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-rw-r--r--guix/scripts/discover.scm22
1 files changed, 14 insertions, 8 deletions
diff --git a/guix/scripts/discover.scm b/guix/scripts/discover.scm
index b17dbdcb3c..007db0d49d 100644
--- a/guix/scripts/discover.scm
+++ b/guix/scripts/discover.scm
@@ -110,14 +110,16 @@ lock on FILE to synchronize with any potential readers."
(define* (read-substitute-urls #:key (file (%publish-file)))
"Read substitute urls list from FILE and return it. Use a read lock on FILE
to synchronize with the writer."
- (with-read-file-lock file
- (call-with-input-file file
- (lambda (port)
- (let loop ((url (read-line port))
- (urls '()))
- (if (eof-object? url)
- urls
- (loop (read-line port) (cons url urls))))))))
+ (if (file-exists? file)
+ (with-read-file-lock file
+ (call-with-input-file file
+ (lambda (port)
+ (let loop ((url (read-line port))
+ (urls '()))
+ (if (eof-object? url)
+ urls
+ (loop (read-line port) (cons url urls)))))))
+ '()))
;;;
@@ -156,3 +158,7 @@ to synchronize with the writer."
(mkdir-p (dirname publish-file))
(avahi-browse-service-thread service-proc
#:types %services)))))
+
+;;; Local Variables:
+;;; eval: (put 'with-read-file-lock 'scheme-indent-function 1)
+;;; End: