;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2014 Sree Harsha Totakura <sreeharsha@totakura.in>
;;; Copyright © 2016 Jookia <166291@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 svn)
  #:use-module (guix build utils)
  #:use-module (ice-9 format)
  #:use-module (srfi srfi-2)
  #:use-module (web uri)
  #:use-module (web client)
  #:export (svn-fetch))

;;; Commentary:
;;;
;;; This is the build-side support code of (guix svn-download).  It allows a
;;; Subversion repository to be cloned and checked out at a specific revision.
;;;
;;; Code:

(define* (svn-fetch url revision directory
                    #:key (svn-command "svn"))
  "Fetch REVISION from URL into DIRECTORY.  REVISION must be an integer, and a
valid Subversion revision.  Return #t on success, #f otherwise."
  (define proxy-config
    (if (current-http-proxy)
      (and-let* ((proxy-uri  (string->uri (current-http-proxy)))
                 (proxy-host (uri-host proxy-uri))
                 (proxy-port (number->string (uri-port proxy-uri)))
                 (config-host "servers:global:http-proxy-host=")
                 (config-port "servers:global:http-proxy-port="))
        `("--config-option" ,(string-append config-host proxy-host)
          "--config-option" ,(string-append config-port proxy-port)))
      '()))

    (if proxy-config
        (and (zero? (apply system* (append
                      `(,svn-command "checkout")
                      proxy-config
                      `("--non-interactive"
                      ;; Trust the server certificate.  This is OK as we
                      ;; verify the checksum later.  This can be removed when
                      ;; ca-certificates package is added.
                      "--trust-server-cert" "-r" ,(number->string revision)
                      ,url ,directory))))
          (with-directory-excursion directory
            (begin
              ;; The contents of '.svn' vary as a function of the current status
              ;; of the repo.  Since we want a fixed output, this directory needs
              ;; to be taken out.
              (delete-file-recursively ".svn")
              #t)))
        (format (current-error-port)
              "Unable to parse current-http-proxy: ~s~%" (current-http-proxy))))

;;; svn.scm ends here