201 lines
7.7 KiB
Scheme
201 lines
7.7 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2019 Konrad Hinsen <konrad.hinsen@fastmail.net>
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;;; Copyright © 2019, 2020, 2021, 2023 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2021 Simon Tournier <zimon.toutoune@gmail.com>
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;;; Copyright © 2023 Maxim Cournoyer <maxim.cournoyer@gmail.com>
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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 scripts time-machine)
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#:use-module (guix channels)
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#:use-module (guix diagnostics)
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#:use-module (guix ui)
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#:use-module (guix scripts)
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#:use-module (guix inferior)
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#:use-module (guix store)
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#:use-module (guix status)
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#:use-module ((guix git)
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#:select (update-cached-checkout with-git-error-handling))
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#:use-module ((guix utils)
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#:select (%current-system))
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#:use-module ((guix scripts pull)
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#:select (channel-list))
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#:use-module ((guix scripts build)
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#:select (%standard-build-options
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show-build-options-help
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set-build-options-from-command-line))
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#:use-module (ice-9 match)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-11)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-34)
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#:use-module (srfi srfi-37)
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#:use-module (srfi srfi-71)
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#:export (guix-time-machine))
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;;;
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;;; Command-line options.
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;;;
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(define (show-help)
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(display (G_ "Usage: guix time-machine [OPTION] -- COMMAND ARGS...
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Execute COMMAND ARGS... in an older version of Guix.\n"))
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(display (G_ "
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-C, --channels=FILE deploy the channels defined in FILE"))
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(display (G_ "
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-q, --no-channel-files
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inhibit loading of user and system 'channels.scm'"))
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(display (G_ "
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--url=URL use the Git repository at URL"))
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(display (G_ "
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--commit=COMMIT use the specified COMMIT"))
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(display (G_ "
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--branch=BRANCH use the tip of the specified BRANCH"))
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(display (G_ "
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--disable-authentication
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disable channel authentication"))
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(newline)
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(show-build-options-help)
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(newline)
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(display (G_ "
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-h, --help display this help and exit"))
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(display (G_ "
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-V, --version display version information and exit"))
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(newline)
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(show-bug-report-information))
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(define %options
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;; Specifications of the command-line options.
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(cons* (option '(#\C "channels") #t #f
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(lambda (opt name arg result)
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(alist-cons 'channel-file arg result)))
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(option '(#\q "no-channel-files") #f #f
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(lambda (opt name arg result)
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(alist-cons 'ignore-channel-files? #t result)))
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(option '("url") #t #f
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(lambda (opt name arg result)
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(alist-cons 'repository-url arg
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(alist-delete 'repository-url result))))
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(option '("commit") #t #f
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(lambda (opt name arg result)
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(alist-cons 'ref `(tag-or-commit . ,arg) result)))
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(option '("branch") #t #f
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(lambda (opt name arg result)
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(alist-cons 'ref `(branch . ,arg) result)))
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(option '("disable-authentication") #f #f
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(lambda (opt name arg result)
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(alist-cons 'authenticate-channels? #f result)))
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(option '(#\h "help") #f #f
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(lambda args
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(leave-on-EPIPE (show-help))
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(exit 0)))
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(option '(#\V "version") #f #f
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(lambda args
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(show-version-and-exit "guix time-machine")))
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%standard-build-options))
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(define %default-options
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;; Alist of default option values.
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`((system . ,(%current-system))
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(substitutes? . #t)
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(offload? . #t)
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(print-build-trace? . #t)
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(print-extended-build-trace? . #t)
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(multiplexed-build-output? . #t)
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(authenticate-channels? . #t)
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(graft? . #t)
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(debug . 0)
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(verbosity . 1)))
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(define (parse-args args)
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"Parse the list of command line arguments ARGS."
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;; The '--' token is used to separate the command to run from the rest of
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;; the operands.
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(let-values (((args command) (break (cut string=? "--" <>) args)))
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(let ((opts (parse-command-line args %options
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(list %default-options))))
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(when (assoc-ref opts 'argument)
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(leave (G_ "~A: extraneous argument~%")
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(assoc-ref opts 'argument)))
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(match command
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(() opts)
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(("--") opts)
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(("--" command ...) (alist-cons 'exec command opts))))))
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;;;
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;;; Avoiding traveling too far back.
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;;;
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;;; The required inferiors mechanism relied on by 'guix time-machine' was
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;;; firmed up in v1.0.0; it is the oldest, safest commit that can be travelled
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;;; to.
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(define %oldest-possible-commit
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"6298c3ffd9654d3231a6f25390b056483e8f407c") ;v1.0.0
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(define %reference-channels
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(list (channel (inherit %default-guix-channel)
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(commit %oldest-possible-commit))))
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(define (validate-guix-channel channel start commit relation)
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"Raise an error if CHANNEL is the 'guix' channel and the RELATION of COMMIT
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to %OLDEST-POSSIBLE-COMMIT is not that of an ancestor."
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(unless (or (not (guix-channel? channel))
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(memq relation '(ancestor self)))
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(raise (formatted-message
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(G_ "cannot travel past commit `~a' from May 1st, 2019")
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(string-take %oldest-possible-commit 12)))))
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;;;
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;;; Entry point.
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;;;
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(define-command (guix-time-machine . args)
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(synopsis "run commands from a different revision")
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(with-error-handling
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(with-git-error-handling
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(let* ((opts (parse-args args))
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(channels (channel-list opts))
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(command-line (assoc-ref opts 'exec))
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(ref (assoc-ref opts 'ref))
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(substitutes? (assoc-ref opts 'substitutes?))
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(authenticate? (assoc-ref opts 'authenticate-channels?)))
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(if command-line
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(let* ((directory
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(with-store store
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(with-status-verbosity (assoc-ref opts 'verbosity)
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(with-build-handler (build-notifier #:use-substitutes?
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substitutes?
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#:verbosity
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(assoc-ref opts 'verbosity)
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#:dry-run? #f)
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(set-build-options-from-command-line store opts)
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(cached-channel-instance store channels
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#:authenticate? authenticate?
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#:reference-channels
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%reference-channels
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#:validate-channels
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validate-guix-channel)))))
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(executable (string-append directory "/bin/guix")))
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(apply execl (cons* executable executable command-line)))
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(warning (G_ "no command specified; nothing to do~%")))))))
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