874e687428
* doc/guix.texi (Defining Packages): Add cross-reference to "Derivations". (The Store): Add `build-derivations'. (Derivations): Populate.
737 lines
31 KiB
Scheme
737 lines
31 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU 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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;;; GNU 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 GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix derivations)
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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 (rnrs io ports)
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#:use-module (rnrs bytevectors)
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#:use-module (ice-9 match)
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#:use-module (ice-9 rdelim)
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#:use-module (guix store)
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#:use-module (guix utils)
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#:use-module (guix base32)
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#:export (<derivation>
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derivation?
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derivation-outputs
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derivation-inputs
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derivation-sources
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derivation-system
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derivation-builder-arguments
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derivation-builder-environment-vars
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derivation-prerequisites
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derivation-prerequisites-to-build
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<derivation-output>
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derivation-output?
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derivation-output-path
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derivation-output-hash-algo
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derivation-output-hash
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<derivation-input>
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derivation-input?
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derivation-input-path
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derivation-input-sub-derivations
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fixed-output-derivation?
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derivation-hash
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read-derivation
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write-derivation
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derivation-path->output-path
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derivation-path->output-paths
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derivation
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%guile-for-build
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build-expression->derivation
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imported-files))
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;;;
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;;; Nix derivations, as implemented in Nix's `derivations.cc'.
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;;;
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(define-record-type <derivation>
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(make-derivation outputs inputs sources system builder args env-vars)
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derivation?
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(outputs derivation-outputs) ; list of name/<derivation-output> pairs
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(inputs derivation-inputs) ; list of <derivation-input>
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(sources derivation-sources) ; list of store paths
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(system derivation-system) ; string
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(builder derivation-builder) ; store path
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(args derivation-builder-arguments) ; list of strings
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(env-vars derivation-builder-environment-vars)) ; list of name/value pairs
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(define-record-type <derivation-output>
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(make-derivation-output path hash-algo hash)
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derivation-output?
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(path derivation-output-path) ; store path
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(hash-algo derivation-output-hash-algo) ; symbol | #f
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(hash derivation-output-hash)) ; bytevector | #f
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(define-record-type <derivation-input>
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(make-derivation-input path sub-derivations)
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derivation-input?
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(path derivation-input-path) ; store path
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(sub-derivations derivation-input-sub-derivations)) ; list of strings
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(define (fixed-output-derivation? drv)
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"Return #t if DRV is a fixed-output derivation, such as the result of a
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download with a fixed hash (aka. `fetchurl')."
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(match drv
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(($ <derivation>
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(($ <derivation-output> _ (? symbol?) (? string?))))
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#t)
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(_ #f)))
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(define (derivation-prerequisites drv)
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"Return the list of derivation-inputs required to build DRV, recursively."
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(let loop ((drv drv)
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(result '()))
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(let ((inputs (remove (cut member <> result) ; XXX: quadratic
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(derivation-inputs drv))))
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(fold loop
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(append inputs result)
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(map (lambda (i)
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(call-with-input-file (derivation-input-path i)
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read-derivation))
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inputs)))))
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(define* (derivation-prerequisites-to-build store drv
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#:key (outputs
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(map
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car
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(derivation-outputs drv))))
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"Return the list of derivation-inputs required to build the OUTPUTS of
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DRV and not already available in STORE, recursively."
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(define built?
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(cut valid-path? store <>))
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(define input-built?
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(match-lambda
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(($ <derivation-input> path sub-drvs)
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(let ((out (map (cut derivation-path->output-path path <>)
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sub-drvs)))
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(any built? out)))))
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(define (derivation-built? drv sub-drvs)
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(match drv
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(($ <derivation> outputs)
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(let ((paths (map (lambda (sub-drv)
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(derivation-output-path
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(assoc-ref outputs sub-drv)))
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sub-drvs)))
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(every built? paths)))))
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(let loop ((drv drv)
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(sub-drvs outputs)
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(result '()))
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(if (derivation-built? drv sub-drvs)
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result
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(let ((inputs (remove (lambda (i)
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(or (member i result) ; XXX: quadratic
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(input-built? i)))
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(derivation-inputs drv))))
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(fold loop
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(append inputs result)
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(map (lambda (i)
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(call-with-input-file (derivation-input-path i)
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read-derivation))
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inputs)
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(map derivation-input-sub-derivations inputs))))))
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(define (read-derivation drv-port)
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"Read the derivation from DRV-PORT and return the corresponding
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<derivation> object."
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(define comma (string->symbol ","))
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(define (ununquote x)
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(match x
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(('unquote x) (ununquote x))
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((x ...) (map ununquote x))
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(_ x)))
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(define (outputs->alist x)
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(fold-right (lambda (output result)
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(match output
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((name path "" "")
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(alist-cons name
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(make-derivation-output path #f #f)
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result))
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((name path hash-algo hash)
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;; fixed-output
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(let ((algo (string->symbol hash-algo))
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(hash (base16-string->bytevector hash)))
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(alist-cons name
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(make-derivation-output path algo hash)
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result)))))
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'()
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x))
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(define (make-input-drvs x)
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(fold-right (lambda (input result)
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(match input
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((path (sub-drvs ...))
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(cons (make-derivation-input path sub-drvs)
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result))))
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'()
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x))
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;; The contents of a derivation are typically ASCII, but choosing
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;; UTF-8 allows us to take the fast path for Guile's `scm_getc'.
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(set-port-encoding! drv-port "UTF-8")
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(let loop ((exp (read drv-port))
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(result '()))
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(match exp
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((? eof-object?)
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(let ((result (reverse result)))
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(match result
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(('Derive ((outputs ...) (input-drvs ...)
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(input-srcs ...)
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(? string? system)
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(? string? builder)
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((? string? args) ...)
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((var value) ...)))
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(make-derivation (outputs->alist outputs)
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(make-input-drvs input-drvs)
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input-srcs
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system builder args
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(fold-right alist-cons '() var value)))
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(_
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(error "failed to parse derivation" drv-port result)))))
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((? (cut eq? <> comma))
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(loop (read drv-port) result))
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(_
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(loop (read drv-port)
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(cons (ununquote exp) result))))))
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(define (write-derivation drv port)
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"Write the ATerm-like serialization of DRV to PORT. See Section 2.4 of
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Eelco Dolstra's PhD dissertation for an overview of a previous version of
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that form."
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;; Make sure we're using the faster implementation.
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(define format simple-format)
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(define (list->string lst)
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(string-append "[" (string-join lst ",") "]"))
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(define (write-list lst)
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(display (list->string lst) port))
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(define (coalesce-duplicate-inputs inputs)
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;; Return a list of inputs, such that when INPUTS contains the same DRV
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;; twice, they are coalesced, with their sub-derivations merged. This is
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;; needed because Nix itself keeps only one of them.
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(fold (lambda (input result)
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(match input
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(($ <derivation-input> path sub-drvs)
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;; XXX: quadratic
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(match (find (match-lambda
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(($ <derivation-input> p s)
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(string=? p path)))
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result)
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(#f
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(cons input result))
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((and dup ($ <derivation-input> _ sub-drvs2))
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;; Merge DUP with INPUT.
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(let ((sub-drvs (delete-duplicates
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(append sub-drvs sub-drvs2))))
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(cons (make-derivation-input path sub-drvs)
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(delq dup result))))))))
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'()
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inputs))
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;; Note: lists are sorted alphabetically, to conform with the behavior of
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;; C++ `std::map' in Nix itself.
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(match drv
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(($ <derivation> outputs inputs sources
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system builder args env-vars)
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(display "Derive(" port)
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(write-list (map (match-lambda
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((name . ($ <derivation-output> path hash-algo hash))
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(format #f "(~s,~s,~s,~s)"
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name path
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(or (and=> hash-algo symbol->string) "")
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(or (and=> hash bytevector->base16-string)
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""))))
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(sort outputs
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(lambda (o1 o2)
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(string<? (car o1) (car o2))))))
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(display "," port)
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(write-list (map (match-lambda
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(($ <derivation-input> path sub-drvs)
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(format #f "(~s,~a)" path
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(list->string (map object->string
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(sort sub-drvs string<?))))))
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(sort (coalesce-duplicate-inputs inputs)
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(lambda (i1 i2)
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(string<? (derivation-input-path i1)
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(derivation-input-path i2))))))
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(display "," port)
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(write-list (map object->string (sort sources string<?)))
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(format port ",~s,~s," system builder)
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(write-list (map object->string args))
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(display "," port)
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(write-list (map (match-lambda
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((name . value)
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(format #f "(~s,~s)" name value)))
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(sort env-vars
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(lambda (e1 e2)
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(string<? (car e1) (car e2))))))
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(display ")" port))))
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(define derivation-path->output-path
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;; This procedure is called frequently, so memoize it.
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(memoize
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(lambda* (path #:optional (output "out"))
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"Read the derivation from PATH (`/nix/store/xxx.drv'), and return the store
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path of its output OUTPUT."
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(let* ((drv (call-with-input-file path read-derivation))
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(outputs (derivation-outputs drv)))
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(and=> (assoc-ref outputs output) derivation-output-path)))))
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(define (derivation-path->output-paths path)
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"Read the derivation from PATH (`/nix/store/xxx.drv'), and return the
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list of name/path pairs of its outputs."
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(let* ((drv (call-with-input-file path read-derivation))
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(outputs (derivation-outputs drv)))
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(map (match-lambda
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((name . output)
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(cons name (derivation-output-path output))))
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outputs)))
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;;;
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;;; Derivation primitive.
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;;;
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(define (compressed-hash bv size) ; `compressHash'
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"Given the hash stored in BV, return a compressed version thereof that fits
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in SIZE bytes."
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(define new (make-bytevector size 0))
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(define old-size (bytevector-length bv))
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(let loop ((i 0))
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(if (= i old-size)
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new
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(let* ((j (modulo i size))
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(o (bytevector-u8-ref new j)))
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(bytevector-u8-set! new j
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(logxor o (bytevector-u8-ref bv i)))
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(loop (+ 1 i))))))
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(define derivation-hash ; `hashDerivationModulo' in derivations.cc
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(memoize
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(lambda (drv)
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"Return the hash of DRV, modulo its fixed-output inputs, as a bytevector."
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(match drv
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(($ <derivation> ((_ . ($ <derivation-output> path
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(? symbol? hash-algo) (? bytevector? hash)))))
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;; A fixed-output derivation.
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(sha256
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(string->utf8
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(string-append "fixed:out:" (symbol->string hash-algo)
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":" (bytevector->base16-string hash)
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":" path))))
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(($ <derivation> outputs inputs sources
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system builder args env-vars)
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;; A regular derivation: replace the path of each input with that
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;; input's hash; return the hash of serialization of the resulting
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;; derivation.
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(let* ((inputs (map (match-lambda
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(($ <derivation-input> path sub-drvs)
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(let ((hash (call-with-input-file path
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(compose bytevector->base16-string
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derivation-hash
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read-derivation))))
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(make-derivation-input hash sub-drvs))))
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inputs))
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(drv (make-derivation outputs inputs sources
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system builder args env-vars)))
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(sha256
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(string->utf8 (call-with-output-string
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(cut write-derivation drv <>))))))))))
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(define (store-path type hash name) ; makeStorePath
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"Return the store path for NAME/HASH/TYPE."
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(let* ((s (string-append type ":sha256:"
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(bytevector->base16-string hash) ":"
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(%store-prefix) ":" name))
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(h (sha256 (string->utf8 s)))
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(c (compressed-hash h 20)))
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(string-append (%store-prefix) "/"
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(bytevector->nix-base32-string c) "-"
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name)))
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(define (output-path output hash name) ; makeOutputPath
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"Return an output path for OUTPUT (the name of the output as a string) of
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the derivation called NAME with hash HASH."
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(store-path (string-append "output:" output) hash
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(if (string=? output "out")
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name
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(string-append name "-" output))))
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(define* (derivation store name system builder args env-vars inputs
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#:key (outputs '("out")) hash hash-algo hash-mode)
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"Build a derivation with the given arguments. Return the resulting
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store path and <derivation> object. When HASH, HASH-ALGO, and HASH-MODE
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are given, a fixed-output derivation is created---i.e., one whose result is
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known in advance, such as a file download."
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(define direct-store-path?
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(let ((len (+ 1 (string-length (%store-prefix)))))
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(lambda (p)
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;; Return #t if P is a store path, and not a sub-directory of a
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;; store path. This predicate is needed because files *under* a
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;; store path are not valid inputs.
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(and (store-path? p)
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(not (string-index (substring p len) #\/))))))
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(define (add-output-paths drv)
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;; Return DRV with an actual store path for each of its output and the
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;; corresponding environment variable.
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(match drv
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(($ <derivation> outputs inputs sources
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system builder args env-vars)
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(let* ((drv-hash (derivation-hash drv))
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(outputs (map (match-lambda
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((output-name . ($ <derivation-output>
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_ algo hash))
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(let ((path (output-path output-name
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drv-hash name)))
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(cons output-name
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(make-derivation-output path algo
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hash)))))
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outputs)))
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(make-derivation outputs inputs sources system builder args
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(map (match-lambda
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((name . value)
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(cons name
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(or (and=> (assoc-ref outputs name)
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derivation-output-path)
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value))))
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env-vars))))))
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(define (env-vars-with-empty-outputs)
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;; Return a variant of ENV-VARS where each OUTPUTS is associated with an
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;; empty string, even outputs that do not appear in ENV-VARS.
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(let ((e (map (match-lambda
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((name . val)
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(if (member name outputs)
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(cons name "")
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(cons name val))))
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env-vars)))
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(fold (lambda (output-name env-vars)
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(if (assoc output-name env-vars)
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env-vars
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(append env-vars `((,output-name . "")))))
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e
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outputs)))
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(let* ((outputs (map (lambda (name)
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;; Return outputs with an empty path.
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(cons name
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(make-derivation-output "" hash-algo hash)))
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outputs))
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(inputs (map (match-lambda
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(((? direct-store-path? input))
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(make-derivation-input input '("out")))
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(((? direct-store-path? input) sub-drvs ...)
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(make-derivation-input input sub-drvs))
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((input . _)
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(let ((path (add-to-store store
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(basename input)
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#t #t "sha256" input)))
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(make-derivation-input path '()))))
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(delete-duplicates inputs)))
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(env-vars (env-vars-with-empty-outputs))
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(drv-masked (make-derivation outputs
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(filter (compose derivation-path?
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derivation-input-path)
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inputs)
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(filter-map (lambda (i)
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(let ((p (derivation-input-path i)))
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(and (not (derivation-path? p))
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p)))
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inputs)
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system builder args env-vars))
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(drv (add-output-paths drv-masked)))
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;; (write-derivation drv-masked (current-error-port))
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;; (newline (current-error-port))
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(values (add-text-to-store store (string-append name ".drv")
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(call-with-output-string
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(cut write-derivation drv <>))
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(map derivation-input-path
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inputs))
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drv)))
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;;;
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;;; Guile-based builders.
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;;;
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(define %guile-for-build
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;; The derivation of the Guile to be used within the build environment,
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;; when using `build-expression->derivation'.
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(make-parameter #f))
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(define (parent-directories file-name)
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"Return the list of parent dirs of FILE-NAME, in the order in which an
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`mkdir -p' implementation would make them."
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(let ((not-slash (char-set-complement (char-set #\/))))
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(reverse
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(fold (lambda (dir result)
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(match result
|
||
(()
|
||
(list dir))
|
||
((prev _ ...)
|
||
(cons (string-append prev "/" dir)
|
||
result))))
|
||
'()
|
||
(remove (cut string=? <> ".")
|
||
(string-tokenize (dirname file-name) not-slash))))))
|
||
|
||
(define* (imported-files store files
|
||
#:key (name "file-import")
|
||
(system (%current-system))
|
||
(guile (%guile-for-build)))
|
||
"Return a derivation that imports FILES into STORE. FILES must be a list
|
||
of (FINAL-PATH . FILE-NAME) pairs; each FILE-NAME is read from the file
|
||
system, imported, and appears under FINAL-PATH in the resulting store path."
|
||
(let* ((files (map (match-lambda
|
||
((final-path . file-name)
|
||
(list final-path
|
||
(add-to-store store (basename final-path) #t #f
|
||
"sha256" file-name))))
|
||
files))
|
||
(builder
|
||
`(begin
|
||
(mkdir %output) (chdir %output)
|
||
,@(append-map (match-lambda
|
||
((final-path store-path)
|
||
(append (match (parent-directories final-path)
|
||
(() '())
|
||
((head ... tail)
|
||
(append (map (lambda (d)
|
||
`(false-if-exception
|
||
(mkdir ,d)))
|
||
head)
|
||
`((or (file-exists? ,tail)
|
||
(mkdir ,tail))))))
|
||
`((symlink ,store-path ,final-path)))))
|
||
files))))
|
||
(build-expression->derivation store name system
|
||
builder files
|
||
#:guile-for-build guile)))
|
||
|
||
(define* (imported-modules store modules
|
||
#:key (name "module-import")
|
||
(system (%current-system))
|
||
(guile (%guile-for-build)))
|
||
"Return a derivation that contains the source files of MODULES, a list of
|
||
module names such as `(ice-9 q)'. All of MODULES must be in the current
|
||
search path."
|
||
;; TODO: Determine the closure of MODULES, build the `.go' files,
|
||
;; canonicalize the source files through read/write, etc.
|
||
(let ((files (map (lambda (m)
|
||
(let ((f (string-append
|
||
(string-join (map symbol->string m) "/")
|
||
".scm")))
|
||
(cons f (search-path %load-path f))))
|
||
modules)))
|
||
(imported-files store files #:name name #:system system
|
||
#:guile guile)))
|
||
|
||
(define* (compiled-modules store modules
|
||
#:key (name "module-import-compiled")
|
||
(system (%current-system))
|
||
(guile (%guile-for-build)))
|
||
"Return a derivation that builds a tree containing the `.go' files
|
||
corresponding to MODULES. All the MODULES are built in a context where
|
||
they can refer to each other."
|
||
(let* ((module-drv (imported-modules store modules
|
||
#:system system
|
||
#:guile guile))
|
||
(module-dir (derivation-path->output-path module-drv))
|
||
(files (map (lambda (m)
|
||
(let ((f (string-join (map symbol->string m)
|
||
"/")))
|
||
(cons (string-append f ".go")
|
||
(string-append module-dir "/" f ".scm"))))
|
||
modules)))
|
||
(define builder
|
||
`(begin
|
||
(use-modules (system base compile))
|
||
(let ((out (assoc-ref %outputs "out")))
|
||
(mkdir out)
|
||
(chdir out))
|
||
|
||
(set! %load-path
|
||
(cons ,module-dir %load-path))
|
||
|
||
,@(map (match-lambda
|
||
((output . input)
|
||
(let ((make-parent-dirs (map (lambda (dir)
|
||
`(unless (file-exists? ,dir)
|
||
(mkdir ,dir)))
|
||
(parent-directories output))))
|
||
`(begin
|
||
,@make-parent-dirs
|
||
(compile-file ,input
|
||
#:output-file ,output
|
||
#:opts %auto-compilation-options)))))
|
||
files)))
|
||
|
||
(build-expression->derivation store name system builder
|
||
`(("modules" ,module-drv))
|
||
#:guile-for-build guile)))
|
||
|
||
(define* (build-expression->derivation store name system exp inputs
|
||
#:key (outputs '("out"))
|
||
hash hash-algo
|
||
(env-vars '())
|
||
(modules '())
|
||
guile-for-build)
|
||
"Return a derivation that executes Scheme expression EXP as a builder
|
||
for derivation NAME. INPUTS must be a list of (NAME DRV-PATH SUB-DRV)
|
||
tuples; when SUB-DRV is omitted, \"out\" is assumed. MODULES is a list
|
||
of names of Guile modules from the current search path to be copied in
|
||
the store, compiled, and made available in the load path during the
|
||
execution of EXP.
|
||
|
||
EXP is evaluated in an environment where %OUTPUT is bound to the main
|
||
output path, %OUTPUTS is bound to a list of output/path pairs, and where
|
||
%BUILD-INPUTS is bound to an alist of string/output-path pairs made from
|
||
INPUTS. Optionally, ENV-VARS is a list of string pairs specifying the
|
||
name and value of environment variables visible to the builder. The
|
||
builder terminates by passing the result of EXP to `exit'; thus, when
|
||
EXP returns #f, the build is considered to have failed.
|
||
|
||
EXP is built using GUILE-FOR-BUILD (a derivation). When GUILE-FOR-BUILD is
|
||
omitted or is #f, the value of the `%guile-for-build' fluid is used instead."
|
||
(define guile-drv
|
||
(or guile-for-build (%guile-for-build)))
|
||
|
||
(define guile
|
||
(string-append (derivation-path->output-path guile-drv)
|
||
"/bin/guile"))
|
||
|
||
(define module-form?
|
||
(match-lambda
|
||
(((or 'define-module 'use-modules) _ ...) #t)
|
||
(_ #f)))
|
||
|
||
(define source-path
|
||
;; When passed an input that is a source, return its path; otherwise
|
||
;; return #f.
|
||
(match-lambda
|
||
((_ path _ ...)
|
||
(and (not (derivation-path? path))
|
||
path))))
|
||
|
||
(let* ((prologue `(begin
|
||
,@(match exp
|
||
((_ ...)
|
||
;; Module forms must appear at the top-level so
|
||
;; that any macros they export can be expanded.
|
||
(filter module-form? exp))
|
||
(_ `(,exp)))
|
||
|
||
(define %output (getenv "out"))
|
||
(define %outputs
|
||
(map (lambda (o)
|
||
(cons o (getenv o)))
|
||
',outputs))
|
||
(define %build-inputs
|
||
',(map (match-lambda
|
||
((name drv . rest)
|
||
(let ((sub (match rest
|
||
(() "out")
|
||
((x) x))))
|
||
(cons name
|
||
(if (derivation-path? drv)
|
||
(derivation-path->output-path drv
|
||
sub)
|
||
drv)))))
|
||
inputs))
|
||
|
||
,@(if (null? modules)
|
||
'()
|
||
;; Remove our own settings.
|
||
'((unsetenv "GUILE_LOAD_COMPILED_PATH")))
|
||
|
||
;; Guile sets it, but remove it to avoid conflicts when
|
||
;; building Guile-using packages.
|
||
(unsetenv "LD_LIBRARY_PATH")))
|
||
(builder (add-text-to-store store
|
||
(string-append name "-guile-builder")
|
||
(string-append
|
||
(object->string prologue)
|
||
(object->string
|
||
`(exit
|
||
,(match exp
|
||
((_ ...)
|
||
(remove module-form? exp))
|
||
(_ `(,exp))))))
|
||
|
||
;; The references don't really matter
|
||
;; since the builder is always used in
|
||
;; conjunction with the drv that needs
|
||
;; it. For clarity, we add references
|
||
;; to the subset of INPUTS that are
|
||
;; sources, avoiding references to other
|
||
;; .drv; otherwise, BUILDER's hash would
|
||
;; depend on those, even if they are
|
||
;; fixed-output.
|
||
(filter-map source-path inputs)))
|
||
|
||
(mod-drv (and (pair? modules)
|
||
(imported-modules store modules
|
||
#:guile guile-drv
|
||
#:system system)))
|
||
(mod-dir (and mod-drv
|
||
(derivation-path->output-path mod-drv)))
|
||
(go-drv (and (pair? modules)
|
||
(compiled-modules store modules
|
||
#:guile guile-drv
|
||
#:system system)))
|
||
(go-dir (and go-drv
|
||
(derivation-path->output-path go-drv))))
|
||
(derivation store name system guile
|
||
`("--no-auto-compile"
|
||
,@(if mod-dir `("-L" ,mod-dir) '())
|
||
,builder)
|
||
|
||
;; When MODULES is non-empty, shamelessly clobber
|
||
;; $GUILE_LOAD_COMPILED_PATH.
|
||
(if go-dir
|
||
`(("GUILE_LOAD_COMPILED_PATH" . ,go-dir)
|
||
,@(alist-delete "GUILE_LOAD_COMPILED_PATH"
|
||
env-vars))
|
||
env-vars)
|
||
|
||
`((,(or guile-for-build (%guile-for-build)))
|
||
(,builder)
|
||
,@(map cdr inputs)
|
||
,@(if mod-drv `((,mod-drv) (,go-drv)) '()))
|
||
#:hash hash #:hash-algo hash-algo
|
||
#:outputs outputs)))
|