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| | ;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2020, 2024 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 git authenticate)
#:use-module (git)
#:use-module (guix ui)
#:use-module (guix scripts)
#:use-module (guix git-authenticate)
#:autoload (guix openpgp) (openpgp-format-fingerprint
openpgp-public-key-fingerprint)
#:use-module ((guix channels) #:select (openpgp-fingerprint))
#:use-module ((guix git) #:select (with-git-error-handling))
#:use-module (guix progress)
#:use-module (guix base64)
#:autoload (rnrs bytevectors) (bytevector-length)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-37)
#:use-module (ice-9 format)
#:use-module (ice-9 match)
#:export (guix-git-authenticate))
;;; Commentary:
;;;
;;; Authenticate a Git checkout by reading '.guix-authorizations' files and
;;; following the "authorizations invariant" also used by (guix channels).
;;;
;;; Code:
(define %options
;; Specifications of the command-line options.
(list (option '(#\h "help") #f #f
(lambda args
(show-help)
(exit 0)))
(option '(#\V "version") #f #f
(lambda args
(show-version-and-exit "guix git authenticate")))
(option '(#\r "repository") #t #f
(lambda (opt name arg result)
(alist-cons 'directory arg result)))
(option '(#\e "end") #t #f
(lambda (opt name arg result)
(alist-cons 'end-commit (string->oid arg) result)))
(option '(#\k "keyring") #t #f
(lambda (opt name arg result)
(alist-cons 'keyring-reference arg result)))
(option '("cache-key") #t #f
(lambda (opt name arg result)
(alist-cons 'cache-key arg result)))
(option '("historical-authorizations") #t #f
(lambda (opt name arg result)
(alist-cons 'historical-authorizations arg
result)))
(option '("stats") #f #f
(lambda (opt name arg result)
(alist-cons 'show-stats? #t result)))))
(define %default-options
'((directory . ".")
(keyring-reference . "keyring")))
(define (show-stats stats)
"Display STATS, an alist containing commit signing stats as returned by
'authenticate-repository'."
(format #t (G_ "Signing statistics:~%"))
(for-each (match-lambda
((signer . count)
(format #t " ~a ~10d~%"
(openpgp-format-fingerprint
(openpgp-public-key-fingerprint signer))
count)))
(sort stats
(match-lambda*
(((_ . count1) (_ . count2))
(> count1 count2))))))
(define (show-help)
(display (G_ "Usage: guix git authenticate COMMIT SIGNER [OPTIONS...]
Authenticate the given Git checkout using COMMIT/SIGNER as its introduction.\n"))
(display (G_ "
-r, --repository=DIRECTORY
open the Git repository at DIRECTORY"))
(display (G_ "
-k, --keyring=REFERENCE
load keyring from REFERENCE, a Git branch"))
(display (G_ "
--stats display commit signing statistics upon completion"))
(display (G_ "
--cache-key=KEY cache authenticated commits under KEY"))
(display (G_ "
--historical-authorizations=FILE
read historical authorizations from FILE"))
(newline)
(display (G_ "
-h, --help display this help and exit"))
(display (G_ "
-V, --version display version information and exit"))
(newline)
(show-bug-report-information))
\f
;;;
;;; Entry point.
;;;
(define (guix-git-authenticate . args)
(define options
(parse-command-line args %options (list %default-options)
#:build-options? #f))
(define (command-line-arguments lst)
(reverse (filter-map (match-lambda
(('argument . arg) arg)
(_ #f))
lst)))
(define commit-short-id
(compose (cut string-take <> 7) oid->string commit-id))
(define (openpgp-fingerprint* str)
(unless (string-every (char-set-union char-set:hex-digit
char-set:whitespace)
str)
(leave (G_ "~a: invalid OpenPGP fingerprint~%") str))
(let ((fingerprint (openpgp-fingerprint str)))
(unless (= 20 (bytevector-length fingerprint))
(leave (G_ "~a: wrong length for OpenPGP fingerprint~%") str))
fingerprint))
(define (make-reporter start-commit end-commit commits)
(format (current-error-port)
(G_ "Authenticating commits ~a to ~a (~h new \
commits)...~%")
(commit-short-id start-commit)
(commit-short-id end-commit)
(length commits))
(if (isatty? (current-error-port))
(progress-reporter/bar (length commits))
progress-reporter/silent))
(with-error-handling
(with-git-error-handling
(match (command-line-arguments options)
((commit signer)
(let* ((directory (assoc-ref options 'directory))
(show-stats? (assoc-ref options 'show-stats?))
(keyring (assoc-ref options 'keyring-reference))
(repository (repository-open directory))
(end (match (assoc-ref options 'end-commit)
(#f (reference-target
(repository-head repository)))
(oid oid)))
(history (match (assoc-ref options 'historical-authorizations)
(#f '())
(file (call-with-input-file file
read-authorizations))))
(cache-key (or (assoc-ref options 'cache-key)
(repository-cache-key repository))))
(define stats
(authenticate-repository repository (string->oid commit)
(openpgp-fingerprint* signer)
#:end end
#:keyring-reference keyring
#:historical-authorizations history
#:cache-key cache-key
#:make-reporter make-reporter))
(when (and show-stats? (not (null? stats)))
(show-stats stats))))
(_
(leave (G_ "wrong number of arguments; \
expected COMMIT and SIGNER~%")))))))
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