+dry_run=false # mostly for testing
+rate_limit=no
+verbose=true; verbose_arg=-v
+progress_arg="--progress"
+pull_reexec=false
+
+default_args_file=/etc/btrbk-run.conf
+if [[ -s $default_args_file ]]; then
+ set -- $(< $default_args_file) "$@"
+ # i havent used this feature yet, so warn about it
+ echo "$0: warning: default btrbk-run options set in $default_args_file (sleeping 5 seconds):"
+ cat $default_args_file
+ sleep 5
+fi
+
+cron=false
+orig_args=("$@")
+temp=$(getopt -l cron,pull-reexec,help cl:m:npqs:t:vh "$@") || usage 1
+eval set -- "$temp"
+while true; do
+ case $1 in
+ --cron)
+ cron=true
+ pre=
+ shift
+ ;;
+ # only creates the config file, does not run btrbk
+ -c) conf_only=true; shift ;;
+ # bytes per second, suffix k m g
+ -l) rate_limit=$2; shift 2 ;;
+ # Comma separated mountpoints to backup. This has defaults set below.
+ -m) IFS=, mountpoints=($2); unset IFS; shift 2 ;;
+ -n) dry_run=true; dry_run_arg=-n; shift ;;
+ -p) progress_arg="--progress"; shift ;;
+ --pull-reexec) pull_reexec=true; shift ;;
+ -q) verbose=false; verbose_arg=; progress_arg=; shift ;;
+ # source host to receive a backup from
+ -s) source=$2; shift 2 ;;
+ # target hosts to send to. empty is valid for just doing local
+ # snapshot. we have default hosts we will populate.
+ -t) IFS=, targets=($2); unset IFS; shift 2 ;;
+ -v) verbose=true; verbose_arg=-v; shift ;;
+ -h|--help) usage ;;
+ --) shift; break ;;
+ *) die "Internal error!" ;;
+ esac
+done
+
+# only tested commands are resume and archive
+cmd_arg=${1:-run}
+
+case $cmd_arg in
+ run|resume|archive) : ;;
+ *) die "untested command arg" ;;
+esac
+
+if (( $# > 1 )); then
+ die: "only 1 nonoption arg is supported"
+fi
+
+if [[ -v targets && $source ]]; then
+ die "error: -t and -s are mutually exclusive"
+fi
+
+if $verbose; then
+ printf "options: conf_only=%s\ndry_run=%s\nrate_limit=%s\nverbose=%s\ncmd_arg=%s" "$conf_only" "$dry_run" "$rate_limit" "$verbose" "$cmd_arg"
+fi
+### end options parsing
+
+# TODO: i wonder if there should be an option to send to the default
+# targets, plus any given on the command line.
+
+# set default targets
+if [[ ! -v targets && ! $source ]]; then
+ if [[ $HOSTNAME != "$MAIL_HOST" ]] && $cron ; then
+ echo "MAIL_HOST=$MAIL_HOST, nothing to do"
+ exit 0
+ fi
+ case $HOSTNAME in
+ kw|x2)
+ if ping -q -c1 -w1 iank.vpn.office.fsf.org &>/dev/null; then
+ home=iank.vpn.office.fsf.org
+ else
+ home=b8.nz
+ fi
+ ;;&
+ kw)
+ targets=($home x2)
+ ;;
+ x2)
+ targets=($home kw)
+ ;;
+ tp)
+ # kd disabled temporarily while its hot and i plan to work on it.
+ #targets=(frodo kd)
+ targets=(frodo x3.b8.nz)
+ # might not be connected to the vpn
+ if timeout -s 9 10 ssh kw :; then
+ targets+=(kw)
+ fi
+ ;;
+ kd)
+ targets=(frodo tp)
+ # might not be connected to the vpn
+ if timeout -s 9 10 ssh kw :; then
+ targets+=(kw)
+ fi
+ ;;
+ *)
+ die "error: no default targets for this host, use -t"
+ ;;
+ esac
+fi
+
+if [[ -v targets ]]; then
+ echo "targets: ${targets[*]}"
+fi
+
+if [[ $source ]]; then
+ echo "source: $source"
+fi
+
+
+if [[ $mountpoints ]]; then
+ for mp in ${mountpoints[@]}; do # default mountpoints to sync
+ if [[ -e /nocow/btrfs-stale/$mp ]]; then
+ die "error: $mp is stale, mount-latest-subvol first"
+ fi
+ done
+else
+ # set default mountpoints
+ case $HOSTNAME in
+ # no remote backups atm. note, if we do enable this, configuration below will need some changes.
+ # frodo)
+ # prospective_mps=(/i)
+ # ;;
+ *)
+ prospective_mps=(/a /q)
+ if [[ $source ]]; then
+ source_state="$(ssh $source cat /a/bin/bash_unpublished/source-state)"
+ eval "$source_state"
+ source_host="$(ssh $source cat /etc/hostname)"
+ if [[ $source_host == "$MAIL_HOST" ]]; then
+ prospective_mps+=(/o)
+ fi
+ else
+ if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
+ prospective_mps+=(/o)
+ fi
+ fi
+ ;;
+ esac
+ for mp in ${prospective_mps[@]}; do # default mountpoints to sync
+ if [[ -e /nocow/btrfs-stale/$mp ]]; then
+ e "warning: $mp stale, not adding to default mountpoints"
+ continue
+ fi
+ if awk '{print $2}' /etc/fstab | grep -xF $mp &>/dev/null; then
+ mountpoints+=($mp)
+ fi
+ done
+fi
+
+echo "mountpoints: ${mountpoints[*]}"
+
+##### end command line parsing ########
+
+if [[ $source ]]; then
+ if [[ $(ssh $source systemctl is-active btrbk.service) != inactive ]]; then
+ echo "$0: error: cron btrbk is running on source. exiting out of caution"
+ exit 1
+ fi
+fi
+
+# pull_reexec stops us from getting into an infinite loop if there is some
+# kind of weird problem
+pulla=false
+for m in "${mountpoints[@]}"; do
+ if [[ $m == /a ]]; then
+ pulla=true
+ break
+ fi
+done
+if ! $pull_reexec && [[ $source ]] && $pulla ; then
+ tmpf=$(mktemp)
+ scp $source:/a/bin/distro-setup/btrbk-run $tmpf
+ if ! diff -q $tmpf $BASH_SOURCE; then
+ e "found newer version on host $source. reexecing"
+ install -T $tmpf /usr/local/bin/btrbk-run
+ m /usr/local/bin/btrbk-run --pull-reexec "${orig_args[@]}"
+ exit
+ fi