2cf0ea0dbb
* guix/gexp.scm (write-gexp): Wrap 'write' call in
'false-if-exception'.
* tests/gexp.scm ("printer", "printer vs. ungexp-splicing"): New tests.
427 lines
15 KiB
Scheme
427 lines
15 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2014 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 gexp)
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#:use-module ((guix store)
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#:select (direct-store-path?))
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#:use-module (guix monads)
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#:use-module ((guix derivations)
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#:select (derivation? derivation->output-path
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%guile-for-build derivation))
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#:use-module (guix packages)
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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-9 gnu)
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#:use-module (srfi srfi-26)
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#:use-module (ice-9 match)
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#:export (gexp
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gexp?
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gexp->derivation
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gexp->file
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gexp->script))
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;;; Commentary:
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;;;
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;;; This module implements "G-expressions", or "gexps". Gexps are like
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;;; S-expressions (sexps), with two differences:
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;;;
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;;; 1. References (un-quotations) to derivations or packages in a gexp are
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;;; replaced by the corresponding output file name;
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;;;
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;;; 2. Gexps embed information about the derivations they refer to.
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;;;
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;;; Gexps make it easy to write to files Scheme code that refers to store
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;;; items, or to write Scheme code to build derivations.
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;;;
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;;; Code:
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;; "G expressions".
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(define-record-type <gexp>
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(make-gexp references proc)
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gexp?
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(references gexp-references) ; ((DRV-OR-PKG OUTPUT) ...)
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(proc gexp-proc)) ; procedure
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(define (write-gexp gexp port)
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"Write GEXP on PORT."
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(display "#<gexp " port)
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;; Try to write the underlying sexp. Now, this trick doesn't work when
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;; doing things like (ungexp-splicing (gexp ())) because GEXP's procedure
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;; tries to use 'append' on that, which fails with wrong-type-arg.
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(false-if-exception
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(write (apply (gexp-proc gexp) (gexp-references gexp)) port))
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(format port " ~a>"
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(number->string (object-address gexp) 16)))
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(set-record-type-printer! <gexp> write-gexp)
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;; Reference to one of the derivation's outputs, for gexps used in
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;; derivations.
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(define-record-type <output-ref>
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(output-ref name)
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output-ref?
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(name output-ref-name))
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(define raw-derivation
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(store-lift derivation))
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(define (lower-inputs inputs)
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"Turn any package from INPUTS into a derivation; return the corresponding
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input list as a monadic value."
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(with-monad %store-monad
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(sequence %store-monad
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(map (match-lambda
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(((? package? package) sub-drv ...)
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(mlet %store-monad ((drv (package->derivation package)))
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(return `(,drv ,@sub-drv))))
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(((? origin? origin) sub-drv ...)
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(mlet %store-monad ((drv (origin->derivation origin)))
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(return `(,drv ,@sub-drv))))
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(input
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(return input)))
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inputs))))
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(define* (gexp->derivation name exp
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#:key
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system
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hash hash-algo recursive?
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(env-vars '())
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(modules '())
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(guile-for-build (%guile-for-build))
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references-graphs
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local-build?)
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"Return a derivation NAME that runs EXP (a gexp) with GUILE-FOR-BUILD (a
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derivation) on SYSTEM.
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Make MODULES available in the evaluation context of EXP; MODULES is a list of
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names of Guile modules from the current search path to be copied in the store,
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compiled, and made available in the load path during the execution of
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EXP---e.g., '((guix build utils) (guix build gnu-build-system)).
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The other arguments are as for 'derivation'."
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(define %modules modules)
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(define outputs (gexp-outputs exp))
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(mlet* %store-monad ((inputs (lower-inputs (gexp-inputs exp)))
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(system -> (or system (%current-system)))
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(sexp (gexp->sexp exp))
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(builder (text-file (string-append name "-builder")
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(object->string sexp)))
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(modules (if (pair? %modules)
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(imported-modules %modules
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#:system system
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#:guile guile-for-build)
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(return #f)))
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(compiled (if (pair? %modules)
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(compiled-modules %modules
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#:system system
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#:guile guile-for-build)
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(return #f)))
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(guile (if guile-for-build
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(return guile-for-build)
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(package->derivation (default-guile)
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system))))
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(raw-derivation name
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(string-append (derivation->output-path guile)
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"/bin/guile")
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`("--no-auto-compile"
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,@(if (pair? %modules)
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`("-L" ,(derivation->output-path modules)
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"-C" ,(derivation->output-path compiled))
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'())
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,builder)
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#:outputs outputs
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#:env-vars env-vars
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#:system system
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#:inputs `((,guile)
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(,builder)
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,@(if modules
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`((,modules) (,compiled) ,@inputs)
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inputs))
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#:hash hash #:hash-algo hash-algo #:recursive? recursive?
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#:references-graphs references-graphs
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#:local-build? local-build?)))
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(define (gexp-inputs exp)
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"Return the input list for EXP."
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(define (add-reference-inputs ref result)
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(match ref
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(((? derivation?) (? string?))
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(cons ref result))
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(((? package?) (? string?))
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(cons ref result))
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(((? origin?) (? string?))
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(cons ref result))
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((? gexp? exp)
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(append (gexp-inputs exp) result))
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(((? string? file))
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(if (direct-store-path? file)
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(cons ref result)
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result))
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((refs ...)
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(fold-right add-reference-inputs result refs))
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(_
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;; Ignore references to other kinds of objects.
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result)))
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(fold-right add-reference-inputs
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'()
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(gexp-references exp)))
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(define (gexp-outputs exp)
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"Return the outputs referred to by EXP as a list of strings."
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(define (add-reference-output ref result)
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(match ref
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(($ <output-ref> name)
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(cons name result))
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((? gexp? exp)
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(append (gexp-outputs exp) result))
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(_
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result)))
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(fold-right add-reference-output
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'()
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(gexp-references exp)))
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(define* (gexp->sexp exp)
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"Return (monadically) the sexp corresponding to EXP for the given OUTPUT,
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and in the current monad setting (system type, etc.)"
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(define (reference->sexp ref)
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(with-monad %store-monad
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(match ref
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(((? derivation? drv) (? string? output))
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(return (derivation->output-path drv output)))
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(((? package? p) (? string? output))
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(package-file p #:output output))
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(((? origin? o) (? string? output))
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(mlet %store-monad ((drv (origin->derivation o)))
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(return (derivation->output-path drv output))))
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(($ <output-ref> output)
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;; Output file names are not known in advance but the daemon defines
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;; an environment variable for each of them at build time, so use
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;; that trick.
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(return `((@ (guile) getenv) ,output)))
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((? gexp? exp)
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(gexp->sexp exp))
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(((? string? str))
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(return (if (direct-store-path? str) str ref)))
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((refs ...)
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(sequence %store-monad (map reference->sexp refs)))
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(x
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(return x)))))
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(mlet %store-monad
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((args (sequence %store-monad
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(map reference->sexp (gexp-references exp)))))
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(return (apply (gexp-proc exp) args))))
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(define (canonicalize-reference ref)
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"Return a canonical variant of REF, which adds any missing output part in
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package/derivation references."
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(match ref
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((? package? p)
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`(,p "out"))
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((? origin? o)
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`(,o "out"))
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((? derivation? d)
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`(,d "out"))
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(((? package?) (? string?))
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ref)
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(((? origin?) (? string?))
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ref)
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(((? derivation?) (? string?))
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ref)
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((? string? s)
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(if (direct-store-path? s) `(,s) s))
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((refs ...)
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(map canonicalize-reference refs))
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(x x)))
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(define (syntax-location-string s)
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"Return a string representing the source code location of S."
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(let ((props (syntax-source s)))
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(if props
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(let ((file (assoc-ref props 'filename))
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(line (and=> (assoc-ref props 'line) 1+))
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(column (assoc-ref props 'column)))
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(if file
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(simple-format #f "~a:~a:~a"
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file line column)
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(simple-format #f "~a:~a" line column)))
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"<unknown location>")))
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(define-syntax gexp
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(lambda (s)
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(define (collect-escapes exp)
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;; Return all the 'ungexp' present in EXP.
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(let loop ((exp exp)
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(result '()))
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(syntax-case exp (ungexp ungexp-splicing)
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((ungexp _)
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(cons exp result))
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((ungexp _ _)
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(cons exp result))
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((ungexp-splicing _ ...)
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(cons exp result))
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((exp0 exp ...)
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(let ((result (loop #'exp0 result)))
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(fold loop result #'(exp ...))))
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(_
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result))))
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(define (escape->ref exp)
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;; Turn 'ungexp' form EXP into a "reference".
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(syntax-case exp (ungexp ungexp-splicing output)
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((ungexp output)
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#'(output-ref "out"))
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((ungexp output name)
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#'(output-ref name))
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((ungexp thing)
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#'thing)
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((ungexp drv-or-pkg out)
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#'(list drv-or-pkg out))
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((ungexp-splicing lst)
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#'lst)))
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(define (substitute-references exp substs)
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;; Return a variant of EXP where all the cars of SUBSTS have been
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;; replaced by the corresponding cdr.
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(syntax-case exp (ungexp ungexp-splicing)
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((ungexp _ ...)
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(match (assoc exp substs)
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((_ id)
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id)
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(_
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#'(syntax-error "error: no 'ungexp' substitution"
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#'ref))))
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(((ungexp-splicing _ ...) rest ...)
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(syntax-case exp ()
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((exp rest ...)
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(match (assoc #'exp substs)
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((_ id)
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(with-syntax ((id id))
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#`(append id
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#,(substitute-references #'(rest ...) substs))))
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(_
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#'(syntax-error "error: no 'ungexp-splicing' substitution"
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#'ref))))))
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((exp0 exp ...)
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#`(cons #,(substitute-references #'exp0 substs)
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#,(substitute-references #'(exp ...) substs)))
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(x #''x)))
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(syntax-case s (ungexp output)
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((_ exp)
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(let* ((escapes (delete-duplicates (collect-escapes #'exp)))
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(formals (generate-temporaries escapes))
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(sexp (substitute-references #'exp (zip escapes formals)))
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(refs (map escape->ref escapes)))
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#`(make-gexp (map canonicalize-reference (list #,@refs))
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(lambda #,formals
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#,sexp)))))))
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;;;
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;;; Convenience procedures.
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;;;
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(define (default-guile)
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;; Lazily resolve 'guile-final'. This module must not refer to (gnu …)
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;; modules directly, to avoid circular dependencies, hence this hack.
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(module-ref (resolve-interface '(gnu packages base))
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'guile-final))
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(define* (gexp->script name exp
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#:key (modules '()) (guile (default-guile)))
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"Return an executable script NAME that runs EXP using GUILE with MODULES in
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its search path."
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(mlet %store-monad ((modules (imported-modules modules))
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(compiled (compiled-modules modules)))
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(gexp->derivation name
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(gexp
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(call-with-output-file (ungexp output)
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(lambda (port)
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;; Note: that makes a long shebang. When the store
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;; is /gnu/store, that fits within the 128-byte
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;; limit imposed by Linux, but that may go beyond
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;; when running tests.
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(format port
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"#!~a/bin/guile --no-auto-compile~%!#~%"
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(ungexp guile))
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(write
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'(set! %load-path
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(cons (ungexp modules) %load-path))
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port)
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(write
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'(set! %load-compiled-path
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(cons (ungexp compiled)
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%load-compiled-path))
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port)
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(write '(ungexp exp) port)
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(chmod port #o555)))))))
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(define (gexp->file name exp)
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"Return a derivation that builds a file NAME containing EXP."
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(gexp->derivation name
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(gexp
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(call-with-output-file (ungexp output)
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(lambda (port)
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(write '(ungexp exp) port))))
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#:local-build? #t))
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;;;
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;;; Syntactic sugar.
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;;;
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(eval-when (expand load eval)
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(define (read-ungexp chr port)
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"Read an 'ungexp' or 'ungexp-splicing' form from PORT."
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(define unquote-symbol
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(match (peek-char port)
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(#\@
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(read-char port)
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'ungexp-splicing)
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(_
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'ungexp)))
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(match (read port)
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((? symbol? symbol)
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(let ((str (symbol->string symbol)))
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(match (string-index-right str #\:)
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(#f
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`(,unquote-symbol ,symbol))
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(colon
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(let ((name (string->symbol (substring str 0 colon)))
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(output (substring str (+ colon 1))))
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`(,unquote-symbol ,name ,output))))))
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(x
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`(,unquote-symbol ,x))))
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(define (read-gexp chr port)
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"Read a 'gexp' form from PORT."
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`(gexp ,(read port)))
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;; Extend the reader
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(read-hash-extend #\~ read-gexp)
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(read-hash-extend #\$ read-ungexp))
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;;; gexp.scm ends here
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