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, 152 insertions, 0 deletions

diff --git a/guix/gnupg.scm b/guix/gnupg.scm
new file mode 100644
index 0000000000..ee67bea91b
--- /dev/null
+++ b/guix/gnupg.scm
@@ -0,0 +1,152 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2010, 2011, 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 gnupg)
+  #:use-module (ice-9 popen)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 regex)
+  #:use-module (ice-9 rdelim)
+  #:use-module (srfi srfi-1)
+  #:export (gnupg-verify
+            gnupg-verify*
+            gnupg-status-good-signature?
+            gnupg-status-missing-key?))
+
+;;; Commentary:
+;;;
+;;; GnuPG interface.
+;;;
+;;; Code:
+
+(define %gpg-command "gpg2")
+(define %openpgp-key-server "keys.gnupg.net")
+
+(define (gnupg-verify sig file)
+  "Verify signature SIG for FILE.  Return a status s-exp if GnuPG failed."
+
+  (define (status-line->sexp line)
+    ;; See file `doc/DETAILS' in GnuPG.
+    (define sigid-rx
+      (make-regexp
+       "^\\[GNUPG:\\] SIG_ID ([A-Za-z0-9/]+) ([[:digit:]]{4}-[[:digit:]]{2}-[[:digit:]]{2}) ([[:digit:]]+)"))
+    (define goodsig-rx
+      (make-regexp "^\\[GNUPG:\\] GOODSIG ([[:xdigit:]]+) (.+)$"))
+    (define validsig-rx
+      (make-regexp
+       "^\\[GNUPG:\\] VALIDSIG ([[:xdigit:]]+) ([[:digit:]]{4}-[[:digit:]]{2}-[[:digit:]]{2}) ([[:digit:]]+) .*$"))
+    (define expkeysig-rx                    ; good signature, but expired key
+      (make-regexp "^\\[GNUPG:\\] EXPKEYSIG ([[:xdigit:]]+) (.*)$"))
+    (define errsig-rx
+      (make-regexp
+       "^\\[GNUPG:\\] ERRSIG ([[:xdigit:]]+) ([^ ]+) ([^ ]+) ([^ ]+) ([[:digit:]]+) ([[:digit:]]+)"))
+
+    (cond ((regexp-exec sigid-rx line)
+           =>
+           (lambda (match)
+             `(signature-id ,(match:substring match 1) ; sig id
+                            ,(match:substring match 2) ; date
+                            ,(string->number           ; timestamp
+                              (match:substring match 3)))))
+          ((regexp-exec goodsig-rx line)
+           =>
+           (lambda (match)
+             `(good-signature ,(match:substring match 1)    ; key id
+                              ,(match:substring match 2)))) ; user name
+          ((regexp-exec validsig-rx line)
+           =>
+           (lambda (match)
+             `(valid-signature ,(match:substring match 1) ; fingerprint
+                               ,(match:substring match 2) ; sig creation date
+                               ,(string->number           ; timestamp
+                                 (match:substring match 3)))))
+          ((regexp-exec expkeysig-rx line)
+           =>
+           (lambda (match)
+             `(expired-key-signature ,(match:substring match 1) ; fingerprint
+                                     ,(match:substring match 2)))) ; user name
+          ((regexp-exec errsig-rx line)
+           =>
+           (lambda (match)
+             `(signature-error ,(match:substring match 1) ; key id or fingerprint
+                               ,(match:substring match 2) ; pubkey algo
+                               ,(match:substring match 3) ; hash algo
+                               ,(match:substring match 4) ; sig class
+                               ,(string->number           ; timestamp
+                                 (match:substring match 5))
+                               ,(let ((rc
+                                       (string->number ; return code
+                                        (match:substring match 6))))
+                                  (case rc
+                                    ((9) 'missing-key)
+                                    ((4) 'unknown-algorithm)
+                                    (else rc))))))
+          (else
+           `(unparsed-line ,line))))
+
+  (define (parse-status input)
+    (let loop ((line   (read-line input))
+               (result '()))
+      (if (eof-object? line)
+          (reverse result)
+          (loop (read-line input)
+                (cons (status-line->sexp line) result)))))
+
+  (let* ((pipe   (open-pipe* OPEN_READ %gpg-command "--status-fd=1"
+                             "--verify" sig file))
+         (status (parse-status pipe)))
+    ;; Ignore PIPE's exit status since STATUS above should contain all the
+    ;; info we need.
+    (close-pipe pipe)
+    status))
+
+(define (gnupg-status-good-signature? status)
+  "If STATUS, as returned by `gnupg-verify', denotes a good signature, return
+a key-id/user pair; return #f otherwise."
+  (any (lambda (sexp)
+         (match sexp
+           (((or 'good-signature 'expired-key-signature) key-id user)
+            (cons key-id user))
+           (_ #f)))
+       status))
+
+(define (gnupg-status-missing-key? status)
+  "If STATUS denotes a missing-key error, then return the key-id of the
+missing key."
+  (any (lambda (sexp)
+         (match sexp
+           (('signature-error key-id _ ...)
+            key-id)
+           (_ #f)))
+       status))
+
+(define (gnupg-receive-keys key-id server)
+  (system* %gpg-command "--keyserver" server "--recv-keys" key-id))
+
+(define* (gnupg-verify* sig file #:optional (server %openpgp-key-server))
+  "Like `gnupg-verify', but try downloading the public key if it's missing.
+Return #t if the signature was good, #f otherwise."
+  (let ((status (gnupg-verify sig file)))
+    (or (gnupg-status-good-signature? status)
+        (let ((missing (gnupg-status-missing-key? status)))
+          (and missing
+               (begin
+                 ;; Download the missing key and try again.
+                 (gnupg-receive-keys missing server)
+                 (gnupg-status-good-signature? (gnupg-verify sig file))))))))
+
+;;; gnupg.scm ends here