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-rw-r--r--guix/import/snix.scm467
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-;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
-;;;
-;;; This file is part of GNU Guix.
-;;;
-;;; GNU Guix is free software; you can redistribute it and/or modify it
-;;; under the terms of the GNU General Public License as published by
-;;; the Free Software Foundation; either version 3 of the License, or (at
-;;; your option) any later version.
-;;;
-;;; GNU Guix is distributed in the hope that it will be useful, but
-;;; WITHOUT ANY WARRANTY; without even the implied warranty of
-;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-;;; GNU General Public License for more details.
-;;;
-;;; You should have received a copy of the GNU General Public License
-;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
-
-(define-module (guix import snix)
- #:use-module (sxml ssax)
- #:use-module (ice-9 popen)
- #:use-module (ice-9 match)
- #:use-module (ice-9 rdelim)
- #:use-module (ice-9 format)
- #:use-module (ice-9 regex)
- #:use-module (ice-9 vlist)
- #:use-module (srfi srfi-1)
- #:use-module (srfi srfi-9)
- #:use-module (srfi srfi-11)
- #:use-module (srfi srfi-26)
- #:use-module (srfi srfi-37)
- #:use-module (system foreign)
- #:use-module (rnrs bytevectors)
-
- ;; Use the 'package-name->name+version' procedure that works with
- ;; hyphen-separate name/version, not the one that works with '@'-separated
- ;; name/version. Subtle!
- #:use-module ((guix utils) #:hide (package-name->name+version))
- #:use-module ((guix build utils) #:select (package-name->name+version))
-
- #:use-module (guix import utils)
- #:use-module (guix base16)
- #:use-module (guix base32)
- #:use-module (guix config)
- #:use-module (guix gnu-maintenance)
- #:export (open-nixpkgs
- xml->snix
- nixpkgs->guix-package))
-
-;;; Commentary:
-;;;
-;;; Converting Nix code to s-expressions, and then to Guix `package'
-;;; declarations, using the XML output of `nix-instantiate'.
-;;;
-;;; Code:
-
-
-;;;
-;;; SNix.
-;;;
-
-;; Nix object types visible in the XML output of `nix-instantiate' and
-;; mapping to S-expressions (we map to sexps, not records, so that we
-;; can do pattern matching):
-;;
-;; at (at varpat attrspat)
-;; attr (attribute loc name value)
-;; attrs (attribute-set attributes)
-;; attrspat (attribute-set-pattern patterns)
-;; bool #f|#t
-;; derivation (derivation drv-path out-path attributes)
-;; ellipsis '...
-;; expr (snix loc body ...)
-;; function (function loc at|attrspat|varpat)
-;; int int
-;; list list
-;; null 'null
-;; path string
-;; string string
-;; unevaluated 'unevaluated
-;; varpat (varpat name)
-;;
-;; Initially ATTRIBUTES in `derivation' and `attribute-set' was a promise;
-;; however, handling `repeated' nodes makes it impossible to do anything
-;; lazily because the whole SXML tree has to be traversed to maintain the
-;; list of known derivations.
-
-(define (xml-element->snix elem attributes body derivations)
- "Return an SNix element corresponding to XML element ELEM."
-
- (define (loc)
- (location (assq-ref attributes 'path)
- (assq-ref attributes 'line)
- (assq-ref attributes 'column)))
-
- (case elem
- ((at)
- (values `(at ,(car body) ,(cadr body)) derivations))
- ((attr)
- (let ((name (assq-ref attributes 'name)))
- (cond ((null? body)
- (values `(attribute-pattern ,name) derivations))
- ((and (pair? body) (null? (cdr body)))
- (values `(attribute ,(loc) ,name ,(car body))
- derivations))
- (else
- (error "invalid attribute body" name (loc) body)))))
- ((attrs)
- (values `(attribute-set ,(reverse body)) derivations))
- ((attrspat)
- (values `(attribute-set-pattern ,body) derivations))
- ((bool)
- (values (string-ci=? "true" (assq-ref attributes 'value))
- derivations))
- ((derivation)
- (let ((drv-path (assq-ref attributes 'drvPath))
- (out-path (assq-ref attributes 'outPath)))
- (if (equal? body '(repeated))
- (let ((body (vhash-assoc drv-path derivations)))
- (if (pair? body)
- (values `(derivation ,drv-path ,out-path ,(cdr body))
- derivations)
-
- ;; DRV-PATH hasn't been encountered yet but may be later
- ;; (see <http://article.gmane.org/gmane.linux.distributions.nixos/5946>.)
- ;; Return an `unresolved' node.
- (values `(unresolved
- ,(lambda (derivations)
- (let ((body (vhash-assoc drv-path derivations)))
- (if (pair? body)
- `(derivation ,drv-path ,out-path
- ,(cdr body))
- (error "no previous occurrence of derivation"
- drv-path)))))
- derivations)))
- (values `(derivation ,drv-path ,out-path ,body)
- (vhash-cons drv-path body derivations)))))
- ((ellipsis)
- (values '... derivations))
- ((expr)
- (values `(snix ,(loc) ,@body) derivations))
- ((function)
- (values `(function ,(loc) ,body) derivations))
- ((int)
- (values (string->number (assq-ref attributes 'value))
- derivations))
- ((list)
- (values body derivations))
- ((null)
- (values 'null derivations))
- ((path)
- (values (assq-ref attributes 'value) derivations))
- ((repeated)
- (values 'repeated derivations))
- ((string)
- (values (assq-ref attributes 'value) derivations))
- ((unevaluated)
- (values 'unevaluated derivations))
- ((varpat)
- (values `(varpat ,(assq-ref attributes 'name)) derivations))
- (else (error "unhandled Nix XML element" elem))))
-
-(define (resolve snix derivations)
- "Return a new SNix tree where `unresolved' nodes from SNIX have been
-replaced by the result of their application to DERIVATIONS, a vhash."
- (let loop ((node snix)
- (seen vlist-null))
- (if (vhash-assq node seen)
- (values node seen)
- (match node
- (('unresolved proc)
- (let ((n (proc derivations)))
- (values n seen)))
- ((tag body ...)
- (let ((body+seen (fold (lambda (n body+seen)
- (call-with-values
- (lambda ()
- (loop n (cdr body+seen)))
- (lambda (n* seen)
- (cons (cons n* (car body+seen))
- (vhash-consq n #t seen)))))
- (cons '() (vhash-consq node #t seen))
- body)))
- (values (cons tag (reverse (car body+seen)))
- (vhash-consq node #t (cdr body+seen)))))
- (anything
- (values anything seen))))))
-
-(define xml->snix
- (let ((parse
- (ssax:make-parser NEW-LEVEL-SEED
- (lambda (elem-gi attributes namespaces expected-content
- seed)
- (cons '() (cdr seed)))
-
- FINISH-ELEMENT
- (lambda (elem-gi attributes namespaces parent-seed
- seed)
- (let ((snix (car seed))
- (derivations (cdr seed)))
- (let-values (((snix derivations)
- (xml-element->snix elem-gi
- attributes
- snix
- derivations)))
- (cons (cons snix (car parent-seed))
- derivations))))
-
- CHAR-DATA-HANDLER
- (lambda (string1 string2 seed)
- ;; Discard inter-node strings, which are blanks.
- seed))))
- (lambda (port)
- "Return the SNix represention of TREE, an SXML tree as returned by
-parsing the XML output of `nix-instantiate' on Nixpkgs."
- (match (parse port (cons '() vlist-null))
- (((snix) . derivations)
- (resolve snix derivations))))))
-
-(define (attribute-value attribute)
- "Return the value of ATTRIBUTE."
- (match attribute
- (('attribute _ _ value) value)))
-
-(define (derivation-source derivation)
- "Return the \"src\" attribute of DERIVATION or #f if not found."
- (match derivation
- (('derivation _ _ (attributes ...))
- (find-attribute-by-name "src" attributes))))
-
-(define (derivation-output-path derivation)
- "Return the output path of DERIVATION."
- (match derivation
- (('derivation _ out-path _)
- out-path)
- (_ #f)))
-
-(define (source-output-path src)
- "Return the output path of SRC, the \"src\" attribute of a derivation."
- (derivation-output-path (attribute-value src)))
-
-(define (source-urls src)
- "Return the URLs of SRC, the \"src\" attribute of a derivation."
- (match src
- (('attribute _ _ ('derivation _ _ (attributes ...)))
- (match (find-attribute-by-name "urls" attributes)
- (('attribute _ _ value)
- value)))
- (_ #f)))
-
-(define (source-sha256 src)
- "Return the sha256 of SRC, the \"src\" attribute of a derivation, as a
-bytevector."
- (match src
- (('attribute _ _ ('derivation _ _ (attributes ...)))
- (match (find-attribute-by-name "outputHash" attributes)
- (('attribute _ _ value)
- (match value
- ((= string-length 52)
- (nix-base32-string->bytevector value))
- ((= string-length 64)
- (base16-string->bytevector value))
- (_
- (error "unsupported hash format" value))))))
- (_ #f)))
-
-(define (derivation-source-output-path derivation)
- "Return the output path of the \"src\" attribute of DERIVATION or #f
-if DERIVATION lacks an \"src\" attribute."
- (and=> (derivation-source derivation) source-output-path))
-
-(define* (open-nixpkgs nixpkgs #:optional attribute)
- "Return an input pipe to the XML representation of Nixpkgs. When
-ATTRIBUTE is true, only that attribute is considered."
- (with-fluids ((%default-port-encoding "UTF-8"))
- (let ((cross-system (format #f "{
- config = \"i686-guix-linux-gnu\";
- libc = \"glibc\";
- arch = \"guix\";
- withTLS = true;
- float = \"hard\";
- openssl.system = \"linux-generic32\";
- platform = (import ~a/pkgs/top-level/platforms.nix).sheevaplug;
-}" nixpkgs)))
- (apply open-pipe* OPEN_READ
- "nix-instantiate" "--strict" "--eval-only" "--xml"
-
- ;; Pass a dummy `crossSystem' argument so that `buildInputs' and
- ;; `nativeBuildInputs' are not coalesced.
- ;; XXX: This is hacky and has other problems.
- ;"--arg" "crossSystem" cross-system
-
- `(,@(if attribute
- `("-A" ,attribute)
- '())
- ,nixpkgs)))))
-
-(define (pipe-failed? pipe)
- "Close pipe and return its status if it failed."
- (let ((status (close-pipe pipe)))
- (if (or (status:term-sig status)
- (not (= (status:exit-val status) 0)))
- status
- #f)))
-
-(define (find-attribute-by-name name attributes)
- "Return attribute NAME in ATTRIBUTES, an attribute set or list of SNix
-attributes, or #f if NAME cannot be found."
- (find (lambda (a)
- (match a
- (('attribute _ (? (cut string=? <> name)) _)
- a)
- (_ #f)))
- (match attributes
- (('attribute-set (attributes ...))
- attributes)
- (_
- attributes))))
-
-(define (license-variable license)
- "Return the name of the (guix licenses) variable for LICENSE."
- (match license
- ("GPLv2+" 'gpl2+)
- ("GPLv3+" 'gpl3+)
- ("LGPLv2+" 'lgpl2.1+)
- ("LGPLv2.1+" 'lgpl2.1+)
- ("LGPLv3+" 'lgpl3+)
- (('attribute-set _ ...)
- ;; At some point in 2013, Nixpkgs switched to attribute sets to represent
- ;; licenses. These are listed in lib/licenses.nix.
- (match (and=> (find-attribute-by-name "shortName" license)
- attribute-value)
- ("agpl3Plus" 'agpl3+)
- ("gpl2Plus" 'gpl2+)
- ("gpl3Plus" 'gpl3+)
- ("lgpl2Plus" 'lgpl2.0+)
- ("lgpl21Plus" 'lgpl2.1+)
- ("lgpl3Plus" 'lgpl3+)
- ((? string? x) x)
- (_ license)))
- (_ license)))
-
-(define (package-source-output-path package)
- "Return the output path of the \"src\" derivation of PACKAGE."
- (derivation-source-output-path (attribute-value package)))
-
-
-;;;
-;;; Conversion of "Nix expressions" to "Guix expressions".
-;;;
-
-(define (snix-derivation->guix-package derivation)
- "Return the `package' s-expression corresponding to SNix DERIVATION, a
-Nixpkgs `stdenv.mkDerivation'-style derivation, and the original source
-location of DERIVATION."
- (match derivation
- (('derivation _ _ (attributes ...))
- (let*-values (((full-name loc)
- (match (find-attribute-by-name "name" attributes)
- (('attribute loc _ value)
- (values value loc))
- (_
- (values #f #f))))
- ((name version)
- (package-name->name+version full-name)))
- (define (convert-inputs type)
- ;; Convert the derivation's input from a list of SNix derivations to
- ;; a list of name/variable pairs.
- (match (and=> (find-attribute-by-name type attributes)
- attribute-value)
- (#f
- '())
- ((inputs ...)
- ;; Inputs can be either derivations or the null value.
- (filter-map (match-lambda
- (('derivation _ _ (attributes ...))
- (let* ((full-name
- (attribute-value
- (find-attribute-by-name "name" attributes)))
- (name (package-name->name+version full-name)))
- (list name
- (list 'unquote (string->symbol name)))))
- ('null #f))
- inputs))))
-
- (define (maybe-inputs guix-name inputs)
- (match inputs
- (()
- '())
- ((inputs ...)
- (list (list guix-name
- (list 'quasiquote inputs))))))
-
- (define (pretty-uri uri version)
- (if version
- (match (factorize-uri uri version)
- ((items ...)
- `(string-append ,@items))
- (x x))
- uri))
-
- (let* ((source (find-attribute-by-name "src" attributes))
- (urls (source-urls source))
- (sha256 (source-sha256 source))
- (meta (and=> (find-attribute-by-name "meta" attributes)
- attribute-value)))
- (values
- `(package
- (name ,name)
- (version ,version)
- (source (origin
- (method url-fetch)
- (uri ,(pretty-uri (car urls) version))
- (sha256
- (base32
- ,(bytevector->nix-base32-string sha256)))))
- (build-system gnu-build-system)
-
- ;; When doing a native Nixpkgs build, `buildInputs' is empty and
- ;; everything is in `nativeBuildInputs'. So we can't distinguish
- ;; between both, here.
- ;;
- ;; Note that `nativeBuildInputs' was renamed from
- ;; `buildNativeInputs' in Nixpkgs sometime around March 2013.
- ,@(maybe-inputs 'inputs
- (convert-inputs "nativeBuildInputs"))
- ,@(maybe-inputs 'propagated-inputs
- (convert-inputs "propagatedNativeBuildInputs"))
-
- (home-page ,(and=> (find-attribute-by-name "homepage" meta)
- attribute-value))
- (synopsis
- ;; For GNU packages, prefer the official synopsis.
- ,(or (false-if-exception
- (and=> (find (lambda (gnu-package)
- (equal? (gnu-package-name gnu-package)
- name))
- (official-gnu-packages))
- gnu-package-doc-summary))
- (and=> (find-attribute-by-name "description" meta)
- attribute-value)))
- (description
- ;; Likewise, prefer the official description of GNU packages.
- ,(or (false-if-exception
- (and=> (find (lambda (gnu-package)
- (equal? (gnu-package-name gnu-package)
- name))
- (official-gnu-packages))
- gnu-package-doc-description))
- (and=> (find-attribute-by-name "longDescription" meta)
- attribute-value)))
- (license ,(and=> (find-attribute-by-name "license" meta)
- (compose license-variable attribute-value))))
- loc))))))
-
-(define (nixpkgs->guix-package nixpkgs attribute)
- "Evaluate ATTRIBUTE in NIXPKGS, the file name of a Nixpkgs checkout,
-and return the `package' s-expression corresponding to that package."
- (let ((port (open-nixpkgs nixpkgs attribute)))
- (match (xml->snix port)
- (('snix loc (and drv ('derivation _ ...)))
- (and (not (pipe-failed? port))
- (snix-derivation->guix-package drv)))
- (_
- (not (pipe-failed? port))))))
-
-;;; snix.scm ends here
generated by cgit v1.2.3 (git 2.46.2) at 2024-11-12 10:21:40 +0000