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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2019 Konrad Hinsen <konrad.hinsen@fastmail.net>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (guix scripts time-machine)
#:use-module (guix ui)
#:use-module (guix scripts)
#:use-module (guix inferior)
#:use-module (guix channels)
#:use-module (guix store)
#:use-module ((guix scripts pull)
#:select (with-git-error-handling channel-list))
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-37)
#:export (guix-time-machine))
;;;
;;; Command-line options.
;;;
(define (show-help)
(display (G_ "Usage: guix time-machine [OPTION] -- COMMAND ARGS...
Execute COMMAND ARGS... in an older version of Guix.\n"))
(display (G_ "
-C, --channels=FILE deploy the channels defined in FILE"))
(display (G_ "
--url=URL use the Git repository at URL"))
(display (G_ "
--commit=COMMIT use the specified COMMIT"))
(display (G_ "
--branch=BRANCH use the tip of the specified BRANCH"))
(display (G_ "
-h, --help display this help and exit"))
(display (G_ "
-V, --version display version information and exit"))
(newline)
(show-bug-report-information))
(define %options
;; Specifications of the command-line options.
(list (option '(#\C "channels") #t #f
(lambda (opt name arg result)
(alist-cons 'channel-file arg result)))
(option '("url") #t #f
(lambda (opt name arg result)
(alist-cons 'repository-url arg
(alist-delete 'repository-url result))))
(option '("commit") #t #f
(lambda (opt name arg result)
(alist-cons 'ref `(commit . ,arg) result)))
(option '("branch") #t #f
(lambda (opt name arg result)
(alist-cons 'ref `(branch . ,arg) result)))
(option '(#\h "help") #f #f
(lambda args
(show-help)
(exit 0)))
(option '(#\V "version") #f #f
(lambda args
(show-version-and-exit "guix time-machine")))))
(define (parse-args args)
"Parse the list of command line arguments ARGS."
;; The '--' token is used to separate the command to run from the rest of
;; the operands.
(let-values (((args command) (break (cut string=? "--" <>) args)))
(let ((opts (parse-command-line args %options '(()) #:build-options? #f)))
(match command
(() opts)
(("--") opts)
(("--" command ...) (alist-cons 'exec command opts))))))
;;;
;;; Entry point.
;;;
(define (guix-time-machine . args)
(with-error-handling
(with-git-error-handling
(let* ((opts (parse-args args))
(channels (channel-list opts))
(command-line (assoc-ref opts 'exec)))
(when command-line
(let* ((directory (with-store store
(cached-channel-instance store channels)))
(executable (string-append directory "/bin/guix")))
(apply execl (cons* executable executable command-line))))))))
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