From f5287dc11ed091bf4b9d1d34d9f5404704aa3b2d Mon Sep 17 00:00:00 2001
From: Mathieu Othacehe <othacehe@gnu.org>
Date: Wed, 3 Mar 2021 08:39:02 +0100
Subject: [PATCH] Add with-transaction.

* src/cuirass/database.scm (with-transaction): New macro.
---
 .dir-locals.el           |  1 +
 src/cuirass/database.scm | 10 +++++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/.dir-locals.el b/.dir-locals.el
index b0223cc..45731c6 100644
--- a/.dir-locals.el
+++ b/.dir-locals.el
@@ -13,6 +13,7 @@
   (eval put 'test-error 'scheme-indent-function 1)
   (eval put 'make-parameter 'scheme-indent-function 1)
   (eval put 'with-database 'scheme-indent-function 0)
+  (eval put 'with-transaction 'scheme-indent-function 0)
  (texinfo-mode
   (indent-tabs-mode)
   (fill-column . 72)
diff --git a/src/cuirass/database.scm b/src/cuirass/database.scm
index 1d309ce..cc4ff5a 100644
--- a/src/cuirass/database.scm
+++ b/src/cuirass/database.scm
@@ -107,7 +107,8 @@
             ;; Macros.
             exec-query/bind
             with-database
-            with-db-worker-thread))
+            with-db-worker-thread
+            with-transaction))
 
 ;; Maximum priority for a Build or Specification.
 (define max-priority 9)
@@ -273,6 +274,13 @@ DB is bound to the argument of that critical section: the database connection."
                 (number->string receive-timeout)
                 caller-name))))))
 
+(define-syntax-rule (with-transaction exp ...)
+  "Evalute EXP within an SQL transaction."
+  (with-db-worker-thread db
+    (exec-query db "BEGIN TRANSACTION;")
+    exp ...
+    (exec-query db "COMMIT;")))
+
 (define (read-sql-file file-name)
   "Return a list of string containing SQL instructions from FILE-NAME."
   (call-with-input-file file-name