ${#targets[@]} )); then
 677     cat >>/etc/btrbk$conf_suf.conf <<EOF
 678 volume $vol
 679 subvolume $sub
 680 EOF
 681     qconf
 682     for tg in ${targets[@]}; do
 683       # handle ipv6
 684       if [[ $tg == *:* ]]; then
 685         tg="[$tg]"
 686       fi
 687       cat >>/etc/btrbk$conf_suf.conf <<EOF
 688 target send-receive ssh://$tg$vol/btrbk
 689 EOF
 690     done
 691   fi
 692 done
 693
 694 # todo: umount first to ensure we don't have any errors
 695 # todo: do some kill fuser stuff to make umount more reliable
 696
 697
 698 if $conf_only; then
 699   mexit 0
 700 fi
 701
 702
 703
 704 if $dry_run; then
 705   m btrbk -c /etc/btrbk$conf_suf.conf -v -n $cmd_arg
 706   mexit 0
 707 fi
 708 # -q and just using the syslog option seemed nice,
 709 # but it doesn't show when a send has a parent and when it doesn't.
 710 m btrbk -c /etc/btrbk$conf_suf.conf $preserve_arg $verbose_arg $progress_arg $cmd_arg
 711
 712 if $early; then
 713   exit 0
 714 fi
 715
 716 # todo: tp not valid anymore.
 717 # if we have it, sync to systems which don't
 718 if mountpoint $rsync_mountpoint >/dev/null; then
 719   for tg in ${targets[@]}; do
 720     case $tg in
 721       tp)
 722         dirs=(/p/c/machine_specific/tp)
 723         for x in /p/c/machine_specific/*.hosts; do
 724           if grep -qxF $tg $x; then
 725             dirs+=(${x%.hosts})
 726           fi
 727         done
 728         m rsync -aSAXPH --specials --devices --delete --relative ${dirs[@]} root@$tg:/
 729         ;;
 730     esac
 731   done
 732 fi
 733
 734 subvols=()
 735 for mp in "${mountpoints[@]}"; do
 736   subvols+=("${mp##*/}")
 737 done
 738 if [[ $source ]]; then
 739   m mount-latest-subvol "${subvols[@]}"
 740 else
 741   for tg in ${targets[@]}; do
 742     m /a/exe/mount-latest-remote "$tg" "${subvols[@]}" || ret=$?
 743   done
 744 fi
 745
 746 if [[ $ret == 0 ]]; then
 747   for tg in ${targets[@]}; do
 748     h=$(ssh $tg hostname)
 749     if [[ $h == kd && $HOSTNAME == x3 && $HOSTNAME == "$MAIL_HOST" ]]; then
 750       ssh root$tg systemctl --no-block start btrbk-spread
 751     fi
 752     rsync -a -f"- */" -f"+ *" /var/log/btrbk/ root@$tg:/var/log/btrbk/$tg
 753     ssh root@$tg /usr/local/bin/mail-backup-clean
 754   done
 755   if [[ $source ]]; then
 756     rsync -a -f"- */" -f"+ *" $source:/var/log/btrbk/ /var/log/btrbk/$source
 757   fi
 758 fi
 759
 760 mexit $ret
 761
 762 # todo: move variable data we don't care about backing up
 763 # to /nocow and symlink it.
 764
 765
 766 # background on btrbk timezones. with short/long, timestamps use local time.
 767 # for long, if your local time moves backwards, by moving timezones or
 768 # for an hour when daylight savings changes it, you will temporarily get
 769 # a more aggressive retention policy for the overlapping period, and
 770 # vice versa for the opposite timezone move. The alternative is using
 771 # long-iso, which puts timezone info into the timestamp, which means
 772 # that instead of shifting time, you shift the start of day/week/month
 773 # which is used for retention to your new local time, which means for
 774 # example, if you moved forward by 8 hours, the daily/weekly/monthly
 775 # retention will be 8 hours more aggressive since midnight is at a new
 776 # time, unless you fake the timzeone using the TZ env variable.
 777 # However, in the short term, there will be no inconsistencies.
 778 # I don't see any problem with shifting when the day starts for
 779 # retention, so I'm using long-iso.
 780
 781 # note to create a long-iso timestamp: date +%Y%m%dT%H%M%S%z