X-Git-Url: https://iankelling.org/git/?a=blobdiff_plain;f=btrbk-run;h=4642a708c1328198fb1cad6a66c5f75a8349dda2;hb=2b593e68820d1ed7911cecdbf495aff3749b15e3;hp=c59faf99c9eecb0e976a532bd6e2ef00225c59f7;hpb=82b146c2299fce1aec68d492e4bd881d81e8e6c9;p=distro-setup

diff --git a/btrbk-run b/btrbk-run
index c59faf9..4642a70 100755
--- a/btrbk-run
+++ b/btrbk-run
@@ -1,98 +1,104 @@
 #!/bin/bash
+# Copyright (C) 2016 Ian Kelling
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
 
 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
 }
 
-script_dir=$(dirname $(readlink "$BASH_SOURCE"))
+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=(/a)
+private_mountpoints=(/q)
+rsync_mountpoint=/q
 
 conf_only=false
 dry_run=false # mostly for testing
 resume_arg=
+do_i=true
+do_o=true
 
-temp=$(getopt -l help hcnrt: "$@") || usage 1
+temp=$(getopt -l help hcinoprt: "$@") || usage 1
 eval set -- "$temp"
 while true; do
     case $1 in
         -c) conf_only=true; shift ;;
+        -i) do_i=false; shift ;;
         -n) dry_run=true; dry_run_arg=-n; shift ;;
+        -o) do_o=false; shift ;;
+        -p) progress_arg="--progress"; shift ;;
+        # btrbk arg: Resume only. Skips snapshot creation.
         -r) resume_arg=-r; shift ;;
-        -t) IFS=, targets=($2); shift 2 ;;
+        -t) IFS=, targets=($2); unset IFS; shift 2 ;;
         -h|--help) usage ;;
         --) shift; break ;;
         *) echo "$0: Internal error!" ; exit 1 ;;
     esac
 done
-read primary <<<"$@"
 
-##### end command line parsing ########
-
-target-section() {
-    local root=$1
-    local subvol=$2
-    mountpoint $root &>/dev/null || return
-    cat >>/etc/btrbk.conf <<EOF
-volume $root
-subvolume $subvol
-$remote_target
+if $do_o; then
+    private_mountpoints+=(/o)
+fi
+read primary <<<"$@" # not yet used
 
-EOF
-}
+##### end command line parsing ########
 
 rsync-dirs() {
     local host=$1
     local path=$2
-    rsync $dry_run_arg -ahi --relative --delete "$path" "root@$host:/"
+    m rsync $dry_run_arg -ahi --relative --delete "$path" "root@$host:/"
 }
 
+vol-conf() {
+    cat >>/etc/btrbk.conf <<EOF
+volume $vol
+EOF
+}
+sub-conf() {
+    cat >>/etc/btrbk.conf <<EOF
+subvolume $sub
+EOF
+}
+tg-conf() {
+    cat >>/etc/btrbk.conf <<EOF
+target send-receive ssh://$tg$vol/btrbk
+EOF
+}
+m() { printf "%s: %s\n" "${0##*/}" "$*";  "$@"; }
 
-# note q is owned by root:1000
-# note p is owned 1000:1000 and chmod 700
-mountpoints=(/q)
-if awk '{print $2}' /etc/fstab | grep -xF /p &>/dev/null; then
-    mountpoints+=(/p)
-fi
-
-# if our mountpoints are from stale snapshots,
-# it doesn't make sense to do a backup.
-check-subvol-stale ${mountpoints[@]} || exit 1
 
-if [[ ! $targets ]]; then
-    case $HOSTNAME in
-        tp|x2)
-            if ! timeout -s 9 10 ssh frodo :; then
-                targets=($HOME_DOMAIN)
-            fi
-            ;;
-    esac
-    targets=(frodo)
+if ! which btrbk &>/dev/null; then
+    echo "$0: error: no btrbk binary found"
 fi
 
-
-# todo: make bash shell prompt show something when
-# a subvol on current host is not fresh.
-# 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
-# todo: setup lock so that if this is already running, we exit out, so
-# that manual runs don't interfere with cronjobs.
-
-for tg in ${targets[@]}; do
-    cat >/etc/btrbk.conf <<'EOF'
+cat >/etc/btrbk.conf <<'EOF'
 ssh_identity /root/.ssh/id_rsa
-transaction_syslog daemon
+# 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.
+# The man does not mention a way for them to be together, but
+# I dunno if setting a log level like warn might also output
+# transaction info.
+transaction_syslog local7
 
 # so we only run one at a time
 lockfile                   /var/lock/btrbk.lock
@@ -102,44 +108,111 @@ timestamp_format long-iso
 
 # only make a snapshot if things have changed
 snapshot_create onchange
-# much less snapshots because I have less space on the
-# local filesystem.
-#snapshot_preserve 2h 2d
-# for now, keeping them equal for simplicity sake
-snapshot_preserve 48h 14d 8w 24m
-snapshot_preserve_min 6h
+# I could make this different from target_preserve,
+# if one disk had less space.
+# for now, keeping them equal.
+snapshot_preserve 36h 14d 8w 24m
+snapshot_preserve_min 4h
 snapshot_dir btrbk
 
 # so, total backups = ~89
-target_preserve 48h 14d 8w 24m
-target_preserve_min 6h
+target_preserve 36h 14d 8w 24m
+target_preserve_min 4h
 
 # if something fails and it's not obvious, try doing
 # btrbk -l debug -v dryrun
 EOF
 
-    remote_target="target send-receive ssh://${tg}/mnt/root/btrbk"
+for mp in ${private_mountpoints[@]}; do # private mountpoints
+    if awk '{print $2}' /etc/fstab | grep -xF $mp &>/dev/null; then
+        mountpoints+=($mp)
+    fi
+done
+
+# if our mountpoints are from stale snapshots,
+# it doesn't make sense to do a backup.
+check-subvol-stale ${mountpoints[@]} || exit 1
+
+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.
+i_possible=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
-        target-section /mnt/iroot i
+        i_possible=true
     fi
-    for d in ${mountpoints[@]}; do
-        target-section /mnt/root ${d##*/}
+done
+if ! $i_possible; then
+    do_i=false
+fi
+
+
+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
+    vol=/mnt/iroot
+    vol-conf
+    sub=i
+    sub-conf
+    tg=frodo
+    vol=/mnt/root
+    tg-conf
+fi
+
+
+
+# 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
 fi
 
 if $dry_run; then
-    btrbk -n $resume_arg run
+    m btrbk -n $resume_arg run
 else
-    btrbk -q $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 $progress_arg $resume_arg run
 fi
 
-# if we have /p, rsync to targets without /p
-if mountpoint /p >/dev/null; then
+# 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)
@@ -155,15 +228,7 @@ if mountpoint /p >/dev/null; then
 fi
 
 if ! $dry_run; then
-    for tg in ${targets[@]}; do
-        scp $script_dir/{mount-latest-subvol,check-subvol-stale} \
-            root@$tg:/usr/local/bin
-        ssh root@$tg bash <<'EOF'
-set -e
-chmod +x /usr/local/bin/{mount-latest-subvol,check-subvol-stale}
-mount-latest-subvol
-EOF
-    done
+    m $script_dir/mount-latest-remote ${targets[@]}
 fi