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