Add `guix refresh' and related auto-update tools.

* guix/gnu-maintenance.scm (ftp-server/directory)[quirks]: Add glib.
  (package-update-path, download-tarball, package-update,
  update-package-source): New procedures.
* guix/gnupg.scm, guix/scripts/refresh.scm: New files.
* Makefile.am (MODULES): Add them.
* guix/utils.scm (file-extension): New procedure.

1 files changed, 137 insertions, 0 deletions

diff --git a/guix/scripts/refresh.scm b/guix/scripts/refresh.scm
new file mode 100644
index 0000000000..036da38a3f
--- /dev/null
+++ b/guix/scripts/refresh.scm
@@ -0,0 +1,137 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; 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 refresh)
+  #:use-module (guix ui)
+  #:use-module (guix store)
+  #:use-module (guix utils)
+  #:use-module (guix packages)
+  #:use-module (guix gnu-maintenance)
+  #:use-module (gnu packages)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 regex)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-11)
+  #:use-module (srfi srfi-26)
+  #:use-module (srfi srfi-37)
+  #:use-module (rnrs io ports)
+  #:export (guix-refresh))
+
+
+;;;
+;;; Command-line options.
+;;;
+
+(define %default-options
+  ;; Alist of default option values.
+  '())
+
+(define %options
+  ;; Specification of the command-line options.
+  (list (option '(#\n "dry-run") #f #f
+                (lambda (opt name arg result)
+                  (alist-cons 'dry-run? #t result)))
+
+        (option '(#\h "help") #f #f
+                (lambda args
+                  (show-help)
+                  (exit 0)))
+        (option '(#\V "version") #f #f
+                (lambda args
+                  (show-version-and-exit "guix refresh")))))
+
+(define (show-help)
+  (display (_ "Usage: guix refresh [OPTION]... PACKAGE...
+Update package definitions to match the latest upstream version.\n"))
+  (display (_ "
+  -n, --dry-run          do not build the derivations"))
+  (newline)
+  (display (_ "
+  -h, --help             display this help and exit"))
+  (display (_ "
+  -V, --version          display version information and exit"))
+  (newline)
+  (show-bug-report-information))
+
+
+;;;
+;;; Entry point.
+;;;
+
+(define (guix-refresh . args)
+  (define (parse-options)
+    ;; Return the alist of option values.
+    (args-fold args %options
+               (lambda (opt name arg result)
+                 (leave (_ "~A: unrecognized option~%") name))
+               (lambda (arg result)
+                 (alist-cons 'argument arg result))
+               %default-options))
+
+  (let* ((opts     (parse-options))
+         (dry-run? (assoc-ref opts 'dry-run?))
+         (packages (match (concatenate
+                           (filter-map (match-lambda
+                                        (('argument . value)
+                                         (let ((p (find-packages-by-name value)))
+                                           (unless p
+                                             (leave (_ "~a: no package by that name")
+                                                    value))
+                                           p))
+                                        (_ #f))
+                                       opts))
+                     (()                          ; default to all packages
+                      ;; TODO: Keep only the newest of each package.
+                      (fold-packages cons '()))
+                     (some                        ; user-specified packages
+                      some))))
+   (with-error-handling
+     (if dry-run?
+         (for-each (lambda (package)
+                     (match (false-if-exception (package-update-path package))
+                       ((new-version . directory)
+                        (let ((loc (or (package-field-location package 'version)
+                                       (package-location package))))
+                          (format (current-error-port)
+                                  (_ "~a: ~a would be upgraded from ~a to ~a~%")
+                                  (location->string loc)
+                                  (package-name package) (package-version package)
+                                  new-version)))
+                       (_ #f)))
+                   packages)
+         (let ((store (open-connection)))
+           (for-each (lambda (package)
+                       (let-values (((version tarball)
+                                     (catch #t
+                                       (lambda ()
+                                         (package-update store package))
+                                       (lambda _
+                                         (values #f #f))))
+                                    ((loc)
+                                     (or (package-field-location package
+                                                                 'version)
+                                         (package-location package))))
+                         (when version
+                           (format (current-error-port)
+                                   (_ "~a: ~a: updating from version ~a to version ~a...~%")
+                                   (location->string loc) (package-name package)
+                                   (package-version package) version)
+                           (let ((hash (call-with-input-file tarball
+                                         (compose sha256 get-bytevector-all))))
+                             (update-package-source package version hash)))))
+                     packages))))))