352 lines
14 KiB
Scheme
352 lines
14 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2014, 2015, 2016, 2017, 2018 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 grafts)
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#:use-module (guix store)
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#:use-module (guix monads)
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#:use-module (guix records)
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#:use-module (guix derivations)
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#:use-module ((guix utils) #:select (%current-system))
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-9 gnu)
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#:use-module (srfi srfi-11)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-34)
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#:use-module (ice-9 match)
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#:use-module (ice-9 vlist)
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#:export (graft?
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graft
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graft-origin
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graft-replacement
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graft-origin-output
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graft-replacement-output
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graft-derivation
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graft-derivation/shallow
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%graft?
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set-grafting
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grafting?))
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(define-record-type* <graft> graft make-graft
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graft?
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(origin graft-origin) ;derivation | store item
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(origin-output graft-origin-output ;string | #f
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(default "out"))
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(replacement graft-replacement) ;derivation | store item
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(replacement-output graft-replacement-output ;string | #f
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(default "out")))
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(define (write-graft graft port)
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"Write a concise representation of GRAFT to PORT."
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(define (->string thing output)
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(if (derivation? thing)
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(derivation->output-path thing output)
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thing))
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(match graft
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(($ <graft> origin origin-output replacement replacement-output)
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(format port "#<graft ~a ==> ~a ~a>"
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(->string origin origin-output)
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(->string replacement replacement-output)
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(number->string (object-address graft) 16)))))
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(set-record-type-printer! <graft> write-graft)
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(define (graft-origin-file-name graft)
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"Return the output file name of the origin of GRAFT."
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(match graft
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(($ <graft> (? derivation? origin) output)
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(derivation->output-path origin output))
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(($ <graft> (? string? item))
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item)))
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(define* (graft-derivation/shallow store drv grafts
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#:key
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(name (derivation-name drv))
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(outputs (derivation-output-names drv))
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(guile (%guile-for-build))
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(system (%current-system)))
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"Return a derivation called NAME, which applies GRAFTS to the specified
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OUTPUTS of DRV. This procedure performs \"shallow\" grafting in that GRAFTS
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are not recursively applied to dependencies of DRV."
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;; XXX: Someday rewrite using gexps.
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(define mapping
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;; List of store item pairs.
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(map (match-lambda
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(($ <graft> source source-output target target-output)
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(cons (if (derivation? source)
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(derivation->output-path source source-output)
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source)
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(if (derivation? target)
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(derivation->output-path target target-output)
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target))))
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grafts))
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(define output-pairs
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(map (lambda (output)
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(cons output
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(derivation-output-path
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(assoc-ref (derivation-outputs drv) output))))
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outputs))
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(define build
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`(begin
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(use-modules (guix build graft)
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(guix build utils)
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(ice-9 match))
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(let* ((old-outputs ',output-pairs)
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(mapping (append ',mapping
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(map (match-lambda
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((name . file)
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(cons (assoc-ref old-outputs name)
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file)))
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%outputs))))
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(graft old-outputs %outputs mapping))))
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(define add-label
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(cut cons "x" <>))
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(define properties
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`((type . graft)
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(graft (count . ,(length grafts)))))
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(match grafts
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((($ <graft> sources source-outputs targets target-outputs) ...)
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(let ((sources (zip sources source-outputs))
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(targets (zip targets target-outputs)))
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(build-expression->derivation store name build
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#:system system
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#:guile-for-build guile
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#:modules '((guix build graft)
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(guix build utils)
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(guix build debug-link)
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(guix elf))
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#:inputs `(,@(map (lambda (out)
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`("x" ,drv ,out))
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outputs)
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,@(append (map add-label sources)
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(map add-label targets)))
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#:outputs outputs
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;; Grafts are computationally cheap so no
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;; need to offload or substitute.
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#:local-build? #t
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#:substitutable? #f
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#:properties properties)))))
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(define (item->deriver store item)
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"Return two values: the derivation that led to ITEM (a store item), and the
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name of the output of that derivation ITEM corresponds to (for example
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\"out\"). When ITEM has no deriver, for instance because it is a plain file,
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#f and #f are returned."
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(match (valid-derivers store item)
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(() ;ITEM is a plain file
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(values #f #f))
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((drv-file _ ...)
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(let ((drv (read-derivation-from-file drv-file)))
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(values drv
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(any (match-lambda
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((name . path)
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(and (string=? item path) name)))
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(derivation->output-paths drv)))))))
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(define (non-self-references references drv outputs)
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"Return the list of references of the OUTPUTS of DRV, excluding self
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references. Call REFERENCES to get the list of references."
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(let ((refs (append-map (compose references
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(cut derivation->output-path drv <>))
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outputs))
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(self (match (derivation->output-paths drv)
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(((names . items) ...)
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items))))
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(remove (cut member <> self) refs)))
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(define (references-oracle store drv)
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"Return a one-argument procedure that, when passed the file name of DRV's
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outputs or their dependencies, returns the list of references of that item.
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Use either local info or substitute info; build DRV if no information is
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available."
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(define (output-paths drv)
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(match (derivation->output-paths drv)
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(((names . items) ...)
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items)))
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(define (references* items)
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(guard (c ((nix-protocol-error? c)
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;; As a last resort, build DRV and query the references of the
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;; build result.
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;; Warm up the narinfo cache, otherwise each derivation build
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;; will result in one HTTP request to get one narinfo, which is
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;; much less efficient than fetching them all upfront.
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(substitution-oracle store (list drv))
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(and (build-derivations store (list drv))
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(map (cut references store <>) items))))
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(references/substitutes store items)))
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(let loop ((items (output-paths drv))
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(result vlist-null))
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(match items
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(()
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(lambda (item)
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(match (vhash-assoc item result)
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((_ . refs) refs)
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(#f #f))))
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(_
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(let* ((refs (references* items))
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(result (fold vhash-cons result items refs)))
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(loop (remove (cut vhash-assoc <> result)
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(delete-duplicates (concatenate refs) string=?))
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result))))))
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(define-syntax-rule (with-cache key exp ...)
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"Cache the value of monadic expression EXP under KEY."
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(mlet %state-monad ((cache (current-state)))
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(match (vhash-assoc key cache)
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((_ . result) ;cache hit
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(return result))
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(#f ;cache miss
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(mlet %state-monad ((result (begin exp ...))
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(cache (current-state)))
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(mbegin %state-monad
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(set-current-state (vhash-cons key result cache))
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(return result)))))))
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(define* (cumulative-grafts store drv grafts
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references
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#:key
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(outputs (derivation-output-names drv))
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(guile (%guile-for-build))
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(system (%current-system)))
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"Augment GRAFTS with additional grafts resulting from the application of
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GRAFTS to the dependencies of DRV; REFERENCES must be a one-argument procedure
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that returns the list of references of the store item it is given. Return the
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resulting list of grafts.
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This is a monadic procedure in %STATE-MONAD where the state is a vhash mapping
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derivations to the corresponding set of grafts."
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(define (graft-origin? drv graft)
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;; Return true if DRV corresponds to the origin of GRAFT.
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(match graft
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(($ <graft> (? derivation? origin) output)
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(match (assoc-ref (derivation->output-paths drv) output)
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((? string? result)
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(string=? result
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(derivation->output-path origin output)))
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(_
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#f)))
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(_
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#f)))
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(define (dependency-grafts item)
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(let-values (((drv output) (item->deriver store item)))
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(if drv
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;; If GRAFTS already contains a graft from DRV, do not override it.
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(if (find (cut graft-origin? drv <>) grafts)
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(state-return grafts)
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(cumulative-grafts store drv grafts references
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#:outputs (list output)
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#:guile guile
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#:system system))
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(state-return grafts))))
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(with-cache (cons (derivation-file-name drv) outputs)
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(match (non-self-references references drv outputs)
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(() ;no dependencies
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(return grafts))
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(deps ;one or more dependencies
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(mlet %state-monad ((grafts (mapm %state-monad dependency-grafts deps)))
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(let ((grafts (delete-duplicates (concatenate grafts) equal?)))
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(match (filter (lambda (graft)
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(member (graft-origin-file-name graft) deps))
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grafts)
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(()
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(return grafts))
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((applicable ..1)
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;; Use APPLICABLE, the subset of GRAFTS that is really
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;; applicable to DRV, to avoid creating several identical
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;; grafted variants of DRV.
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(let* ((new (graft-derivation/shallow store drv applicable
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#:outputs outputs
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#:guile guile
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#:system system))
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(grafts (append (map (lambda (output)
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(graft
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(origin drv)
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(origin-output output)
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(replacement new)
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(replacement-output output)))
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outputs)
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grafts)))
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(return grafts))))))))))
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(define* (graft-derivation store drv grafts
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#:key
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(guile (%guile-for-build))
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(outputs (derivation-output-names drv))
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(system (%current-system)))
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"Apply GRAFTS to the OUTPUTS of DRV and all their dependencies, recursively.
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That is, if GRAFTS apply only indirectly to DRV, graft the dependencies of
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DRV, and graft DRV itself to refer to those grafted dependencies."
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;; First, pre-compute the dependency tree of the outputs of DRV. Do this
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;; upfront to have as much parallelism as possible when querying substitute
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;; info or when building DRV.
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(define references
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(references-oracle store drv))
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(match (run-with-state
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(cumulative-grafts store drv grafts references
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#:outputs outputs
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#:guile guile #:system system)
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vlist-null) ;the initial cache
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((first . rest)
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;; If FIRST is not a graft for DRV, it means that GRAFTS are not
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;; applicable to DRV and nothing needs to be done.
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(if (equal? drv (graft-origin first))
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(graft-replacement first)
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drv))))
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;; The following might feel more at home in (guix packages) but since (guix
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;; gexp), which is a lower level, needs them, we put them here.
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(define %graft?
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;; Whether to honor package grafts by default.
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(make-parameter #t))
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(define (set-grafting enable?)
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"This monadic procedure enables grafting when ENABLE? is true, and disables
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it otherwise. It returns the previous setting."
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(lambda (store)
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(values (%graft? enable?) store)))
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(define (grafting?)
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"Return a Boolean indicating whether grafting is enabled."
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(lambda (store)
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(values (%graft?) store)))
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;; Local Variables:
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;; eval: (put 'with-cache 'scheme-indent-function 1)
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;; End:
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;;; grafts.scm ends here
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