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build: Accept dates with space-padded hour field. 

* guix/build/download.scm: Replace "parse-rfc-822-date" from the (web
  http) module.
This commit is contained in:
Ricardo Wurmus 2016-04-29 22:12:24 +02:00
parent d3699b311b
commit 8bfd602bb0
1 changed files with 79 additions and 0 deletions
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79
guix/build/download.scm
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@ -426,6 +426,85 @@ port if PORT is a TLS session record port."
(module-define! (resolve-module '(web client))
'shutdown (const #f))
;; XXX: Work around <http://bugs.gnu.org/23421>, fixed in Guile commit
;; 16050431f29d56f80c4a8253506fc851b8441840. Guile's date validation
;; procedure rejects dates in which the hour is not padded with a zero but
;; with whitespace.
(begin
(define-syntax string-match?
(lambda (x)
(syntax-case x ()
((_ str pat) (string? (syntax->datum #'pat))
(let ((p (syntax->datum #'pat)))
#`(let ((s str))
(and
(= (string-length s) #,(string-length p))
#,@(let lp ((i 0) (tests '()))
(if (< i (string-length p))
(let ((c (string-ref p i)))
(lp (1+ i)
(case c
((#\.) ; Whatever.
tests)
((#\d) ; Digit.
(cons #`(char-numeric? (string-ref s #,i))
tests))
((#\a) ; Alphabetic.
(cons #`(char-alphabetic? (string-ref s #,i))
tests))
(else ; Literal.
(cons #`(eqv? (string-ref s #,i) #,c)
tests)))))
tests)))))))))
(define (parse-rfc-822-date str space zone-offset)
(let ((parse-non-negative-integer (@@ (web http) parse-non-negative-integer))
(parse-month (@@ (web http) parse-month))
(bad-header (@@ (web http) bad-header)))
;; We could verify the day of the week but we don't.
(cond ((string-match? (substring str 0 space) "aaa, dd aaa dddd dd:dd:dd")
(let ((date (parse-non-negative-integer str 5 7))
(month (parse-month str 8 11))
(year (parse-non-negative-integer str 12 16))
(hour (parse-non-negative-integer str 17 19))
(minute (parse-non-negative-integer str 20 22))
(second (parse-non-negative-integer str 23 25)))
(make-date 0 second minute hour date month year zone-offset)))
((string-match? (substring str 0 space) "aaa, d aaa dddd dd:dd:dd")
(let ((date (parse-non-negative-integer str 5 6))
(month (parse-month str 7 10))
(year (parse-non-negative-integer str 11 15))
(hour (parse-non-negative-integer str 16 18))
(minute (parse-non-negative-integer str 19 21))
(second (parse-non-negative-integer str 22 24)))
(make-date 0 second minute hour date month year zone-offset)))
;; The next two clauses match dates that have a space instead of
;; a leading zero for hours, like " 8:49:37".
((string-match? (substring str 0 space) "aaa, dd aaa dddd d:dd:dd")
(let ((date (parse-non-negative-integer str 5 7))
(month (parse-month str 8 11))
(year (parse-non-negative-integer str 12 16))
(hour (parse-non-negative-integer str 18 19))
(minute (parse-non-negative-integer str 20 22))
(second (parse-non-negative-integer str 23 25)))
(make-date 0 second minute hour date month year zone-offset)))
((string-match? (substring str 0 space) "aaa, d aaa dddd d:dd:dd")
(let ((date (parse-non-negative-integer str 5 6))
(month (parse-month str 7 10))
(year (parse-non-negative-integer str 11 15))
(hour (parse-non-negative-integer str 17 18))
(minute (parse-non-negative-integer str 19 21))
(second (parse-non-negative-integer str 22 24)))
(make-date 0 second minute hour date month year zone-offset)))
(else
(bad-header 'date str) ; prevent tail call
#f))))
(module-set! (resolve-module '(web http))
'parse-rfc-822-date parse-rfc-822-date))
;; XXX: Work around <http://bugs.gnu.org/19840>, present in Guile
;; up to 2.0.11.
(unless (or (> (string->number (major-version)) 2)