From a7c1ae052cb441d7445610b2ac5a7caf8e66d9d1 Mon Sep 17 00:00:00 2001
From: Jon Lockwood <jonathon.lockwood@networkedweb.com>
Date: Mon, 14 Feb 2022 09:51:20 +0930
Subject: [PATCH] feat(backup): Added backup cron and helper script.

Backs up all of the data to the /backup dir.

MR !1
---
 dockerfile                          |  9 ++++-
 include/bin/backup.sh               | 53 +++++++++++++++++++++++++++++
 include/etc/cron.d/container_backup |  6 ++++
 3 files changed, 67 insertions(+), 1 deletion(-)
 create mode 100644 include/bin/backup.sh
 create mode 100644 include/etc/cron.d/container_backup

diff --git a/dockerfile b/dockerfile
index a81ccdc..fe8bb1f 100644
--- a/dockerfile
+++ b/dockerfile
@@ -55,8 +55,14 @@ RUN chmod +x /docker-entrypoint.sh \
       # Create vmail user for system
     && groupadd -g 5000 vmail \
     && useradd -g vmail -u 5000 vmail -d /var/vmail \
+      # Ensure Backup directory is created
+    && mkdir /backup \
+    && chown root:root /backup \
+    && chmod 700 /backup \
       # create SSL directory for ssl certificates
     && mkdir -p /ssl \
+      # Ensure scripts are executable
+    && chmod +x /bin/backup.sh \
       # Dovecot related commands
     && mkdir -p /srv/mail \ 
     && chown vmail:vmail /srv/mail \
@@ -82,9 +88,10 @@ RUN chmod +x /docker-entrypoint.sh \
       # Spammassassin related Commands
     && mkdir -p /var/spool/spamassassin \
     && chmod 777 /var/spool/spamassassin \
+        
 
 # Setup data volumes
-VOLUME /srv/mail /ssl /var/spool/spamassassin /var/log
+VOLUME /srv/mail /ssl /var/spool/spamassassin /backup /var/log
 
 # Configure postfix
 RUN postconf -e "maillog_file=/var/log/postfix.log" \
diff --git a/include/bin/backup.sh b/include/bin/backup.sh
new file mode 100644
index 0000000..fecd9db
--- /dev/null
+++ b/include/bin/backup.sh
@@ -0,0 +1,53 @@
+#!/bin/bash
+
+set -e
+
+backup_version=1.0
+back_file_name="mail_server-$backup_version-$(date +%Y-%m-%d-%H%M-%Z).tar.gz"
+
+start=$(date '+%s')
+
+includes=(/srv/mail)
+includes+=(/ssl)
+includes+=(/var/spool/spamassassin)
+includes+=(/var/log)
+includes+=(/var/lib/amavis)
+
+
+backup_command="tar -czpvf $back_file_name ${includes[@]}"
+
+cd /tmp
+
+echo "$backup_command"
+
+if ! $backup_command; then
+  status="tar failed"
+elif ! mv "/tmp/$back_file_name" /backup/ ; then
+  status="mv failed"
+else
+  status="success: version=$backup_version size=$(stat -c%s /backup/$back_file_name) duration=$((`date '+%s'` - $start)) command='$backup_command'"
+fi
+
+
+logger -t backup "$status"
+
+
+if [ "0$POST_MASTER_EMAIL" != "0" ]; then
+
+cat << EOF | /usr/lib/dovecot/dovecot-lda -d "${POST_MASTER_EMAIL}" -o "plugin/quota=maildir:User quota:noenforcing"
+Auto-Submitted: auto-generated
+Date: $(date +'%a, %-d %b %Y %H:%M:%S %z')
+To: ${POST_MASTER_EMAIL}
+From: Mail Server <NO-REPLY@$(hostname -f)>
+Subject: Backup $(date +%Y-%m-%d-%H:%M-%Z)
+
+Server backups have occured on $(hostname -f)
+
+Summary:
+
+    $status
+
+EOF
+
+fi
+
diff --git a/include/etc/cron.d/container_backup b/include/etc/cron.d/container_backup
new file mode 100644
index 0000000..fbd572f
--- /dev/null
+++ b/include/etc/cron.d/container_backup
@@ -0,0 +1,6 @@
+#
+#  Backup the docker container 
+#
+# m h dom mon dow user  command
+01 0,3,6,9,12,15,18,21	* * *	root	/bin/backup.sh 2>&1
+