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services: shepherd: Remove ‘dynamic-wind’ in ‘call-with-*-file’.

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Fixes <https://issues.guix.gnu.org/64653>.

The ‘dynamic-wind’ was causing files to be closed prematurely when
leaving the dynamic extent of PROC for instance via a delimited
continuation, using Fibers (that ‘dynamic-wind’ call was also
semantically incorrect in the first place).

* gnu/services/shepherd.scm (shepherd-configuration-file)
[config](call-with-file): Remove.
(call-with-input-file, call-with-output-file): Rewrite in terms of
‘call-with-port’.

Change-Id: Ica8af71a04f525a15be99985552063cb98cd6ee8
This commit is contained in:
Ludovic Courtès 2024-01-05 00:20:50 +01:00
parent 5cec983e04
commit 4e431fda5f
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1 changed files with 5 additions and 16 deletions
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17
gnu/services/shepherd.scm
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@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013-2016, 2018-2023 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013-2016, 2018-2024 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2017 Clément Lassieur <clement@lassieur.org>
;;; Copyright © 2018 Carlo Zancanaro <carlo@zancanaro.id.au>
;;; Copyright © 2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
@ -371,17 +371,6 @@ (define config
(use-modules (srfi srfi-34)
(system repl error-handling))
(define (call-with-file file flags proc)
(let ((port #f))
(dynamic-wind
(lambda ()
(set! port (open file flags)))
(lambda ()
(proc port))
(lambda ()
(close-port port)
(set! port #f)))))
;; There's code run from shepherd that uses 'call-with-input-file' &
;; co.--e.g., the 'urandom-seed' service. Starting from Shepherd
;; 0.9.2, users need to make sure not to leak non-close-on-exec file
@ -389,11 +378,11 @@ (define (call-with-file file flags proc)
;; standard bindings with O_CLOEXEC variants.
(set! call-with-input-file
(lambda (file proc)
(call-with-file file (logior O_RDONLY O_CLOEXEC)
(call-with-port (open file (logior O_RDONLY O_CLOEXEC))
proc)))
(set! call-with-output-file
(lambda (file proc)
(call-with-file file (logior O_WRONLY O_CREAT O_CLOEXEC)
(call-with-port (open file (logior O_WRONLY O_CREAT O_CLOEXEC))
proc)))
;; Specify the default environment visible to all the services.