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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016 David Craven <david@craven.ch>
;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2019 Ivan Petkov <ivanppetkov@gmail.com>
;;;
;;; 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 build cargo-utils)
#:use-module (guix build utils)
#:use-module (ice-9 popen)
#:use-module (ice-9 rdelim)
#:export (generate-checksums))
;; Commentary:
;;
;; Stand alone utilities for building Rust crates or the compiler itself,
;; without depending on the entire cargo build-system itself.
;;
;; Code:
(define (file-sha256 file-name)
"Calculate the hexdigest of the sha256 checksum of FILE-NAME and return it."
(let ((port (open-pipe* OPEN_READ
"sha256sum"
"--"
file-name)))
(let ((result (read-delimited " " port)))
(close-pipe port)
result)))
(define (generate-checksums dir-name)
"Given DIR-NAME, a store directory, checksum all the files in it one
by one and put the result into the file \".cargo-checksum.json\" in
the same directory."
(let* ((file-names (find-files dir-name "."))
(dir-prefix-name (string-append dir-name "/"))
(dir-prefix-name-len (string-length dir-prefix-name))
(checksums-file-name (string-append dir-name "/.cargo-checksum.json")))
(call-with-output-file checksums-file-name
(lambda (port)
(display "{\"files\":{" port)
(let ((sep ""))
(for-each (lambda (file-name)
(let ((file-relative-name (string-drop file-name dir-prefix-name-len)))
(display sep port)
(set! sep ",")
(write file-relative-name port)
(display ":" port)
(write (file-sha256 file-name) port))) file-names))
;; NB: cargo requires the "package" field in order to check if the Cargo.lock
;; file needs to be regenerated when the value changes. However, it doesn't
;; appear to care what the value is to begin with...
(display "},\"package\":" port)
(write (file-sha256 "/dev/null") port)
(display "}" port)))))
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