substitute: Improve functional decomposition.
* guix/scripts/substitute.scm (display-narinfo-data, process-query, process-substitution): New procedures. Code moved from... (guix-substitute): ... here. Use them.
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Ludovic Courtès
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f8a8e0fe16
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ef8f910fce
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@ -697,6 +697,95 @@ Internal tool to substitute a pre-built binary to a local build.\n"))
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(show-bug-report-information))
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;;;
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;;; Daemon/substituter protocol.
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;;;
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(define (display-narinfo-data narinfo)
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"Write to the current output port the contents of NARINFO is the format
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expected by the daemon."
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(format #t "~a\n~a\n~a\n"
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(narinfo-path narinfo)
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(or (and=> (narinfo-deriver narinfo)
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(cute string-append (%store-prefix) "/" <>))
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"")
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(length (narinfo-references narinfo)))
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(for-each (cute format #t "~a/~a~%" (%store-prefix) <>)
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(narinfo-references narinfo))
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(format #t "~a\n~a\n"
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(or (narinfo-file-size narinfo) 0)
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(or (narinfo-size narinfo) 0)))
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(define* (process-query command
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#:key cache-url acl)
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"Reply to COMMAND, a query as written by the daemon to this process's
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standard input. Use ACL as the access-control list against which to check
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authorized substitutes."
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(define (valid? obj)
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(and (narinfo? obj) (valid-narinfo? obj acl)))
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(match (string-tokenize command)
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(("have" paths ..1)
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;; Return the subset of PATHS available in CACHE-URL.
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(let ((substitutable (lookup-narinfos cache-url paths)))
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(for-each (lambda (narinfo)
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(format #t "~a~%" (narinfo-path narinfo)))
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(filter valid? substitutable))
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(newline)))
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(("info" paths ..1)
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;; Reply info about PATHS if it's in CACHE-URL.
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(let ((substitutable (lookup-narinfos cache-url paths)))
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(for-each display-narinfo-data (filter valid? substitutable))
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(newline)))
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(wtf
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(error "unknown `--query' command" wtf))))
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(define* (process-substitution store-item destination
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#:key cache-url acl)
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"Substitute STORE-ITEM (a store file name) from CACHE-URL, and write it to
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DESTINATION as a nar file. Verify the substitute against ACL."
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(let* ((narinfo (lookup-narinfo cache-url store-item))
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(uri (narinfo-uri narinfo)))
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;; Make sure it is signed and everything.
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(assert-valid-narinfo narinfo acl)
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;; Tell the daemon what the expected hash of the Nar itself is.
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(format #t "~a~%" (narinfo-hash narinfo))
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(format (current-error-port) "downloading `~a'~:[~*~; (~,1f MiB installed)~]...~%"
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store-item
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;; Use the Nar size as an estimate of the installed size.
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(narinfo-size narinfo)
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(and=> (narinfo-size narinfo)
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(cute / <> (expt 2. 20))))
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(let*-values (((raw download-size)
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;; Note that Hydra currently generates Nars on the fly
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;; and doesn't specify a Content-Length, so
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;; DOWNLOAD-SIZE is #f in practice.
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(fetch uri #:buffered? #f #:timeout? #f))
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((progress)
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(let* ((comp (narinfo-compression narinfo))
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(dl-size (or download-size
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(and (equal? comp "none")
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(narinfo-size narinfo))))
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(progress (progress-proc (uri-abbreviation uri)
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dl-size
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(current-error-port))))
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(progress-report-port progress raw)))
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((input pids)
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(decompressed-port (and=> (narinfo-compression narinfo)
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string->symbol)
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progress)))
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;; Unpack the Nar at INPUT into DESTINATION.
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(restore-file input destination)
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;; Skip a line after what 'progress-proc' printed.
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(newline (current-error-port))
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(every (compose zero? cdr waitpid) pids))))
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;;;
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;;; Entry point.
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@ -800,90 +889,19 @@ substituter disabled~%")
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(with-error-handling ; for signature errors
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(match args
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(("--query")
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(let ((cache %cache-url)
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(acl (current-acl)))
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(define (valid? obj)
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(and (narinfo? obj) (valid-narinfo? obj acl)))
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(let ((acl (current-acl)))
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(let loop ((command (read-line)))
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(or (eof-object? command)
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(begin
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(match (string-tokenize command)
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(("have" paths ..1)
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;; Return the subset of PATHS available in CACHE.
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(let ((substitutable
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(lookup-narinfos cache paths)))
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(for-each (lambda (narinfo)
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(format #t "~a~%" (narinfo-path narinfo)))
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(filter valid? substitutable))
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(newline)))
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(("info" paths ..1)
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;; Reply info about PATHS if it's in CACHE.
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(let ((substitutable
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(lookup-narinfos cache paths)))
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(for-each (lambda (narinfo)
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(format #t "~a\n~a\n~a\n"
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(narinfo-path narinfo)
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(or (and=> (narinfo-deriver narinfo)
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(cute string-append
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(%store-prefix) "/"
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<>))
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"")
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(length (narinfo-references narinfo)))
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(for-each (cute format #t "~a/~a~%"
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(%store-prefix) <>)
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(narinfo-references narinfo))
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(format #t "~a\n~a\n"
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(or (narinfo-file-size narinfo) 0)
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(or (narinfo-size narinfo) 0)))
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(filter valid? substitutable))
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(newline)))
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(wtf
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(error "unknown `--query' command" wtf)))
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(process-query command
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#:cache-url %cache-url
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#:acl acl)
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(loop (read-line)))))))
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(("--substitute" store-path destination)
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;; Download STORE-PATH and add store it as a Nar in file DESTINATION.
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(let* ((cache %cache-url)
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(narinfo (lookup-narinfo cache store-path))
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(uri (narinfo-uri narinfo)))
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;; Make sure it is signed and everything.
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(assert-valid-narinfo narinfo)
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;; Tell the daemon what the expected hash of the Nar itself is.
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(format #t "~a~%" (narinfo-hash narinfo))
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(format (current-error-port) "downloading `~a'~:[~*~; (~,1f MiB installed)~]...~%"
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store-path
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;; Use the Nar size as an estimate of the installed size.
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(narinfo-size narinfo)
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(and=> (narinfo-size narinfo)
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(cute / <> (expt 2. 20))))
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(let*-values (((raw download-size)
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;; Note that Hydra currently generates Nars on the fly
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;; and doesn't specify a Content-Length, so
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;; DOWNLOAD-SIZE is #f in practice.
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(fetch uri #:buffered? #f #:timeout? #f))
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((progress)
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(let* ((comp (narinfo-compression narinfo))
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(dl-size (or download-size
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(and (equal? comp "none")
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(narinfo-size narinfo))))
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(progress (progress-proc (uri-abbreviation uri)
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dl-size
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(current-error-port))))
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(progress-report-port progress raw)))
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((input pids)
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(decompressed-port (and=> (narinfo-compression narinfo)
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string->symbol)
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progress)))
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;; Unpack the Nar at INPUT into DESTINATION.
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(restore-file input destination)
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;; Skip a line after what 'progress-proc' printed.
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(newline (current-error-port))
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(every (compose zero? cdr waitpid) pids))))
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(process-substitution store-path destination
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#:cache-url %cache-url
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#:acl (current-acl)))
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(("--version")
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(show-version-and-exit "guix substitute"))
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(("--help")
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@ -891,7 +909,6 @@ substituter disabled~%")
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(opts
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(leave (_ "~a: unrecognized options~%") opts))))))
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;;; Local Variables:
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;;; eval: (put 'with-timeout 'scheme-indent-function 1)
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;;; End:
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