templates/docker-compose/borgmatic/backup.sh - refinements

Trap failures, ensure cleanup.

Send an email even if we fail.

Break borg locks in cleanup.

Implement testing smtp emails.

templates/docker-compose/borgmatic/backup.sh

@@ -1,20 +1,56 @@
 #!/bin/sh
 # Run the backup and mail the logs
-
-BACKUP_COMMAND="borgmatic --stats"
-LOGFILE="/tmp/backup_run_$(date +%s).log"
+# Set TEST_SMTP=1 to run in SMTP testing mode, which will just send an email
 
 set -o pipefail
-if $BACKUP_COMMAND 2>&1 | tee $LOGFILE; then
-    SUBJECT_PREFIX="=?utf-8?Q? =E2=9C=85 SUCCESS?="
+
+# Set up environment
+/bin/sh /scripts/msmtprc.sh
+/bin/sh /scripts/env.sh
+BACKUP_COMMAND="borgmatic --stats -v 2"
+LOGFILE="/tmp/backup_run_$(date +%s).log"
+SUCCESS_PREFIX="=?utf-8?Q? =E2=9C=85 SUCCESS?="
+FAILED_PREFIX="=?utf-8?Q? =E2=9D=8C FAILED?="
+
+report() {
+    if [ -n "$SUCCESS" ]; then
+        PREFIX="$SUCCESS_PREFIX"
+    else
+        PREFIX="$FAILED_PREFIX"
+    fi
+    echo -e "Subject: $PREFIX: $MAIL_SUBJECT\n\n$(cat $LOGFILE)\n" |
+        sendmail -t "$MAIL_TO"
+}
+
+testmail() {
+    echo -e "Subject: TESTING!\n\ntest mail, please ignore\n" |
+        sendmail -t "$MAIL_TO"
+}
+
+failed() {
+    echo "Exited abnormally!"
+    report
+    rm -f "$LOGFILE"
+}
+
+cleanup() {
+    borgmatic break-lock
+    echo "Done, removing $LOGFILE"
+    rm -f "$LOGFILE"
+}
+
+# Handle various kinds of exit
+trap failed INT QUIT KILL
+trap cleanup EXIT
+
+if [ -n "$TEST_SMTP" ]; then
+    echo "Testing mail to $MAIL_TO"
+    testmail
+    echo "Done."
+    exit
+fi
+
+if $BACKUP_COMMAND 2>&1 | tee "$LOGFILE"; then
     SUCCESS=1
-else
-    SUBJECT_PREFIX="=?utf-8?Q? =E2=9D=8C FAILED?="
+    report
 fi
-
-if [ -z "$SUCCESS" ]; then
-    echo -e "Subject: $SUBJECT_PREFIX: $MAIL_SUBJECT\n\n$(cat $LOGFILE)\n" |
-        sendmail -t $MAIL_TO
-fi
-
-rm $LOGFILE