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gnupdate: Use SSAX instead of SXML to reduce the memory & CPU overhead.
* maintainers/scripts/gnu/gnupdate.scm (xml-element->snix): New procedure. (xml->snix): Rewrite to use a parser generated by `ssax:make-parser'. (%options)[sxml]: Remove. (main): Update accordingly. svn path=/nixpkgs/trunk/; revision=21695
This commit is contained in:
Ludovic Courtès
parent
e583aae98c
commit
11d4a76c27
@ -17,13 +17,12 @@
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(cond-expand (guile-2 #t)
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(else (error "GNU Guile 2.0 is required")))
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(use-modules (sxml simple)
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(use-modules (sxml ssax)
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(ice-9 popen)
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(ice-9 match)
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(ice-9 rdelim)
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(ice-9 regex)
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(ice-9 vlist)
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(sxml-match)
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(srfi srfi-1)
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(srfi srfi-9)
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(srfi srfi-11)
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@ -47,6 +46,13 @@
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(and line column path
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(make-location path (string->number line) (string->number column))))
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;; XXX: Hack to add missing exports from `(sxml ssax)' as of 1.9.10.
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(let ((ssax (resolve-module '(sxml ssax))))
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(for-each (lambda (sym)
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(module-add! (current-module) sym
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(module-variable ssax sym)))
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'(ssax:warn ssax:skip-pi nl)))
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;; Nix object types visible in the XML output of `nix-instantiate' and
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;; mapping to S-expressions (we map to sexps, not records, so that we
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;; can do pattern matching):
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@ -58,7 +64,7 @@
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;; bool #f|#t
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;; derivation (derivation drv-path out-path attributes)
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;; ellipsis '...
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;; expr (expr loc body ...)
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;; expr (snix loc body ...)
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;; function (function loc at|attrspat|varpat)
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;; int int
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;; list list
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@ -73,118 +79,100 @@
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;; lazily because the whole SXML tree has to be traversed to maintain the
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;; list of known derivations.
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(define (sxml->snix tree)
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;; Return the SNix represention of TREE, an SXML tree as returned by
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;; parsing the XML output of `nix-instantiate' on Nixpkgs.
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(define (xml-element->snix elem attributes body derivations)
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;; Return an SNix element corresponding to XML element ELEM.
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;; FIXME: We should use SSAX to avoid the SXML step otherwise we end up
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;; eating memory up to the point where fork(2) returns ENOMEM!
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(define (loc)
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(->loc (assq-ref attributes 'line)
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(assq-ref attributes 'column)
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(assq-ref attributes 'path)))
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(define whitespace
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;; The whitespace marker.
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(cons 'white 'space))
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(let loop ((node tree)
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(derivations vlist-null))
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(define (process-body body)
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(let ((result+derivations
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(fold (lambda (node result)
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(let-values (((out derivations)
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(loop node (cdr result))))
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(if (eq? out whitespace)
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result
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(cons (cons out (car result))
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derivations))))
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(cons '() derivations)
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body)))
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(values (reverse (car result+derivations))
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(cdr result+derivations))))
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(sxml-match node
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(,x
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(guard (and (string? x) (string=? (string-trim-both x) "")))
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(values whitespace derivations))
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((*TOP* (*PI* ,_ ...) (expr ,body ...))
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;; The entry/exit point. Of the two values returned, the second one
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;; is likely to be discarded by the caller (thanks to multiple-value
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;; truncation).
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(let-values (((body derivations) (process-body body)))
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(values (cons* 'snix #f body)
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derivations)))
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((at ,body ...)
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(let-values (((body derivations) (process-body body)))
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(values (list 'at body) derivations)))
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((attr (@ (name ,name)
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(line (,line #f)) (column (,column #f)) (path (,path #f)))
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,body ...)
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(let-values (((body derivations) (process-body body)))
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(values (cons* 'attribute
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(->loc line column path)
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name
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(if (or (null? body)
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(and (pair? body) (null? (cdr body))))
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body
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(error 'sxml->snix "invalid attribute body"
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body)))
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derivations)))
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((attrs ,body ...)
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(let-values (((body derivations) (process-body body)))
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(values (list 'attribute-set body)
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derivations)))
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((attrspat ,body ...)
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(let-values (((body derivations) (process-body body)))
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(values (cons 'attribute-set-pattern body)
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derivations)))
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((bool (@ (value ,value)))
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(values (string-ci=? value "true") derivations))
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((derivation (@ (drvPath ,drv-path) (outPath ,out-path)) ,body ...)
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(let-values (((body derivations) (process-body body)))
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(let ((repeated? (equal? body '(repeated))))
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(values (list 'derivation drv-path out-path
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(if repeated?
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(case elem
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((at)
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(values `(at ,(car body) ,(cadr body)) derivations))
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((attr)
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(let ((name (assq-ref attributes 'name)))
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(cond ((null? body)
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(values `(attribute-pattern ,name) derivations))
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((and (pair? body) (null? (cdr body)))
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(values `(attribute ,(loc) ,name ,(car body))
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derivations))
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(else
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(error "invalid attribute body" name (loc) body)))))
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((attrs)
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(values `(attribute-set ,(reverse body)) derivations))
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((attrspat)
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(values `(attribute-set-pattern ,body) derivations))
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((bool)
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(values (string-ci=? "true" (assq-ref attributes 'value))
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derivations))
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((derivation)
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(let ((drv-path (assq-ref attributes 'drvPath))
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(out-path (assq-ref attributes 'outPath)))
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(if (equal? body '(repeated))
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(let ((body (vhash-assoc drv-path derivations)))
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(if (pair? body)
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(cdr body)
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(values `(derivation ,drv-path ,out-path ,(cdr body))
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derivations)
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(error "no previous occurrence of derivation"
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drv-path)))
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body))
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(if repeated?
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derivations
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(vhash-cons drv-path body derivations))))))
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(values `(derivation ,drv-path ,out-path ,body)
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(vhash-cons drv-path body derivations)))))
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((ellipsis)
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(values '... derivations))
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((function (@ (line (,line #f)) (column (,column #f)) (path (,path #f)))
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,body ...)
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(let-values (((body derivations) (process-body body)))
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(values (cons* 'function
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(->loc line column path)
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(if (and (pair? body) (null? (cdr body)))
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body
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(error 'sxml->snix "invalid function body"
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body)))
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derivations)))
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((int (@ (value ,value)))
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(values (string->number value) derivations))
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(,x
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;; We can't use `(list ,body ...)', which has a different meaning,
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;; hence the guard hack.
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(guard (and (pair? x) (eq? (car x) 'list)))
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(process-body (cdr x)))
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((expr)
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(values `(snix ,(loc) ,@body) derivations))
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((function)
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(values `(function ,(loc) ,body) derivations))
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((int)
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(values (string->number (assq-ref attributes 'value))
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derivations))
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((list)
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(values body derivations))
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((null)
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(values 'null derivations))
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((path (@ (value ,value)))
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(values value derivations))
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((path)
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(values (assq-ref attributes 'value) derivations))
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((repeated)
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;; This is then handled in `derivation' above.
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(values 'repeated derivations))
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((string (@ (value ,value)))
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(values value derivations))
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((string)
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(values (assq-ref attributes 'value) derivations))
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((unevaluated)
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(values 'unevaluated derivations))
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((varpat (@ (name ,name)))
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(values (list 'varpat name) derivations))
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(,x
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(error 'sxml->snix "unmatched sxml form" x)))))
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((varpat)
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(values `(varpat ,(assq-ref attributes 'name)) derivations))
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(else (error "unhandled Nix XML element" elem))))
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(define xml->snix
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;; Return the SNix represention of TREE, an SXML tree as returned by
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;; parsing the XML output of `nix-instantiate' on Nixpkgs.
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(let ((parse
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(ssax:make-parser NEW-LEVEL-SEED
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(lambda (elem-gi attributes namespaces expected-content
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seed)
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(cons '() (cdr seed)))
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FINISH-ELEMENT
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(lambda (elem-gi attributes namespaces parent-seed
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seed)
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(let ((snix (car seed))
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(derivations (cdr seed)))
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(let-values (((snix derivations)
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(xml-element->snix elem-gi
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attributes
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snix
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derivations)))
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(cons (cons snix (car parent-seed))
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derivations))))
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CHAR-DATA-HANDLER
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(lambda (string1 string2 seed)
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;; Discard inter-node strings, which are blanks.
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seed))))
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(lambda (port)
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;; Discard the second value returned by the parser (the derivation
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;; vhash).
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(caar (parse port (cons '() vlist-null))))))
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(define (call-with-package snix proc)
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(match snix
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@ -658,20 +646,15 @@
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(format #t "~%")
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(format #t " -x, --xml=FILE Read XML output of `nix-instantiate'~%")
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(format #t " from FILE.~%")
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(format #t " -s, --sxml=FILE Read SXML output of `nix-instantiate'~%")
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(format #t " from FILE.~%")
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(format #t " -h, --help Give this help list.~%~%")
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(format #t "Report bugs to <ludo@gnu.org>~%")
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(exit 0)))
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(option '(#\x "xml") #t #f
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(lambda (opt name arg result)
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(alist-cons 'xml-file arg result)))
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(option '(#\s "sxml") #t #f
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(lambda (opt name arg result)
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(alist-cons 'sxml-file arg result)))))
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(alist-cons 'xml-file arg result)))))
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(define (main . args)
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(define-public (main . args)
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;; Assume Nixpkgs is under $NIXPKGS or ~/src/nixpkgs.
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(let* ((opts (args-fold args %options
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(lambda (opt name arg result)
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@ -682,24 +665,11 @@
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(home (getenv "HOME"))
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(path (or (getenv "NIXPKGS")
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(string-append home "/src/nixpkgs")))
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(sxml (or (and=> (assoc-ref opts 'sxml-file)
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(lambda (input)
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(format (current-error-port)
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"reading SXML...~%")
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(read-disable 'positions) ;; reduce memory usage
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(with-input-from-file input read)))
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(begin
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(snix (begin
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(format (current-error-port) "parsing XML...~%")
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(xml->sxml
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(or (and=> (assoc-ref opts 'xml-file)
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open-input-file)
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(open-nixpkgs path))))))
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(snix (let ((s (begin
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(format (current-error-port)
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"producing SNix tree...~%")
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(sxml->snix sxml))))
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(set! sxml #f) (gc)
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s))
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(xml->snix
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(or (and=> (assoc-ref opts 'xml-file) open-input-file)
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(open-nixpkgs path)))))
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(packages (match snix
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(('snix _ ('attribute-set attributes))
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attributes)
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