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download: 'tls-wrap' retries handshake upon non-fatal errors.

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Fixes <https://bugs.gnu.org/49223>.
Reported by Domagoj Stolfa <ds815@gmx.com>.

* guix/build/download.scm (tls-wrap): Retry up to 5 times when
'handshake' throws a non-fatal error.
This commit is contained in:
Ludovic Courtès 2021-06-25 16:11:55 +02:00
parent 7fe195f3b7
commit b36267b1d9
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GPG Key ID: 090B11993D9AEBB5
1 changed files with 21 additions and 15 deletions
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36
guix/build/download.scm
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@ -281,21 +281,27 @@ host name without trailing dot."
;;(set-log-level! 10)
;;(set-log-procedure! log)
(catch 'gnutls-error
(lambda ()
(handshake session))
(lambda (key err proc . rest)
(cond ((eq? err error/warning-alert-received)
;; Like Wget, do no stop upon non-fatal alerts such as
;; 'alert-description/unrecognized-name'.
(format (current-error-port)
"warning: TLS warning alert received: ~a~%"
(alert-description->string (alert-get session)))
(handshake session))
(else
;; XXX: We'd use 'gnutls_error_is_fatal' but (gnutls) doesn't
;; provide a binding for this.
(apply throw key err proc rest)))))
(let loop ((retries 5))
(catch 'gnutls-error
(lambda ()
(handshake session))
(lambda (key err proc . rest)
(cond ((eq? err error/warning-alert-received)
;; Like Wget, do no stop upon non-fatal alerts such as
;; 'alert-description/unrecognized-name'.
(format (current-error-port)
"warning: TLS warning alert received: ~a~%"
(alert-description->string (alert-get session)))
(handshake session))
(else
(if (or (fatal-error? err) (zero? retries))
(apply throw key err proc rest)
(begin
;; We got 'error/again' or similar; try again.
(format (current-error-port)
"warning: TLS non-fatal error: ~a~%"
(error->string err))
(loop (- retries 1)))))))))
;; Verify the server's certificate if needed.
(when verify-certificate?