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substitute: Improve readability of download progress report.

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* guix/build/download.scm
  (string-pad-middle, store-url-abbreviation, store-path-abbreviation):
  New procedures.
  (progress-proc): Add #:abbreviation parameter and use it.  Generate a
  better indeterminate progress string.
* guix/scripts/substitute.scm (assert-valid-narinfo): Add newlines to output.
  (process-substitution): Use byte-count->string and store-path-abbreviation.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>
This commit is contained in:
Steve Sprang 2015-09-14 22:31:11 -07:00 committed by Ludovic Courtès
parent 41ddebdd2a
commit a8be7b9a7a
2 changed files with 53 additions and 25 deletions
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61
guix/build/download.scm
View file

@ -36,8 +36,10 @@ (define-module (guix build download)
resolve-uri-reference
maybe-expand-mirrors
url-fetch
byte-count->string
progress-proc
uri-abbreviation))
uri-abbreviation
store-path-abbreviation))
;;; Commentary:
;;;
@ -96,10 +98,33 @@ (define* (progress-bar % #:optional (bar-width 20))
(make-string filled #\#)
(make-string empty #\space))))
(define* (progress-proc file size #:optional (log-port (current-output-port)))
(define (string-pad-middle left right len)
"Combine LEFT and RIGHT with enough padding in the middle so that the
resulting string has length at least LEN. This right justifies RIGHT."
(string-append left
(string-pad right (max 0 (- len (string-length left))))))
(define (store-url-abbreviation url)
"Return a friendlier version of URL for display."
(let ((store-path (string-append (%store-directory) "/" (basename url))))
;; Take advantage of the implementation for store paths.
(store-path-abbreviation store-path)))
(define* (store-path-abbreviation store-path #:optional (prefix-length 6))
"Return an abbreviation of STORE-PATH for display, showing PREFIX-LENGTH
characters of the hash."
(let ((base (basename store-path)))
(string-append (string-take base prefix-length)
"…"
(string-drop base 32))))
(define* (progress-proc file size
#:optional (log-port (current-output-port))
#:key (abbreviation identity))
"Return a procedure to show the progress of FILE's download, which is SIZE
bytes long. The returned procedure is suitable for use as an argument to
`dump-port'. The progress report is written to LOG-PORT."
`dump-port'. The progress report is written to LOG-PORT, with ABBREVIATION
used to shorten FILE for display."
;; 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.
@ -123,31 +148,31 @@ (define* (progress-proc file size #:optional (log-port (current-output-port)))
(/ transferred elapsed)
0))
(left (format #f " ~a ~a"
(basename file)
(abbreviation file)
(byte-count->string size)))
(right (format #f "~a/s ~a ~a~6,1f%"
(byte-count->string throughput)
(seconds->string elapsed)
(progress-bar %) %))
;; TODO: Make this adapt to the actual terminal width.
(cols 80)
(num-spaces (max 1 (- cols (+ (string-length left)
(string-length right)))))
(gap (make-string num-spaces #\space)))
(format log-port "~a~a~a" left gap right)
(progress-bar %) %)))
;; TODO: Make this adapt to the actual terminal width.
(display (string-pad-middle left right 80) log-port)
(display #\cr log-port)
(flush-output-port log-port)
(cont))))
(lambda (transferred cont)
(with-elapsed-time elapsed
(let ((throughput (if elapsed
(/ transferred elapsed)
0)))
(let* ((throughput (if elapsed
(/ transferred elapsed)
0))
(left (format #f " ~a"
(abbreviation file)))
(right (format #f "~a/s ~a | ~a transferred"
(byte-count->string throughput)
(seconds->string elapsed)
(byte-count->string transferred))))
;; TODO: Make this adapt to the actual terminal width.
(display (string-pad-middle left right 80) log-port)
(display #\cr log-port)
(format log-port "~a\t~a transferred (~a/s)"
file
(byte-count->string transferred)
(byte-count->string throughput))
(flush-output-port log-port)
(cont))))))))

17
guix/scripts/substitute.scm
View file

@ -31,7 +31,8 @@ (define-module (guix scripts substitute)
#:use-module (guix pki)
#:use-module ((guix build utils) #:select (mkdir-p dump-port))
#:use-module ((guix build download)
#:select (progress-proc uri-abbreviation))
#:select (progress-proc uri-abbreviation
store-path-abbreviation byte-count->string))
#:use-module (ice-9 rdelim)
#:use-module (ice-9 regex)
#:use-module (ice-9 match)
@ -337,8 +338,9 @@ (define* (assert-valid-narinfo narinfo
(unless %allow-unauthenticated-substitutes?
(assert-valid-signature narinfo signature hash acl)
(when verbose?
;; Visually separate substitutions with a newline.
(format (current-error-port)
"found valid signature for '~a', from '~a'~%"
"~%Found valid signature for ~a~%From ~a~%"
(narinfo-path narinfo)
(uri->string (narinfo-uri narinfo)))))
narinfo))))
@ -753,13 +755,12 @@ (define* (process-substitution store-item destination
;; Tell the daemon what the expected hash of the Nar itself is.
(format #t "~a~%" (narinfo-hash narinfo))
(format (current-error-port) "downloading `~a'~:[~*~; (~,1f MiB installed)~]...~%"
store-item
(format (current-error-port) "Downloading ~a~:[~*~; (~a installed)~]...~%"
(store-path-abbreviation store-item)
;; Use the Nar size as an estimate of the installed size.
(narinfo-size narinfo)
(and=> (narinfo-size narinfo)
(cute / <> (expt 2. 20))))
(cute byte-count->string <>)))
(let*-values (((raw download-size)
;; Note that Hydra currently generates Nars on the fly
;; and doesn't specify a Content-Length, so
@ -772,7 +773,9 @@ (define* (process-substitution store-item destination
(narinfo-size narinfo))))
(progress (progress-proc (uri-abbreviation uri)
dl-size
(current-error-port))))
(current-error-port)
#:abbreviation
store-path-abbreviation)))
(progress-report-port progress raw)))
((input pids)
(decompressed-port (and=> (narinfo-compression narinfo)