#!/bin/bash
+# I, Ian Kelling, follow the GNU license recommendations at
+# https://www.gnu.org/licenses/license-recommendations.en.html. They
+# recommend that small programs, < 300 lines, be licensed under the
+# Apache License 2.0. This file contains or is part of one or more small
+# programs. If a small program grows beyond 300 lines, I plan to switch
+# its license to GPL.
-source /usr/local/lib/err
+# Copyright 2024 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 -e; . /usr/local/lib/bash-bear; set +e
usage() {
cat <<EOF
-Usage: ${0##*/} [OPTIONS] push|pull HOST
+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
Note: Uses GNU getopt options parsing style
EOF
- exit $1
+ exit 0
}
+script_name="${BASH_SOURCE[0]}"
+script_name="${script_name##*/}"
restore_new_btrbk=false
restore_old_btrbk=false
fi
}
-pre="${0##*/}:"
+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 [[ $EUID != 0 ]]; then
err "requires running as root"
##### begin command line parsing ########
+mail_only=false
+host2_only=false
force=false
-mp_args="-m /o,/q,/a"
-temp=$(getopt -l force,help ioh "$@") || usage 1
+force_arg=
+pull_reexec=false
+mp_args="-m /o,/a,/q,/qd,/qr"
+check_installed=false
+orig_args=("$@")
+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
- --force) force=true ;;
+ -a) snapshot_arg=resume ;;
+ --force|-f)
+ force=true
+ force_arg=-f
+ ;;
+ --check-installed)
+ check_installed=true
+ ;;
-i) incremental_arg="-i" ;;
- -o) mp_args="-m /o" ;;
+ # 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 ;;
done
-(( $# == 2 )) || usage 1
+if (( $# != 2 )) && ! $check_installed; then
+ err expected 2 args, got $#
+fi
if [[ ! $HOSTNAME ]]; then
err "\$HOSTNAME is unset"
exit 1
fi
-case $1 in
+uninstalled-file-die() {
+ die "on host=$HOSTNAME, uninstalled file $1. run install-my-scripts or rerun with -f"
+}
+
+
+source /a/bin/bash_unpublished/source-state
+
+direction=$1
+host=$2
+
+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,/q,/qd,/qr"
+fi
+
+
+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/bash-bear-trap/bash-bear /usr/local/lib/bash-bear; 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=$2
+ new_host=$host
bbk_args="-t $new_host"
new_shell="ssh -F $HOME/.ssh/confighome root@$new_host"
- $new_shell -v hostname
- new_hostname=$($new_shell hostname)
+ if ! new_hostname=$($new_shell hostname); then
+ echo "$pre: error: failed ssh. retrying failed $new_shell with -v for more info:"
+ $new_shell -v hostname
+ fi
;;
pull)
- old_host=$2
+ old_host=$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
- if ! old_hostname=$($old_shell hostname); then
- echo "retrying failed $old_shell with -v"
+ # 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: $old_shell switch-mail-host --check-installed"
+ fi
+ fi
+ tmpd=$(mktemp -d)
+ files=(
+ /usr/local/{bin/{unsaved-buffers{,.el},switch-mail-host},lib/bash-bear}
+ )
+ m scp -F $HOME/.ssh/confighome \
+ ${files[@]/#/root@$old_host:} $tmpd
+ diff=false
+ for f in ${files[@]}; do
+ if ! diff -q $tmpd/${f##*/} $f; then
+ m install -T $tmpd/${f##*/} $f
+ diff=true
+ fi
+ done
+ if $diff; then
+ e "found different version on old_host=$old_host, reexecing"
+ m /usr/local/bin/switch-mail-host --pull-reexec "${orig_args[@]}"
+ exit 0
+ fi
+ rm -r -- $tmpd
+ fi
+
+ f=/a/bin/bash_unpublished/source-state
+ if ! old_info=$($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
;;
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."
- exit 1
+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
done
done
-# ensure these are unused before doing anything
-
-e "On $new_host: umounting /m and /o, checking emacs"
-$new_shell bash -s <<'EOF'
-set -eE
-if pgrep -f 'emacs --daemon' &>/dev/null; then
- bufs="$(emacsclient --eval "$(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
+if ! $host2_only; then
+ # ensure these are unused before doing anything
+ e "On $new_host: umounting /m and /o, checking emacs"
+ {
+ cat /usr/local/bin/unsaved-buffers
+ 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
+ if mountpoint -q /\$dir; then
+ echo On $new_host: umount /\$dir
+ umount /\$dir
fi
done
EOF
+ fi
+ } | $new_shell bash -s
+fi
-$old_shell bash -s <<'EOF'
-if pgrep -f 'emacs --daemon' &>/dev/null; then
- bufs="$(emacsclient --eval "$(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
+if ! $mail_only; then
+ cat /usr/local/bin/unsaved-buffers - <<'EOF' | $old_shell bash -s
+
+# 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.
+pkill -xf 'emacs( --daemon| -f znc-all)' ||:
+
+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
e Running initial btrbk
-if ! m btrbk-run -v $bbk_args $incremental_arg $mp_args; then
- ret=$?
+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 ! m $old_shell /a/exe/primary-setup $new_hostname; then
- ret=$?
- err "failed \$old_shell primary-setup \$new_hostname. fix and rerun switch-mail-host"
+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
-# 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.
-m $new_shell killall -q emacs ||:
e Running main btrbk
-m btrbk-run -v $bbk_args $incremental_arg -m /o || ret=$?
+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)"
+ bang="███████"
e $bang failed btrbk of /o. restoring old host as primary
- m $old_shell /a/exe/primary-setup localhost
+ if ! m $old_shell /a/exe/primary-setup localhost; then
+ die "due to failed btrbk of /o, we tried to restore old host as primary, but then we failed at that too. To resolve: Fix & rerun switch-mail-host, or fix and rerun primary-setup localhost on old shell so you have a working mail server and then rerun switch-mail-host."
+ fi
+ e finished restoring old host as primary, now exiting $ret due to earlier failed btrbk of /o.
exit $ret
fi
+# new system is usable at this point
+blocks=██████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████
+printf "%s\n" "${blocks:0:${COLUMNS:-100}}"
+
# 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
#
# 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
-if ! m $new_shell /a/exe/primary-setup localhost; then
- ret=$?
+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
iankelling.org / git / distro-setup / blobdiff