X-Git-Url: https://iankelling.org/git/?a=blobdiff_plain;f=switch-mail-host;h=df0b83605ee25fc8c7743504d18a5698278a2916;hb=77917a8fbf2032a8b2634a1b3de0879ec45cf213;hp=5d7a6793388dd76b181b5b893eae590c4f1b1fdb;hpb=fbb0315374736f92d950545796beaa79cbdc1f49;p=distro-setup

diff --git a/switch-mail-host b/switch-mail-host
old mode 100755
new mode 100644
index 5d7a679..df0b836
--- a/switch-mail-host
+++ b/switch-mail-host
@@ -1,166 +1,181 @@
 #!/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
-fi
-
-if [[ $new_host == "$HOSTNAME" ]]; then
-  localhost_new=true
-  new_shell=
-else
-  localhost_new=false
-  new_shell="ssh $new_host"
+if [[ ! $HOSTNAME ]]; then
+  err '$HOSTNAME is unset'
+  mexit 1
 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
-fi
-
-# TODO: turn this home dns update into a separate script that also runs
-# as a cronjob for the MAIL_HOST, so it can update dns for a laptop that
-# moves to a different network.
-#
-# This exists because if mail_host is on the home network with a vpn
-# tunnel, and another host on the home network tries to connect to the
-# public tunnel ip, it won't work because from the public machine's
-# perspective, due to nat, both home network machines have the same
-# ip. We could solve this by using ipv6 addresses, but not all networks
-# i'm on with more than one machine are ipv6 enabled.
-at_home=false
-if timeout -s 9 5 ssh-keyscan -p 2220 -t rsa 10.0.0.1 2>/dev/null | grep -qFx '[10.0.0.1]:2220 ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCH+/h1dGEfKEusBblndU2e6QT4wLCm5+yqr/sqh/0X9YfjR7BfWWm8nNmuP55cYc+Wuf5ljB1H1acXEcsl1y8e0j3agHfF0V74FE1N1zz5nn2Ep8NHnmqgEhza38ZxMPh+4p3X7zklEKU7+3SzybKBi8sg0wLzlS2LM0JaUN80zR2sK11Kye3dURUXPk78u5wodOkgcEYRwSYaDMJlUzWP+poRXIDJwFaMQnwmxbl/c84yOyaU0x/d6hFwoRscWecihX+vvBNeSyxR4xr2HDOyUWwJkctyAgt2p7w3tfkXOKcCRzTAjGVIMQLTvo0sG/yJbcyHoEFdFybCsgDvfyYn'; then
-  at_home=true
+  mexit 1
 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=:
-else
-  wrt_shell="ssh wrt.b8.nz"
-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 $1}') mail.iankelling.org
-EOF
-EOFOUTER
-fi
-
-$old_shell primary-setup $new_hostname
+# 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.
 
-/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 initial btrbk
+if ! m btrbk-run -v $bbk_args $mp_args; then
+  ret=$?
+  err "failed initial btrbk"
+  mexit $ret
 fi
 
-$new_shell primary-setup $new_hostname
+m $old_shell /a/exe/primary-setup $new_hostname
 
-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
+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
+
+m $new_shell /a/exe/primary-setup localhost
+
+mexit 0