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database: ensure update-or-insert is run within a transaction

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update-or-insert can break if an insert occurs between when it decides whether
to update or insert and when it actually performs that operation.  Putting the
check and the update/insert operation in the same transaction ensures that the
update/insert will only succeed if no other write has occurred in the middle.

* guix/store/database.scm (call-with-savepoint): new procedure.
  (update-or-insert): use call-with-savepoint to ensure the read and the
  insert/update occur within the same transaction.
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Caleb Ristvedt 2020-06-01 21:43:14 -05:00
parent 5d6e225528
commit 37545de4a3
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2 changed files with 56 additions and 13 deletions
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.dir-locals.el
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@ -90,6 +90,7 @@
(eval . (put 'with-database 'scheme-indent-function 2))
(eval . (put 'call-with-transaction 'scheme-indent-function 2))
(eval . (put 'with-statement 'scheme-indent-function 3))
(eval . (put 'call-with-savepoint 'scheme-indent-function 1))
(eval . (put 'call-with-container 'scheme-indent-function 1))
(eval . (put 'container-excursion 'scheme-indent-function 1))