#!/bin/bash
-set -x
-set -eE -o pipefail
-trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
+
+source /usr/local/lib/err
usage() {
cat <<EOF
-Usage: ${0##*/} OLD_HOST NEW_HOST
+Usage: ${0##*/} push|pull HOST
-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.
+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.
--w Don't try to ssh to wrt. Should only be used in unusual network situation.
+-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
}
+restore_new_btrbk=false
+restore_old_btrbk=false
+err-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 $old_shell sudo systemctl start btrbk.timer
+ fi
+}
+
+pre="${0##*/}:"
+m() { printf "$pre %s\n" "$*"; "$@"; }
+e() { printf "$pre %s\n" "$*"; }
+err() { echo "$pre ERROR: $*" >&2; }
+mexit() { echo "$pre exiting with status $1"; exit $1; }
+
##### begin command line parsing ########
-update_wrt=true # default
-temp=$(getopt -l help wh "$@") || usage 1
+force=false
+mp_args="-m /o,/q,/a"
+temp=$(getopt -l force,help owh "$@") || usage 1
eval set -- "$temp"
while true; do
case $1 in
- -w) update_wrt=false; shift ;;
+ --force) force=true ;;
+ -o) mp_args="-m /o"; shift ;;
-h|--help) usage ;;
--) shift; break ;;
- *) echo "$0: Internal error! unexpected args: $*" ; exit 1 ;;
+ *) echo "$0: Internal error! unexpected args: $*" ; mexit 1 ;;
esac
done
(( $# == 2 )) || usage 1
-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
+if [[ ! $HOSTNAME ]]; then
+ err '$HOSTNAME is unset'
+ mexit 1
fi
-if [[ $new_host == "$HOSTNAME" ]]; then
- localhost_new=true
- new_shell=
-else
- localhost_new=false
- new_shell="ssh $new_host"
-fi
-
-old_shell="ssh $old_host"
-if [[ $old_host == "$HOSTNAME" ]]; then
- old_shell=
+case $1 in
+ push)
+ old_host=$HOSTNAME
+ old_hostname=$HOSTNAME
+ new_host=$2
+ bbk_args="-t $new_host"
+ new_shell="ssh $new_host"
+ new_hostname=$($new_shell hostname)
+ ;;
+ pull)
+ old_host=$2
+ new_host=$HOSTNAME
+ new_hostname=$HOSTNAME
+ bbk_args="-s $old_host"
+ old_shell="ssh $old_host"
+ # tests ssh connection
+ old_hostname=$($old_shell hostname)
+ ;;
+ *)
+ err invalid first argument
+ mexit 1
+ ;;
+esac
+
+source /a/bin/bash_unpublished/source-state
+
+if [[ $old_hostname != "$MAIL_HOST" ]] && ! $force; then
+ err "\$old_hostname($old_hostname) != \$MAIL_HOST($MAIL_HOST). Rerun with --force if you really want this."
+ mexit 1
fi
if [[ ! $new_host || ! $old_host ]]; then
echo "$0: bad args. see script"
- exit 1
+ mexit 1
fi
-at_home=false
-if [[ $HOSTNAME == tp ]] || [[ $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
-# tp)
-# 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 ! $update_wrt; then
- wrt_shell=:
-elif $at_home; then
- wrt_shell="ssh wrt.b8.nz"
-else
- 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
-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 "$0: testing for btrbk activity in 2 seconds"
- sleep 2
-done
-
-new_hostname=$($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
+ m $new_shell sudo systemctl stop btrbk.timer
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
+ m $old_shell sudo systemctl stop btrbk.timer
restore_old_btrbk=true
fi
+btrbk_test="systemctl is-active btrbk.service"
+active=true
+while $active; do
+ active=false
+ for shell in "$new_shell" "$old_shell"; do
+ e $shell $btrbk_test
+ status=$($shell $btrbk_test) ||:
+ case $status in
+ inactive|failed) : ;;
+ *)
+ # This covers conditions like "activating", which still return 3 from
+ # systemctl is-active.
+ active=true
+ e "btrbk active on shell:$shell, status:$status, sleeping 8 seconds"
+ sleep 8
+ break
+ ;;
+ esac
+ done
+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 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 -xs $new_host <<'EOFOUTER'
-new_host=$1
-cedit mail_host /etc/hosts <<EOF || /etc/init.d/dnsmasq restart
-$(grep "\b$new_hostname\b" /etc/hosts | awk '{print $1}') mail.iankelling.org
-EOF
-EOFOUTER
+# 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.
+
+
+e Running initial btrbk
+if ! m btrbk-run -v $bbk_args $mp_args; then
+ ret=$?
+ err "failed initial btrbk"
+ mexit $ret
fi
-$old_shell primary-setup $new_hostname
+m $old_shell /a/exe/primary-setup $new_hostname
-/a/bin/distro-setup/install-my-scripts
-
-if $localhost_new; then
- btrbk-run -s $old_host -m /o
-else
- btrbk-run -t $new_host -m /o
+e Running main btrbk
+m btrbk-run -v $bbk_args -m /o || ret=$?
+if (( ret )); then
+ bang="$(printf "$(tput setaf 5)█$(tput sgr0)%.0s" 1 2 3 4 5 6 7)"
+ e $bang failed btrbk of /o. restoring old host as primary
+ m $old_shell /a/exe/primary-setup localhost
+ mexit $ret
fi
-$new_shell primary-setup $new_hostname
+m $new_shell /a/exe/primary-setup localhost
-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
+mexit 0