Add a setup mod to move postfix queue to /home/user-data

setup/mods.available/move-postfix-queue-to-user-data.sh

@@ -0,0 +1,71 @@
+#!/bin/bash
+
+#####
+##### This file is part of Mail-in-a-Box-LDAP which is released under the
+##### terms of the GNU Affero General Public License as published by the
+##### Free Software Foundation, either version 3 of the License, or (at
+##### your option) any later version. See file LICENSE or go to
+##### https://github.com/downtownallday/mailinabox-ldap for full license
+##### details.
+#####
+
+#
+# This setup mod script configures postfix to queue incoming messages
+# into /home/user-data/mail/spool/postfix instead of the default
+# /var/spool/postfix. The benefits of doing this are:
+#
+#   1. It will ensure nightly backups include queued, but undelivered, mail
+#   2. If you maintain a separate filesystem for /home/user-data, this
+#      will get the queue off the root filesystem
+#
+# created: 2023-10-06 author: downtownallday
+#
+# Install instructions
+# ====================
+# From the mailinabox directory, run the following commands as root:
+#
+#   1. setup/enmod.sh move-postfix-queue-to-user-data
+#   2. run either `setup/start.sh` or `ehdd/start-encrypted.sh` (if using
+#      encryption-at-rest)
+#
+# Removal
+# =======
+# From the mailinabox directory, run the following commands as root:
+#
+#   1. local/move-postfix-queue-to-user-data.sh remove
+#   2. rm local/move-postfix-queue-to-user-data.sh`)
+#
+
+[ -e /etc/mailinabox.conf ] && source /etc/mailinabox.conf
+[ -e /etc/cloudinabox.conf ] && source /etc/cloudinabox.conf
+. setup/functions.sh
+
+
+change_queue_directory() {
+    local where="$1"
+    local cur
+    cur=$(/usr/sbin/postconf -p queue_directory | awk -F= '{gsub(/^ +/, "", $2); print $2}')
+    if [ "$cur" = "$where" ]; then
+        echo "Postfix queue directory: $cur (no change)"
+        return 0
+    fi
+    echo "Moving postfix queue directory to $where"
+    systemctl stop postfix
+    rm -rf "$where"
+    mkdir -p "$(dirname "$where")"
+    mv "$cur" "$where"
+    /usr/sbin/postconf -e "queue_directory=$where"
+    systemctl start postfix
+    echo "New postfix queue directory: $where (was: $cur)"
+}
+
+
+if [ "${1:-}" = "remove" ]; then
+    change_queue_directory /var/spool/postfix
+else
+    if [ ! -d "$STORAGE_ROOT/mail" ]; then
+        echo "Error! $STORAGE_ROOT/mail does not exist!"
+        exit 1
+    fi
+    change_queue_directory $STORAGE_ROOT/mail/spool/postfix
+fi