1 ;;; GNU Guix --- Functional package management for GNU
2 ;;; Copyright © 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
4 ;;; This file is part of GNU Guix.
6 ;;; GNU Guix is free software; you can redistribute it and/or modify it
7 ;;; under the terms of the GNU General Public License as published by
8 ;;; the Free Software Foundation; either version 3 of the License, or (at
9 ;;; your option) any later version.
11 ;;; GNU Guix is distributed in the hope that it will be useful, but
12 ;;; WITHOUT ANY WARRANTY; without even the implied warranty of
13 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 ;;; GNU General Public License for more details.
16 ;;; You should have received a copy of the GNU General Public License
17 ;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
19 (define-module (guix grafts)
20 #:use-module (guix store)
21 #:use-module (guix monads)
22 #:use-module (guix records)
23 #:use-module (guix combinators)
24 #:use-module (guix derivations)
25 #:use-module ((guix utils) #:select (%current-system))
26 #:use-module (guix sets)
27 #:use-module (srfi srfi-1)
28 #:use-module (srfi srfi-9 gnu)
29 #:use-module (srfi srfi-26)
30 #:use-module (srfi srfi-34)
31 #:use-module (srfi srfi-71)
32 #:use-module (ice-9 match)
33 #:use-module (ice-9 vlist)
39 graft-replacement-output
42 graft-derivation/shallow
48 (define-record-type* <graft> graft make-graft
50 (origin graft-origin) ;derivation | store item
51 (origin-output graft-origin-output ;string | #f
53 (replacement graft-replacement) ;derivation | store item
54 (replacement-output graft-replacement-output ;string | #f
57 (define (write-graft graft port)
58 "Write a concise representation of GRAFT to PORT."
59 (define (->string thing output)
60 (if (derivation? thing)
61 (derivation->output-path thing output)
65 (($ <graft> origin origin-output replacement replacement-output)
66 (format port "#<graft ~a ==> ~a ~a>"
67 (->string origin origin-output)
68 (->string replacement replacement-output)
69 (number->string (object-address graft) 16)))))
71 (set-record-type-printer! <graft> write-graft)
73 (define (graft-origin-file-name graft)
74 "Return the output file name of the origin of GRAFT."
76 (($ <graft> (? derivation? origin) output)
77 (derivation->output-path origin output))
78 (($ <graft> (? string? item))
81 (define* (graft-derivation/shallow store drv grafts
83 (name (derivation-name drv))
84 (outputs (derivation-output-names drv))
85 (guile (%guile-for-build))
86 (system (%current-system)))
87 "Return a derivation called NAME, which applies GRAFTS to the specified
88 OUTPUTS of DRV. This procedure performs \"shallow\" grafting in that GRAFTS
89 are not recursively applied to dependencies of DRV."
90 ;; XXX: Someday rewrite using gexps.
92 ;; List of store item pairs.
94 (($ <graft> source source-output target target-output)
95 (cons (if (derivation? source)
96 (derivation->output-path source source-output)
98 (if (derivation? target)
99 (derivation->output-path target target-output)
104 (map (lambda (output)
106 (derivation-output-path
107 (assoc-ref (derivation-outputs drv) output))))
112 (use-modules (guix build graft)
116 (let* ((old-outputs ',output-pairs)
117 (mapping (append ',mapping
120 (cons (assoc-ref old-outputs name)
123 (graft old-outputs %outputs mapping))))
130 (graft (count . ,(length grafts)))))
133 ((($ <graft> sources source-outputs targets target-outputs) ...)
134 (let ((sources (zip sources source-outputs))
135 (targets (zip targets target-outputs)))
136 (build-expression->derivation store name build
138 #:guile-for-build guile
139 #:modules '((guix build graft)
141 (guix build debug-link)
143 #:inputs `(,@(map (lambda (out)
146 ,@(append (map add-label sources)
147 (map add-label targets)))
150 ;; Grafts are computationally cheap so no
151 ;; need to offload or substitute.
155 #:properties properties)))))
157 (define (non-self-references store drv outputs)
158 "Return the list of references of the OUTPUTS of DRV, excluding self
160 (define (references* items)
161 ;; Return the references of ITEMS.
162 (guard (c ((store-protocol-error? c)
163 ;; ITEMS are not in store so build INPUT first.
164 (and (build-derivations store (list drv))
165 (append-map (cut references/cached store <>) items))))
166 (append-map (cut references/cached store <>) items)))
168 (let ((refs (references* (map (cut derivation->output-path drv <>)
170 (self (match (derivation->output-paths drv)
171 (((names . items) ...)
173 (remove (cut member <> self) refs)))
176 ;; Cache that maps derivation/outputs/grafts tuples to lists of grafts.
177 (allocate-store-connection-cache 'grafts))
179 (define record-cache-lookup!
180 (cache-lookup-recorder "derivation-graft-cache"
181 "Derivation graft cache"))
183 (define-syntax-rule (with-cache key exp ...)
184 "Cache the value of monadic expression EXP under KEY."
185 (mlet* %state-monad ((cache (current-state))
186 (result -> (vhash-assoc key cache)))
187 (record-cache-lookup! result cache)
189 ((_ . result) ;cache hit
192 (mlet %state-monad ((result (begin exp ...))
193 (cache (current-state)))
195 (set-current-state (vhash-cons key result cache))
196 (return result)))))))
198 (define (reference-origins drv items)
199 "Return the derivation/output pairs among the inputs of DRV, recursively,
200 that produce ITEMS. Elements of ITEMS not produced by a derivation (i.e.,
201 it's a content-addressed \"source\"), or not produced by a dependency of DRV,
202 have no corresponding element in the resulting list."
203 (define (lookup-derivers drv result items)
204 ;; Return RESULT augmented by all the drv/output pairs producing one of
205 ;; ITEMS, and ITEMS stripped of matching items.
206 (fold2 (match-lambda*
207 (((output . file) result items)
208 (if (member file items)
209 (values (alist-cons drv output result)
211 (values result items))))
213 (derivation->output-paths drv)))
215 ;; Perform a breadth-first traversal of the dependency graph of DRV in
216 ;; search of the derivations that produce ITEMS.
217 (let loop ((drv (list drv))
227 ((set-contains? visited drv)
228 (loop rest items result visited))
231 (map derivation-input-derivation
232 (derivation-inputs drv)))
234 (fold2 lookup-derivers
235 result items inputs)))
236 (loop (append rest inputs)
238 (set-insert drv visited)))))))))
240 (define* (cumulative-grafts store drv grafts
242 (outputs (derivation-output-names drv))
243 (guile (%guile-for-build))
244 (system (%current-system)))
245 "Augment GRAFTS with additional grafts resulting from the application of
246 GRAFTS to the dependencies of DRV. Return the resulting list of grafts.
248 This is a monadic procedure in %STATE-MONAD where the state is a vhash mapping
249 derivations to the corresponding set of grafts."
250 (define (graft-origin? drv graft)
251 ;; Return true if DRV corresponds to the origin of GRAFT.
253 (($ <graft> (? derivation? origin) output)
254 (match (assoc-ref (derivation->output-paths drv) output)
257 (derivation->output-path origin output)))
263 (define (dependency-grafts items)
268 ;; If GRAFTS already contains a graft from DRV, do not
270 (if (find (cut graft-origin? drv <>) grafts)
271 (state-return grafts)
272 (cumulative-grafts store drv grafts
273 #:outputs (list output)
276 (reference-origins drv items)))
278 (with-cache (list (derivation-file-name drv) outputs grafts)
279 (match (non-self-references store drv outputs)
282 (deps ;one or more dependencies
283 (mlet %state-monad ((grafts (dependency-grafts deps)))
284 (let ((grafts (delete-duplicates (concatenate grafts) equal?)))
285 (match (filter (lambda (graft)
286 (member (graft-origin-file-name graft) deps))
291 ;; Use APPLICABLE, the subset of GRAFTS that is really
292 ;; applicable to DRV, to avoid creating several identical
293 ;; grafted variants of DRV.
294 (let* ((new (graft-derivation/shallow store drv applicable
298 (grafts (append (map (lambda (output)
301 (origin-output output)
303 (replacement-output output)))
306 (return grafts))))))))))
308 (define* (graft-derivation store drv grafts
310 (guile (%guile-for-build))
311 (outputs (derivation-output-names drv))
312 (system (%current-system)))
313 "Apply GRAFTS to the OUTPUTS of DRV and all their dependencies, recursively.
314 That is, if GRAFTS apply only indirectly to DRV, graft the dependencies of
315 DRV, and graft DRV itself to refer to those grafted dependencies."
318 (cumulative-grafts store drv grafts
320 #:guile guile #:system system)
321 (store-connection-cache store %graft-cache))))
323 ;; Save CACHE in STORE to benefit from it on the next call.
324 ;; XXX: Ideally we'd use %STORE-MONAD and 'mcached' and avoid mutating
326 (set-store-connection-cache! store %graft-cache cache)
330 ;; If FIRST is not a graft for DRV, it means that GRAFTS are not
331 ;; applicable to DRV and nothing needs to be done.
332 (if (equal? drv (graft-origin first))
333 (graft-replacement first)
337 ;; The following might feel more at home in (guix packages) but since (guix
338 ;; gexp), which is a lower level, needs them, we put them here.
341 ;; Whether to honor package grafts by default.
344 (define-inlinable (set-grafting enable?)
345 ;; This monadic procedure enables grafting when ENABLE? is true, and
346 ;; disables it otherwise. It returns the previous setting.
348 (values (%graft? enable?) store)))
350 (define-inlinable (grafting?)
351 ;; Return a Boolean indicating whether grafting is enabled.
353 (values (%graft?) store)))
356 ;; eval: (put 'with-cache 'scheme-indent-function 1)
359 ;;; grafts.scm ends here