4 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
8 Usage: ${0##*/} OLD_HOST NEW_HOST
10 Adjust home network dns so NEW_HOST resolves locally if it is on the
11 local network. Turn off mail receiving on OLD_HOST, run btrbk to move
12 mail to NEW_HOST, turn on mail receiving on NEW_HOST.
15 -h|--help Print help and exit.
17 Note: Uses GNU getopt options parsing style
22 ##### begin command line parsing ########
24 if (( $# != 2 )) ||
[[ $1 == -* ||
$2 == -* ]]; then
30 source /a
/bin
/bash_unpublished
/source-semi-priv
32 if [[ $old_host != $MAIL_HOST ]]; then
33 read -p "warning: \$old_host != \$MAIL_HOST: $old_host != $MAIL_HOST, proceed? y/N "
34 if [[ $REPLY != [yY
] ]]; then
39 if [[ $new_host == "$HOSTNAME" ]]; then
44 new_shell
="ssh $new_host"
47 old_shell
="ssh $old_host"
48 if [[ $old_host == "$HOSTNAME" ]]; then
52 if [[ ! $new_host ||
! $old_host ]]; then
53 echo "$0: bad args. see script"
58 if [[ $HOSTNAME == treetowl
]] ||
[[ $HOSTNAME == frodo
]] || timeout
-s 9 5 ssh wrt.b8.nz
:; then
61 echo "$0: at_home = $at_home"
63 source /a
/bin
/bash_unpublished
/source-semi-priv
64 #### begin convert private hostnames to public hostnames ####
66 for var
in old_host new_host
; do
69 eval $var=$HOME_DOMAIN
74 #### end convert private hostnames to public hostnames ####
77 # because our port forward is not robust enough, we can't use proxy command,
78 # todo: setup vpn so this is all taken care of.
80 if [[ $old_host == iank.vpn.office.fsf.org ||
$new_host == iank.vpn.office.fsf.org
]]; then
81 wrt_shell
="ssh iank.vpn.office.fsf.org ssh wrt.b8.nz"
83 wrt_shell
="ssh $HOME_DOMAIN ssh wrt.b8.nz"
86 wrt_shell
="ssh wrt.b8.nz"
89 btrbk_test
="systemctl is-active btrbk.service"
90 while $new_shell $btrbk_test ||
$old_shell $btrbk_test; do
91 echo "$0: btrbk is running on new or old host. sleeping for 8 seconds"
93 echo "$0: testing for btrbk activity in 2 seconds"
97 ########### end initial processing, begin actually modifying things ##########
99 restore_new_btrbk
=false
100 if $new_shell systemctl is-active btrbk.timer
; then
101 $new_shell sudo systemctl stop btrbk.timer
102 restore_new_btrbk
=true
104 restore_old_btrbk
=false
105 if $old_shell systemctl is-active btrbk.timer
; then
106 $old_shell sudo systemctl stop btrbk.timer
107 restore_old_btrbk
=true
110 $new_shell bash
-s <<'EOF'
112 if mountpoint /m; then sudo umount /m; fi
113 if mountpoint /o; then sudo umount /o; fi
116 # if new_host is not on home network, make mail.iankelling.org not resolve
117 # on the home network.
118 if [[ $new_host == $HOSTNAME ]] && ! $at_home; then
119 echo |
$wrt_shell cedit mail_host
/etc
/hosts ||
[[ $?
== 1 ]] # 1 means file changed.
121 $wrt_shell bash
-s <<EOFOUTER
122 cedit mail_host /etc/hosts <<EOF || /etc/init.d/dnsmasq restart
123 \$(grep "\b$new_host\b" /etc/hosts | awk '{print \$1}') mail.iankelling.org
130 $shell sed -ri "s/MAIL_HOST=.*/MAIL_HOST=$new_host/" /a
/bin
/bash_unpublished
/source-semi-priv
131 $shell /a
/bin
/distro-setup
/mail-setup exim4
134 mail-setup
"$old_shell"
136 sudo
dd of
=/etc
/btrbk.conf
<<'EOF'
137 ssh_identity /root/.ssh/id_rsa
138 # Just a guess that local7 is a good facility to pick.
139 # It's a bit odd that the transaction log has to be logged to
140 # a file or syslog, while other output is sent to std out.
141 # The man does not mention a way for them to be together, but
142 # I dunno if setting a log level like warn might also output
144 transaction_syslog local7
146 # so we only run one at a time
147 lockfile /var/lock/btrbk.lock
149 # default format of short does not accomidate hourly preservation setting
150 timestamp_format long-iso
152 # only make a snapshot if things have changed
153 snapshot_create onchange
154 # I could make this different from target_preserve,
155 # if one disk had less space.
156 # for now, keeping them equal.
157 snapshot_preserve 36h 14d 8w 24m
158 snapshot_preserve_min 4h
161 # so, total backups = ~89
162 target_preserve 36h 14d 8w 24m
163 target_preserve_min 4h
165 # if something fails and it's not obvious, try doing
166 # btrbk -l debug -v dryrun
172 if $localhost_new; then
173 btrbk_src
=ssh://$old_host/mnt
/root
174 btrbk_dst
=/mnt
/root
/btrbk
177 btrbk_dst
=ssh://$new_host/mnt
/root
/btrbk
180 sudo
tee -a /etc
/btrbk.conf
<<EOF
183 target send-receive $btrbk_dst
187 sudo btrbk
--progress run
188 $new_shell mount-latest-subvol
192 if $restore_new_btrbk; then
193 $new_shell sudo systemctl start btrbk.timer
195 if $restore_old_btrbk; then
196 $old_shell sudo systemctl start btrbk.timer