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download: Comment on lack of progress report with chunked encoding.

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* guix/build/download.scm (progress-proc): Add comment.
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Ludovic Courtès 2015-02-27 15:04:05 +01:00
parent 9fbe6f1920
commit c9727aac40
1 changed files with 3 additions and 0 deletions
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guix/build/download.scm
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@ -64,6 +64,9 @@ (define* (progress-proc file size #:optional (log-port (current-output-port)))
"Return a procedure to show the progress of FILE's download, which is
SIZE byte long. The returned procedure is suitable for use as an
argument to `dump-port'. The progress report is written to LOG-PORT."
;; XXX: Because of <http://bugs.gnu.org/19939> this procedure is often not
;; called as frequently as we'd like too; this is especially bad with Nginx
;; on hydra.gnu.org, which returns whole nars as a single chunk.
(let ((start-time #f))
(let-syntax ((with-elapsed-time
(syntax-rules ()