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utils: Add #:sync? parameter to ‘with-atomic-file-output’.

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* guix/utils.scm (with-atomic-file-output): Add #:sync? and honor it.
Add ‘force-output’ call.

Change-Id: I2479778ae55360c0fab3389ac9249045a27b3568
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Ludovic Courtès 2025-04-08 18:49:25 +02:00
parent c44495bb10
commit 5525315092
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GPG key ID: 090B11993D9AEBB5
1 changed files with 10 additions and 4 deletions
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14
guix/utils.scm
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@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012-2022, 2024 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2012-2022, 2024-2025 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013, 2014, 2015 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2014 Eric Bavier <bavier@member.fsf.org>
;;; Copyright © 2014 Ian Denhardt <ian@zenhack.net>
@ -1057,16 +1057,22 @@ delete it when leaving the dynamic extent of this call."
(lambda ()
(false-if-exception (delete-file-recursively tmp-dir))))))
(define (with-atomic-file-output file proc)
(define* (with-atomic-file-output file proc #:key (sync? #t))
"Call PROC with an output port for the file that is going to replace FILE.
Upon success, FILE is atomically replaced by what has been written to the
output port, and PROC's result is returned."
output port, and PROC's result is returned.
When SYNC? is true, call 'fdatasync' on the temporary file before renaming it
to FILE; set it to #false for caches and temporary files to improve
performance."
(let* ((template (string-append file ".XXXXXX"))
(out (mkstemp! template)))
(with-throw-handler #t
(lambda ()
(let ((result (proc out)))
(fdatasync out)
(when sync?
(force-output out)
(fdatasync out))
(close-port out)
(rename-file template file)
result))