3140f2df42
* guix/scripts/hash.scm (show-help): Add --recursive. (%options): Likewise. (guix-hash)[file-hash]: New procedure. Honor --recursive. Use it. * guix/nar.scm (write-file): Add missing field to the &nar-error condition raised upon unsupported file type; change its message to be more descriptive. * tests/guix-hash.sh: Add tests with -r. * doc/guix.texi (Invoking guix hash): Document --recursive.
138 lines
4.5 KiB
Scheme
138 lines
4.5 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2012, 2013, 2014 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org>
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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 (guix base32)
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#:use-module (guix hash)
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#:use-module (guix nar)
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#:use-module (guix ui)
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#:use-module (guix utils)
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#:use-module (rnrs io ports)
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#:use-module (rnrs files)
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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-11)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-37)
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#:export (guix-hash))
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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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(define (show-help)
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(display (_ "Usage: guix hash [OPTION] FILE
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Return the cryptographic hash of FILE.
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Supported formats: 'nix-base32' (default), 'base32', and 'base16' ('hex'
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and 'hexadecimal' can be used as well).\n"))
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(format #t (_ "
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-f, --format=FMT write the hash in the given format"))
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(format #t (_ "
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-r, --recursive compute the hash on FILE recursively"))
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(newline)
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(display (_ "
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-h, --help display this help and exit"))
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(display (_ "
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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 '(#\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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("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 (_ "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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(alist-cons 'recursive? #t result)))
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(option '(#\h "help") #f #f
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(lambda args
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(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 (guix-hash . args)
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(define (parse-options)
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;; Return the alist of option values.
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(args-fold* args %options
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(lambda (opt name arg result)
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(leave (_ "unrecognized option: ~a~%")
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name))
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(lambda (arg result)
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(alist-cons 'argument arg result))
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%default-options))
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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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(define (file-hash file)
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;; Compute the hash of FILE.
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;; Catch and gracefully report possible '&nar-error' conditions.
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(with-error-handling
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(if (assoc-ref opts 'recursive?)
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(let-values (((port get-hash) (open-sha256-port)))
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(write-file file port)
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(flush-output-port port)
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(get-hash))
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(call-with-input-file file port-sha256))))
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(match args
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((file)
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(catch 'system-error
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(lambda ()
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(format #t "~a~%" (fmt (file-hash file))))
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(lambda args
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(leave (_ "~a~%")
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(strerror (system-error-errno args))))))
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(_
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(leave (_ "wrong number of arguments~%"))))))
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