+++ /dev/null
-#!/bin/bash
-
-source /usr/local/lib/err
-
-usage() {
- cat <<EOF
-Usage: switch-mail-host|switch-host2 [OPTIONS] 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.
-
--a Avoid snapshot /a, /q, and similar. If we haven't
- made any changes in the last hour, there is no
- need to snapshot anything but /o, and we will
- just do that once.
--i Disallow incremental backup.
--o Only btrbk /o, instead of all filesystems.
---force Run even though our local state does not say that MAIL_HOST is
- us when pushing or HOST when pulling.
--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 0
-}
-
-script_name="${BASH_SOURCE[0]}"
-script_name="${script_name##*/}"
-
-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 systemctl start btrbk.timer
- fi
- if $restore_old_btrbk; then
- e WARNING: due to failure, btrbk.timer may need manual restoration:
- e $old_shell systemctl start btrbk.timer
- fi
-}
-
-pre="$script_name:"
-m() { printf "$pre %s\n" "$*"; "$@"; }
-e() { printf "$pre %s\n" "$*"; }
-err() { echo "$pre ERROR: $*" >&2; }
-die() { printf "%s\n" "$*" >&2; echo "exiting with status 1" >&2; exit 1; }
-
-if [[ $EUID != 0 ]]; then
- err "requires running as root"
- exit 1
-fi
-
-
-##### begin command line parsing ########
-
-mail_only=false
-host2_only=false
-force=false
-force_arg=
-pull_reexec=false
-mp_args="-m /o,/a,/ar,/q,/qd,/qr"
-check_installed=false
-orig_args=("$@")
-if ! temp=$(getopt -l check-installed,force,pull-reexec,help afioh "$@"); then
- err "args invalid. args=$*"
-fi
-eval set -- "$temp"
-while true; do
- case $1 in
- -a) snapshot_arg=resume ;;
- --force|-f)
- force=true
- force_arg=-f
- ;;
- --check-installed)
- check_installed=true
- ;;
- -i) incremental_arg="-i" ;;
- # internal option for rerunning under newer old_host when doing pull
- --pull-reexec) pull_reexec=true;;
- -o)
- mail_only=true ;;
- -h|--help) usage ;;
- --) shift; break ;;
- *) echo "$0: Internal error! unexpected args: $*" ; exit 1 ;;
- esac
- shift
-done
-
-
-if (( $# != 2 )) && ! $check_installed; then
- err expected 2 args, got $#
-fi
-
-if [[ ! $HOSTNAME ]]; then
- err "\$HOSTNAME is unset"
- exit 1
-fi
-
-uninstalled-file-die() {
- die "on host=$HOSTNAME, uninstalled file $1. run install-my-scripts or rerun with -f"
-}
-
-
-source /a/bin/bash_unpublished/source-state
-
-direction=$1
-host=$2
-
-
-if ! $force && { $check_installed || [[ $direction == push ]]; } ; then
- install_bin_files=(
- mount-latest-subvol
- check-subvol-stale
- btrbk-run
- switch-mail-host
- )
- for f in ${install_bin_files[@]}; do
- if ! diff -q /a/bin/ds/$f /usr/local/bin/$f; then
- uninstalled-file-die $f
- fi
- done
- if ! diff -q /a/bin/errhandle/err /usr/local/lib/err; then
- uninstalled-file-die err
- fi
- if $check_installed; then
- exit 0
- fi
-fi
-
-
-case $direction in
- push)
- old_host=$HOSTNAME
- old_hostname=$HOSTNAME
- new_host=$host
- bbk_args="-t $new_host"
- new_shell="ssh -F $HOME/.ssh/confighome root@$new_host"
- if ! new_hostname=$($new_shell hostname); then
- echo "$pre: error: failed ssh. retrying failed $new_shell with -v for more info:"
- $new_shell -v hostname
- fi
- ;;
- pull)
- old_host=$host
- new_host=$HOSTNAME
- new_hostname=$HOSTNAME
- bbk_args="-s $old_host"
- old_shell="ssh -F $HOME/.ssh/confighome root@$old_host"
- # tests ssh connection. crafted this to not need to do escape chars
-
- if ! $mail_only && ! $pull_reexec ; then
- if ! $force; then
- if ! $old_shell switch-mail-host --check-installed; then
- die "failed: $old_shell switch-mail-host --check-installed"
- fi
- fi
- tmpf=$(mktemp)
- m scp -F $HOME/.ssh/confighome root@$old_host:/usr/local/bin/switch-mail-host $tmpf
- if ! diff -q $tmpf ${BASH_SOURCE[0]}; then
- e "found different version on old_host=$old_hostname, reexecing"
- m install -T $tmpf /usr/local/bin/switch-mail-host
- m /usr/local/bin/switch-mail-host --pull-reexec "${orig_args[@]}"
- exit 0
- fi
- fi
-
- f=/a/bin/bash_unpublished/source-state
- if ! old_info=$($old_shell "hostname; sed -n s,.*MAIL_HOST=,,p $f; sed -n s,.*HOST2=,,p $f"); then
- echo "$pre: error: failed ssh. retrying failed $old_shell with -v for more info:"
- $old_shell -v hostname
- exit 1
- fi
- read -d '' -r old_hostname MAIL_HOST HOST2 <<<"$old_info" || (( $? == 1 ))
-
- ;;
- *)
- err invalid first argument
- exit 1
- ;;
-esac
-
-case $script_name in
- switch-mail-host)
- if [[ $MAIL_HOST != "$HOST2" ]]; then
- mail_only=true
- fi
- ;;
- switch-host2)
- host2_only=true
- ;;
- *)
- err unexpected script name
- ;;
-esac
-
-if $mail_only; then
- mp_args="-m /o"
-elif $host2_only; then
- mp_args="-m /a,/ar,/q,/qd,/qr"
-fi
-
-if ! $force; then
- if $host2_only; then
- if [[ $old_hostname != "$HOST2" ]]; then
- err "\$old_hostname($old_hostname) != \$HOST2($HOST2). Rerun with --force if you really want this."
- exit 1
- fi
- elif [[ $old_hostname != "$MAIL_HOST" ]]; then
- err "\$old_hostname($old_hostname) != \$MAIL_HOST($MAIL_HOST). Rerun with --force if you really want this."
- exit 1
- fi
-fi
-
-if [[ ! $new_host || ! $old_host ]]; then
- echo "$0: bad args. see script"
- exit 1
-fi
-
-
-########### end initial processing, begin actually modifying things ##########
-
-if $new_shell systemctl is-active btrbk.timer; then
- m $new_shell systemctl stop btrbk.timer
- restore_new_btrbk=true
-fi
-if $old_shell systemctl is-active btrbk.timer; then
- m $old_shell 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 "On $new_host: umounting /m and /o, checking emacs"
-{
- cat <<'EOF'
-set -eE
-if pgrep -G iank -u iank -f 'emacs --daemon' &>/dev/null; then
- bufs="$(sudo -u iank env XDG_RUNTIME_DIR=/run/user/1000 emacsclient --eval "$(cat /a/bin/ds/unsaved-buffers.el)"| sed '/^"nil"$/d;s/^"(/E: /;s/)"$//')"
- if [[ $bufs ]]; then
- echo "error: on $HOSTNAME, unsaved emacs files: $bufs" >&2
- exit 1
- fi
-fi
-EOF
- if ! $host2_only; then
- cat <<EOF
-for dir in m o; do
- if mountpoint -q /\$dir; then
- echo On $new_host: umount /\$dir
- umount /\$dir
- fi
-done
-EOF
- fi
-} | $new_shell bash -s
-
-if ! $mail_only; then
- $old_shell bash -s <<'EOF'
-set -e
-if pgrep -G iank -u iank -f 'emacs --daemon' &>/dev/null; then
- bufs="$(sudo -u iank env XDG_RUNTIME_DIR=/run/user/1000 emacsclient --eval "$(cat /a/bin/ds/unsaved-buffers.el)"| sed '/^"nil"$/d;s/^"(/E: /;s/)"$//')"
- if [[ $bufs ]]; then
- echo "error: on $HOSTNAME, unsaved emacs files: $bufs" >&2
- exit 1
- fi
-fi
-
-# Try to prevent emacs from saving stale data it has in memory to disk. eg: files, recentf list, etc.
-# But if emacs ignores the signal, let it live.
-killall -q emacs ||:
-
-if [[ -e /p/profanity-here ]]; then
- systemctl disable --now profanity
-fi
-EOF
-fi
-
-# 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
-m btrbk-run -v $bbk_args $force_arg $incremental_arg $mp_args $snapshot_arg || ret=$?
-if (( ret )); then
- err "failed initial btrbk"
- exit $ret
-fi
-
-if ! $mail_only; then
- m $old_shell sed -ri "s/HOST2=.*/HOST2=$new_hostname/" /a/bin/bash_unpublished/source-state
- m $new_shell sed -ri "s/HOST2=.*/HOST2=$new_hostname/" /a/bin/bash_unpublished/source-state
-fi
-
-if $host2_only; then
- if [[ $old_hostname != "$MAIL_HOST" && $old_hostname != kd ]]; then
- m $old_shell systemctl --now disable btrbk.timer
- fi
- m $new_shell systemctl --now enable btrbk.timer
- if [[ -e /p/profanity-here ]]; then
- m $new_shell systemctl --now enable profanity
- fi
- exit 0
-fi
-
-m $old_shell /a/exe/primary-setup $new_hostname || ret=$?
-if (( ret )); then
- err "failed \$old_shell primary-setup \$new_hostname. fix and rerun $script_name"
- exit $ret
-fi
-
-
-e Running main btrbk
-m btrbk-run -v --fast $bbk_args $force_arg $incremental_arg -m /o || ret=$?
-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
- exit $ret
-fi
-
-# new system is usable at this point
-blocks=██████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████
-printf "%s\n" "$(tput setaf 5 2>/dev/null ||:)${blocks:0:${COLUMNS:-180}}$(tput sgr0 2>/dev/null||:)"
-
-# once I accidentally accepted incoming mail on old host. I used this script to copy over that mail:
-#
-# die=false; for d in o.leaf.2021-05-29T10:02:08-0400/m/{4e,md,4e2}/{,l/}!(*myarchive)/new; do if $die; then break; fi; find $d -type f -mtime -5 | while read -r f; do dir="${f%new/*}"; dir="btrbk/o.20210530T000011-0400/${dir#*/}"; fname="${f##*/}"; [[ -e $dir/new/$fname || -e $dir/cur/$fname ]] && continue; if ! e cp -a $f /${dir#*/*/}new; then echo failed cp; die=true; break; fi ; done; done
-
-# once I accidentally sent mail from non-main mail host. to copy into the main mail host's sent dir, cd into dir of non-mail mail host Sent/cur, then
-#
-# shopt -s nullglob; find . -type f -mtime -2 | while read -r f; do a=( /m/4e/Sent/cur/${f%,*}* ); if (( ${#a[@]} )); then e exists $a; else m cp -a $f /m/4e/Sent/cur; fi; done
-
-m $new_shell /a/exe/primary-setup localhost || ret=$?
-if (( ret )); then
- err "failed final primary-setup, just fix and rerun: $new_shell /a/exe/primary-setup localhost"
- exit $ret
-fi
-
-if ! $mail_only && [[ -e /p/profanity-here ]]; then
- m $new_shell systemctl --now enable profanity || ret=$?
- if (( ret )); then
- err "failed final systemctl --now enable profanity, just fix and rerun"
- exit $ret
- fi
-fi
-
-m exit 0
iankelling.org / git / distro-setup / blobdiff