# See the License for the specific language governing permissions and
# limitations under the License.
+
+# todo: if we cancel in the middle of a btrfs send, then run again immediately, the received subvolume doesn't get a Received UUID: field, and we won't mount it. Need to figure out a solution that will fix this.
+
set -eE -o pipefail
trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
[[ $EUID == 0 ]] || exec sudo -E "$BASH_SOURCE" "$@"
+
usage() {
- echo "top of script file:"
- sed -n '1,/^[# ]*end command line/{p;b};q' "$0"
- exit $1
+ echo "top of script file:"
+ sed -n '1,/^[# ]*end command line/{p;b};q' "$0"
+ exit $1
}
script_dir=$(dirname $(readlink -f "$BASH_SOURCE"))
-# todo: finish figuring out fai / distro-setup
-# initial fstab / subvol setup.
+# note q is owned by root:1000
+# note p/m is owned 1000:1000 and chmod 700
+
+
+mountpoints=()
+
+rsync_mountpoint=/q
conf_only=false
dry_run=false # mostly for testing
-resume_arg=
+rate_limit=no
+verbose=false
+
+default_args_file=/etc/btrbk-run.conf
+if [[ -s $default_args_file ]]; then
+ set -- $(< $default_args_file) "$@"
+fi
-temp=$(getopt -l help hcnprt: "$@") || usage 1
+temp=$(getopt -l help cl:m:npt:vh "$@") || usage 1
eval set -- "$temp"
while true; do
- case $1 in
- -c) conf_only=true; shift ;;
- -n) dry_run=true; dry_run_arg=-n; shift ;;
- -p) progress_arg="--progress"; shift ;;
- # btrbk arg: Resume only. Skips snapshot creation.
- -r) resume_arg=-r; shift ;;
- -t) IFS=, targets=($2); unset IFS; shift 2 ;;
- -h|--help) usage ;;
- --) shift; break ;;
- *) echo "$0: Internal error!" ; exit 1 ;;
- esac
+ case $1 in
+ # 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 ;;
+ # 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 ;;
+ *) echo "$0: Internal error!" ; exit 1 ;;
+ esac
done
-read primary <<<"$@"
+
+# usefull commands are resume and archive
+cmd_arg=${1:-run}
+
+if [[ -s $default_args_file ]]; then
+ echo "$0: warning: default btrbk-run options set in $default_args_file (sleeping 5 seconds):"
+ cat $default_args_file
+ sleep 5
+fi
+
+echo -e "$0: options: conf_only=$conf_only\ndry_run=$dry_run\nrate_limit=$rate_limit\nverbose=$verbose\ncmd_arg=$cmd_arg"
+
+# set default targets
+if [[ ! -v targets ]]; then
+ case $HOSTNAME in
+ x2|kw)
+ if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
+ targets=($HOME_DOMAIN)
+ fi
+ ;;
+ tp)
+ targets=(frodo)
+ if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
+ if timeout -s 9 10 ssh x2 :; then
+ targets+=(x2)
+ fi
+ fi
+ ;;
+ frodo)
+ targets=()
+ ;;
+ *)
+ echo "$0: error: no default targets for this host, use -t"
+ exit 1
+ ;;
+ esac
+fi
+
+echo "targets: ${targets[*]}"
+
+
+
+# set default mountpoints
+case $HOSTNAME in
+ frodo)
+ prospective_mps=(/i)
+ ;;
+ *)
+ prospective_mps=(/a /q)
+ if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
+ prospective_mps+=(/o)
+ fi
+ ;;
+esac
+case ${targets[0]} in
+ kw|kww)
+ prospective_mps=(/a)
+ ;;
+esac
+
+for mp in ${prospective_mps[@]}; do # default mountpoints to sync
+ if [[ -e /nocow/btrfs-stale/$mp ]]; then
+ echo "$0: 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
+
+echo "mountpoints: ${mountpoints[*]}"
##### end command line parsing ########
rsync-dirs() {
- local host=$1
- local path=$2
- m rsync $dry_run_arg -ahi --relative --delete "$path" "root@$host:/"
+ local host=$1
+ local path=$2
+ m rsync $dry_run_arg -ahi --relative --delete "$path" "root@$host:/"
}
vol-conf() {
- cat >>/etc/btrbk.conf <<EOF
+ cat >>/etc/btrbk.conf <<EOF
volume $vol
EOF
}
sub-conf() {
- cat >>/etc/btrbk.conf <<EOF
+ cat >>/etc/btrbk.conf <<EOF
subvolume $sub
EOF
}
tg-conf() {
- cat >>/etc/btrbk.conf <<EOF
+ cat >>/etc/btrbk.conf <<EOF
target send-receive ssh://$tg$vol/btrbk
EOF
}
if ! which btrbk &>/dev/null; then
- echo "$0: error: no btrbk binary found"
+ echo "$0: error: no btrbk binary found"
+ exit 1
fi
+# if our mountpoints are from stale snapshots,
+# it doesn't make sense to do a backup.
+check-subvol-stale ${mountpoints[@]} || exit 1
+
-cat >/etc/btrbk.conf <<'EOF'
-ssh_identity /root/.ssh/id_rsa
+cat >/etc/btrbk.conf <<EOF
+ssh_identity /root/.ssh/home
# Just a guess that local7 is a good facility to pick.
# It's a bit odd that the transaction log has to be logged to
# a file or syslog, while other output is sent to std out.
# transaction info.
transaction_syslog local7
+# 20%ish speedup[]
+stream_buffer 512m
+
# so we only run one at a time
lockfile /var/lock/btrbk.lock
# if something fails and it's not obvious, try doing
# btrbk -l debug -v dryrun
-EOF
-
-# note q is owned by root:1000
-# note p is owned 1000:1000 and chmod 700
-mountpoints=(/a)
-qmnt=/q
-if awk '{print $2}' /etc/fstab | grep -xF $qmnt &>/dev/null; then
- mountpoints+=($qmnt)
-fi
-# if our mountpoints are from stale snapshots,
-# it doesn't make sense to do a backup.
-check-subvol-stale ${mountpoints[@]} || exit 1
+rate_limit $rate_limit
+EOF
-if [[ ! $targets ]]; then
- case $HOSTNAME in
- tp|x2)
- if ! timeout -s 9 10 ssh frodo :; then
- targets=($HOME_DOMAIN)
- fi
- ;;
- treetowl)
- targets=(frodo)
- if timeout -s 9 10 ssh x2 :; then
- targets+=(x2)
- fi
- ;;
- *)
- targets=(frodo)
- ;;
- esac
- echo "targets: ${targets[*]}"
-fi
-# for i, we just do a 1 way sync from master to backup,
-# and manually manage any changes to that.
-do_i=false
for tg in ${targets[@]}; do
- # for an initial run, btrbk requires the dir to exist
- ssh root@$tg mkdir -p /mnt/root/btrbk
- if [[ $tg == frodo && $HOSTNAME == treetowl ]]; then
- do_i=true
- fi
+ # for an initial run, btrbk requires the dir to exist.
+ ssh root@$tg mkdir -p /mnt/root/btrbk
done
-vol=/mnt/root
-vol-conf
-for m in ${mountpoints[@]}; do
- sub=${m##*/}
- sub-conf
- for tg in ${targets[@]}; do
- tg-conf
- done
-done
-if $do_i; then
+for m in ${mountpoints[@]}; do
+ # for /i, some special cases. there is just one static target and direction.
+ if [[ $m == /i ]]; then
vol=/mnt/iroot
vol-conf
sub=i
tg=frodo
vol=/mnt/root
tg-conf
-fi
-
+ else
+ vol=/mnt/root
+ vol-conf
+ sub=${m##*/}
+ sub-conf
+ for tg in ${targets[@]}; do
+ tg-conf
+ done
+ fi
+done
# todo: umount first to ensure we don't have any errors
# todo: do some kill fuser stuff to make umount more reliable
-# todo: run this on a systemd timer on $primary, once per hour,
-# and if primary is, change that timer over to primary, and make
-# sure we mount the latest
-
if $conf_only; then
- exit
+ exit
fi
+
+
if $dry_run; then
- m btrbk -n $resume_arg run
+ m btrbk -v -n $cmd_arg
+elif [[ $cmd_arg == archive ]]; then
+ for tg in ${targets[@]}; do
+ m btrbk $verbose_arg $progress_arg $cmd_arg $vol ssh://$tg$vol
+ done
else
- # -q and just using the syslog option seemed nice,
- # but it doesn't show when a send has a parent and when it doesn't.
- m btrbk $progress_arg $resume_arg run
+ # -q and just using the syslog option seemed nice,
+ # but it doesn't show when a send has a parent and when it doesn't.
+ m btrbk $verbose_arg $progress_arg $cmd_arg
fi
-# if we have /p, rsync to targets without /p
-if mountpoint /p >/dev/null; then
- for tg in ${targets[@]}; do
- case $tg in
- tp|li|lk)
- for x in /p/c/machine_specific/*.hosts; do
- if grep -qxF $tg $x; then
- dir=${x%.hosts}
- rsync-dirs $tg $dir
- fi
- done
- ;;
- esac
- done
+# if we have it, sync to systems which don't
+if mountpoint $rsync_mountpoint >/dev/null; then
+ for tg in ${targets[@]}; do
+ case $tg in
+ tp|li|lk)
+ for x in /p/c/machine_specific/*.hosts; do
+ if grep -qxF $tg $x; then
+ dir=${x%.hosts}
+ rsync-dirs $tg $dir
+ fi
+ done
+ ;;
+ esac
+ done
fi
if ! $dry_run; then
- m $script_dir/mount-latest-remote ${targets[@]}
+ m $script_dir/mount-latest-remote ${targets[@]}
fi