575 lines
22 KiB
Scheme
575 lines
22 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 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 inferior)
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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 ((guix utils)
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#:select (%current-system
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source-properties->location
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call-with-temporary-directory
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version>? version-prefix?
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cache-directory))
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#:use-module ((guix store)
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#:select (nix-server-socket
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nix-server-major-version
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nix-server-minor-version
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store-lift))
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#:use-module ((guix derivations)
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#:select (read-derivation-from-file))
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#:use-module (guix gexp)
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#:use-module (guix search-paths)
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#:use-module (guix profiles)
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#:use-module (guix channels)
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#:use-module (guix monads)
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#:use-module (guix store)
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#:use-module (guix derivations)
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#:use-module (guix base32)
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#:use-module (gcrypt hash)
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#:autoload (guix cache) (maybe-remove-expired-cache-entries)
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#:autoload (guix ui) (show-what-to-build*)
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#:autoload (guix build utils) (mkdir-p)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-26)
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#:autoload (ice-9 ftw) (scandir)
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#:use-module (ice-9 match)
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#:use-module (ice-9 popen)
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#:use-module (ice-9 vlist)
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#:use-module (ice-9 binary-ports)
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#:use-module ((rnrs bytevectors) #:select (string->utf8))
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#:export (inferior?
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open-inferior
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close-inferior
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inferior-eval
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inferior-eval-with-store
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inferior-object?
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inferior-packages
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lookup-inferior-packages
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inferior-package?
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inferior-package-name
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inferior-package-version
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inferior-package-synopsis
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inferior-package-description
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inferior-package-home-page
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inferior-package-location
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inferior-package-inputs
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inferior-package-native-inputs
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inferior-package-propagated-inputs
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inferior-package-transitive-propagated-inputs
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inferior-package-native-search-paths
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inferior-package-transitive-native-search-paths
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inferior-package-search-paths
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inferior-package-derivation
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inferior-package->manifest-entry
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%inferior-cache-directory
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inferior-for-channels))
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;;; Commentary:
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;;;
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;;; This module provides a way to spawn Guix "inferior" processes and to talk
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;;; to them. It allows us, from one instance of Guix, to interact with
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;;; another instance of Guix coming from a different commit.
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;;;
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;;; Code:
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;; Inferior Guix process.
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(define-record-type <inferior>
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(inferior pid socket version packages table)
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inferior?
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(pid inferior-pid)
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(socket inferior-socket)
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(version inferior-version) ;REPL protocol version
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(packages inferior-package-promise) ;promise of inferior packages
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(table inferior-package-table)) ;promise of vhash
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(define (inferior-pipe directory command)
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"Return an input/output pipe on the Guix instance in DIRECTORY. This runs
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'DIRECTORY/COMMAND repl' if it exists, or falls back to some other method if
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it's an old Guix."
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(let ((pipe (with-error-to-port (%make-void-port "w")
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(lambda ()
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(open-pipe* OPEN_BOTH
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(string-append directory "/" command)
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"repl" "-t" "machine")))))
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(if (eof-object? (peek-char pipe))
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(begin
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(close-pipe pipe)
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;; Older versions of Guix didn't have a 'guix repl' command, so
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;; emulate it.
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(open-pipe* OPEN_BOTH "guile"
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"-L" (string-append directory "/share/guile/site/"
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(effective-version))
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"-C" (string-append directory "/share/guile/site/"
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(effective-version))
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"-C" (string-append directory "/lib/guile/"
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(effective-version) "/site-ccache")
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"-c"
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(object->string
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`(begin
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(primitive-load ,(search-path %load-path
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"guix/scripts/repl.scm"))
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((@ (guix scripts repl) machine-repl))))))
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pipe)))
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(define* (open-inferior directory #:key (command "bin/guix"))
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"Open the inferior Guix in DIRECTORY, running 'DIRECTORY/COMMAND repl' or
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equivalent. Return #f if the inferior could not be launched."
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(define pipe
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(inferior-pipe directory command))
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(cond-expand
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((and guile-2 (not guile-2.2)) #t)
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(else (setvbuf pipe 'line)))
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(match (read pipe)
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(('repl-version 0 rest ...)
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(letrec ((result (inferior 'pipe pipe (cons 0 rest)
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(delay (%inferior-packages result))
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(delay (%inferior-package-table result)))))
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(inferior-eval '(use-modules (guix)) result)
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(inferior-eval '(use-modules (gnu)) result)
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(inferior-eval '(use-modules (ice-9 match)) result)
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(inferior-eval '(define %package-table (make-hash-table))
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result)
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result))
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(_
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#f)))
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(define (close-inferior inferior)
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"Close INFERIOR."
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(close-pipe (inferior-socket inferior)))
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;; Non-self-quoting object of the inferior.
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(define-record-type <inferior-object>
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(inferior-object address appearance)
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inferior-object?
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(address inferior-object-address)
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(appearance inferior-object-appearance))
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(define (write-inferior-object object port)
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(match object
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(($ <inferior-object> _ appearance)
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(format port "#<inferior-object ~a>" appearance))))
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(set-record-type-printer! <inferior-object> write-inferior-object)
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(define (read-inferior-response inferior)
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(define sexp->object
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(match-lambda
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(('value value)
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value)
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(('non-self-quoting address string)
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(inferior-object address string))))
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(match (read (inferior-socket inferior))
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(('values objects ...)
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(apply values (map sexp->object objects)))
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(('exception key objects ...)
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(apply throw key (map sexp->object objects)))))
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(define (send-inferior-request exp inferior)
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(write exp (inferior-socket inferior))
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(newline (inferior-socket inferior)))
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(define (inferior-eval exp inferior)
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"Evaluate EXP in INFERIOR."
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(send-inferior-request exp inferior)
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(read-inferior-response inferior))
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;;;
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;;; Inferior packages.
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;;;
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(define-record-type <inferior-package>
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(inferior-package inferior name version id)
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inferior-package?
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(inferior inferior-package-inferior)
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(name inferior-package-name)
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(version inferior-package-version)
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(id inferior-package-id))
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(define (write-inferior-package package port)
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(match package
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(($ <inferior-package> _ name version)
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(format port "#<inferior-package ~a@~a ~a>"
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name version
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(number->string (object-address package) 16)))))
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(set-record-type-printer! <inferior-package> write-inferior-package)
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(define (%inferior-packages inferior)
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"Compute the list of inferior packages from INFERIOR."
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(let ((result (inferior-eval
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'(fold-packages (lambda (package result)
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(let ((id (object-address package)))
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(hashv-set! %package-table id package)
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(cons (list (package-name package)
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(package-version package)
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id)
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result)))
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'())
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inferior)))
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(map (match-lambda
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((name version id)
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(inferior-package inferior name version id)))
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result)))
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(define (inferior-packages inferior)
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"Return the list of packages known to INFERIOR."
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(force (inferior-package-promise inferior)))
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(define (%inferior-package-table inferior)
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"Compute a package lookup table for INFERIOR."
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(fold (lambda (package table)
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(vhash-cons (inferior-package-name package) package
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table))
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vlist-null
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(inferior-packages inferior)))
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(define* (lookup-inferior-packages inferior name #:optional version)
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"Return the sorted list of inferior packages matching NAME in INFERIOR, with
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highest version numbers first. If VERSION is true, return only packages with
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a version number prefixed by VERSION."
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;; This is the counterpart of 'find-packages-by-name'.
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(sort (filter (lambda (package)
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(or (not version)
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(version-prefix? version
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(inferior-package-version package))))
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(vhash-fold* cons '() name
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(force (inferior-package-table inferior))))
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(lambda (p1 p2)
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(version>? (inferior-package-version p1)
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(inferior-package-version p2)))))
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(define (inferior-package-field package getter)
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"Return the field of PACKAGE, an inferior package, accessed with GETTER."
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(let ((inferior (inferior-package-inferior package))
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(id (inferior-package-id package)))
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(inferior-eval `(,getter (hashv-ref %package-table ,id))
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inferior)))
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(define* (inferior-package-synopsis package #:key (translate? #t))
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"Return the Texinfo synopsis of PACKAGE, an inferior package. When
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TRANSLATE? is true, translate it to the current locale's language."
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(inferior-package-field package
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(if translate?
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'(compose (@ (guix ui) P_) package-synopsis)
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'package-synopsis)))
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(define* (inferior-package-description package #:key (translate? #t))
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"Return the Texinfo description of PACKAGE, an inferior package. When
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TRANSLATE? is true, translate it to the current locale's language."
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(inferior-package-field package
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(if translate?
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'(compose (@ (guix ui) P_) package-description)
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'package-description)))
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(define (inferior-package-home-page package)
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"Return the home page of PACKAGE."
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(inferior-package-field package 'package-home-page))
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(define (inferior-package-location package)
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"Return the source code location of PACKAGE, either #f or a <location>
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record."
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(source-properties->location
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(inferior-package-field package
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'(compose (lambda (loc)
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(and loc
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(location->source-properties
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loc)))
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package-location))))
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(define (inferior-package-input-field package field)
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"Return the input field FIELD (e.g., 'native-inputs') of PACKAGE, an
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inferior package."
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(define field*
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`(compose (lambda (inputs)
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(map (match-lambda
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;; XXX: Origins are not handled.
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((label (? package? package) rest ...)
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(let ((id (object-address package)))
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(hashv-set! %package-table id package)
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`(,label (package ,id
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,(package-name package)
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,(package-version package))
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,@rest)))
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(x
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x))
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inputs))
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,field))
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(define inputs
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(inferior-package-field package field*))
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(define inferior
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(inferior-package-inferior package))
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(map (match-lambda
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((label ('package id name version) . rest)
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;; XXX: eq?-ness of inferior packages is not preserved here.
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`(,label ,(inferior-package inferior name version id)
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,@rest))
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(x x))
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inputs))
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(define inferior-package-inputs
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(cut inferior-package-input-field <> 'package-inputs))
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(define inferior-package-native-inputs
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(cut inferior-package-input-field <> 'package-native-inputs))
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(define inferior-package-propagated-inputs
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(cut inferior-package-input-field <> 'package-propagated-inputs))
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(define inferior-package-transitive-propagated-inputs
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(cut inferior-package-input-field <> 'package-transitive-propagated-inputs))
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(define (%inferior-package-search-paths package field)
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"Return the list of search path specificiations of PACKAGE, an inferior
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package."
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(define paths
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(inferior-package-field package
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`(compose (lambda (paths)
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(map (@ (guix search-paths)
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search-path-specification->sexp)
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paths))
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,field)))
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(map sexp->search-path-specification paths))
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(define inferior-package-native-search-paths
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(cut %inferior-package-search-paths <> 'package-native-search-paths))
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(define inferior-package-search-paths
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(cut %inferior-package-search-paths <> 'package-search-paths))
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(define inferior-package-transitive-native-search-paths
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(cut %inferior-package-search-paths <> 'package-transitive-native-search-paths))
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(define (proxy client backend) ;adapted from (guix ssh)
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"Proxy communication between CLIENT and BACKEND until CLIENT closes the
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connection, at which point CLIENT is closed (both CLIENT and BACKEND must be
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input/output ports.)"
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(define (select* read write except)
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;; This is a workaround for <https://bugs.gnu.org/30365> in Guile < 2.2.4:
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;; since 'select' sometimes returns non-empty sets for no good reason,
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;; call 'select' a second time with a zero timeout to filter out incorrect
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;; replies.
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(match (select read write except)
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((read write except)
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(select read write except 0))))
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;; Use buffered ports so that 'get-bytevector-some' returns up to the
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;; whole buffer like read(2) would--see <https://bugs.gnu.org/30066>.
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(setvbuf client _IOFBF 65536)
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(setvbuf backend _IOFBF 65536)
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(let loop ()
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(match (select* (list client backend) '() '())
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((reads () ())
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(when (memq client reads)
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(match (get-bytevector-some client)
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((? eof-object?)
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(close-port client))
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(bv
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(put-bytevector backend bv)
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(force-output backend))))
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(when (memq backend reads)
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(match (get-bytevector-some backend)
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(bv
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(put-bytevector client bv)
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(force-output client))))
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(unless (port-closed? client)
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(loop))))))
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(define (inferior-eval-with-store inferior store code)
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"Evaluate CODE in INFERIOR, passing it STORE as its argument. CODE must
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thus be the code of a one-argument procedure that accepts a store."
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;; Create a named socket in /tmp and let INFERIOR connect to it and use it
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;; as its store. This ensures the inferior uses the same store, with the
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;; same options, the same per-session GC roots, etc.
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(call-with-temporary-directory
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(lambda (directory)
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(chmod directory #o700)
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(let* ((name (string-append directory "/inferior"))
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(socket (socket AF_UNIX SOCK_STREAM 0))
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(major (nix-server-major-version store))
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(minor (nix-server-minor-version store))
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(proto (logior major minor)))
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(bind socket AF_UNIX name)
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(listen socket 1024)
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(send-inferior-request
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`(let ((proc ,code)
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(socket (socket AF_UNIX SOCK_STREAM 0)))
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(connect socket AF_UNIX ,name)
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;; 'port->connection' appeared in June 2018 and we can hardly
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;; emulate it on older versions. Thus fall back to
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;; 'open-connection', at the risk of talking to the wrong daemon or
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;; having our build result reclaimed (XXX).
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(let ((store (if (defined? 'port->connection)
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(port->connection socket #:version ,proto)
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(open-connection))))
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(dynamic-wind
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(const #t)
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(lambda ()
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(proc store))
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(lambda ()
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(close-connection store)
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(close-port socket)))))
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inferior)
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(match (accept socket)
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((client . address)
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(proxy client (nix-server-socket store))))
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(close-port socket)
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(read-inferior-response inferior)))))
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(define* (inferior-package-derivation store package
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#:optional
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(system (%current-system))
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#:key target)
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"Return the derivation for PACKAGE, an inferior package, built for SYSTEM
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and cross-built for TARGET if TARGET is true. The inferior corresponding to
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PACKAGE must be live."
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(define proc
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`(lambda (store)
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(let* ((package (hashv-ref %package-table
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,(inferior-package-id package)))
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(drv ,(if target
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`(package-cross-derivation store package
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,target
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,system)
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`(package-derivation store package
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,system))))
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(derivation-file-name drv))))
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(and=> (inferior-eval-with-store (inferior-package-inferior package) store
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proc)
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read-derivation-from-file))
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(define inferior-package->derivation
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(store-lift inferior-package-derivation))
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(define-gexp-compiler (package-compiler (package <inferior-package>) system
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target)
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;; Compile PACKAGE for SYSTEM, optionally cross-building for TARGET.
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(inferior-package->derivation package system #:target target))
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;;;
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;;; Manifest entries.
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;;;
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(define* (inferior-package->manifest-entry package
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#:optional (output "out")
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#:key (parent (delay #f))
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(properties '()))
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"Return a manifest entry for the OUTPUT of package PACKAGE."
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;; For each dependency, keep a promise pointing to its "parent" entry.
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(letrec* ((deps (map (match-lambda
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((label package)
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(inferior-package->manifest-entry package
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#:parent (delay entry)))
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((label package output)
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(inferior-package->manifest-entry package output
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#:parent (delay entry))))
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(inferior-package-propagated-inputs package)))
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(entry (manifest-entry
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(name (inferior-package-name package))
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(version (inferior-package-version package))
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(output output)
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(item package)
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(dependencies (delete-duplicates deps))
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(search-paths
|
||
(inferior-package-transitive-native-search-paths package))
|
||
(parent parent)
|
||
(properties properties))))
|
||
entry))
|
||
|
||
|
||
;;;
|
||
;;; Cached inferiors.
|
||
;;;
|
||
|
||
(define %inferior-cache-directory
|
||
;; Directory for cached inferiors (GC roots).
|
||
(make-parameter (string-append (cache-directory #:ensure? #f)
|
||
"/inferiors")))
|
||
|
||
(define* (inferior-for-channels channels
|
||
#:key
|
||
(cache-directory (%inferior-cache-directory))
|
||
(ttl (* 3600 24 30)))
|
||
"Return an inferior for CHANNELS, a list of channels. Use the cache at
|
||
CACHE-DIRECTORY, where entries can be reclaimed after TTL seconds. This
|
||
procedure opens a new connection to the build daemon.
|
||
|
||
This is a convenience procedure that people may use in manifests passed to
|
||
'guix package -m', for instance."
|
||
(with-store store
|
||
(let ()
|
||
(define instances
|
||
(latest-channel-instances store channels))
|
||
|
||
(define key
|
||
(bytevector->base32-string
|
||
(sha256
|
||
(string->utf8
|
||
(string-concatenate (map channel-instance-commit instances))))))
|
||
|
||
(define cached
|
||
(string-append cache-directory "/" key))
|
||
|
||
(define (base32-encoded-sha256? str)
|
||
(= (string-length str) 52))
|
||
|
||
(define (cache-entries directory)
|
||
(map (lambda (file)
|
||
(string-append directory "/" file))
|
||
(scandir directory base32-encoded-sha256?)))
|
||
|
||
(define symlink*
|
||
(lift2 symlink %store-monad))
|
||
|
||
(define add-indirect-root*
|
||
(store-lift add-indirect-root))
|
||
|
||
(mkdir-p cache-directory)
|
||
(maybe-remove-expired-cache-entries cache-directory
|
||
cache-entries
|
||
#:entry-expiration
|
||
(file-expiration-time ttl))
|
||
|
||
(if (file-exists? cached)
|
||
(open-inferior cached)
|
||
(run-with-store store
|
||
(mlet %store-monad ((profile
|
||
(channel-instances->derivation instances)))
|
||
(mbegin %store-monad
|
||
(show-what-to-build* (list profile))
|
||
(built-derivations (list profile))
|
||
(symlink* (derivation->output-path profile) cached)
|
||
(add-indirect-root* cached)
|
||
(return (open-inferior cached)))))))))
|