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utils: Add 'false-if-file-not-found'. 

* guix/build/utils.scm (false-if-file-not-found): New macro.
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Ludovic Courtès 2018-03-11 22:04:12 +01:00
parent 5e268faf85
commit 5c6391b33a
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1 changed files with 11 additions and 1 deletions
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12
guix/build/utils.scm
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@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013 Andreas Enge <andreas@enge.fr>
;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org>
;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
@ -61,6 +61,7 @@
delete-file-recursively
file-name-predicate
find-files
false-if-file-not-found
search-path-as-list
set-path-environment-variable
@ -396,6 +397,15 @@ also be included. If FAIL-ON-ERROR? is true, raise an exception upon error."
stat)
string<?)))
(define-syntax-rule (false-if-file-not-found exp)
"Evaluate EXP but return #f if it raises to 'system-error with ENOENT."
(catch 'system-error
(lambda () exp)
(lambda args
(if (= ENOENT (system-error-errno args))
#f
(apply throw args)))))
;;;
;;; Search paths.