;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2022 pukkamustard <pukkamustard@posteo.net>
;;;
;;; 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 eris)
  #:use-module (eris)

  #:use-module (guix config)
  #:use-module (guix eris fs-store)

  #:export (guix-eris-block-reducer
            call-with-eris-block-ref

            %eris-block-store-directory))

(define %eris-block-store-directory
  (make-parameter
   (or (getenv "GUIX_ERIS_BLOCK_STORE_DIRECTORY")
       (string-append %state-directory "/eris"))))

(define (guix-eris-block-reducer)
  "Returns a block reducer that stores blocks of ERIS encoded content."
  (eris-fs-store-reducer (%eris-block-store-directory)))

(define (call-with-eris-block-ref f)
  (let ((fs-store-block-ref
         (eris-fs-store-ref
          (%eris-block-store-directory))))
    (f fs-store-block-ref)))