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-rw-r--r--guix/progress.scm16
1 files changed, 13 insertions, 3 deletions
diff --git a/guix/progress.scm b/guix/progress.scm
index 334bd40547..0cbc804ec1 100644
--- a/guix/progress.scm
+++ b/guix/progress.scm
@@ -347,15 +347,25 @@ should be a <progress-reporter> object."
(report total)
(loop total (get-bytevector-n! in buffer 0 buffer-size))))))))
-(define* (progress-report-port reporter port #:key (close? #t))
+(define* (progress-report-port reporter port
+ #:key
+ (close? #t)
+ download-size)
"Return a port that continuously reports the bytes read from PORT using
REPORTER, which should be a <progress-reporter> object. When CLOSE? is true,
-PORT is closed when the returned port is closed."
+PORT is closed when the returned port is closed.
+
+When DOWNLOAD-SIZE is passed, do not read more than DOWNLOAD-SIZE bytes from
+PORT. This is important to avoid blocking when the remote side won't close
+the underlying connection."
(match reporter
(($ <progress-reporter> start report stop)
(let* ((total 0)
(read! (lambda (bv start count)
- (let ((n (match (get-bytevector-n! port bv start count)
+ (let* ((count (if download-size
+ (min count (- download-size total))
+ count))
+ (n (match (get-bytevector-n! port bv start count)
((? eof-object?) 0)
(x x))))
(set! total (+ total n))