212 lines
7.4 KiB
Scheme
212 lines
7.4 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2012-2014, 2016-2017, 2020-2022 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org>
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;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
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;;; Copyright © 2018 Tim Gesthuizen <tim.gesthuizen@yahoo.de>
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;;; Copyright © 2021, 2023 Simon Tournier <zimon.toutoune@gmail.com>
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;;; Copyright © 2021 Sarah Morgensen <iskarian@mgsn.dev>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix scripts hash)
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#:use-module (gcrypt hash)
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#:use-module (guix ui)
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#:use-module (guix hash)
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#:use-module (guix scripts)
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#:use-module (guix base16)
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#:use-module (guix base32)
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#:autoload (guix base64) (base64-encode)
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#:use-module (ice-9 match)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-37)
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#:autoload (disarchive git-hash) (git-hash-file git-hash-directory)
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#:export (guix-hash))
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;;;
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;;; Serializers
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;;;
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(define* (nar-hash file #:optional
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(algorithm (assoc-ref %default-options 'hash-algorithm))
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select?)
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(file-hash* file #:algorithm algorithm #:select? select? #:recursive? #true))
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(define* (default-hash file #:optional
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(algorithm (assoc-ref %default-options 'hash-algorithm))
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select?)
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(match file
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("-" (port-hash algorithm (current-input-port)))
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(_ (file-hash* file #:algorithm algorithm #:recursive? #false))))
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(define* (git-hash file #:optional
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(algorithm (assoc-ref %default-options 'hash-algorithm))
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select?)
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(define directory?
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(case (stat:type (stat file))
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((directory) #t)
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(else #f)))
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(if directory?
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(git-hash-directory file algorithm #:select? select?)
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(git-hash-file file algorithm)))
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;;;
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;;; Command-line options.
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;;;
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(define %default-options
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;; Alist of default option values.
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`((format . ,bytevector->nix-base32-string)
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(hash-algorithm . ,(hash-algorithm sha256))
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(serializer . ,default-hash)))
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(define (show-help)
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(display (G_ "Usage: guix hash [OPTION] FILE
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Return the cryptographic hash of FILE.\n"))
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(newline)
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(display (G_ "\
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Supported formats: 'base64', 'nix-base32' (default), 'base32',
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and 'base16' ('hex' and 'hexadecimal' can be used as well).\n"))
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(format #t (G_ "
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-x, --exclude-vcs exclude version control directories"))
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(format #t (G_ "
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-H, --hash=ALGORITHM use the given hash ALGORITHM"))
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(format #t (G_ "
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-f, --format=FMT write the hash in the given format"))
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(format #t (G_ "
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-S, --serializer=TYPE compute the hash on FILE according to TYPE serialization"))
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(newline)
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(display (G_ "
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-h, --help display this help and exit"))
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(display (G_ "
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-V, --version display version information and exit"))
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(newline)
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(show-bug-report-information))
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(define %options
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;; Specification of the command-line options.
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(list (option '(#\x "exclude-vcs") #f #f
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(lambda (opt name arg result)
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(alist-cons 'exclude-vcs? #t result)))
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(option '(#\H "hash") #t #f
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(lambda (opt name arg result)
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(match (lookup-hash-algorithm (string->symbol arg))
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(#f
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(leave (G_ "~a: unknown hash algorithm~%") arg))
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(algo
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(alist-cons 'hash-algorithm algo result)))))
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(option '(#\f "format") #t #f
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(lambda (opt name arg result)
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(define fmt-proc
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(match arg
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("base64"
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base64-encode)
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("nix-base32"
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bytevector->nix-base32-string)
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("base32"
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bytevector->base32-string)
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((or "base16" "hex" "hexadecimal")
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bytevector->base16-string)
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(x
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(leave (G_ "unsupported hash format: ~a~%")
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arg))))
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(alist-cons 'format fmt-proc
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(alist-delete 'format result))))
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(option '(#\r "recursive") #f #f
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(lambda (opt name arg result)
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(unless (eqv? name #\r)
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(warning (G_ "'--recursive' is deprecated, \
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use '--serializer=nar' instead~%")))
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(alist-cons 'serializer nar-hash
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(alist-delete 'serializer result))))
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(option '(#\S "serializer") #t #f
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(lambda (opt name arg result)
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(define serializer-proc
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(match arg
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("none"
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default-hash)
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("nar"
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nar-hash)
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("git"
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git-hash)
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(x
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(leave (G_ "unsupported serializer type: ~a~%")
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arg))))
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(alist-cons 'serializer serializer-proc
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(alist-delete 'serializer result))))
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(option '(#\h "help") #f #f
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(lambda args
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(leave-on-EPIPE (show-help))
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(exit 0)))
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(option '(#\V "version") #f #f
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(lambda args
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(show-version-and-exit "guix hash")))))
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;;;
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;;; Entry point.
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;;;
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(define-command (guix-hash . args)
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(category packaging)
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(synopsis "compute the cryptographic hash of a file")
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(define (parse-options)
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;; Return the alist of option values.
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(parse-command-line args %options (list %default-options)
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#:build-options? #f))
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(let* ((opts (parse-options))
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(args (filter-map (match-lambda
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(('argument . value)
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value)
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(_ #f))
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(reverse opts)))
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(fmt (assq-ref opts 'format))
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(algorithm (assoc-ref opts 'hash-algorithm))
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(serializer (assoc-ref opts 'serializer)))
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(define (file-hash file)
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;; Compute the hash of FILE.
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;; Catch and gracefully report possible error
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(catch 'system-error
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(lambda _
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(with-error-handling
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(let ((select? (if (assq-ref opts 'exclude-vcs?)
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(negate (vcs-file-predicate file))
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(const #t))))
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(serializer file algorithm select?))))
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(lambda args
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(leave (G_ "~a ~a~%")
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file
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(strerror (system-error-errno args))))))
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(define (formatted-hash thing)
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(fmt (file-hash thing)))
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(match args
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(()
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(leave (G_ "no arguments specified~%")))
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(_
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(for-each
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(compose (cute format #t "~a~%" <>) formatted-hash)
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args)))))
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