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authorKonrad Hinsen <konrad.hinsen@fastmail.net>2019-10-25 17:42:21 +0200
committerLudovic Courtès <ludo@gnu.org>2019-11-15 23:28:17 +0100
commitf675f8dec73d02e319e607559ed2316c299ae8c7 (patch)
treeb8188a70e7cfc211b40a3406aeefd185b129b64c /guix/scripts
parent1edcfda81ba5c20ca715473d45315662c60dd81e (diff)
Add 'guix time-machine'.
* guix/scripts/time-machine.scm: New file. * Makefile.am: (MODULES): Add it. * guix/scripts/pull.scm (channel-list): Export. * guix/inferior.scm (cached-channel-instance): New procedure. (inferior-for-channels): Use it. * doc/guix.texi (Invoking guix time-machine): New section. (Channels): Cross-reference it. Signed-off-by: Ludovic Courtès <ludo@gnu.org>
Diffstat (limited to 'guix/scripts')
-rw-r--r--guix/scripts/pull.scm1
-rw-r--r--guix/scripts/time-machine.scm102
2 files changed, 103 insertions, 0 deletions
diff --git a/guix/scripts/pull.scm b/guix/scripts/pull.scm
index 418998409a..c42794dbcb 100644
--- a/guix/scripts/pull.scm
+++ b/guix/scripts/pull.scm
@@ -56,6 +56,7 @@
#:use-module (ice-9 vlist)
#:use-module (ice-9 format)
#:export (display-profile-content
+ channel-list
guix-pull))
diff --git a/guix/scripts/time-machine.scm b/guix/scripts/time-machine.scm
new file mode 100644
index 0000000000..a6598fb0f7
--- /dev/null
+++ b/guix/scripts/time-machine.scm
@@ -0,0 +1,102 @@
+;;; 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 scripts pull) #:select (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
+ (let* ((opts (parse-args args))
+ (channels (channel-list opts))
+ (command-line (assoc-ref opts 'exec)))
+ (when command-line
+ (let* ((directory (cached-channel-instance channels))
+ (executable (string-append directory "/bin/guix")))
+ (apply execl (cons* executable executable command-line)))))))