X-Git-Url: https://iankelling.org/git/?a=blobdiff_plain;f=switch-mail-host;h=eafe1044c0816c19aa7522b94445d6a3de7cec78;hb=7f759d320592e791a62cd0a966350e8c53ee0976;hp=2d74ceb824d69ac62089b5491abdfad4db0424ba;hpb=0da09a2fa9c4ce921d5af5be8494c4a96cce43de;p=distro-setup

diff --git a/switch-mail-host b/switch-mail-host
index 2d74ceb..eafe104 100644
--- a/switch-mail-host
+++ b/switch-mail-host
@@ -1,127 +1,136 @@
 #!/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.
 
 -o         Only btrbk /o, instead of all filesystems.
--w         Don't try to ssh to wrt. Should only be used in unusual network situation.
 -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=$(getopt -l help owh "$@") || usage 1
 mp_args="-m /o,/q,/a"
 eval set -- "$temp"
 while true; do
   case $1 in
     -o) mp_args="-m /o"; shift ;;
-    -w) update_wrt=false; 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-state
-
-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
+case $1 in
+  push)
+    old_host=$HOSTNAME
+    new_host=$2
+    bbk_args="-s $old_host"
+    new_shell="ssh $new_host"
+    new_hostname=$($new_shell hostname)
+    ;;
+  pull)
+    old_host=$2
+    new_host=$HOSTNAME
+    new_hostname=$HOSTNAME
+    bbk_args="-t $new_host"
+    bbk_args="-s $old_host"
+    old_shell="ssh $old_host"
+    # test ssh connection
+    $old_shell :
+    ;;
+  *)
+    err invalid first argument
+    mexit 1
+    ;;
+esac
 
-old_shell="ssh $old_host"
-if [[ $old_host == "$HOSTNAME" ]]; then
-  old_shell=
+source /a/bin/bash_unpublished/source-state
+
+if [[ $old_host != "$MAIL_HOST" ]]; then
+  e "WARNING: \$old_host != \$MAIL_HOST. Sleeping for 5 seconds in case you want to reconsider"
+  sleep 5
 fi
 
 if [[ ! $new_host || ! $old_host ]]; then
   echo "$0: bad args. see script"
-  exit 1
-fi
-
-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
-fi
-echo "$0: at_home = $at_home"
-
-source /a/bin/bash_unpublished/source-state
-#### 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"
+  mexit 1
 fi
 
-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
-  echo "$0: note: stopped btrbk.timer on $new_host"
+  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
-  echo "$0: note: stopped btrbk.timer on $old_host"
+  m $old_shell sudo systemctl stop btrbk.timer
   restore_old_btrbk=true
 fi
 
 btrbk_test="systemctl is-active btrbk.service"
-while [[ $($new_shell $btrbk_test) != inactive ]] || [[ $($old_shell $btrbk_test) != inactive ]]; do
-  echo "$0: btrbk is running on new or old host. sleeping for 8 seconds"
-  sleep 6
-  echo "$0: testing for btrbk activity in 2 seconds"
-  sleep 2
+while true; do
+  for shell in "$new_shell" "$old_shell"; do
+    e $shell $btrbk_test
+    status=$($shell $btrbk_test) ||:
+    case $status in
+      inactive|failed) : ;;
+      *)
+        e "btrbk active on shell:$shell, status:$status, sleeping 8 seconds"
+        sleep 8
+        continue
+        ;;
+    esac
+  done
+  break
 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
@@ -142,19 +151,25 @@ EOF
 # I think exim will try ipv6 first, so no need to disable
 # ipv6 i think.
 
-$old_shell /a/exe/primary-setup $new_hostname
 
-if $localhost_new; then
-  btrbk-run -s $old_host $mp_args
-else
-  btrbk-run -t $new_host $mp_args
+e Running initial btrbk
+if ! m btrbk-run -v $bbk_args $mp_args; then
+  ret=$?
+  err "failed initial btrbk"
+  mexit $ret
 fi
 
-$new_shell /a/exe/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
+if ! m btrbk-run -v $bbk_args -m /o; then
+  ret=$?
+  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