From f565fd63feabd72af06ffdd904dd3ce46ac0f531 Mon Sep 17 00:00:00 2001
From: Michael Vasseur <michael.vasseur@vu.nl>
Date: Sun, 10 Sep 2023 12:11:10 +0200
Subject: [PATCH] Ask for confirmation before overwriting existing DB dump

Closes: https://github.com/DOMjudge/domjudge-scripts/pull/79
---
 .../ansible/roles/mysql_server/files/dump-db  | 22 ++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/provision-contest/ansible/roles/mysql_server/files/dump-db b/provision-contest/ansible/roles/mysql_server/files/dump-db
index 0a8adee3..65c8e975 100644
--- a/provision-contest/ansible/roles/mysql_server/files/dump-db
+++ b/provision-contest/ansible/roles/mysql_server/files/dump-db
@@ -1,5 +1,9 @@
 #!/bin/sh
 
+create_database_dump () {
+	sudo mysqldump --opt --skip-lock-tables domjudge | pv | gzip > "/home/domjudge/db-dumps/${1}.sql.gz"
+}
+
 if [ -z "$1" ]
 then
 	echo "Usage dump-db [name]"
@@ -7,4 +11,20 @@ then
 	exit 1
 fi
 
-sudo mysqldump --opt --skip-lock-tables domjudge | pv | gzip > "/home/domjudge/db-dumps/${1}.sql.gz"
+if [ -f "/home/domjudge/db-dumps/${1}.sql.gz" ]; then
+	while true; do
+		read -p "Overwrite existing database dump (y/N)? " yn
+			case $yn in
+				[Yy]* ) create_database_dump $1; exit 0;
+				''|[Nn]* ) break;;
+			esac
+	done
+else
+	create_database_dump $1
+fi
+
+read -p "Provide prefix or say 'no' to abort. Format: [prefix]-$1 " prefix
+case $prefix in
+	''|[Nn]o|[Nn] ) exit 2; break;;
+	* ) create_database_dump ${prefix}-${1}; break;;
+esac