406 lines
15 KiB
Scheme
406 lines
15 KiB
Scheme
;;; Guix --- Nix package management from Guile. -*- coding: utf-8 -*-
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;;; Copyright (C) 2012 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of Guix.
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;;;
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;;; Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix utils)
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#:use-module (guix config)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-9)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-39)
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#:use-module (srfi srfi-60)
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#:use-module (rnrs bytevectors)
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#:use-module ((rnrs io ports) #:select (put-bytevector))
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#:use-module (ice-9 vlist)
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#:use-module (ice-9 format)
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#:autoload (ice-9 popen) (open-pipe*)
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#:autoload (ice-9 rdelim) (read-line)
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#:use-module (ice-9 regex)
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#:use-module (ice-9 match)
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#:use-module (ice-9 format)
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#:autoload (system foreign) (pointer->procedure)
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#:export (bytevector->base16-string
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base16-string->bytevector
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sha256
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%nixpkgs-directory
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nixpkgs-derivation
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nixpkgs-derivation*
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define-record-type*
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compile-time-value
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memoize
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default-keyword-arguments
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substitute-keyword-arguments
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<location>
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location
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location?
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location-file
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location-line
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location-column
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source-properties->location
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gnu-triplet->nix-system
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%current-system
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package-name->name+version))
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;;;
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;;; Compile-time computations.
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;;;
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(define-syntax compile-time-value
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(syntax-rules ()
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"Evaluate the given expression at compile time. The expression must
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evaluate to a simple datum."
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((_ exp)
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(let-syntax ((v (lambda (s)
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(let ((val exp))
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(syntax-case s ()
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(_ #`'#,(datum->syntax s val)))))))
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v))))
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;;;
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;;; Base 16.
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;;;
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(define (bytevector->base16-string bv)
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"Return the hexadecimal representation of BV's contents."
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(define len
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(bytevector-length bv))
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(let-syntax ((base16-chars (lambda (s)
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(syntax-case s ()
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(_
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(let ((v (list->vector
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(unfold (cut > <> 255)
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(lambda (n)
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(format #f "~2,'0x" n))
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1+
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0))))
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v))))))
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(define chars base16-chars)
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(let loop ((i 0)
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(r '()))
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(if (= i len)
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(string-concatenate-reverse r)
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(loop (+ 1 i)
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(cons (vector-ref chars (bytevector-u8-ref bv i)) r))))))
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(define base16-string->bytevector
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(let ((chars->value (fold (lambda (i r)
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(vhash-consv (string-ref (number->string i 16)
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0)
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i r))
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vlist-null
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(iota 16))))
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(lambda (s)
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"Return the bytevector whose hexadecimal representation is string S."
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(define bv
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(make-bytevector (quotient (string-length s) 2) 0))
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(string-fold (lambda (chr i)
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(let ((j (quotient i 2))
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(v (and=> (vhash-assv chr chars->value) cdr)))
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(if v
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(if (zero? (logand i 1))
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(bytevector-u8-set! bv j
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(arithmetic-shift v 4))
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(let ((w (bytevector-u8-ref bv j)))
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(bytevector-u8-set! bv j (logior v w))))
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(error "invalid hexadecimal character" chr)))
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(+ i 1))
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0
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s)
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bv)))
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;;;
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;;; Hash.
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;;;
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(define sha256
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(let ((hash (pointer->procedure void
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(dynamic-func "gcry_md_hash_buffer"
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(dynamic-link %libgcrypt))
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`(,int * * ,size_t)))
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(sha256 8)) ; GCRY_MD_SHA256, as of 1.5.0
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(lambda (bv)
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"Return the SHA256 of BV as a bytevector."
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(let ((digest (make-bytevector (/ 256 8))))
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(hash sha256 (bytevector->pointer digest)
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(bytevector->pointer bv) (bytevector-length bv))
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digest))))
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;;;
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;;; Nixpkgs.
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;;;
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(define %nixpkgs-directory
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(make-parameter
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;; Capture the build-time value of $NIXPKGS.
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(or %nixpkgs
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(and=> (getenv "NIXPKGS")
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(lambda (val)
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;; Bail out when passed an empty string, otherwise
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;; `nix-instantiate' will sit there and attempt to read
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;; from its standard input.
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(if (string=? val "")
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#f
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val))))))
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(define* (nixpkgs-derivation attribute #:optional (system (%current-system)))
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"Return the derivation path of ATTRIBUTE in Nixpkgs."
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(let* ((p (open-pipe* OPEN_READ (or (getenv "NIX_INSTANTIATE")
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%nix-instantiate)
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"-A" attribute (%nixpkgs-directory)
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"--argstr" "system" system))
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(l (read-line p))
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(s (close-pipe p)))
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(and (zero? (status:exit-val s))
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(not (eof-object? l))
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l)))
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(define-syntax-rule (nixpkgs-derivation* attribute)
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"Evaluate the given Nixpkgs derivation at compile-time."
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(compile-time-value (nixpkgs-derivation attribute)))
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;;;
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;;; Miscellaneous.
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;;;
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(define-syntax define-record-type*
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(lambda (s)
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"Define the given record type such that an additional \"syntactic
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constructor\" is defined, which allows instances to be constructed with named
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field initializers, à la SRFI-35, as well as default values."
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(define (make-syntactic-constructor type name ctor fields defaults)
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"Make the syntactic constructor NAME for TYPE, that calls CTOR, and
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expects all of FIELDS to be initialized. DEFAULTS is the list of
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FIELD/DEFAULT-VALUE tuples."
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(with-syntax ((type type)
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(name name)
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(ctor ctor)
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(expected fields)
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(defaults defaults))
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#`(define-syntax name
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(lambda (s)
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(define (record-inheritance orig-record field+value)
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;; Produce code that returns a record identical to
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;; ORIG-RECORD, except that values for the FIELD+VALUE alist
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;; prevail.
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(define (field-inherited-value f)
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(and=> (find (lambda (x)
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(eq? f (car (syntax->datum x))))
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field+value)
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car))
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#`(make-struct type 0
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#,@(map (lambda (field index)
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(or (field-inherited-value field)
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#`(struct-ref #,orig-record
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#,index)))
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'expected
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(iota (length 'expected)))))
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(syntax-case s (inherit #,@fields)
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((_ (inherit orig-record) (field value) (... ...))
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#`(letrec* ((field value) (... ...))
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#,(record-inheritance #'orig-record
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#'((field value) (... ...)))))
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((_ (field value) (... ...))
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(let ((fields (map syntax->datum #'(field (... ...))))
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(dflt (map (match-lambda
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((f v)
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(list (syntax->datum f) v)))
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#'defaults)))
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(define (field-value f)
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(or (and=> (find (lambda (x)
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(eq? f (car (syntax->datum x))))
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#'((field value) (... ...)))
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car)
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(car (assoc-ref dflt (syntax->datum f)))))
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(let-syntax ((error*
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(syntax-rules ()
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((_ fmt args (... ...))
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(syntax-violation 'name
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(format #f fmt args
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(... ...))
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s)))))
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(let ((fields (append fields (map car dflt))))
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(cond ((lset= eq? fields 'expected)
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#`(letrec* ((field value) (... ...))
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(ctor #,@(map field-value 'expected))))
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((pair? (lset-difference eq? fields 'expected))
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(error* "extraneous field initializers ~a"
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(lset-difference eq? fields 'expected)))
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(else
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(error* "missing field initializers ~a"
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(lset-difference eq? 'expected
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fields)))))))))))))
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(define (field-default-value s)
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(syntax-case s (default)
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((field (default val) _ ...)
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(list #'field #'val))
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((field _ options ...)
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(field-default-value #'(field options ...)))
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(_ #f)))
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(syntax-case s ()
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((_ type syntactic-ctor ctor pred
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(field get options ...) ...)
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#`(begin
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(define-record-type type
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(ctor field ...)
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pred
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(field get) ...)
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#,(make-syntactic-constructor #'type #'syntactic-ctor #'ctor
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#'(field ...)
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(filter-map field-default-value
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#'((field options ...)
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...))))))))
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(define (memoize proc)
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"Return a memoizing version of PROC."
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(let ((cache (make-hash-table)))
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(lambda args
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(let ((results (hash-ref cache args)))
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(if results
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(apply values results)
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(let ((results (call-with-values (lambda ()
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(apply proc args))
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list)))
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(hash-set! cache args results)
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(apply values results)))))))
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(define (default-keyword-arguments args defaults)
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"Return ARGS augmented with any keyword/value from DEFAULTS for
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keywords not already present in ARGS."
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(let loop ((defaults defaults)
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(args args))
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(match defaults
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((kw value rest ...)
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(loop rest
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(if (assoc-ref kw args)
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args
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(cons* kw value args))))
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(()
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args))))
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(define-syntax substitute-keyword-arguments
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(syntax-rules ()
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"Return a new list of arguments where the value for keyword arg KW is
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replaced by EXP. EXP is evaluated in a context where VAR is boud to the
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previous value of the keyword argument."
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((_ original-args ((kw var) exp) ...)
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(let loop ((args original-args)
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(before '()))
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(match args
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((kw var rest (... ...))
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(loop rest (cons* exp kw before)))
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...
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((x rest (... ...))
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(loop rest (cons x before)))
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(()
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(reverse before)))))))
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(define (gnu-triplet->nix-system triplet)
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"Return the Nix system type corresponding to TRIPLET, a GNU triplet as
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returned by `config.guess'."
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(let ((triplet (cond ((string-match "^i[345]86-(.*)$" triplet)
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=>
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(lambda (m)
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(string-append "i686-" (match:substring m 1))))
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(else triplet))))
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(cond ((string-match "^([^-]+)-([^-]+-)?linux-gnu.*" triplet)
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=>
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(lambda (m)
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;; Nix omits `-gnu' for GNU/Linux.
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(string-append (match:substring m 1) "-linux")))
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((string-match "^([^-]+)-([^-]+-)?([[:alpha:]]+)([0-9]+\\.?)*$" triplet)
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=>
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(lambda (m)
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;; Nix strip the version number from names such as `gnu0.3',
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;; `darwin10.2.0', etc., and always strips the vendor part.
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(string-append (match:substring m 1) "-"
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(match:substring m 3))))
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(else triplet))))
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(define %current-system
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;; System type as expected by Nix, usually ARCHITECTURE-KERNEL.
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;; By default, this is equal to (gnu-triplet->nix-system %host-type).
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(make-parameter %system))
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(define (package-name->name+version name)
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"Given NAME, a package name like \"foo-0.9.1b\", return two values:
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\"foo\" and \"0.9.1b\". When the version part is unavailable, NAME and
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#f are returned. The first hyphen followed by a digit is considered to
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introduce the version part."
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;; See also `DrvName' in Nix.
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(define number?
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(cut char-set-contains? char-set:digit <>))
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(let loop ((chars (string->list name))
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(prefix '()))
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(match chars
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(()
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(values name #f))
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((#\- (? number? n) rest ...)
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(values (list->string (reverse prefix))
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(list->string (cons n rest))))
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((head tail ...)
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(loop tail (cons head prefix))))))
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;;;
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;;; Source location.
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;;;
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;; A source location.
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(define-record-type <location>
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(make-location file line column)
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location?
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(file location-file) ; file name
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(line location-line) ; 1-indexed line
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(column location-column)) ; 0-indexed column
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(define location
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(memoize
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(lambda (file line column)
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"Return the <location> object for the given FILE, LINE, and COLUMN."
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(and line column file
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(make-location file line column)))))
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(define (source-properties->location loc)
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"Return a location object based on the info in LOC, an alist as returned
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by Guile's `source-properties', `frame-source', `current-source-location',
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etc."
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(let ((file (assq-ref loc 'filename))
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(line (assq-ref loc 'line))
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(col (assq-ref loc 'column)))
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;; In accordance with the GCS, start line and column numbers at 1.
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(location file (and line (+ line 1)) (and col (+ col 1)))))
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