103 lines
3.7 KiB
Scheme
103 lines
3.7 KiB
Scheme
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2019 Konrad Hinsen <konrad.hinsen@fastmail.net>
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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 ui)
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#:use-module (guix scripts)
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#:use-module (guix inferior)
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#:use-module (guix channels)
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#:use-module ((guix scripts pull) #:select (channel-list))
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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-37)
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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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--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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-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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(list (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 '("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 `(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 '(#\h "help") #f #f
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(lambda args
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(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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(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 '(()) #:build-options? #f)))
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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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;;; Entry point.
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;;;
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(define (guix-time-machine . args)
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(with-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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(when command-line
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(let* ((directory (cached-channel-instance channels))
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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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