From 6d6b37c0ad62d448503efadf613790d133a88465 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Wed, 28 Mar 2018 10:01:50 +0200
Subject: bin/bootstrap-mysql: "ON DELETE SET NULL" for "NULL" columns

---
 bin/bootstrap-mysql | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/bin/bootstrap-mysql b/bin/bootstrap-mysql
index 43a79af..5f51c07 100755
--- a/bin/bootstrap-mysql
+++ b/bin/bootstrap-mysql
@@ -234,10 +234,17 @@ if [ ! "$1" = 'slim' ]; then
                           tr ' ' '\n' | \
                           sed -n 's/^://;T;p' | \
                           while read -r link; do
-                            printf 'ALTER TABLE `%s` ADD FOREIGN KEY (`%s`) REFERENCES `%s` (`id`) ON UPDATE CASCADE ON DELETE CASCADE;\n' \
+                            printf 'ALTER TABLE `%s` ADD FOREIGN KEY (`%s`) REFERENCES `%s` (`id`) ON UPDATE CASCADE ON DELETE ' \
                               "${table}" \
                               "${column}" \
                               "${link}"
+                            if echo "${rest}" | \
+                              grep -qwF 'NULL'; then
+                              printf 'SET NULL'
+                            else
+                              printf 'CASCADE'
+                            fi
+                            printf ';\n'
                           done
                       fi
                     ;;
-- 
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