#!/bin/bash
-set -x
-set -eE -o pipefail
-trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
-usage() {
- cat <<EOF
-Usage: ${0##*/} OLD_HOST NEW_HOST
+source /usr/local/lib/err
-Adjust home network dns so NEW_HOST resolves locally if it is on the
-local network. Turn off mail receiving on OLD_HOST, run btrbk to move
-mail to NEW_HOST, turn on mail receiving on NEW_HOST.
+usage() {
+ cat <<EOF
+Usage: ${0##*/} push|pull HOST
+Turn off mail receiving on OLD_HOST, run btrbk to move mail to NEW_HOST,
+turn on mail receiving on NEW_HOST. Assumes we want to move all
+filesystems unless passing -o.
+-o Only btrbk /o, instead of all filesystems.
-h|--help Print help and exit.
+I used to adjust home network dns so NEW_HOST resolves locally if it is
+on the local network, but its simpler just not to and just rely
+on the internet. Email can wait.
+
Note: Uses GNU getopt options parsing style
EOF
- exit $1
+ exit $1
+}
+
+restore_new_btrbk=false
+restore_old_btrbk=false
+cleanup() {
+ if $restore_new_btrbk; then
+ e WARNING: due to failure, btrbk.timer may need manual restoration:
+ e $new_shell sudo systemctl start btrbk.timer
+ fi
+ if $restore_old_btrbk; then
+ e WARNING: due to failure, btrbk.timer may need manual restoration:
+ e $old_shell sudo systemctl start btrbk.timer
+ fi
}
+b
+pre="${0##*/}:"
+m() { printf "$pre %s\n" "$*"; "$@"; }
+e() { printf "$pre %s\n" "$*"; }
+err() { echo "[$(date +'%Y-%m-%d %H:%M:%S%z')]: $pre: $*" >&2; }
##### begin command line parsing ########
-if (( $# != 2 )) || [[ $1 == -* || $2 == -* ]]; then
- usage 1
-fi
+temp=$(getopt -l help owh "$@") || usage 1
+mp_args="-m /o,/q,/a"
+eval set -- "$temp"
+while true; do
+ case $1 in
+ -o) mp_args="-m /o"; shift ;;
+ -h|--help) usage ;;
+ --) shift; break ;;
+ *) echo "$0: Internal error! unexpected args: $*" ; exit 1 ;;
+ esac
+done
-old_host=$1
-new_host=$2
-source /a/bin/bash_unpublished/source-semi-priv
-if [[ $old_host != $MAIL_HOST ]]; then
- read -p "warning: \$old_host != \$MAIL_HOST: $old_host != $MAIL_HOST, proceed? y/N "
- if [[ $REPLY != [yY] ]]; then
- exit 1
- fi
-fi
+(( $# == 2 )) || usage 1
+
-if [[ $new_host == "$HOSTNAME" ]]; then
- localhost_new=true
- new_shell=
-else
- localhost_new=false
+case $1 in
+ push)
+ new_host=$2
+ bbk_args="-s $old_host"
new_shell="ssh $new_host"
-fi
+ old_host=$HOSTNAME
+ ;;
+ pull)
+ old_host=$2
+ bbk_args="-t $new_host"
+ bbk_args="-s $old_host"
+ new_host=$HOSTNAME
+ old_shell="ssh $old_host"
+ ;;
+ *)
+ err invalid first argument
+ exit 1
+ ;;
+esac
-old_shell="ssh $old_host"
-if [[ $old_host == "$HOSTNAME" ]]; then
- old_shell=
-fi
-if [[ ! $new_host || ! $old_host ]]; then
- echo "$0: bad args. see script"
+source /a/bin/bash_unpublished/source-state
+
+if [[ $old_host != "$MAIL_HOST" ]]; then
+ read -r -p "warning: \$old_host != \$MAIL_HOST: $old_host != $MAIL_HOST, proceed? y/N "
+ if [[ $REPLY != [yY] ]]; then
exit 1
+ fi
fi
-at_home=false
-if [[ $HOSTNAME == treetowl ]] || [[ $HOSTNAME == frodo ]] || timeout -s 9 5 ssh wrt.b8.nz :; then
- at_home=true
-fi
-echo "$0: at_home = $at_home"
-
-source /a/bin/bash_unpublished/source-semi-priv
-#### begin convert private hostnames to public hostnames ####
-if ! $at_home; then
- for var in old_host new_host; do
- case ${!var} in
- treetowl)
- eval $var=$HOME_DOMAIN
- ;;
- esac
- done
-fi
-#### end convert private hostnames to public hostnames ####
-
-
-# because our port forward is not robust enough, we can't use proxy command,
-# todo: setup vpn so this is all taken care of.
-if ! $at_home; then
- if [[ $old_host == iank.vpn.office.fsf.org || $new_host == iank.vpn.office.fsf.org ]]; then
- wrt_shell="ssh iank.vpn.office.fsf.org ssh wrt.b8.nz"
- else
- wrt_shell="ssh $HOME_DOMAIN ssh wrt.b8.nz"
- fi
-else
- wrt_shell="ssh wrt.b8.nz"
+if [[ ! $new_host || ! $old_host ]]; then
+ echo "$0: bad args. see script"
+ exit 1
fi
-btrbk_test="systemctl is-active btrbk.service"
-while $new_shell $btrbk_test || $old_shell $btrbk_test; do
- echo "$0: btrbk is running on new or old host. sleeping for 8 seconds"
- sleep 6
- echo "$0: testing for btrbk activity in 2 seconds"
- sleep 2
-done
+e $new_shell hostname
+new_hostname=$($new_shell hostname)
########### end initial processing, begin actually modifying things ##########
-restore_new_btrbk=false
if $new_shell systemctl is-active btrbk.timer; then
- $new_shell sudo systemctl stop btrbk.timer
- restore_new_btrbk=true
+ m $new_shell sudo systemctl stop btrbk.timer
+ _errcatch_cleanup=cleanup
+ restore_new_btrbk=true
fi
-restore_old_btrbk=false
if $old_shell systemctl is-active btrbk.timer; then
- $old_shell sudo systemctl stop btrbk.timer
- restore_old_btrbk=true
-fi
-
-$new_shell bash -s <<'EOF'
-set -eE
-if mountpoint /m; then sudo umount /m; fi
-if mountpoint /o; then sudo umount /o; fi
-EOF
-
-# if new_host is not on home network, make mail.iankelling.org not resolve
-# on the home network.
-if [[ $new_host == $HOSTNAME ]] && ! $at_home; then
- echo | $wrt_shell cedit mail_host /etc/hosts || [[ $? == 1 ]] # 1 means file changed.
-else
- $wrt_shell bash -s <<EOFOUTER
- cedit mail_host /etc/hosts <<EOF || /etc/init.d/dnsmasq restart
-\$(grep "\b$new_host\b" /etc/hosts | awk '{print \$1}') mail.iankelling.org
-EOF
-EOFOUTER
+ m $old_shell sudo systemctl stop btrbk.timer
+ _errcatch_cleanup=cleanup
+ restore_old_btrbk=true
fi
-mail-setup() {
- shell="$1"
- $shell sed -ri "s/MAIL_HOST=.*/MAIL_HOST=$new_host/" /a/bin/bash_unpublished/source-semi-priv
- $shell /a/bin/distro-setup/mail-setup exim4
-}
-
-mail-setup "$old_shell"
-
-sudo dd of=/etc/btrbk.conf <<'EOF'
-ssh_identity /root/.ssh/id_rsa
-# 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
-
-# default format of short does not accomidate hourly preservation setting
-timestamp_format long-iso
-
-# only make a snapshot if things have changed
-snapshot_create onchange
-# 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 36h 14d 8w 24m
-target_preserve_min 4h
-
-# if something fails and it's not obvious, try doing
-# btrbk -l debug -v dryrun
+btrbk_test="systemctl is-active btrbk.service"
+while true; do
+ for shell in "$new_shell" "$old_shell"; do
+ e $shell $btrbk_test
+ status=$($shell $btrbk_test) ||:
+ case $status in
+ inactive|failed) : ;;
+ *)
+ e "btrbk active on shell:$shell, status:$status, sleeping 8 seconds"
+ sleep 8
+ continue
+ ;;
+ esac
+ done
+ break
+done
+# ensure these are unused before doing anything
+e "umounting /m and /o via $new_shell"
+$new_shell bash -xs <<'EOF'
+set -eE
+if mountpoint -q /m; then sudo umount /m; fi
+if mountpoint -q /o; then sudo umount /o; fi
EOF
-
-if $localhost_new; then
- btrbk_src=ssh://$old_host/mnt/root
- btrbk_dst=/mnt/root/btrbk
-else
- btrbk_src=/mnt/root
- btrbk_dst=ssh://$new_host/mnt/root/btrbk
+# previously, I was checking to see if the new mail host
+# is on my home network, then changing my home dns
+# to resolve on the local network, so that I didnt
+# have to send traffic out to the internet or rely
+# on that. However, that breaks for a laptop that roams.
+# So, we could have a cronjob that updates that dns,
+# however, another solution is to just use ipv6,
+# and I prefer that.
+#
+# TODO: enable ipv6 for email. exim config setting disables it.
+# need to add vpn support. need to add firewall / routing.
+# I think exim will try ipv6 first, so no need to disable
+# ipv6 i think.
+
+
+
+m $old_shell /a/exe/primary-setup $new_hostname
+
+if ! m btrbk-run -v $bbk_args $mp_args; then
+ ret=$?
+ bang="$(printf "$(tput setaf 5)█$(tput sgr0)%.0s" 1 2 3 4 5 6 7)"
+ e $bang failed btrbk. restoring old host as primary
+ m $old_shell /a/exe/primary-setup localhost
+ exit $ret
fi
-sudo tee -a /etc/btrbk.conf <<EOF
-volume $btrbk_src
-subvolume o
-target send-receive $btrbk_dst
-EOF
-
-
-sudo btrbk --progress run
-$new_shell mount-latest-subvol
-
-mail-setup
-
-if $restore_new_btrbk; then
- $new_shell sudo systemctl start btrbk.timer
-fi
-if $restore_old_btrbk; then
- $old_shell sudo systemctl start btrbk.timer
-fi
+m $new_shell /a/exe/primary-setup localhost
iankelling.org / git / distro-setup / blobdiff