1dca6aaafa
* guix/inferior.scm (port->inferior): Bump protocol to (0 1 1).
(&inferior-exception)[stack]: New field.
(read-repl-response): Recognize 'exception' form for protocol (0 1 1).
* tests/inferior.scm ("&inferior-exception"): Check the value returned
by 'inferior-exception-stack'.
756 lines
30 KiB
Scheme
756 lines
30 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2018, 2019, 2020 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 (srfi srfi-34)
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#:use-module (srfi srfi-35)
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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 (store-connection-socket
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store-connection-major-version
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store-connection-minor-version
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store-lift
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&store-protocol-error))
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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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file-expiration-time)
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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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port->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-exception?
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inferior-exception-arguments
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inferior-exception-inferior
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inferior-exception-stack
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read-repl-response
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inferior-packages
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inferior-available-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-provenance
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inferior-package-derivation
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inferior-package->manifest-entry
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gexp->derivation-in-inferior
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%inferior-cache-directory
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cached-channel-instance
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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 close 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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(close inferior-close-socket) ;procedure
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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 error-port)
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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 error-port
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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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(with-error-to-port error-port
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(lambda ()
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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/repl.scm"))
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((@ (guix repl) machine-repl))))))))
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pipe)))
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(define* (port->inferior pipe #:optional (close close-port))
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"Given PIPE, an input/output port, return an inferior that talks over PIPE.
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PIPE is closed with CLOSE when 'close-inferior' is called on the returned
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inferior."
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(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 close (cons 0 rest)
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(delay (%inferior-packages result))
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(delay (%inferior-package-table result)))))
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;; For protocol (0 1) and later, send the protocol version we support.
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(match rest
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((n _ ...)
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(when (>= n 1)
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(send-inferior-request '(() repl-version 0 1 1) result)))
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(_
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#t))
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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 '(use-modules (srfi srfi-34)) 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* (open-inferior directory
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#:key (command "bin/guix")
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(error-port (%make-void-port "w")))
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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 error-port))
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(port->inferior pipe close-pipe))
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(define (close-inferior inferior)
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"Close INFERIOR."
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(let ((close (inferior-close-socket inferior)))
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(close (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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;; Reified exception thrown by an inferior.
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(define-condition-type &inferior-exception &error
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inferior-exception?
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(arguments inferior-exception-arguments) ;key + arguments
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(inferior inferior-exception-inferior) ;<inferior> | #f
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(stack inferior-exception-stack)) ;list of (FILE COLUMN LINE)
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(define* (read-repl-response port #:optional inferior)
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"Read a (guix repl) response from PORT and return it as a Scheme object.
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Raise '&inferior-exception' when an exception is read from PORT."
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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 port)
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(('values objects ...)
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(apply values (map sexp->object objects)))
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(('exception ('arguments key objects ...)
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('stack frames ...))
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;; Protocol (0 1 1) and later.
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(raise (condition (&inferior-exception
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(arguments (cons key (map sexp->object objects)))
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(inferior inferior)
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(stack frames)))))
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(('exception key objects ...)
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;; Protocol (0 0).
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(raise (condition (&inferior-exception
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(arguments (cons key (map sexp->object objects)))
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(inferior inferior)
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(stack '())))))))
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(define (read-inferior-response inferior)
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(read-repl-response (inferior-socket inferior)
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inferior))
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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 (inferior-available-packages inferior)
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"Return the list of name/version pairs corresponding to the set of packages
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available in INFERIOR.
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This is faster and requires less resource-intensive than calling
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'inferior-packages'."
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(if (inferior-eval '(defined? 'fold-available-packages)
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inferior)
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(inferior-eval '(fold-available-packages
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(lambda* (name version result
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#:key supported? deprecated?
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#:allow-other-keys)
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(if (and supported? (not deprecated?))
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(acons name version result)
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result))
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'())
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inferior)
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;; As a last resort, if INFERIOR is old and lacks
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;; 'fold-available-packages', fall back to 'inferior-packages'.
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(map (lambda (package)
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(cons (inferior-package-name package)
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(inferior-package-version package)))
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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 specifications 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 (inferior-package-provenance package)
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"Return a \"provenance sexp\" for PACKAGE, an inferior package. The result
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is similar to the sexp returned by 'package-provenance' for regular packages."
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(inferior-package-field package
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'(let* ((describe
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(false-if-exception
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(resolve-interface '(guix describe))))
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(provenance
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(false-if-exception
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(module-ref describe
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'package-provenance))))
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(or provenance (const #f)))))
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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 'block 65536)
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(setvbuf backend 'block 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)
|
||
(force-output client))))
|
||
(unless (port-closed? client)
|
||
(loop))))))
|
||
|
||
(define (inferior-eval-with-store inferior store code)
|
||
"Evaluate CODE in INFERIOR, passing it STORE as its argument. CODE must
|
||
thus be the code of a one-argument procedure that accepts a store."
|
||
;; Create a named socket in /tmp and let INFERIOR connect to it and use it
|
||
;; as its store. This ensures the inferior uses the same store, with the
|
||
;; same options, the same per-session GC roots, etc.
|
||
;; FIXME: This strategy doesn't work for remote inferiors (SSH).
|
||
(call-with-temporary-directory
|
||
(lambda (directory)
|
||
(chmod directory #o700)
|
||
(let* ((name (string-append directory "/inferior"))
|
||
(socket (socket AF_UNIX SOCK_STREAM 0))
|
||
(major (store-connection-major-version store))
|
||
(minor (store-connection-minor-version store))
|
||
(proto (logior major minor)))
|
||
(bind socket AF_UNIX name)
|
||
(listen socket 1024)
|
||
(send-inferior-request
|
||
`(let ((proc ,code)
|
||
(socket (socket AF_UNIX SOCK_STREAM 0))
|
||
(error? (if (defined? 'store-protocol-error?)
|
||
store-protocol-error?
|
||
nix-protocol-error?))
|
||
(error-message (if (defined? 'store-protocol-error-message)
|
||
store-protocol-error-message
|
||
nix-protocol-error-message)))
|
||
(connect socket AF_UNIX ,name)
|
||
|
||
;; 'port->connection' appeared in June 2018 and we can hardly
|
||
;; emulate it on older versions. Thus fall back to
|
||
;; 'open-connection', at the risk of talking to the wrong daemon or
|
||
;; having our build result reclaimed (XXX).
|
||
(let ((store (if (defined? 'port->connection)
|
||
(port->connection socket #:version ,proto)
|
||
(open-connection))))
|
||
(dynamic-wind
|
||
(const #t)
|
||
(lambda ()
|
||
;; Serialize '&store-protocol-error' conditions. The
|
||
;; exception serialization mechanism that
|
||
;; 'read-repl-response' expects is unsuitable for SRFI-35
|
||
;; error conditions, hence this special case.
|
||
(guard (c ((error? c)
|
||
`(store-protocol-error ,(error-message c))))
|
||
`(result ,(proc store))))
|
||
(lambda ()
|
||
(close-connection store)
|
||
(close-port socket)))))
|
||
inferior)
|
||
(match (accept socket)
|
||
((client . address)
|
||
(proxy client (store-connection-socket store))))
|
||
(close-port socket)
|
||
|
||
(match (read-inferior-response inferior)
|
||
(('store-protocol-error message)
|
||
(raise (condition
|
||
(&store-protocol-error (message message)
|
||
(status 1)))))
|
||
(('result result)
|
||
result))))))
|
||
|
||
(define* (inferior-package-derivation store package
|
||
#:optional
|
||
(system (%current-system))
|
||
#:key target)
|
||
"Return the derivation for PACKAGE, an inferior package, built for SYSTEM
|
||
and cross-built for TARGET if TARGET is true. The inferior corresponding to
|
||
PACKAGE must be live."
|
||
(define proc
|
||
`(lambda (store)
|
||
(let* ((package (hashv-ref %package-table
|
||
,(inferior-package-id package)))
|
||
(drv ,(if target
|
||
`(package-cross-derivation store package
|
||
,target
|
||
,system)
|
||
`(package-derivation store package
|
||
,system))))
|
||
(derivation-file-name drv))))
|
||
|
||
(and=> (inferior-eval-with-store (inferior-package-inferior package) store
|
||
proc)
|
||
read-derivation-from-file))
|
||
|
||
(define inferior-package->derivation
|
||
(store-lift inferior-package-derivation))
|
||
|
||
(define-gexp-compiler (package-compiler (package <inferior-package>) system
|
||
target)
|
||
;; Compile PACKAGE for SYSTEM, optionally cross-building for TARGET.
|
||
(inferior-package->derivation package system #:target target))
|
||
|
||
(define* (gexp->derivation-in-inferior name exp guix
|
||
#:key silent-failure?
|
||
#:allow-other-keys
|
||
#:rest rest)
|
||
"Return a derivation that evaluates EXP with GUIX, an instance of Guix as
|
||
returned for example by 'channel-instances->derivation'. Other arguments are
|
||
passed as-is to 'gexp->derivation'.
|
||
|
||
When SILENT-FAILURE? is true, create an empty output directory instead of
|
||
failing when GUIX is too old and lacks the 'guix repl' command."
|
||
(define script
|
||
;; EXP wrapped with a proper (set! %load-path …) prologue.
|
||
(scheme-file "inferior-script.scm" exp))
|
||
|
||
(define trampoline
|
||
;; This is a crude way to run EXP on GUIX. TODO: use 'raw-derivation' and
|
||
;; make 'guix repl' the "builder"; this will require "opening up" the
|
||
;; mechanisms behind 'gexp->derivation', and adding '-l' to 'guix repl'.
|
||
#~(begin
|
||
(use-modules (ice-9 popen))
|
||
|
||
(let ((pipe (open-pipe* OPEN_WRITE
|
||
#+(file-append guix "/bin/guix")
|
||
"repl" "-t" "machine")))
|
||
|
||
;; XXX: EXP presumably refers to #$output but that reference is lost
|
||
;; so explicitly reference it here.
|
||
#$output
|
||
|
||
(write `(primitive-load #$script) pipe)
|
||
|
||
(unless (zero? (close-pipe pipe))
|
||
(if #$silent-failure?
|
||
(mkdir #$output)
|
||
(error "inferior failed" #+guix))))))
|
||
|
||
(define (drop-extra-keyword lst)
|
||
(let loop ((lst lst)
|
||
(result '()))
|
||
(match lst
|
||
(()
|
||
(reverse result))
|
||
((#:silent-failure? _ . rest)
|
||
(loop rest result))
|
||
((kw value . tail)
|
||
(loop tail (cons* value kw result))))))
|
||
|
||
(apply gexp->derivation name trampoline
|
||
(drop-extra-keyword rest)))
|
||
|
||
|
||
;;;
|
||
;;; Manifest entries.
|
||
;;;
|
||
|
||
(define* (inferior-package->manifest-entry package
|
||
#:optional (output "out")
|
||
#:key (parent (delay #f))
|
||
(properties '()))
|
||
"Return a manifest entry for the OUTPUT of package PACKAGE."
|
||
;; For each dependency, keep a promise pointing to its "parent" entry.
|
||
(letrec* ((deps (map (match-lambda
|
||
((label package)
|
||
(inferior-package->manifest-entry package
|
||
#:parent (delay entry)))
|
||
((label package output)
|
||
(inferior-package->manifest-entry package output
|
||
#:parent (delay entry))))
|
||
(inferior-package-propagated-inputs package)))
|
||
(entry (manifest-entry
|
||
(name (inferior-package-name package))
|
||
(version (inferior-package-version package))
|
||
(output output)
|
||
(item package)
|
||
(dependencies (delete-duplicates deps))
|
||
(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* (cached-channel-instance store
|
||
channels
|
||
#:key
|
||
(cache-directory (%inferior-cache-directory))
|
||
(ttl (* 3600 24 30)))
|
||
"Return a directory containing a guix filetree defined by CHANNELS, a list of channels.
|
||
The directory is a subdirectory of CACHE-DIRECTORY, where entries can be reclaimed after TTL seconds.
|
||
This procedure opens a new connection to the build daemon."
|
||
(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)
|
||
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 cached))))))
|
||
|
||
(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."
|
||
(define cached
|
||
(with-store store
|
||
(cached-channel-instance store
|
||
channels
|
||
#:cache-directory cache-directory
|
||
#:ttl ttl)))
|
||
(open-inferior cached))
|