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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2020 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix quirks)
+ #:use-module ((guix build utils) #:select (substitute*))
+ #:use-module (srfi srfi-9)
+ #:use-module (ice-9 rdelim)
+ #:export (%quirks
+
+ patch?
+ applicable-patch?
+ apply-patch
+
+ %patches))
+
+;;; Commentary:
+;;;
+;;; Time traveling is a challenge! Sometimes, going back to the past requires
+;;; adjusting the old source code so it can be evaluated with our modern day
+;;; Guile and against our modern Guix APIs. This file describes quirks found
+;;; in old Guix revisions, along with ways to address them or patch them.
+;;;
+;;; Code:
+
+(define (syscalls-reexports-local-variables? source)
+ "Return true if (guix build syscalls) contains the bug described at
+<https://bugs.gnu.org/36723>."
+ (catch 'system-error
+ (lambda ()
+ (define content
+ (call-with-input-file (string-append source
+ "/guix/build/syscalls.scm")
+ read-string))
+
+ ;; The faulty code would use the 're-export' macro, causing the
+ ;; 'AT_SYMLINK_NOFOLLOW' local variable to be re-exported when using
+ ;; Guile > 2.2.4.
+ (string-contains content "(re-export variable)"))
+ (lambda args
+ (if (= ENOENT (system-error-errno args))
+ #f
+ (apply throw args)))))
+
+(define (guile-2.2.4)
+ (module-ref (resolve-interface '(gnu packages guile))
+ 'guile-2.2.4))
+
+(define %quirks
+ ;; List of predicate/package pairs. This allows us to provide information
+ ;; about specific Guile versions that old Guix revisions might need to use
+ ;; just to be able to build and run the trampoline in %SELF-BUILD-FILE. See
+ ;; <https://bugs.gnu.org/37506>
+ `((,syscalls-reexports-local-variables? . ,guile-2.2.4)))
+
+
+;;;
+;;; Patches.
+;;;
+
+;; Patch to apply to a source tree.
+(define-record-type <patch>
+ (patch predicate application)
+ patch?
+ (predicate patch-predicate) ;procedure
+ (application patch-application)) ;procedure
+
+(define (applicable-patch? patch source commit)
+ "Return true if PATCH is applicable to SOURCE, a directory, which
+corresponds to the given Guix COMMIT, a SHA1 hexadecimal string."
+ ;; The predicate is passed COMMIT so that it can choose to only apply to
+ ;; ancestors.
+ ((patch-predicate patch) source commit))
+
+(define (apply-patch patch source)
+ "Apply PATCH onto SOURCE, directly modifying files beneath it."
+ ((patch-application patch) source))
+
+(define %self-build-file
+ ;; The file containing code to build Guix.
+ "build-aux/build-self.scm")
+
+(define %bug-41028-patch
+ ;; Patch for <https://bugs.gnu.org/41028>. The faulty code is the
+ ;; 'compute-guix-derivation' body, which uses 'call-with-new-thread' without
+ ;; importing (ice-9 threads). However, the 'call-with-new-thread' binding
+ ;; is no longer available in the default name space on Guile 3.0.
+ (let ()
+ (define (missing-ice-9-threads-import? source commit)
+ ;; Return true if %SELF-BUILD-FILE is missing an (ice-9 threads) import.
+ (define content
+ (call-with-input-file (string-append source "/" %self-build-file)
+ read-string))
+
+ (and (string-contains content "(call-with-new-thread")
+ (not (string-contains content "(ice-9 threads)"))))
+
+ (define (add-missing-ice-9-threads-import source)
+ ;; Add (ice-9 threads) import in the gexp of 'compute-guix-derivation'.
+ (substitute* (string-append source "/" %self-build-file)
+ (("^ +\\(use-modules \\(ice-9 match\\)\\)")
+ (object->string '(use-modules (ice-9 match) (ice-9 threads))))))
+
+ (patch missing-ice-9-threads-import? add-missing-ice-9-threads-import)))
+
+(define %patches
+ ;; Bits of past Guix revisions can become incompatible with newer Guix and
+ ;; Guile. This variable lists <patch> records for the Guix source tree that
+ ;; apply to the Guix source.
+ (list %bug-41028-patch))