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 if [[ $INVOCATION_ID ]]; then
  69   # INVOCATION_ID means running as a systemd service. we cant show progress in this case,
  70   # but if we pass the arg, it will insert mbuffer into the command.
  71   progress_arg=
  72 else
  73   progress_arg="--progress"
  74 fi
  75 incremental_strict=false
  76 pull_reexec=false
  77
  78 default_args_file=/etc/btrbk-run.conf
  79 if [[ -s $default_args_file ]]; then
  80   # shellcheck disable=SC2046 # we want word splitting
  81   set -- $(< $default_args_file) "$@"
  82   # i havent used this feature yet, so warn about it
  83   echo "$0: warning: default btrbk-run options set in $default_args_file (sleeping 5 seconds):"
  84   cat $default_args_file
  85   sleep 5
  86 fi
  87
  88 targets=()
  89 early=false
  90 cron=false
  91 fast=false
  92 kd_spread_maybe=false
  93 orig_args=("$@")
  94 temp=$(getopt -l cron,fast,pull-reexec,help 23ceikl:m:npqrs:t:vh "$@") || usage 1
  95 eval set -- "$temp"
  96 while true; do
  97   case $1 in
  98     # some behaviors specific to running under cron:
  99     # - skip hosts where xprintidle haven't been idle recently
 100     # - if we can't ssh to 1 or more hosts, still do the rest
 101     # - if we aren't MAIL_HOST and no -m or -s, just exit
 102     --cron)
 103       cron=true
 104       pre=
 105       ;;
 106     # for the rare case we want to run multiple instances at the same time
 107     -2) conf_suf=2 ;;
 108     -3) conf_suf=3 ;;
 109     # only creates the config file, does not run btrbk
 110     -c) conf_only=true ;;
 111     # quit early, just btrbk, no extra remounting etc.
 112     -e) early=true ;;
 113     # skip various checks. when we run twice in a row for
 114     # switch mail-host, no need to repeat the same checks again.
 115     --fast) fast=true ;;
 116     -i) incremental_strict=true ;;
 117     # note this implies resume
 118     -k) kd_spread_maybe=true ;;
 119     # bytes per second, suffix k m g
 120     -l) rate_limit=$2; shift ;;
 121     # Comma separated mountpoints to backup. This has defaults set below.
 122     -m) IFS=, mountpoints=($2); unset IFS; shift ;;
 123     -n) dry_run=true ;;
 124     # hide progress
 125     -p) progress_arg= ;;
 126     # internal option for rerunning under newer SOURCE_HOST version.
 127     --pull-reexec) pull_reexec=true;;
 128     # quiet
 129     -q) verbose=false; verbose_arg=; progress_arg= ;;
 130     # source host to receive a backup from
 131     -s)
 132       source=$2
 133       bbksource=$source
 134       if [[ $source == *:* ]]; then
 135         bbksource="[$source]"
 136       fi
 137       shift
 138       ;;
 139     # target hosts to send to. empty is valid for just doing local
 140     # snapshot. we have default hosts we will populate.
 141     -t) IFS=, targets=($2); unset IFS; shift ;;
 142     # verbose.
 143     -v) verbose=true; verbose_arg=-v ;;
 144     -h|--help) usage ;;
 145     --) shift; break ;;
 146     *) die "Internal error!" ;;
 147   esac
 148   shift
 149 done
 150
 151 cmd_arg="$1"
 152
 153 if $kd_spread_maybe; then
 154   if [[ $cmd_arg && $cmd_arg != resume ]]; then
 155     die "dont pass -k without resume or empty run arg"
 156   fi
 157   cmd_arg=resume
 158 fi
 159
 160 if [[ ! $cmd_arg ]]; then
 161   cmd_arg=run
 162 fi
 163
 164
 165 std_preserve="36h 14d 8w 24m"
 166 q_preserve="18h 14d 8w"
 167
 168 case $cmd_arg in
 169   run|resume) : ;;
 170
 171   # This works better than the normal archive command. We have to
 172   # specify the mount points, but that is what we are used to doing and
 173   # we prefer it. Another difference is that archive works recursively
 174   # and we don't care about that. Sometimes we may still want to run
 175   # btrbk archive, but it doesn't even use the config file, so just
 176   # run it directly, eg:
 177   # time s btrbk -v archive /mnt/r7/amy/boot/btrbk ssh://bo/mnt/boot2/btrbk
 178   archive)
 179     cmd_arg=resume
 180     std_preserve="999h 999d 999w 999m"
 181     q_preserve="$std_preserve"
 182     preserve_arg=-p
 183     ;;
 184   *) die "untested command arg" ;;
 185 esac
 186
 187 if (( $# > 1 )); then
 188   die: "only 1 nonoption arg is supported"
 189 fi
 190
 191 if [[ -v targets && $source ]]; then
 192   # note, this doesnt need to be the case, but
 193   # we would need to think about it.
 194   die "error: -t and -s are mutually exclusive"
 195 fi
 196
 197 ### end options parsing
 198
 199 # remove path from earlier version of btrbk
 200 rm -f /usr/sbin/btrbk
 201 # note, this still works as intended if there is no /usr/bin/btrbk
 202 if [[ /a/opt/btrbk/btrbk -nt /usr/bin/btrbk ]]; then
 203   if [[ -e /b/distro-functions/src/package-manager-abstractions ]]; then
 204     . /b/distro-functions/src/package-manager-abstractions
 205     pi asciidoctor
 206   fi
 207   cd /a/opt/btrbk
 208   m make install
 209 fi
 210
 211 # TODO: i wonder if there should be an option to send to the default
 212 # targets, plus any given on the command line.
 213
 214
 215
 216 kd_spread=false
 217 # set default targets
 218 if [[ ! -v targets && ! $source ]]; then
 219   if $cron; then
 220     if [[ $HOSTNAME != "$MAIL_HOST" ]]; then
 221       if $kd_spread_maybe && [[ $HOSTNAME == kd && $MAIL_HOST == x3 ]]; then
 222         if ping -q -c1 -w1 x3.office.fsf.org &>/dev/null; then
 223           work_host=x3.office.fsf.org
 224         elif ping -q -c1 -w1 x3wg.b8.nz &>/dev/null; then
 225           work_host=x3wg.b8.nz
 226         fi
 227         if [[ $work_host ]]; then
 228           source_state="$(ssh $work_host cat /a/bin/bash_unpublished/source-state)"
 229           eval "$source_state"
 230           if [[ $MAIL_HOST == x3 ]]; then
 231             kd_spread=true
 232           else
 233             # x3 was the mail host, but it moved to some other machine
 234             # without updating us yet.
 235             echo "MAIL_HOST=$MAIL_HOST, nothing to do"
 236             mexit 0
 237           fi
 238         else
 239           echo "MAIL_HOST=$MAIL_HOST, nothing to do"
 240           mexit 0
 241         fi
 242       else
 243         echo "MAIL_HOST=$MAIL_HOST, nothing to do"
 244         mexit 0
 245       fi
 246     fi
 247   fi
 248
 249   at_work=false
 250   at_home=false
 251
 252   case $HOSTNAME in
 253     kw|kd|frodo|x2|x3|sy) : ;;
 254     *)
 255       die "error: no default targets for this host, use -t"
 256       ;;
 257   esac
 258
 259   case $HOSTNAME in
 260     kw)
 261       at_work=true
 262       ;;&
 263     kd|frodo)
 264       at_home=true
 265       ;;&
 266     x2|x3|sy)
 267       if [[ $(dig +short @10.2.0.1 -x 10.2.0.2 2>&1 ||:) == kd.b8.nz. ]] \
 268            && ip n show 10.2.0.1 | grep . &>/dev/null; then
 269         at_home=true
 270       elif ping -q -c1 -w1 hal.office.fsf.org &>/dev/null \
 271           && ip n show 192.168.0.26 | grep . &>/dev/null; then
 272         at_work=true
 273       fi
 274       ;;&
 275     *)
 276       if $at_home; then
 277         if ! $kd_spread && [[ $HOSTNAME != x3 ]]; then
 278           # main work machine
 279           if ping -q -c1 -w1 x3.office.fsf.org &>/dev/null; then
 280             targets+=(x3.office.fsf.org)
 281           elif ping -q -c1 -w1 $h.b8.nz &>/dev/null; then
 282             # in case we took it home
 283             targets+=(x3.b8.nz)
 284           else
 285             targets+=(x3wg.b8.nz)
 286           fi
 287         fi
 288         # temporarily disabled while doing recovery
 289         #        for h in frodo kd; do
 290         for h in kd; do
 291           if [[ $HOSTNAME == "$h" ]]; then
 292             continue
 293           fi
 294           targets+=($h.b8.nz)
 295         done
 296         for h in x2 sy; do
 297           if [[ $HOSTNAME == "$h" ]]; then
 298             continue
 299           fi
 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         done
 306       elif $at_work; then
 307         targets+=(i.b8.nz)
 308         for h in x2 x3 kw; do
 309           if [[ $HOSTNAME == "$h" ]]; then
 310             continue
 311           fi
 312           if ping -q -c1 -w1 $h.office.fsf.org &>/dev/null; then
 313             targets+=($h.office.fsf.org)
 314           fi
 315         done
 316       else
 317         targets+=(i.b8.nz)
 318       fi
 319       ;;
 320   esac
 321 fi
 322
 323 if [[ ${mountpoints[0]} ]]; then
 324   for mp in ${mountpoints[@]}; do
 325     if [[ -e /nocow/btrfs-stale/$mp ]]; then
 326       die "error: $mp is stale, mount-latest-subvol first"
 327     fi
 328   done
 329 else
 330   # set default mountpoints
 331   if [[ ${targets[0]} == tp ]]; then
 332     prospective_mps=(/a)
 333   else
 334     case $HOSTNAME in
 335       *)
 336         prospective_mps=()
 337         if [[ $source ]]; then
 338           source_state="$(ssh $source cat /a/bin/bash_unpublished/source-state)"
 339           eval "$source_state"
 340           source_host="$(ssh $source cat /etc/hostname)"
 341           if [[ $source_host == "$MAIL_HOST" ]]; then
 342             prospective_mps+=(/o)
 343           fi
 344           if [[ $source_host == "$HOST2" ]]; then
 345             prospective_mps+=(/a /ar /qr /q)
 346           fi
 347         else
 348           if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
 349             prospective_mps+=(/o)
 350           fi
 351           if [[ $HOSTNAME == "$HOST2" ]]; then
 352             prospective_mps+=(/a /ar /qr /q)
 353           fi
 354           if $kd_spread; then
 355             prospective_mps=(/a /ar /o /qr /q)
 356           fi
 357         fi
 358         # note: put q last just in case its specific retention options were to
 359         # affect other config sections. I havent tested if that is the case.
 360         ;;
 361     esac
 362   fi
 363   for mp in ${prospective_mps[@]}; do # default mountpoints to sync
 364     if [[ -e /nocow/btrfs-stale/$mp ]]; then
 365       e "warning: $mp stale, not adding to default mountpoints"
 366       continue
 367     fi
 368     if awk '{print $2}' /etc/fstab | grep -xF $mp &>/dev/null; then
 369       mountpoints+=($mp)
 370     fi
 371   done
 372 fi
 373
 374 if (( ! ${#mountpoints[@]} )); then
 375   die didnt get mountpoint arg and had no defaults
 376 fi
 377
 378 ##### end command line parsing ########
 379
 380 #### begin pre-checks #####
 381
 382 # todo: this has a timing problem, since btrbk.timer could activate the service after this check.
 383 if ! $fast && [[ $source ]]; then
 384   if [[ $(ssh $source ps --no-headers -o comm 1) == systemd ]]; then
 385     status=$(ssh $source systemctl is-active btrbk.service) || : # normally returns 3
 386     case $status in
 387       inactive|failed) : ;;
 388       *)
 389         echo "$0: error: cron btrbk is running on source. exiting out of caution"
 390         mexit 1
 391     esac
 392   fi
 393 fi
 394
 395 if ! command -v btrbk &>/dev/null; then
 396   die "error: no btrbk binary found"
 397 fi
 398
 399
 400 #### end pre-checks #####
 401
 402 mkdir -p /var/log/btrbk
 403 # The journal doesnt go back to my oldest backups, and I've found myself
 404 # wanting older logs. Not going to bother expiring old logs, since it is
 405 # fine if they go back years.
 406 log_path=/var/log/btrbk/$(date +%F_%T%:::z).log
 407 echo copying output to $log_path
 408 exec &> >(ts "%F %T" | tee -a $log_path)
 409
 410
 411 if $verbose; then
 412   printf "$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"
 413 fi
 414
 415 if [[ -v targets ]]; then
 416   echo "targets: ${targets[*]}"
 417 fi
 418
 419 if [[ $source ]]; then
 420   echo "source: $source"
 421 fi
 422
 423 echo "mountpoints: ${mountpoints[*]}"
 424
 425
 426
 427 # pull_reexec stops us from getting into an infinite loop if there is some
 428 # kind of weird problem
 429 pulla=false
 430 for m in "${mountpoints[@]}"; do
 431   if [[ $m == /a ]]; then
 432     pulla=true
 433     break
 434   fi
 435 done
 436 if ! $pull_reexec && [[ $source ]] && $pulla ; then
 437   tmpf=$(mktemp)
 438   m rsync -ra $source:/usr/local/bin/{mount-latest-subvol,check-subvol-stale} /usr/local/bin
 439   m rsync -ra $source:/usr/local/lib/err /usr/local/lib
 440   m scp $source:/a/bin/distro-setup/btrbk-run $tmpf
 441   if ! diff -q $tmpf ${BASH_SOURCE[0]}; then
 442     e "found different version on host $source. reexecing"
 443     install -T $tmpf /usr/local/bin/btrbk-run
 444     m /usr/local/bin/btrbk-run --pull-reexec "${orig_args[@]}"
 445     mexit 0
 446   fi
 447 fi
 448
 449
 450 if ! $fast; then
 451   # if our mountpoints are from stale snapshots,
 452   # it doesn't make sense to do a backup.
 453   m check-subvol-stale ${mountpoints[@]} || die "found stale mountpoints in ${mountpoints[*]}"
 454
 455   # for an initial run, btrbk requires the dir to exist.
 456   mkdir -p /mnt/{root,o}/btrbk
 457 fi
 458 local_zone=$(date +%z)
 459
 460 if [[ $source ]]; then
 461   if $fast; then
 462     zone=$local_zone
 463   else
 464     if ! zone=$(ssh root@$source date +%z); then
 465       if $conf_only; then
 466         echo "$0: warning: failed to ssh to root@$source"
 467       else
 468         die failed to ssh to root@$source
 469       fi
 470     fi
 471     if [[ $zone != "$local_zone" ]]; then
 472       die "error: dont confuse yourself with multiple time zones. $h has different timezone than localhost"
 473     fi
 474   fi
 475 else
 476
 477   sshable=()
 478   sshfail=()
 479   for h in ${targets[@]}; do
 480     if $fast || $conf_only; then
 481       # Use some typical values in this case
 482       root_size=$(( 1024 * 1024 * 2000 )) #2tb
 483       percent_used=10
 484       zone=$(date +%z)
 485     elif remote_str=$(timeout -s 9 6 ssh root@$h "mkdir -p /mnt/root/btrbk /mnt/o/btrbk && date +%z && df --output=size,pcent / | tail -n1"); then
 486       mapfile -t tmp_array <<<"$remote_str"
 487       zone="${tmp_array[0]}"
 488       IFS=" " read -r root_size percent_used <<<"${tmp_array[1]}"
 489       percent_used=${percent_used%%%}
 490
 491       if (( ${#tmp_array[@]} != 2 )); then
 492         die "error: didnt get 2 lines in test ssh to target $h. investigate"
 493       fi
 494       case $percent_used in
 495         [0-9]|[1-9][0-9]) : ;;
 496         *)
 497           die "error: didnt get percent disk use in test ssh to target $h. investigate"
 498           ;;
 499       esac
 500     else
 501       sshfail+=($h)
 502       continue
 503     fi
 504
 505     # we may be booted into a bootstrap fs or something
 506     min_root_kb=$(( 1024 * 1024 * 200 )) # 200 gb
 507     if (( root_size < min_root_kb )); then
 508       continue
 509     fi
 510
 511     if (( percent_used >= 98 )); then
 512       die "error: filesystem on target $h is $percent_used % full"
 513     fi
 514
 515     # on sy, xprintidle is resetting every 12 seconds even when not
 516     # idle, i dunno why, instead we are checking if the screen is locked,
 517     # which is good enough.
 518     #
 519     # This is a separate ssh because the command can fail and thatis ok.
 520     if $cron; then
 521       locked=false
 522       if lock_info=$(timeout -s 9 6 ssh $h DISPLAY=:0 xscreensaver-command -time); then
 523         if [[ $lock_info != *non-blanked* ]]; then
 524           locked=true
 525         fi
 526       else
 527         locked=true
 528       fi
 529       if ! $locked; then
 530         # Ignore this host. i sometimes use a non-main machine for
 531         # testing or web browsing, knowing that everything will be wiped
 532         # by the next backup, but I dont want it to happen as Im using
 533         # it from cronjob.
 534         e "warning: $h: seems to be actively in use, skipping for now"
 535         continue
 536       fi
 537     fi
 538     sshable+=($h)
 539     if [[ $zone != "$local_zone" ]]; then
 540       die "error: dont confuse yourself with multiple time zones. $h has different timezone than localhost"
 541     fi
 542   done
 543   if [[ ! ${sshable[*]} ]] || { ! $cron && [[ ${sshfail[*]} ]]; }; then
 544     die "failed to ssh to hosts: ${sshfail[*]}"
 545   else
 546     if [[ ${sshfail[*]} ]]; then
 547       ret=1
 548       e "error: failed to ssh to ${sshfail[*]} but continuing with other hosts"
 549     fi
 550     targets=(${sshable[@]})
 551   fi
 552 fi
 553
 554
 555 cat >/etc/btrbk$conf_suf.conf <<EOF
 556 ssh_identity /q/root/h
 557 #ssh_identity /root/.ssh/home
 558
 559 # Just a guess that local7 is a good facility to pick.
 560 # It's a bit odd that the transaction log has to be logged to
 561 # a file or syslog, while other output is sent to std out.
 562 # The man does not mention a way for them to be together, but
 563 # I dunno if setting a log level like warn might also output
 564 # transaction info.
 565 transaction_syslog local7
 566
 567 # trying this out
 568 #stream_compress zstd
 569
 570 # so we only run one at a time
 571 lockfile                   /var/lock/btrbk$conf_suf.lock
 572
 573 # default format of short does not accomidate hourly preservation setting
 574 timestamp_format long-iso
 575
 576 # only make a snapshot if things have changed
 577 snapshot_create onchange
 578 # I could make this different from target_preserve,
 579 # if one disk had less space.
 580 # for now, keeping them equal.
 581 snapshot_preserve $std_preserve
 582 snapshot_preserve_min 6h
 583 snapshot_dir btrbk
 584 # so, total backups = ~58
 585 target_preserve $std_preserve
 586 target_preserve_min 6h
 587
 588 # i tried this when investigating: clone no source subvolume found error
 589 #incremental_prefs sro:1 srn:1 sao san:1 aro:1 arn:1
 590
 591 # if something fails and it's not obvious, try doing
 592 # btrbk -l debug -v dryrun
 593
 594 rate_limit $rate_limit
 595 EOF
 596
 597 if $incremental_strict; then
 598   cat >>/etc/btrbk$conf_suf.conf <<EOF
 599 incremental strict
 600 EOF
 601 fi
 602
 603 qconf() {
 604   case $sub in
 605     q)
 606       # q has sensitive data i dont want to backup for so long
 607       cat >>/etc/btrbk$conf_suf.conf <<EOF
 608 snapshot_preserve $q_preserve
 609 snapshot_preserve_min 2h
 610 snapshot_dir btrbk
 611 target_preserve $q_preserve
 612 target_preserve_min 2h
 613 EOF
 614       ;;
 615   esac
 616
 617 }
 618
 619 # make /q be last
 620 mp_count=${#mountpoints[@]}
 621 for (( i=0; i < mp_count - 1 ; i++ )); do
 622   if [[ ${mountpoints[i]} == /q ]]; then
 623     unset "mountpoints[i]"
 624     mountpoints+=(/q)
 625   fi
 626 done
 627
 628 for m in ${mountpoints[@]}; do
 629   case $m in
 630     /o)
 631       vol=/mnt/o
 632       ;;
 633     *)
 634       vol=/mnt/root
 635       ;;
 636   esac
 637
 638   sub=${m#/}
 639   if [[ $source ]]; then
 640     cat >>/etc/btrbk$conf_suf.conf <<EOF
 641 volume ssh://$bbksource$vol
 642 subvolume $sub
 643 EOF
 644     qconf
 645     cat >>/etc/btrbk$conf_suf.conf <<EOF
 646 target send-receive $vol/btrbk
 647 EOF
 648   fi
 649   if (( ${#targets[@]} )); then
 650     cat >>/etc/btrbk$conf_suf.conf <<EOF
 651 volume $vol
 652 subvolume $sub
 653 EOF
 654     qconf
 655     for tg in ${targets[@]}; do
 656       # handle ipv6
 657       if [[ $tg == *:* ]]; then
 658         tg="[$tg]"
 659       fi
 660       cat >>/etc/btrbk$conf_suf.conf <<EOF
 661 target send-receive ssh://$tg$vol/btrbk
 662 EOF
 663     done
 664   fi
 665 done
 666
 667 # todo: umount first to ensure we don't have any errors
 668 # todo: do some kill fuser stuff to make umount more reliable
 669
 670
 671 if $conf_only; then
 672   mexit 0
 673 fi
 674
 675
 676
 677 if $dry_run; then
 678   m btrbk -c /etc/btrbk$conf_suf.conf -v -n $cmd_arg
 679   mexit 0
 680 fi
 681 # -q and just using the syslog option seemed nice,
 682 # but it doesn't show when a send has a parent and when it doesn't.
 683 m btrbk -c /etc/btrbk$conf_suf.conf $preserve_arg $verbose_arg $progress_arg $cmd_arg
 684
 685 if $early; then
 686   exit 0
 687 fi
 688
 689 # todo: tp not valid anymore.
 690 # if we have it, sync to systems which don't
 691 if mountpoint $rsync_mountpoint >/dev/null; then
 692   for tg in ${targets[@]}; do
 693     case $tg in
 694       tp)
 695         dirs=(/p/c/machine_specific/tp)
 696         for x in /p/c/machine_specific/*.hosts; do
 697           if grep -qxF $tg $x; then
 698             dirs+=(${x%.hosts})
 699           fi
 700         done
 701         m rsync -aSAXPH --specials --devices --delete --relative ${dirs[@]} root@$tg:/
 702         ;;
 703     esac
 704   done
 705 fi
 706
 707 subvols=()
 708 for mp in "${mountpoints[@]}"; do
 709   subvols+=("${mp##*/}")
 710 done
 711 if [[ $source ]]; then
 712   m mount-latest-subvol "${subvols[@]}"
 713 else
 714   for tg in ${targets[@]}; do
 715     m /a/exe/mount-latest-remote "$tg" "${subvols[@]}" || ret=$?
 716   done
 717 fi
 718
 719 if [[ $ret == 0 ]]; then
 720   for tg in ${targets[@]}; do
 721     h=$(ssh root@$tg hostname)
 722     rsync -a /var/log/btrbk $tg:/var/log/btrbk/$tg
 723     ssh root@$tg /usr/local/bin/mail-backup-clean
 724   done
 725   if [[ $source ]]; then
 726     rsync -a $source:/var/log/btrbk /var/log/btrbk/$source
 727   fi
 728 fi
 729
 730 mexit $ret
 731
 732 # todo: move variable data we don't care about backing up
 733 # to /nocow and symlink it.
 734
 735
 736 # background on btrbk timezones. with short/long, timestamps use local time.
 737 # for long, if your local time moves backwards, by moving timezones or
 738 # for an hour when daylight savings changes it, you will temporarily get
 739 # a more aggressive retention policy for the overlapping period, and
 740 # vice versa for the opposite timezone move. The alternative is using
 741 # long-iso, which puts timezone info into the timestamp, which means
 742 # that instead of shifting time, you shift the start of day/week/month
 743 # which is used for retention to your new local time, which means for
 744 # example, if you moved forward by 8 hours, the daily/weekly/monthly
 745 # retention will be 8 hours more aggressive since midnight is at a new
 746 # time, unless you fake the timzeone using the TZ env variable.
 747 # However, in the short term, there will be no inconsistencies.
 748 # I don't see any problem with shifting when the day starts for
 749 # retention, so I'm using long-iso.
 750
 751 # note to create a long-iso timestamp: date +%Y%m%dT%H%M%S%z