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authorMaxim Cournoyer <maxim.cournoyer@gmail.com>2022-09-19 22:06:54 -0400
committerMaxim Cournoyer <maxim.cournoyer@gmail.com>2022-10-07 10:11:12 -0400
commit4cce84b247b3a7fa2bfd52e49d4ff8e73b78481f (patch)
tree10a3781b6ad9a08afe21228075f4e167fe6cb9fe /gnu/build
parent21f641e9faf55b13263d5f0b3314860af5d697a5 (diff)
marionette: Preserve screen dumps on failures.
This is to make it easier to debug test failures involving 'wait-for-screen-text': the screendump image used for the OCR is now preserved for inspection when 'wait-for-screen-text' fails. * gnu/build/marionette.scm (marionette-screen-text): Return the screendump image file as the second value. Adjust doc. (wait-for-screen-text): Add the preserved screendump image file name to the error message. Adjust doc.
Diffstat (limited to 'gnu/build')
-rw-r--r--gnu/build/marionette.scm42
1 files changed, 29 insertions, 13 deletions
diff --git a/gnu/build/marionette.scm b/gnu/build/marionette.scm
index aba6fb8146..5f8a74717a 100644
--- a/gnu/build/marionette.scm
+++ b/gnu/build/marionette.scm
@@ -22,6 +22,7 @@
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-64)
+ #:use-module (srfi srfi-71)
#:use-module (rnrs io ports)
#:use-module (ice-9 match)
#:use-module (ice-9 popen)
@@ -311,18 +312,20 @@ Monitor\")."
(define* (marionette-screen-text marionette #:key (ocr "ocrad"))
"Take a screenshot of MARIONETTE, perform optical character
-recognition (OCR), and return the text read from the screen as a string. Do
-this by invoking OCR, which should be the file name of GNU Ocrad's
-@command{ocrad} or Tesseract OCR's @command{tesseract} command."
+recognition (OCR), and return the text read from the screen as a string, along
+the screen dump image used. Do this by invoking OCR, which should be the file
+name of GNU Ocrad's@command{ocrad} or Tesseract OCR's @command{tesseract}
+command. The screen dump image returned as the second value should be deleted
+if it is not needed."
(define image (string-append (tmpnam) ".ppm"))
;; Use the QEMU Monitor to save an image of the screen to the host.
(marionette-control (string-append "screendump " image) marionette)
;; Process it via the OCR.
(cond
((string-contains ocr "ocrad")
- (invoke-ocrad-ocr image #:ocrad ocr))
+ (values (invoke-ocrad-ocr image #:ocrad ocr) image))
((string-contains ocr "tesseract")
- (invoke-tesseract-ocr image #:tesseract ocr))
+ (values (invoke-tesseract-ocr image #:tesseract ocr) image))
(else (error "unsupported ocr command"))))
(define* (wait-for-screen-text marionette predicate
@@ -330,21 +333,34 @@ this by invoking OCR, which should be the file name of GNU Ocrad's
(ocr "ocrad")
(timeout 30))
"Wait for TIMEOUT seconds or until the screen text on MARIONETTE matches
-PREDICATE, whichever comes first. Raise an error when TIMEOUT is exceeded."
+PREDICATE, whichever comes first. Raise an error when TIMEOUT is exceeded.
+The error contains the recognized text along the preserved file name of the
+screen dump, which is relative to the current working directory."
(define start
(car (gettimeofday)))
(define end
(+ start timeout))
- (let loop ((last-text #f))
+ (let loop ((last-text #f)
+ (last-screendump #f))
(if (> (car (gettimeofday)) end)
- (error "'wait-for-screen-text' timeout" 'ocr-text: last-text)
- (let ((text (marionette-screen-text marionette #:ocr ocr)))
- (or (predicate text)
- (begin
- (sleep 1)
- (loop text)))))))
+ (let ((screendump-backup (string-drop last-screendump 5)))
+ ;; Move the file from /tmp/fileXXXXXX.pmm to the current working
+ ;; directory, so that it is preserved in the test derivation output.
+ (copy-file last-screendump screendump-backup)
+ (delete-file last-screendump)
+ (error "'wait-for-screen-text' timeout"
+ 'ocr-text: last-text
+ 'screendump: screendump-backup))
+ (let* ((text screendump (marionette-screen-text marionette #:ocr ocr))
+ (result (predicate text)))
+ (cond (result
+ (delete-file screendump)
+ result)
+ (else
+ (sleep 1)
+ (loop text screendump)))))))
(define %qwerty-us-keystrokes
;; Maps "special" characters to their keystrokes.