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substitute-binary: Gracefully exit upon networking errors.

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Suggested by Andreas Enge <andreas@enge.fr>.

* guix/scripts/substitute-binary.scm (with-networking): New macro.
  (guix-substitute-binary): Wrap the body in `with-networking'.
This commit is contained in:
Ludovic Courtès 2013-05-29 23:21:54 +02:00
parent 56b1f4b780
commit cf5d2ca329
1 changed files with 84 additions and 70 deletions
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154
guix/scripts/substitute-binary.scm
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@ -361,6 +361,19 @@ (define %cache-url
(or (getenv "GUIX_BINARY_SUBSTITUTE_URL")
"http://hydra.gnu.org"))
(define-syntax with-networking
(syntax-rules ()
"Catch DNS lookup errors and gracefully exit."
;; Note: no attempt is made to catch other networking errors, because DNS
;; lookup errors are typically the first one, and because other errors are
;; a subset of `system-error', which is harder to filter.
((_ exp ...)
(catch 'getaddrinfo-error
(lambda () exp ...)
(lambda (key error)
(leave (_ "host name lookup error: ~a~%")
(gai-strerror error)))))))
;;;
;;; Entry point.
@ -370,77 +383,78 @@ (define (guix-substitute-binary . args)
"Implement the build daemon's substituter protocol."
(mkdir-p %narinfo-cache-directory)
(maybe-remove-expired-cached-narinfo)
(match args
(("--query")
(let ((cache (delay (open-cache %cache-url))))
(let loop ((command (read-line)))
(or (eof-object? command)
(begin
(match (string-tokenize command)
(("have" paths ..1)
;; Return the subset of PATHS available in CACHE.
(let ((substitutable
(if cache
(par-map (cut lookup-narinfo cache <>)
paths)
'())))
(for-each (lambda (narinfo)
(when narinfo
(format #t "~a~%" (narinfo-path narinfo))))
(filter narinfo? substitutable))
(newline)))
(("info" paths ..1)
;; Reply info about PATHS if it's in CACHE.
(let ((substitutable
(if cache
(par-map (cut lookup-narinfo cache <>)
paths)
'())))
(for-each (lambda (narinfo)
(format #t "~a\n~a\n~a\n"
(narinfo-path narinfo)
(or (and=> (narinfo-deriver narinfo)
(cute string-append
(%store-prefix) "/"
<>))
"")
(length (narinfo-references narinfo)))
(for-each (cute format #t "~a/~a~%"
(%store-prefix) <>)
(narinfo-references narinfo))
(format #t "~a\n~a\n"
(or (narinfo-file-size narinfo) 0)
(or (narinfo-size narinfo) 0)))
(filter narinfo? substitutable))
(newline)))
(wtf
(error "unknown `--query' command" wtf)))
(loop (read-line)))))))
(("--substitute" store-path destination)
;; Download STORE-PATH and add store it as a Nar in file DESTINATION.
(let* ((cache (delay (open-cache %cache-url)))
(narinfo (lookup-narinfo cache store-path))
(uri (narinfo-uri narinfo)))
;; Tell the daemon what the expected hash of the Nar itself is.
(format #t "~a~%" (narinfo-hash narinfo))
(with-networking
(match args
(("--query")
(let ((cache (delay (open-cache %cache-url))))
(let loop ((command (read-line)))
(or (eof-object? command)
(begin
(match (string-tokenize command)
(("have" paths ..1)
;; Return the subset of PATHS available in CACHE.
(let ((substitutable
(if cache
(par-map (cut lookup-narinfo cache <>)
paths)
'())))
(for-each (lambda (narinfo)
(when narinfo
(format #t "~a~%" (narinfo-path narinfo))))
(filter narinfo? substitutable))
(newline)))
(("info" paths ..1)
;; Reply info about PATHS if it's in CACHE.
(let ((substitutable
(if cache
(par-map (cut lookup-narinfo cache <>)
paths)
'())))
(for-each (lambda (narinfo)
(format #t "~a\n~a\n~a\n"
(narinfo-path narinfo)
(or (and=> (narinfo-deriver narinfo)
(cute string-append
(%store-prefix) "/"
<>))
"")
(length (narinfo-references narinfo)))
(for-each (cute format #t "~a/~a~%"
(%store-prefix) <>)
(narinfo-references narinfo))
(format #t "~a\n~a\n"
(or (narinfo-file-size narinfo) 0)
(or (narinfo-size narinfo) 0)))
(filter narinfo? substitutable))
(newline)))
(wtf
(error "unknown `--query' command" wtf)))
(loop (read-line)))))))
(("--substitute" store-path destination)
;; Download STORE-PATH and add store it as a Nar in file DESTINATION.
(let* ((cache (delay (open-cache %cache-url)))
(narinfo (lookup-narinfo cache store-path))
(uri (narinfo-uri narinfo)))
;; Tell the daemon what the expected hash of the Nar itself is.
(format #t "~a~%" (narinfo-hash narinfo))
(let*-values (((raw download-size)
(fetch uri #:buffered? #f))
((input pids)
(decompressed-port (narinfo-compression narinfo)
raw)))
;; Note that Hydra currently generates Nars on the fly and doesn't
;; specify a Content-Length, so DOWNLOAD-SIZE is #f in practice.
(format (current-error-port)
(_ "downloading `~a' from `~a'~:[~*~; (~,1f KiB)~]...~%")
store-path (uri->string uri)
download-size
(and=> download-size (cut / <> 1024.0)))
(let*-values (((raw download-size)
(fetch uri #:buffered? #f))
((input pids)
(decompressed-port (narinfo-compression narinfo)
raw)))
;; Note that Hydra currently generates Nars on the fly and doesn't
;; specify a Content-Length, so DOWNLOAD-SIZE is #f in practice.
(format (current-error-port)
(_ "downloading `~a' from `~a'~:[~*~; (~,1f KiB)~]...~%")
store-path (uri->string uri)
download-size
(and=> download-size (cut / <> 1024.0)))
;; Unpack the Nar at INPUT into DESTINATION.
(restore-file input destination)
(every (compose zero? cdr waitpid) pids))))
(("--version")
(show-version-and-exit "guix substitute-binary"))))
;; Unpack the Nar at INPUT into DESTINATION.
(restore-file input destination)
(every (compose zero? cdr waitpid) pids))))
(("--version")
(show-version-and-exit "guix substitute-binary")))))
;;; substitute-binary.scm ends here